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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2017	Oct. 24, 2017
Document and Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2017
Entity Registrant Name	PRICE T ROWE GROUP INC
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding (shares)		242,310,036
Entity Central Index Key	0001113169
Amendment Flag	false

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 1,869.4	$ 1,204.9
Accounts receivable and accrued revenue	507.9	455.1
Investments	1,359.3	1,257.5
Assets of consolidated sponsored investment portfolios ($1,446.1 million at December 31, 2016, and $1,845.5 million at September 30, 2017, related to variable interest entities)	2,082.1	1,680.5
Property and equipment, net	635.0	615.1
Goodwill	665.7	665.7
Other assets	260.2	346.2
Total assets	7,379.6	6,225.0
LIABILITIES
Accounts payable and accrued expenses	193.5	180.8
Liabilities of consolidated sponsored investment portfolios ($56.8 million at December 31, 2016, and $43.3 million at September 30, 2017, related to variable interest entities)	53.8	65.6
Accrued compensation and related costs	453.8	92.6
Supplemental savings plan liability	179.9	150.9
Income taxes payable	16.8	39.3
Total liabilities	897.8	529.2
Commitments and contingent liabilities
Redeemable non-controlling interests	953.8	687.2
STOCKHOLDERS’ EQUITY
Preferred stock, undesignated, $.20 par value – authorized and unissued 20,000,000 shares	0.0	0.0
Common stock, $.20 par value—authorized 750,000,000; issued 244,784,000 shares at December 31, 2016, and 242,214,000 at September 30, 2017	48.4	49.0
Additional capital in excess of par value	751.9	654.5
Retained earnings	4,728.2	4,293.6
Accumulated other comprehensive income (loss)	(0.5)	11.5
Total permanent stockholders’ equity	5,528.0	5,008.6
Total liabilities, redeemable non-controlling interests, and permanent stockholders’ equity	$ 7,379.6	$ 6,225.0

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Assets of consolidated sponsored investment portfolios	$ 2,082.1	$ 1,680.5
Liabilities of consolidated sponsored investment portfolios	$ 53.8	$ 65.6
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.2	$ 0.2
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, par value (in dollars per share)	$ 0.2	$ 0.2
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares outstanding (in shares)	242,214,000	244,784,000
Common stock, shares issued (in shares)	242,214,000	244,784,000
Variable interest entities [Member]
Assets of consolidated sponsored investment portfolios	$ 1,845.5	$ 1,446.1
Liabilities of consolidated sponsored investment portfolios	$ 43.3	$ 56.8

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Revenues

Investment advisory fees

$ 1,096.7

$ 970.5

$ 3,131.7

$ 2,761.9

Administrative fees

87.6

85.7

266.2

263.6

Distribution and servicing fees

37.4

36.7

109.0

106.2

Net revenues

1,221.7

1,092.9

3,506.9

3,131.7

Operating expenses

Compensation and related costs

417.4

386.2

1,218.6

1,112.4

Advertising and promotion

14.0

14.7

58.2

52.7

Distribution and servicing costs

37.4

36.7

109.0

106.2

Depreciation and amortization of property and equipment

35.0

34.0

106.9

^[1]

100.0

^[1]

Occupancy and facility costs

49.0

45.3

141.2

127.5

Other operating expenses

120.4

100.3

345.2

296.6

Nonrecurring charge (insurance recoveries) related to Dell appraisal rights matter

0.0

(50.0)

166.2

Total operating expenses

673.2

617.2

1,929.1

1,961.6

Net operating income

548.5

475.7

1,577.8

1,170.1

Non-operating income

Net investment income on investments

28.9

14.5

165.1

91.1

Net investment income on consolidated sponsored investment portfolios

37.5

73.8

125.8

124.0

Other income (expense)

0.9

0.0

3.4

(0.2)

Total non-operating income

67.3

88.3

294.3

214.9

Income before income taxes

615.8

564.0

1,872.1

1,385.0

Provision for income taxes

211.6

201.3

677.5

497.8

Net income

404.2

362.7

1,194.6

^[1]

887.2

^[1]

Less: net income attributable to redeemable non-controlling interests

13.3

34.9

43.9

52.0

Net income attributable to T. Rowe Price Group

$ 390.9

$ 327.8

$ 1,150.7

$ 835.2

Earnings per share on common stock of T. Rowe Price Group

Basic (in dollars per share)

$ 1.59

$ 1.30

$ 4.67

$ 3.32

Diluted (in dollars per share)

1.56

1.28

4.60

3.25

Dividends declared per share (in dollars per share)

$ 0.57

$ 0.54

$ 1.71

$ 1.62

[1]	See note 12 for a supplementary consolidating cash flow schedule.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Net income

$ 404.2

$ 362.7

$ 1,194.6

^[1]

$ 887.2

^[1]

Other comprehensive income (loss)

Net unrealized holding gains on available-for-sale investments

4.9

10.3

37.1

9.4

Reclassification adjustments recognized in non-operating income: Net gains realized on dispositions determined using average cost

(0.1)

0.0

(78.0)

(52.3)

Reclassification adjustments recognized in non-operating income: Net unrealized gains recognized upon the transfer to trading investments

0.0

(23.6)

0.0

Total net unrealized holding gains (losses) recognized in other comprehensive income

4.8

10.3

(64.5)

(42.9)

Currency translation adjustments

17.6

13.0

58.1

26.2

Other comprehensive income (loss) before income taxes

22.4

23.3

(6.4)

(16.7)

Net deferred tax benefits (income taxes)

(7.1)

(4.7)

8.2

13.5

Total other comprehensive income (loss)

15.3

18.6

1.8

(3.2)

Total comprehensive income

419.5

381.3

1,196.4

884.0

Less: comprehensive income attributable to redeemable non-controlling interests

17.5

46.5

57.7

69.6

Comprehensive income attributable to T. Rowe Price Group

402.0

334.8

1,138.7

814.4

Variable interest entities [Member]

Other comprehensive income (loss)

Consolidated sponsored investment portfolios - variable interest entities

16.7

16.8

53.7

30.8

Reclassification gain recognized in non-operating investment income upon deconsolidation of sponsored fund subsidiary

(0.1)

(1.1)

(0.1)

(1.1)

Currency translation adjustments

16.6

15.7

53.6

29.7

Equity method investments [Member]

Other comprehensive income (loss)

Currency translation adjustments

$ 1.0

$ (2.7)

$ 4.5

$ (3.5)

[1]	See note 12 for a supplementary consolidating cash flow schedule.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Cash flows from operating activities

Net income

^[1]

$ 1,194.6

$ 887.2

Adjustments to reconcile net income to net cash provided by (used in) operating activities

Depreciation and amortization of property and equipment

^[1]

106.9

100.0

Stock-based compensation expense

^[1]

110.6

117.9

Realized gains on dispositions of available-for-sale sponsored investment portfolios

^[1]

(78.0)

(52.3)

Gains recognized upon transfer of an available-for-sale sponsored investment portfolio to sponsored investment portfolios held as trading

^[1]

(23.6)

0.0

Net gains recognized on other investments

^[1]

(40.4)

(28.1)

Investments in sponsored investment portfolios held as trading to economically hedge supplemental savings plan liability

^[1]

(129.0)

0.0

Net change in trading securities held by consolidated sponsored investment portfolios

^[1]

(1,210.5)

(1,084.1)

Other changes in assets and liabilities

^[1]

422.2

327.6

Net cash provided by (used in) operating activities

^[1]

352.8

268.2

Cash flows from investing activities

Purchases of available-for-sale sponsored investment portfolios

^[1]

(16.0)

(0.1)

Dispositions of available-for-sale sponsored investment portfolios

^[1]

294.0

89.2

Net cash of sponsored investment portfolios on consolidation (deconsolidation)

^[1]

(46.0)

54.3

Additions to property and equipment

^[1]

(129.1)

(112.5)

Other investing activity

^[1]

(27.5)

79.4

Net cash provided by (used in) investing activities

^[1]

75.4

110.3

Cash flows from financing activities

Repurchases of common stock

^[1]

(456.7)

(525.7)

Common share issuances under stock-based compensation plans

^[1]

142.8

88.8

Dividends paid to common stockholders of T. Rowe Price Group

^[1]

(420.8)

(406.6)

Net subscriptions received from redeemable non-controlling interest holders

^[1]

1,005.3

798.2

Net cash provided by (used in) financing activities

^[1]

270.6

(45.3)

Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios

^[1]

6.9

(18.2)

Net change in cash and cash equivalents during period

^[1]

705.7

315.0

Cash and cash equivalents at beginning of year

^[1]

1,270.5

1,172.3

Cash and cash equivalents at end of period

^[1]

$ 1,976.2

$ 1,487.3

[1]	See note 12 for a supplementary consolidating cash flow schedule.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Cash and cash equivalents	$ 1,869.4	$ 1,204.9
Consolidated sponsored investment portfolios [Member]
Cash and cash equivalents	$ 106.8		$ 86.3

UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 2017 - USD ($) shares in Thousands, $ in Millions	Total	Common stock [Member]	Additional capital in excess of par value [Member]	Retained earnings [Member]	Accumulated other comprehensive income (loss) [Member]	Restricted shares [Member]	Restricted shares [Member] Common stock [Member]	Restricted shares [Member] Additional capital in excess of par value [Member]	Restricted stock units [Member]	Restricted stock units [Member] Common stock [Member]	Restricted stock units [Member] Additional capital in excess of par value [Member]
Balances (in shares) at Dec. 31, 2016		244,784
Balances at Dec. 31, 2016	$ 5,008.6	$ 49.0	$ 654.5	$ 4,293.6	$ 11.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,150.7			1,150.7
Other comprehensive income (loss), net of tax	(12.0)				(12.0)
Dividends declared	(420.3)			(420.3)
Common stock-based compensation plans activity
Shares issued upon option exercises (shares)		4,001
Shares issued upon option exercises	148.3	$ 0.8	147.5
Shares issued, net of shares withheld for taxes (shares)							15			24
Shares issued, net of shares withheld for taxes						$ (0.1)	$ 0.0	$ (0.1)	$ (1.1)	$ 0.0	$ (1.1)
Forfeiture of restricted awards (shares)		(13)
Forfeiture of restricted awards	0.0	$ 0.0
Stock-based compensation expense	110.6		110.6
Restricted stock units issued as dividend equivalents	0.0		0.1	(0.1)
Common shares repurchased (shares)		(6,597)
Common shares repurchased	(456.7)	$ (1.4)	(159.6)	(295.7)
Balances (in shares) at Sep. 30, 2017		242,214
Balances at Sep. 30, 2017	5,528.0	$ 48.4	$ 751.9	$ 4,728.2	$ (0.5)
Beginning balances attributable to redeemable non-controlling interests at Dec. 31, 2016	687.2
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to redeemable non-controlling interests	43.9
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests	13.8
Net subscriptions into sponsored investment portfolios	988.2
Net deconsolidations of sponsored investment portfolios	(779.3)
Ending balances attributable to redeemable non-controlling interests at Sep. 30, 2017	$ 953.8

THE COMPANY AND BASIS OF PREPARATION.	9 Months Ended
THE COMPANY AND BASIS OF PREPARATION.	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
THE COMPANY AND BASIS OF PREPARATION	THE COMPANY AND BASIS OF PREPARATION. T. Rowe Price Group (Price Group) derives its consolidated revenues and net income primarily from investment advisory services that its subsidiaries provide to individual and institutional investors in the sponsored T. Rowe Price U.S. mutual funds and other investment portfolios, including separately managed accounts, subadvised funds, and other sponsored investment portfolios. We also provide our investment advisory clients with related administrative services, including distribution, mutual fund transfer agent, accounting, and shareholder services; participant recordkeeping and transfer agent services for defined contribution retirement plans; brokerage; and trust services. Investment advisory revenues depend largely on the total value and composition of assets under our management. Accordingly, fluctuations in financial markets and in the composition of assets under management impact our revenues and results of operations. These unaudited condensed consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States, which require the use of estimates and reflect all adjustments that are, in the opinion of management, necessary to a fair statement of our results for the interim periods presented. All such adjustments are of a normal recurring nature. Actual results may vary from our estimates. Certain prior year amounts have been reclassified to conform to the 2017 presentation. The unaudited interim financial information contained in these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements contained in our 2016 Annual Report.

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES.

9 Months Ended

Sep. 30, 2017

Information about Receivables, Revenues, and Services [Abstract]

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES.

Accounts receivable from our sponsored investment portfolios, including our U.S. mutual funds, for advisory fees and advisory-related administrative services aggregate $303.1 million at December 31, 2016, and $332.4 million at September 30, 2017.

Revenues (in millions) from advisory services provided under agreements with our sponsored U.S. mutual funds and other investment clients include:



	Three months ended				Nine months ended
	9/30/2016		9/30/2017		9/30/2016		9/30/2017
Sponsored U.S. mutual funds
Stock and blended asset	$	579.3	$	656.8	$	1,649.9	$	1,879.5
Bond and money market	124.2		127.1		354.8		374.5
	703.5		783.9		2,004.7		2,254.0
Other investment portfolios
Stock and blended asset	222.2		259.6		630.4		727.8
Bond, money market, and stable value	44.8		53.2		126.8		149.9
	267.0		312.8		757.2		877.7
Total	$	970.5	$	1,096.7	$	2,761.9	$	3,131.7

Other investment portfolios include advisory revenues of $101.1 million and $125.1 million for the three months ended September 30, 2016 and 2017, respectively, that were earned from other sponsored investment portfolios. Fees earned during the nine months ended September 30, 2016 and 2017, total $283.3 million and $339.8 million respectively.

We voluntarily waived $2.1 million and $9.4 million in money market related fees, including advisory fees and fund expenses, during the three and nine months ended September 30, 2016, respectively, in order to maintain a positive yield for investors. We did not waive any money market related fees during 2017.

The following table summarizes the investment portfolios and assets under management (in billions) on which we earn advisory fees.



	Average during				Average during
	the third quarter of				the first nine months of
	2016		2017		2016		2017
Sponsored U.S. mutual funds
Stock and blended asset	$	399.3	$	452.9	$	381.5	$	438.2
Bond and money market	112.0		123.2		108.2		119.6
	511.3		576.1		489.7		557.8
Other investment portfolios
Stock and blended asset	218.2		264.6		208.2		247.0
Bond, money market, and stable value	74.1		86.7		70.4		81.5
	292.3		351.3		278.6		328.5
Total	$	803.6	$	927.4	$	768.3	$	886.3

					As of
					12/31/2016		9/30/2017
Sponsored U.S. mutual funds
Stock and blended asset					$	401.3	$	461.9
Bond and money market					112.9		123.4
					514.2		585.3
Other investment portfolios
Stock and blended asset					220.8		273.1
Bond, money market, and stable value					75.8		89.5
					296.6		362.6
Total					$	810.8	$	947.9

Investors that we serve are primarily domiciled in the U.S.; investment advisory clients outside the U.S. account for 4.7% and 5.4% of our assets under management at December 31, 2016, and September 30, 2017, respectively.

The following table summarizes other fees (in millions) we earn from our sponsored U.S. mutual funds.



	Three months ended				Nine months ended
	9/30/2016		9/30/2017		9/30/2016		9/30/2017
Administrative fees	$	66.6	$	69.2	$	208.6	$	210.6
Distribution and servicing fees	$	36.7	$	37.4	$	106.2	$	109.0

INVESTMENTS.

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

INVESTMENTS

INVESTMENTS.

The carrying values of investments (in millions) we do not consolidate are as follows:



	12/31/2016		9/30/2017
Available-for-sale sponsored investment portfolios	$	709.0	$	573.0
Equity method investments
Sponsored investment portfolios	252.3		287.7
26% interest in UTI Asset Management Company Limited (India)	140.9		154.6
Investment partnerships	5.3		4.9
Trading investments
Sponsored investment portfolios designated as economic hedge of supplemental savings plan liability	—		178.4
Other sponsored investment portfolios	75.4		82.3
Cost method investments	73.6		77.4
U.S. Treasury note	1.0		1.0
Total	$	1,257.5	$	1,359.3

At the end of the second quarter 2017, we made the decision to economically hedge the market exposure associated with our supplemental savings plan liability with certain sponsored investment portfolios. In order to fund the hedge portfolio, we used the proceeds from the sale of certain available-for-sale sponsored investment holdings as well as designated a sponsored fund that was held as available-for-sale.

During the first nine months of 2016 and 2017, certain sponsored investment portfolios in which we provided initial seed capital at the time of formation were deconsolidated, as we no longer had a controlling interest. Additionally, during the first nine months of 2016 and 2017, certain sponsored investment portfolios that were being accounted for as equity method investments were consolidated, as we regained a controlling interest. The net impact of these changes on our condensed consolidated balance sheets and income statements as of the dates the portfolios were deconsolidated or reconsolidated is detailed below.



	Three months ended					Nine months ended
	9/30/2016			9/30/2017		9/30/2016			9/30/2017
Net increase (decrease) in assets of consolidated sponsored investment portfolios	$	(315.1	)	$	13.5	$	(678.3	)	$	(1,060.5	)
Net increase (decrease) in liabilities of consolidated sponsored investment portfolios	$	(28.8	)	$	—	$	(31.0	)	$	(133.6	)
Net increase (decrease) in redeemable non-controlling interests	$	(237.3	)	$	7.9	$	(398.6	)	$	(779.3	)

Gain recognized upon deconsolidation	$	1.1		$	.1	$	1.1		$	.1

The gains recognized upon deconsolidation were the result of reclassifying currency translation adjustments accumulated on investment portfolios’ with non-USD functional currencies from accumulated other comprehensive income to non-operating income. Depending on our ownership interest, we are now reporting our residual interests in these sponsored investment portfolios as either an equity method or available-for-sale investment.

AVAILABLE-FOR-SALE SPONSORED INVESTMENT PORTFOLIOS.

The available-for-sale sponsored investment portfolios (in millions) include:



	Aggregate cost		Unrealized holding					Aggregate fair value
	Aggregate cost		gains		losses			Aggregate fair value
December 31, 2016
Stock and blended asset funds	$	162.9	$	88.0	$	(1.9	)	$	249.0
Bond funds	463.3		1.7		(5.0		)	460.0
Total	$	626.2	$	89.7	$	(6.9	)	$	709.0

September 30, 2017
Stock and blended asset funds	$	118.8	$	16.5	$	—		$	135.3
Bond funds	436.3		4.3		(2.9		)	437.7
Total	$	555.1	$	20.8	$	(2.9	)	$	573.0

The following table details the number of holdings, the unrealized holding losses, and the aggregate fair value of available-for-sale sponsored investment portfolios with unrealized losses categorized by the length of time they have been in a continuous unrealized loss position:



	Number of holdings	Unrealized holding losses			Aggregate fair value
December 31, 2016
Less than 12 months	8	$	(4.2	)	$	328.1
12 months or more	2	(2.7		)	169.5
Total	10	$	(6.9	)	$	497.6

September 30, 2017
Less than 12 months	2	$	(.7	)	$	24.5
12 months or more	1	(2.2		)	168.3
Total	3	$	(2.9	)	$	192.8

In addition to the duration of the impairments, we reviewed the severity of the impairment as well as our intent and ability to hold the investments for a period of time sufficient for an anticipated recovery in fair value. Accordingly, impairment of these investment holdings is considered temporary at December 31, 2016 and September 30, 2017.

VARIABLE INTEREST ENTITIES.

Our investments at December 31, 2016 and September 30, 2017, include interests in variable interest entities that we do not consolidate as we are not deemed the primary beneficiary. Our maximum risk of loss (in millions) related to our involvement with these entities is as follows:



	12/31/2016		9/30/2017
Investment carrying values	$	149.2	$	132.9
Unfunded capital commitments	46.4		43.3
Uncollected investment advisory and administrative fees	5.9		6.4
	$	201.5	$	182.6

The unfunded capital commitments totaling $43.3 million relate primarily to investment partnerships in which we have an existing investment. In addition to such amounts, a percentage of prior distributions may be called under certain circumstances.

FAIR VALUE MEASUREMENTS.

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS.

We determine the fair value of our cash equivalents and certain investments using the following broad levels of inputs as defined by related accounting standards:

Level 1 – quoted prices in active markets for identical securities.

Level 2 – observable inputs other than Level 1 quoted prices including, but not limited to, quoted prices for similar securities, interest rates, prepayment speeds, and credit risk. These inputs are based on market data obtained from independent sources.

Level 3 – unobservable inputs reflecting our own assumptions based on the best information available. We do not value any investments using Level 3 inputs.

These levels are not necessarily an indication of the risk or liquidity associated with our investments. There have been no transfers between the levels. The following table summarizes our investments (in millions) that are recognized in our condensed consolidated balance sheets using fair value measurements determined based on the differing levels of inputs.



	Level 1		Level 2
December 31, 2016
Cash equivalents	$	1,052.3	$	—
Available-for-sale sponsored investment portfolios	709.0		—
Sponsored investment portfolios held as trading	60.3		15.1
Total	$	1,821.6	$	15.1

September 30, 2017
Cash equivalents	$	1,606.3	$	—
Available-for-sale sponsored investment portfolios	573.0		—
Sponsored investment portfolios held as trading	242.9		17.8
Total	$	2,422.2	$	17.8

The table above excludes investments held by consolidated sponsored investment portfolios which are presented separately on our condensed consolidated balance sheets and are detailed in Note 5.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

CONSOLIDATED SPONSORED INVESTMENT PORTFOLIOS.

9 Months Ended

Sep. 30, 2017

Consolidated Sponsored Investment Portfolios [Abstract]

CONSOLIDATED SPONSORED INVESTMENT PORTFOLIOS

CONSOLIDATED SPONSORED INVESTMENT PORTFOLIOS.

The sponsored investment portfolios that we consolidate in our condensed consolidated financial statements are generally those products we provided initial seed capital at the time of their formation and have a controlling interest. Our U.S. sponsored investment portfolios are considered voting interest entities, while those regulated outside the U.S. are considered variable interest entities.

The following table details the net assets of the consolidated sponsored investment portfolios:



	December 31, 2016						September 30, 2017
	Voting interest entities		Variable interest entities		Total		Voting interest entities		Variable interest entities		Total
Cash and cash equivalents⁽¹⁾	$	10.3	$	55.3	$	65.6	$	9.5	$	97.3	$	106.8
Investments⁽²⁾	219.3		1,340.6		1,559.9		220.7		1,720.0		1,940.7
Other assets	4.8		50.2		55.0		6.4		28.2		34.6
Total assets	234.4		1,446.1		1,680.5		236.6		1,845.5		2,082.1
Liabilities	8.8		56.8		65.6		10.5		43.3		53.8
Net assets	$	225.6	$	1,389.3	$	1,614.9	$	226.1	$	1,802.2	$	2,028.3

Attributable to T. Rowe Price Group	$	156.1	$	771.6	$	927.7	$	165.7	$	908.8	$	1,074.5
Attributable to redeemable non-controlling interests	69.5		617.7		687.2		60.4		893.4		953.8
	$	225.6	$	1,389.3	$	1,614.9	$	226.1	$	1,802.2	$	2,028.3

⁽¹⁾Cash and cash equivalents includes $8.8 million and $8.2 million at December 31, 2016 and September 30, 2017, respectively, of investments in sponsored money market mutual funds that are considered related parties.

⁽²⁾Investments includes $4.2 million and $14.4 million at December 31, 2016 and September 30, 2017, respectively, of investments in sponsored portfolios that are considered related parties.

Although we can redeem our net interest in these sponsored investment portfolios at any time, we cannot directly access or sell the assets held by the portfolios to obtain cash for general operations. Additionally, the assets of these investment portfolios are not available to our general creditors.

Since third party investors in these investment funds have no recourse to our credit, our overall risk related to the net assets of consolidated sponsored investment portfolios is limited to valuation changes associated with our net interest. We, however, are required to recognize the valuation changes associated with all underlying investments held by these portfolios in our condensed consolidated statements of income, and disclose the portion attributable to third party investors as net income attributable to redeemable non-controlling interests.

The operating results (in millions) of the consolidated sponsored investment portfolios for the three- and nine- months ended September 30, 2016 and 2017, are reflected in our condensed consolidated statements of income as follows:



	Three months ended
	9/30/2016									9/30/2017
	Voting interest entities			Variable interest entities			Total			Voting interest entities			Variable interest entities			Total
Operating expenses reflected in net operating income	$	(.4	)	$	(3.4	)	$	(3.8	)	$	(.4	)	$	(2.8	)	$	(3.2	)
Net investment income reflected in non-operating income	8.7			65.1			73.8			4.6			32.9			37.5
Impact on income before taxes	$	8.3		$	61.7		$	70.0		$	4.2		$	30.1		$	34.3

Net income attributable to T. Rowe Price Group	$	6.2		$	28.9		$	35.1		$	3.1		$	17.9		$	21.0
Net income attributable to redeemable non-controlling interests	2.1			32.8			34.9			1.1			12.2			13.3
	$	8.3		$	61.7		$	70.0		$	4.2		$	30.1		$	34.3



	Nine months ended
	9/30/2016									9/30/2017
	Voting interest entities			Variable interest entities			Total			Voting interest entities			Variable interest entities			Total
Operating expenses reflected in net operating income	$	(1.2	)	$	(8.7	)	$	(9.9	)	$	(.9	)	$	(7.6	)	$	(8.5	)
Net investment income reflected in non-operating income	20.8			103.2			124.0			14.7			111.1			125.8
Impact on income before taxes	$	19.6		$	94.5		$	114.1		$	13.8		$	103.5		$	117.3

Net income attributable to T. Rowe Price Group	$	13.9		$	48.2		$	62.1		$	10.4		$	63.0		$	73.4
Net income attributable to redeemable non-controlling interests	5.7			46.3			52.0			3.4			40.5			43.9
	$	19.6		$	94.5		$	114.1		$	13.8		$	103.5		$	117.3

The operating expenses of these consolidated portfolios are reflected in other operating expenses. In preparing our condensed consolidated financial statements, we eliminated operating expenses of $2.2 million and $1.4 million for the three months ended September 30, 2016 and 2017, respectively, against the investment advisory and administrative fees earned from these portfolios. Operating expenses eliminated for the nine months ended September 30, 2016 and 2017, were $5.3 million and $3.2 million, respectively. The net investment income reflected in non-operating income includes dividend and interest income and realized and unrealized gains and losses on the underlying securities held by the consolidated sponsored investment portfolios.

The table below details the impact of these consolidated investment portfolios on the individual lines of our condensed consolidated statements of cash flows (in millions) for the nine months ended September 30, 2016 and 2017.



	Nine months ended
	September 30, 2016									September 30, 2017
	Voting interest entities			Variable interest entities			Total			Voting interest entities			Variable interest entities			Total
Net cash provided by (used in) operating activities	$	(48.0	)	$	(915.1	)	$	(963.1	)	$	(28.0	)	$	(1,078.1	)	$	(1,106.1	)
Net cash provided by (used in) investing activities	22.2			32.1			54.3			(6.1		)	(39.9		)	(46.0		)
Net cash provided by (used in) financing activities	38.4			974.9			1,013.3			33.3			1,153.1			1,186.4
Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios	—			(18.2		)	(18.2		)	—			6.9			6.9
Net change in cash and cash equivalents during period	12.6			73.7			86.3			(.8		)	42.0			41.2
Cash and cash equivalents at beginning of year	—			—			—			10.3			55.3			65.6
Cash and cash equivalents at end of period	$	12.6		$	73.7		$	86.3		$	9.5		$	97.3		$	106.8

The net cash provided by financing activities during the first nine months of 2016 and 2017 includes $215.1 million and $181.1 million, respectively, of net subscriptions we made into the consolidated sponsored investment portfolios, net of dividends received. These cash flows were eliminated in consolidation.

FAIR VALUE MEASUREMENTS.

We determine the fair value of investments held by consolidated sponsored investment portfolios using the following broad levels of inputs as defined by related accounting standards:

Level 1 – quoted prices in active markets for identical securities.

Level 3 – unobservable inputs reflecting our own assumptions based on the best information available. The value of investments using Level 3 inputs is insignificant.

These levels are not necessarily an indication of the risk or liquidity associated with these investment holdings. There have been no material transfers between the levels. The following table summarizes the investment holdings held by our consolidated sponsored investment portfolios (in millions) using fair value measurements determined based on the differing levels of inputs.



	Level 1			Level 2
December 31, 2016
Assets
Cash equivalents	$	8.8		$	.8
Equity securities	281.8			325.3
Fixed income securities	—			918.1
Other investments	.4			34.3
	$	291.0		$	1,278.5

Liabilities	$	(.6	)	$	(13.6	)

September 30, 2017
Assets
Cash equivalents	$	8.2		$	1.1
Equity securities	511.4			508.6
Fixed income securities	—			895.4
Other investments	2.0			23.3
	$	521.6		$	1,428.4

Liabilities	$	(.5	)	$	(14.5	)

STOCKHOLDERS' EQUITY.	9 Months Ended
STOCKHOLDERS' EQUITY.	Sep. 30, 2017
Stockholders' Equity Note [Abstract]
STOCKHOLDERS’ EQUITY	STOCKHOLDERS’ EQUITY. Regular cash dividends declared per share during the first nine months of 2016 and 2017 were $1.62 and $1.71, respectively.

STOCK-BASED COMPENSATION.

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION.

STOCK OPTIONS.

The following table summarizes the status of, and changes in, our stock options during the first nine months of 2017.



	Options		Weighted- average exercise price
Outstanding at December 31, 2016	24,364,322		$	61.90
Exercised	(5,803,025	)	$	50.09
Forfeited	(66,936	)	$	74.41
Expired	(39,631	)	$	76.06
Outstanding at September 30, 2017	18,454,730		$	65.54
Exercisable at September 30, 2017	11,731,672		$	60.65

RESTRICTED SHARES AND STOCK UNITS.

The following table summarizes the status of, and changes in, our nonvested restricted shares and restricted stock units during the first nine months of 2017.



	Restricted shares		Restricted stock units		Weighted-average fair value
Nonvested at December 31, 2016	931,508		4,634,461		$	72.19
Time-based grants	17,022		78,484		$	69.60
Vested	(10,717	)	(48,319	)	$	71.73
Forfeited	(13,007	)	(50,996	)	$	72.84
Nonvested at September 30, 2017	924,806		4,613,630		$	72.15

Nonvested at September 30, 2017, includes 14,400 performance-based restricted shares and 401,138 performance-based restricted stock units. The performance period has lapsed and the performance threshold has been met for all nonvested performance-based restricted shares and units as of September 30, 2017.

FUTURE STOCK-BASED COMPENSATION EXPENSE.

The following table presents the compensation expense (in millions) to be recognized over the remaining vesting periods of the stock-based awards outstanding at September 30, 2017. Estimated future compensation expense will change to reflect future grants of restricted stock awards and units, future option grants, changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.



Fourth quarter 2017	$	34.3
2018	86.3
2019 through 2022	73.1
Total	$	193.7

EARNINGS PER SHARE CALCULATIONS.

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

EARNINGS PER SHARE CALCULATIONS

EARNINGS PER SHARE CALCULATIONS.

The following table presents the reconciliation (in millions) of net income attributable to T. Rowe Price Group to net income allocated to our common stockholders and the weighted-average shares (in millions) that are used in calculating the basic and diluted earnings per share on our common stock. Weighted-average common shares outstanding assuming dilution reflect the potential dilution, determined using the treasury stock method, that could occur if outstanding stock options were exercised and non-participating stock awards vested.



	Three months ended				Nine months ended
	9/30/2016		9/30/2017		9/30/2016		9/30/2017
Net income attributable to T. Rowe Price Group	$	327.8	$	390.9	$	835.2	$	1,150.7
Less: net income allocated to outstanding restricted stock and stock unit holders	7.3		8.8		17.1		26.0
Net income allocated to common stockholders	$	320.5	$	382.1	$	818.1	$	1,124.7

Weighted-average common shares
Outstanding	245.6		240.3		246.4		240.7
Outstanding assuming dilution	250.1		244.4		251.5		244.3

The following table shows the weighted-average outstanding stock options (in millions) that are excluded from the calculation of diluted earnings per common share as the inclusion of such shares would be anti-dilutive.



	Three months ended		Nine months ended
	9/30/2016	9/30/2017	9/30/2016	9/30/2017
Weighted-average outstanding stock options excluded	10.3	2.1	9.9	6.7

OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME.

9 Months Ended

Sep. 30, 2017

Stockholders' Equity Note [Abstract]

OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME

OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME.

The following table presents the impact of the components (in millions) of other comprehensive income or loss on deferred tax benefits (income taxes).



	Three months ended						Nine months ended
	9/30/2016			9/30/2017			9/30/2016			9/30/2017
Net deferred tax benefits (income taxes) on:
Net unrealized holding gains or losses	$	(4.0	)	$	(1.9	)	$	(3.6	)	$	(14.4	)
Reclassification adjustments recognized in the provision for income taxes:
Net gains realized on dispositions	—			—			20.6			30.5
Net gains recognized upon transfer to trading investments	—			—			—			9.2
Net deferred tax benefits (income taxes) on net unrealized holding gains or losses	(4.0		)	(1.9		)	17.0			25.3
Currency translation adjustments	(1.1		)	(5.2		)	(3.9		)	(17.1		)
Reclassification adjustment recognized in the provision for income taxes upon deconsolidation of sponsored fund subsidiary	.4			—			.4			—
Total deferred tax benefits (income taxes) on currency translation adjustments	(.7		)	(5.2		)	(3.5		)	(17.1		)
Total net deferred tax benefits (income taxes)	$	(4.7	)	$	(7.1	)	$	13.5		$	8.2

The changes (in millions) in each component of accumulated other comprehensive income (loss), including reclassification adjustments for the first nine months of 2017 are presented in the table below.



				Currency translation adjustments
	Net unrealized holding gains			Equity method investments			Consolidated sponsored investment portfolios - variable interest entities			Total currency translation adjustments			Total
Balances at December 31, 2016	$	52.2		$	(32.3	)	$	(8.4	)	$	(40.7	)	$	11.5
Other comprehensive income before reclassifications and income taxes	37.1			4.5			39.9			44.4			81.5
Reclassification adjustments recognized in non-operating income	(101.6		)	—			(.1		)	(.1		)	(101.7		)
	(64.5		)	4.5			39.8			44.3			(20.2		)
Net deferred tax benefits (income taxes)	25.3			(1.6		)	(15.5		)	(17.1		)	8.2
Other comprehensive income (loss)	(39.2		)	2.9			24.3			27.2			(12.0		)
Balances at September 30, 2017	$	13.0		$	(29.4	)	$	15.9		$	(13.5	)	$	(.5	)

DELL APPRAISAL RIGHTS MATTER.	9 Months Ended
DELL APPRAISAL RIGHTS MATTER.	Sep. 30, 2017
Unusual or Infrequent Items, or Both [Abstract]
DELL APPRAISAL RIGHTS MATTER	DELL APPRAISAL RIGHTS MATTER. In 2016, we paid $166.2 million to compensate certain T. Rowe Price mutual funds, trusts, separately managed accounts, and subadvised clients (collectively, Clients) for the denial of their appraisal rights by the Delaware Chancery Court (Court) in connection with the 2013 leveraged buyout of Dell, Inc. (Dell). The Court ruled on May 11, 2016, that the Clients could not pursue an appraisal of any shares they held that were voted in favor of the Dell merger. The appraisal statute governing the transaction required the record holder to vote against or abstain from voting on the transaction in order to assert appraisal rights. After previously voting against prior transaction proposals, the voting instructions submitted on behalf of the Clients in connection with voting on the final proposed transaction were incorrectly submitted in favor of the transaction. On May 31, 2016, the Court determined that the fair value of Dell at the time of the merger was $17.62 per share, as opposed to the $13.75 price offered in the transaction. As a result, any shareholder perfecting appraisal rights is entitled to a payment at $17.62 per share plus statutory interest from the date the Dell transaction closed. The compensation to Clients was intended to make them whole for the voting discrepancy that resulted in the denial of their appraisal rights. On December 30, 2016, we signed a settlement agreement with our insurance carrier for insurance proceeds totaling $100.0 million related to this matter. We recognized the proceeds as a reduction to the $166.2 million nonrecurring charge that we recognized in the second quarter of 2016 and as a receivable in other assets at December 31, 2016. We received the insurance proceeds on January 24, 2017. In the first quarter of 2017, we recognized a reduction in operating expenses from insurance recoveries from other insurance carriers totaling an additional $50 million, of which $40 million was paid during the first quarter and the remaining $10 million was paid during the second quarter. In accordance with the compensation payment, the Clients agreed that in the event the findings made by the Court regarding the fair value of Dell or the amount of interest to be applied were modified by the Supreme Court of Delaware on appeal, T. Rowe Price and the Clients would make an appropriate adjustment between themselves, calculated in a manner that is consistent with the methodology used to compensate Clients. In December 2016, several parties, including Dell and the successful appraisal petitioners, filed appeals to the Delaware Supreme Court to challenge the Chancery Court’s valuation ruling. Our settlement agreements with our insurance carriers provide that if the fair value of Dell is reduced, we would work together to make appropriate adjustments.

COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES. On February 14, 2017, T. Rowe Price Group, Inc., T. Rowe Price Associates, Inc., T. Rowe Price Trust Company, current and former members of the management committee, and trustees of the T. Rowe Price U.S. Retirement Program were named as defendants in a lawsuit filed in the United States District Court for the District of Maryland. The lawsuit alleges breaches of ERISA’s fiduciary duty and prohibited transaction provisions on behalf of a class of all participants and beneficiaries of the T. Rowe Price 401(k) Plan from February 14, 2011, to the time of judgment. The plaintiffs are seeking certification of the complaint as a class action. T. Rowe Price believes the claims are without merit and is vigorously defending the action. This matter is in the early stages of litigation and we cannot predict the eventual outcome or whether it will have a material negative impact on our financial results, or estimate the possible loss or range of loss that may arise from any negative outcome. On April 27, 2016, certain shareholders in the T. Rowe Price Blue Chip Growth Fund, T. Rowe Price Capital Appreciation Fund, T. Rowe Price Equity Income Fund, T. Rowe Price Growth Stock Fund, T. Rowe Price International Stock Fund, T. Rowe Price High Yield Fund, T. Rowe Price New Income Fund and T. Rowe Price Small Cap Stock Fund (the “Funds”) filed a Section 36(b) complaint under the caption Zoidis v. T. Rowe Price Assoc., Inc., against T. Rowe Price Associates, Inc. (“T. Rowe Price”) in the United States District Court for the Northern District of California. The complaint alleges that the management fees for the identified funds are excessive because T. Rowe Price charges lower advisory fees to subadvised clients with funds in the same strategy. The complaint seeks to recover the allegedly excessive advisory fees received by T. Rowe Price in the year preceding the start of the lawsuit, along with investments’ returns and profits. In the alternative, the complaint seeks the rescission of each fund’s investment management agreement and restitution of any allegedly excessive management fees. T. Rowe Price believes the claims are without merit and is vigorously defending the action. This matter is in the early stages of litigation and we cannot predict the eventual outcome or whether it will have a material negative impact on our financial results, or estimate the possible loss or range of loss that may arise from any negative outcome. In addition to the matters discussed above, various claims against us arise in the ordinary course of business, including employment-related claims. In the opinion of management, after consultation with counsel, the likelihood of an adverse determination in one or more of these pending ordinary course of business claims that would have a material adverse effect on our financial position or results of operations is remote.

SUPPLEMENTARY CONSOLIDATING CASH FLOW STATEMENT.

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

SUPPLEMENTARY CONSOLIDATING CASH FLOW STATEMENT

SUPPLEMENTARY CONSOLIDATING CASH FLOW STATEMENT.

The following tables summarize the cash flows (in millions) for the nine months ended September 30, 2016 and 2017, that are attributable to T. Rowe Price Group, our consolidated sponsored investment portfolios and the related eliminations required in preparing the statements.



	Nine months ended
	9/30/2016												9/30/2017
	Cash flow attributable to T. Rowe Price Group			Cash flow attributable to consolidated sponsored investment portfolios			Eliminations			As reported			Cash flow attributable to T. Rowe Price Group			Cash flow attributable to consolidated sponsored investment portfolios			Eliminations			As reported
Cash flows from operating activities
Net income	$	835.2		$	114.1		$	(62.1	)	$	887.2		$	1,150.7		$	117.3		$	(73.4	)	$	1,194.6
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization of property and equipment	100.0			—			—			100.0			106.9			—			—			106.9
Stock-based compensation expense	117.9			—			—			117.9			110.6			—			—			110.6
Realized gains on dispositions of available-for-sale sponsored investment portfolios	(52.3		)	—			—			(52.3		)	(78.0		)	—			—			(78.0		)
Gains recognized upon transfer of an available-for-sale sponsored investment portfolio to sponsored investment portfolios held as trading	—			—			—			—			(23.6		)	—			—			(23.6		)
Net gains recognized on investments	(90.2		)	—			62.1			(28.1		)	(113.8		)	—			73.4			(40.4		)
Investments in sponsored investment portfolios held as trading to economically hedge supplemental savings plan liability	—			—			—			—			(129.0		)	—			—			(129.0		)
Net change in trading securities held by consolidated sponsored investment portfolios	—			(1,084.1		)	—			(1,084.1		)	—			(1,210.5		)	—			(1,210.5		)
Other changes in assets and liabilities	324.7			6.9			(4.0		)	327.6			438.6			(12.9		)	(3.5		)	422.2
Net cash provided by (used in) operating activities	1,235.3			(963.1		)	(4.0		)	268.2			1,462.4			(1,106.1		)	(3.5		)	352.8
Net cash provided by (used in) investing activities	(163.1		)	54.3			219.1			110.3			(63.2		)	(46.0		)	184.6			75.4
Net cash provided by (used in) financing activities	(843.5		)	1,013.3			(215.1		)	(45.3		)	(734.7		)	1,186.4			(181.1		)	270.6
Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios	—			(18.2		)	—			(18.2		)	—			6.9			—			6.9
Net change in cash and cash equivalents during period	228.7			86.3			—			315.0			664.5			41.2			—			705.7
Cash and cash equivalents at beginning of year	1,172.3			—			—			1,172.3			1,204.9			65.6			—			1,270.5
Cash and cash equivalents at end of period	$	1,401.0		$	86.3		$	—		$	1,487.3		$	1,869.4		$	106.8		$	—		$	1,976.2

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Tables)

9 Months Ended

Sep. 30, 2017

Information about Receivables, Revenues, and Services [Abstract]

Components of revenues from advisory services

Revenues (in millions) from advisory services provided under agreements with our sponsored U.S. mutual funds and other investment clients include:



	Three months ended				Nine months ended
	9/30/2016		9/30/2017		9/30/2016		9/30/2017
Sponsored U.S. mutual funds
Stock and blended asset	$	579.3	$	656.8	$	1,649.9	$	1,879.5
Bond and money market	124.2		127.1		354.8		374.5
	703.5		783.9		2,004.7		2,254.0
Other investment portfolios
Stock and blended asset	222.2		259.6		630.4		727.8
Bond, money market, and stable value	44.8		53.2		126.8		149.9
	267.0		312.8		757.2		877.7
Total	$	970.5	$	1,096.7	$	2,761.9	$	3,131.7

Components of assets under management

The following table summarizes the investment portfolios and assets under management (in billions) on which we earn advisory fees.



	Average during				Average during
	the third quarter of				the first nine months of
	2016		2017		2016		2017
Sponsored U.S. mutual funds
Stock and blended asset	$	399.3	$	452.9	$	381.5	$	438.2
Bond and money market	112.0		123.2		108.2		119.6
	511.3		576.1		489.7		557.8
Other investment portfolios
Stock and blended asset	218.2		264.6		208.2		247.0
Bond, money market, and stable value	74.1		86.7		70.4		81.5
	292.3		351.3		278.6		328.5
Total	$	803.6	$	927.4	$	768.3	$	886.3

					As of
					12/31/2016		9/30/2017
Sponsored U.S. mutual funds
Stock and blended asset					$	401.3	$	461.9
Bond and money market					112.9		123.4
					514.2		585.3
Other investment portfolios
Stock and blended asset					220.8		273.1
Bond, money market, and stable value					75.8		89.5
					296.6		362.6
Total					$	810.8	$	947.9

Components of other fees

The following table summarizes other fees (in millions) we earn from our sponsored U.S. mutual funds.



	Three months ended				Nine months ended
	9/30/2016		9/30/2017		9/30/2016		9/30/2017
Administrative fees	$	66.6	$	69.2	$	208.6	$	210.6
Distribution and servicing fees	$	36.7	$	37.4	$	106.2	$	109.0

INVESTMENTS. (Tables)

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Unconsolidated investments

The carrying values of investments (in millions) we do not consolidate are as follows:



	12/31/2016		9/30/2017
Available-for-sale sponsored investment portfolios	$	709.0	$	573.0
Equity method investments
Sponsored investment portfolios	252.3		287.7
26% interest in UTI Asset Management Company Limited (India)	140.9		154.6
Investment partnerships	5.3		4.9
Trading investments
Sponsored investment portfolios designated as economic hedge of supplemental savings plan liability	—		178.4
Other sponsored investment portfolios	75.4		82.3
Cost method investments	73.6		77.4
U.S. Treasury note	1.0		1.0
Total	$	1,257.5	$	1,359.3

Net impact of deconsolidation and consolidation on condensed consolidated balance sheets and income statements

The net impact of these changes on our condensed consolidated balance sheets and income statements as of the dates the portfolios were deconsolidated or reconsolidated is detailed below.



	Three months ended					Nine months ended
	9/30/2016			9/30/2017		9/30/2016			9/30/2017
Net increase (decrease) in assets of consolidated sponsored investment portfolios	$	(315.1	)	$	13.5	$	(678.3	)	$	(1,060.5	)
Net increase (decrease) in liabilities of consolidated sponsored investment portfolios	$	(28.8	)	$	—	$	(31.0	)	$	(133.6	)
Net increase (decrease) in redeemable non-controlling interests	$	(237.3	)	$	7.9	$	(398.6	)	$	(779.3	)

Gain recognized upon deconsolidation	$	1.1		$	.1	$	1.1		$	.1

Available-for-sale sponsored investment portfolios

The available-for-sale sponsored investment portfolios (in millions) include:



	Aggregate cost		Unrealized holding					Aggregate fair value
	Aggregate cost		gains		losses			Aggregate fair value
December 31, 2016
Stock and blended asset funds	$	162.9	$	88.0	$	(1.9	)	$	249.0
Bond funds	463.3		1.7		(5.0		)	460.0
Total	$	626.2	$	89.7	$	(6.9	)	$	709.0

September 30, 2017
Stock and blended asset funds	$	118.8	$	16.5	$	—		$	135.3
Bond funds	436.3		4.3		(2.9		)	437.7
Total	$	555.1	$	20.8	$	(2.9	)	$	573.0

Continuous unrealized loss positions



	Number of holdings	Unrealized holding losses			Aggregate fair value
December 31, 2016
Less than 12 months	8	$	(4.2	)	$	328.1
12 months or more	2	(2.7		)	169.5
Total	10	$	(6.9	)	$	497.6

September 30, 2017
Less than 12 months	2	$	(.7	)	$	24.5
12 months or more	1	(2.2		)	168.3
Total	3	$	(2.9	)	$	192.8

Maximum risk of loss related to investments in variable interest entities

Our maximum risk of loss (in millions) related to our involvement with these entities is as follows:



	12/31/2016		9/30/2017
Investment carrying values	$	149.2	$	132.9
Unfunded capital commitments	46.4		43.3
Uncollected investment advisory and administrative fees	5.9		6.4
	$	201.5	$	182.6

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

FAIR VALUE MEASUREMENTS. (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair value measurements summary

The following table summarizes our investments (in millions) that are recognized in our condensed consolidated balance sheets using fair value measurements determined based on the differing levels of inputs.



	Level 1		Level 2
December 31, 2016
Cash equivalents	$	1,052.3	$	—
Available-for-sale sponsored investment portfolios	709.0		—
Sponsored investment portfolios held as trading	60.3		15.1
Total	$	1,821.6	$	15.1

September 30, 2017
Cash equivalents	$	1,606.3	$	—
Available-for-sale sponsored investment portfolios	573.0		—
Sponsored investment portfolios held as trading	242.9		17.8
Total	$	2,422.2	$	17.8

CONSOLIDATED SPONSORED INVESTMENT PORTFOLIOS. (Tables)

9 Months Ended

Sep. 30, 2017

Consolidated Sponsored Investment Portfolios [Abstract]

Net assets of consolidated sponsored investment portfolios

The following table details the net assets of the consolidated sponsored investment portfolios:



	December 31, 2016						September 30, 2017
	Voting interest entities		Variable interest entities		Total		Voting interest entities		Variable interest entities		Total
Cash and cash equivalents⁽¹⁾	$	10.3	$	55.3	$	65.6	$	9.5	$	97.3	$	106.8
Investments⁽²⁾	219.3		1,340.6		1,559.9		220.7		1,720.0		1,940.7
Other assets	4.8		50.2		55.0		6.4		28.2		34.6
Total assets	234.4		1,446.1		1,680.5		236.6		1,845.5		2,082.1
Liabilities	8.8		56.8		65.6		10.5		43.3		53.8
Net assets	$	225.6	$	1,389.3	$	1,614.9	$	226.1	$	1,802.2	$	2,028.3

Attributable to T. Rowe Price Group	$	156.1	$	771.6	$	927.7	$	165.7	$	908.8	$	1,074.5
Attributable to redeemable non-controlling interests	69.5		617.7		687.2		60.4		893.4		953.8
	$	225.6	$	1,389.3	$	1,614.9	$	226.1	$	1,802.2	$	2,028.3

⁽²⁾Investments includes $4.2 million and $14.4 million at December 31, 2016 and September 30, 2017, respectively, of investments in sponsored portfolios that are considered related parties.

Operating results of consolidated sponsored investment portfolios



	Three months ended
	9/30/2016									9/30/2017
	Voting interest entities			Variable interest entities			Total			Voting interest entities			Variable interest entities			Total
Operating expenses reflected in net operating income	$	(.4	)	$	(3.4	)	$	(3.8	)	$	(.4	)	$	(2.8	)	$	(3.2	)
Net investment income reflected in non-operating income	8.7			65.1			73.8			4.6			32.9			37.5
Impact on income before taxes	$	8.3		$	61.7		$	70.0		$	4.2		$	30.1		$	34.3

Net income attributable to T. Rowe Price Group	$	6.2		$	28.9		$	35.1		$	3.1		$	17.9		$	21.0
Net income attributable to redeemable non-controlling interests	2.1			32.8			34.9			1.1			12.2			13.3
	$	8.3		$	61.7		$	70.0		$	4.2		$	30.1		$	34.3



	Nine months ended
	9/30/2016									9/30/2017
	Voting interest entities			Variable interest entities			Total			Voting interest entities			Variable interest entities			Total
Operating expenses reflected in net operating income	$	(1.2	)	$	(8.7	)	$	(9.9	)	$	(.9	)	$	(7.6	)	$	(8.5	)
Net investment income reflected in non-operating income	20.8			103.2			124.0			14.7			111.1			125.8
Impact on income before taxes	$	19.6		$	94.5		$	114.1		$	13.8		$	103.5		$	117.3

Net income attributable to T. Rowe Price Group	$	13.9		$	48.2		$	62.1		$	10.4		$	63.0		$	73.4
Net income attributable to redeemable non-controlling interests	5.7			46.3			52.0			3.4			40.5			43.9
	$	19.6		$	94.5		$	114.1		$	13.8		$	103.5		$	117.3

Cash flows of consolidated sponsored investment portfolios



	Nine months ended
	September 30, 2016									September 30, 2017
	Voting interest entities			Variable interest entities			Total			Voting interest entities			Variable interest entities			Total
Net cash provided by (used in) operating activities	$	(48.0	)	$	(915.1	)	$	(963.1	)	$	(28.0	)	$	(1,078.1	)	$	(1,106.1	)
Net cash provided by (used in) investing activities	22.2			32.1			54.3			(6.1		)	(39.9		)	(46.0		)
Net cash provided by (used in) financing activities	38.4			974.9			1,013.3			33.3			1,153.1			1,186.4
Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios	—			(18.2		)	(18.2		)	—			6.9			6.9
Net change in cash and cash equivalents during period	12.6			73.7			86.3			(.8		)	42.0			41.2
Cash and cash equivalents at beginning of year	—			—			—			10.3			55.3			65.6
Cash and cash equivalents at end of period	$	12.6		$	73.7		$	86.3		$	9.5		$	97.3		$	106.8

Fair values of investments held by consolidated sponsored investment portfolios

The following table summarizes the investment holdings held by our consolidated sponsored investment portfolios (in millions) using fair value measurements determined based on the differing levels of inputs.



	Level 1			Level 2
December 31, 2016
Assets
Cash equivalents	$	8.8		$	.8
Equity securities	281.8			325.3
Fixed income securities	—			918.1
Other investments	.4			34.3
	$	291.0		$	1,278.5

Liabilities	$	(.6	)	$	(13.6	)

September 30, 2017
Assets
Cash equivalents	$	8.2		$	1.1
Equity securities	511.4			508.6
Fixed income securities	—			895.4
Other investments	2.0			23.3
	$	521.6		$	1,428.4

Liabilities	$	(.5	)	$	(14.5	)

STOCK-BASED COMPENSATION. (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Rollforward of stock options

The following table summarizes the status of, and changes in, our stock options during the first nine months of 2017.



	Options		Weighted- average exercise price
Outstanding at December 31, 2016	24,364,322		$	61.90
Exercised	(5,803,025	)	$	50.09
Forfeited	(66,936	)	$	74.41
Expired	(39,631	)	$	76.06
Outstanding at September 30, 2017	18,454,730		$	65.54
Exercisable at September 30, 2017	11,731,672		$	60.65

Rollforward of nonvested restricted shares and restricted stock units

The following table summarizes the status of, and changes in, our nonvested restricted shares and restricted stock units during the first nine months of 2017.



	Restricted shares		Restricted stock units		Weighted-average fair value
Nonvested at December 31, 2016	931,508		4,634,461		$	72.19
Time-based grants	17,022		78,484		$	69.60
Vested	(10,717	)	(48,319	)	$	71.73
Forfeited	(13,007	)	(50,996	)	$	72.84
Nonvested at September 30, 2017	924,806		4,613,630		$	72.15

Future stock-based compensation expense



Fourth quarter 2017	$	34.3
2018	86.3
2019 through 2022	73.1
Total	$	193.7

EARNINGS PER SHARE CALCULATIONS. (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Earnings per share reconciliation



	Three months ended				Nine months ended
	9/30/2016		9/30/2017		9/30/2016		9/30/2017
Net income attributable to T. Rowe Price Group	$	327.8	$	390.9	$	835.2	$	1,150.7
Less: net income allocated to outstanding restricted stock and stock unit holders	7.3		8.8		17.1		26.0
Net income allocated to common stockholders	$	320.5	$	382.1	$	818.1	$	1,124.7

Weighted-average common shares
Outstanding	245.6		240.3		246.4		240.7
Outstanding assuming dilution	250.1		244.4		251.5		244.3

Anti-dilutive securities



	Three months ended		Nine months ended
	9/30/2016	9/30/2017	9/30/2016	9/30/2017
Weighted-average outstanding stock options excluded	10.3	2.1	9.9	6.7

OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Tables)

9 Months Ended

Sep. 30, 2017

Stockholders' Equity Note [Abstract]

Impact of the components of other comprehensive income (loss) on deferred tax benefits (income taxes)

The following table presents the impact of the components (in millions) of other comprehensive income or loss on deferred tax benefits (income taxes).



	Three months ended						Nine months ended
	9/30/2016			9/30/2017			9/30/2016			9/30/2017
Net deferred tax benefits (income taxes) on:
Net unrealized holding gains or losses	$	(4.0	)	$	(1.9	)	$	(3.6	)	$	(14.4	)
Reclassification adjustments recognized in the provision for income taxes:
Net gains realized on dispositions	—			—			20.6			30.5
Net gains recognized upon transfer to trading investments	—			—			—			9.2
Net deferred tax benefits (income taxes) on net unrealized holding gains or losses	(4.0		)	(1.9		)	17.0			25.3
Currency translation adjustments	(1.1		)	(5.2		)	(3.9		)	(17.1		)
Reclassification adjustment recognized in the provision for income taxes upon deconsolidation of sponsored fund subsidiary	.4			—			.4			—
Total deferred tax benefits (income taxes) on currency translation adjustments	(.7		)	(5.2		)	(3.5		)	(17.1		)
Total net deferred tax benefits (income taxes)	$	(4.7	)	$	(7.1	)	$	13.5		$	8.2

Changes in accumulated other comprehensive income



				Currency translation adjustments
	Net unrealized holding gains			Equity method investments			Consolidated sponsored investment portfolios - variable interest entities			Total currency translation adjustments			Total
Balances at December 31, 2016	$	52.2		$	(32.3	)	$	(8.4	)	$	(40.7	)	$	11.5
Other comprehensive income before reclassifications and income taxes	37.1			4.5			39.9			44.4			81.5
Reclassification adjustments recognized in non-operating income	(101.6		)	—			(.1		)	(.1		)	(101.7		)
	(64.5		)	4.5			39.8			44.3			(20.2		)
Net deferred tax benefits (income taxes)	25.3			(1.6		)	(15.5		)	(17.1		)	8.2
Other comprehensive income (loss)	(39.2		)	2.9			24.3			27.2			(12.0		)
Balances at September 30, 2017	$	13.0		$	(29.4	)	$	15.9		$	(13.5	)	$	(.5	)

SUPPLEMENTARY CONSOLIDATING CASH FLOW STATEMENT. (Tables)

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplementary consolidating cash flow statement



	Nine months ended
	9/30/2016												9/30/2017
	Cash flow attributable to T. Rowe Price Group			Cash flow attributable to consolidated sponsored investment portfolios			Eliminations			As reported			Cash flow attributable to T. Rowe Price Group			Cash flow attributable to consolidated sponsored investment portfolios			Eliminations			As reported
Cash flows from operating activities
Net income	$	835.2		$	114.1		$	(62.1	)	$	887.2		$	1,150.7		$	117.3		$	(73.4	)	$	1,194.6
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization of property and equipment	100.0			—			—			100.0			106.9			—			—			106.9
Stock-based compensation expense	117.9			—			—			117.9			110.6			—			—			110.6
Realized gains on dispositions of available-for-sale sponsored investment portfolios	(52.3		)	—			—			(52.3		)	(78.0		)	—			—			(78.0		)
Gains recognized upon transfer of an available-for-sale sponsored investment portfolio to sponsored investment portfolios held as trading	—			—			—			—			(23.6		)	—			—			(23.6		)
Net gains recognized on investments	(90.2		)	—			62.1			(28.1		)	(113.8		)	—			73.4			(40.4		)
Investments in sponsored investment portfolios held as trading to economically hedge supplemental savings plan liability	—			—			—			—			(129.0		)	—			—			(129.0		)
Net change in trading securities held by consolidated sponsored investment portfolios	—			(1,084.1		)	—			(1,084.1		)	—			(1,210.5		)	—			(1,210.5		)
Other changes in assets and liabilities	324.7			6.9			(4.0		)	327.6			438.6			(12.9		)	(3.5		)	422.2
Net cash provided by (used in) operating activities	1,235.3			(963.1		)	(4.0		)	268.2			1,462.4			(1,106.1		)	(3.5		)	352.8
Net cash provided by (used in) investing activities	(163.1		)	54.3			219.1			110.3			(63.2		)	(46.0		)	184.6			75.4
Net cash provided by (used in) financing activities	(843.5		)	1,013.3			(215.1		)	(45.3		)	(734.7		)	1,186.4			(181.1		)	270.6
Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios	—			(18.2		)	—			(18.2		)	—			6.9			—			6.9
Net change in cash and cash equivalents during period	228.7			86.3			—			315.0			664.5			41.2			—			705.7
Cash and cash equivalents at beginning of year	1,172.3			—			—			1,172.3			1,204.9			65.6			—			1,270.5
Cash and cash equivalents at end of period	$	1,401.0		$	86.3		$	—		$	1,487.3		$	1,869.4		$	106.8		$	—		$	1,976.2

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Receivables) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Receivables from sponsored mutual funds
Accounts receivable for advisory fees and advisory-related administrative services	$ 507.9	$ 455.1
Sponsored U.S. mutual funds and other sponsored investment portfolios [Member]
Receivables from sponsored mutual funds
Accounts receivable for advisory fees and advisory-related administrative services	$ 332.4	$ 303.1

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Revenue and Services [Line Items]
Revenues from advisory services	$ 1,096,700,000	$ 970,500,000	$ 3,131,700,000	$ 2,761,900,000
Average assets under management	927,400,000,000	803,600,000,000	886,300,000,000	768,300,000,000
Period end assets under management	947,900,000,000		947,900,000,000		$ 810,800,000,000
Waived money market related fees [Member]
Revenue and Services [Line Items]
Revenues from advisory services		2,100,000	0	9,400,000
Sponsored U.S. mutual funds [Member]
Revenue and Services [Line Items]
Revenues from advisory services	783,900,000	703,500,000	2,254,000,000	2,004,700,000
Average assets under management	576,100,000,000	511,300,000,000	557,800,000,000	489,700,000,000
Period end assets under management	585,300,000,000		585,300,000,000		514,200,000,000
Sponsored U.S. mutual funds [Member] \| Stock and blended asset [Member]
Revenue and Services [Line Items]
Revenues from advisory services	656,800,000	579,300,000	1,879,500,000	1,649,900,000
Average assets under management	452,900,000,000	399,300,000,000	438,200,000,000	381,500,000,000
Period end assets under management	461,900,000,000		461,900,000,000		401,300,000,000
Sponsored U.S. mutual funds [Member] \| Bond and money market [Member]
Revenue and Services [Line Items]
Revenues from advisory services	127,100,000	124,200,000	374,500,000	354,800,000
Average assets under management	123,200,000,000	112,000,000,000	119,600,000,000	108,200,000,000
Period end assets under management	123,400,000,000		123,400,000,000		112,900,000,000
Other investment portfolios [Member]
Revenue and Services [Line Items]
Revenues from advisory services	312,800,000	267,000,000	877,700,000	757,200,000
Average assets under management	351,300,000,000	292,300,000,000	328,500,000,000	278,600,000,000
Period end assets under management	362,600,000,000		362,600,000,000		296,600,000,000
Other investment portfolios [Member] \| Stock and blended asset [Member]
Revenue and Services [Line Items]
Revenues from advisory services	259,600,000	222,200,000	727,800,000	630,400,000
Average assets under management	264,600,000,000	218,200,000,000	247,000,000,000	208,200,000,000
Period end assets under management	273,100,000,000		273,100,000,000		220,800,000,000
Other investment portfolios [Member] \| Bond, money market, and stable value [Member]
Revenue and Services [Line Items]
Revenues from advisory services	53,200,000	44,800,000	149,900,000	126,800,000
Average assets under management	86,700,000,000	74,100,000,000	81,500,000,000	70,400,000,000
Period end assets under management	89,500,000,000		89,500,000,000		$ 75,800,000,000
Other sponsored investment portfolios [Member]
Revenue and Services [Line Items]
Revenues from advisory services	$ 125,100,000	$ 101,100,000	$ 339,800,000	$ 283,300,000

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Revenues and Services Concentration) (Details)	Sep. 30, 2017	Dec. 31, 2016
Outside U.S. [Member] \| Assets under management [Member] \| Investment advisory clients [Member] \| Geographic concentration [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	5.40%	4.70%

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Other Fees Earned from Sponsored U.S. Mutual Funds) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue and Services [Line Items]
Administrative fees	$ 87.6	$ 85.7	$ 266.2	$ 263.6
Distribution and servicing fees	37.4	36.7	109.0	106.2
Sponsored U.S. mutual funds [Member]
Revenue and Services [Line Items]
Administrative fees	69.2	66.6	210.6	208.6
Distribution and servicing fees	$ 37.4	$ 36.7	$ 109.0	$ 106.2

INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Investment [Line Items]
Available-for-sale sponsored investment portfolios	$ 573.0		$ 573.0		$ 709.0
Cost method investments	77.4		77.4		73.6
U.S. Treasury note	1.0		1.0		1.0
Total	1,359.3		1,359.3		1,257.5
Gain recognized upon deconsolidation	67.3	$ 88.3	294.3	$ 214.9
Currency translation adjustments [Member] \| Reclassification out of accumulated other comprehensive income [Member]
Investment [Line Items]
Gain recognized upon deconsolidation	0.1	1.1	0.1	1.1
Assets [Member]
Investment [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest	(13.5)	315.1	1,060.5	678.3
Liability [Member]
Investment [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest	0.0	(28.8)	(133.6)	(31.0)
Redeemable non-controlling interests [Member]
Investment [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest	7.9	$ (237.3)	(779.3)	$ (398.6)
Sponsored investment portfolios [Member]
Investment [Line Items]
Equity method investments	287.7		287.7		252.3
Sponsored investment portfolios designated as economic hedge of supplemental savings plan liability [Member]
Investment [Line Items]
Trading investments	178.4		178.4		0.0
Other sponsored investment portfolios [Member]
Investment [Line Items]
Trading investments	82.3		82.3		75.4
Interest in UTI Asset Management Company Limited (India) [Member]
Investment [Line Items]
Equity method investments	$ 154.6		$ 154.6		$ 140.9
Equity method investment (ownership percentage)	26.00%		26.00%		26.00%
Investment partnerships [Member]
Investment [Line Items]
Equity method investments	$ 4.9		$ 4.9		$ 5.3

INVESTMENTS. (Available-For-Sale Sponsored Investment Portfolios) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Aggregate cost	$ 555.1	$ 626.2
Unrealized holding gains	20.8	89.7
Unrealized holding losses	(2.9)	(6.9)
Aggregate fair value	573.0	709.0
Stock and blended asset funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate cost	118.8	162.9
Unrealized holding gains	16.5	88.0
Unrealized holding losses	0.0	(1.9)
Aggregate fair value	135.3	249.0
Bond funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate cost	436.3	463.3
Unrealized holding gains	4.3	1.7
Unrealized holding losses	(2.9)	(5.0)
Aggregate fair value	$ 437.7	$ 460.0

INVESTMENTS. (Unrealized Losses on Available-For-Sale Sponsored Investment Portfolios) (Details) $ in Millions	Sep. 30, 2017 USD ($) security	Dec. 31, 2016 USD ($) security
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]
Fund holdings with temporary unrealized losses less than 12 months (number of securities) \| security	2	8
Fund holdings with temporary unrealized losses longer than 12 months (number of securities) \| security	1	2
Fund holdings with temporary unrealized holding losses (number of securities) \| security	3	10
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized holding losses on fund holdings that were in a continuous loss for less than 12 months	$ (0.7)	$ (4.2)
Unrealized holding losses on fund holdings that were in a continuous loss for longer than 12 months	(2.2)	(2.7)
Unrealized holding losses on fund holdings that were in a continuous loss	(2.9)	(6.9)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Unrealized holding losses for less than 12 months at period end are attributable to fund holdings with an aggregate fair value of	24.5	328.1
Unrealized holding losses for longer than 12 months at period end are attributable to fund holdings with an aggregate fair value of	168.3	169.5
Unrealized holding losses at period end are attributable to fund holdings with an aggregate fair value of	$ 192.8	$ 497.6

INVESTMENTS. (Variable Interest Entities) (Details) - Variable interest entity, not primary beneficiary [Member] - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Investment carrying values	$ 132.9	$ 149.2
Unfunded capital commitments	43.3	46.4
Uncollected investment advisory and administrative fees	6.4	5.9
Maximum risk of loss related to nonconsolidated variable interest entities	$ 182.6	$ 201.5

FAIR VALUE MEASUREMENTS. (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale sponsored investment portfolios	$ 573.0	$ 709.0
Level 1 [Member] \| Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,606.3	1,052.3
Available-for-sale sponsored investment portfolios	573.0	709.0
Sponsored investment portfolios held as trading	242.9	60.3
Total	2,422.2	1,821.6
Level 2 [Member] \| Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.0	0.0
Available-for-sale sponsored investment portfolios	0.0	0.0
Sponsored investment portfolios held as trading	17.8	15.1
Total	$ 17.8	$ 15.1

CONSOLIDATED SPONSORED INVESTMENT PORTFOLIOS. (Net Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,869.4	$ 1,204.9
Investments	1,359.3	1,257.5
Other assets	260.2	346.2
Total assets	7,379.6	6,225.0
Liabilities	897.8	529.2
Attributable to redeemable non-controlling interests	953.8	687.2
Consolidated sponsored investment portfolios [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	106.8		$ 86.3
Net assets	2,028.3	1,614.9
Attributable to T. Rowe Price Group	1,074.5	927.7
Attributable to redeemable non-controlling interests	953.8	687.2
Consolidated sponsored investment portfolios [Member] \| Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	106.8	65.6	86.3	$ 0.0
Investments	1,940.7	1,559.9
Other assets	34.6	55.0
Total assets	2,082.1	1,680.5
Liabilities	53.8	65.6
Net assets	2,028.3	1,614.9
Voting interest entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	226.1	225.6
Attributable to T. Rowe Price Group	165.7	156.1
Attributable to redeemable non-controlling interests	60.4	69.5
Voting interest entities [Member] \| Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	9.5	10.3	12.6	0.0
Investments	220.7	219.3
Other assets	6.4	4.8
Total assets	236.6	234.4
Liabilities	10.5	8.8
Net assets	226.1	225.6
Variable interest entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	1,802.2	1,389.3
Attributable to T. Rowe Price Group	908.8	771.6
Attributable to redeemable non-controlling interests	893.4	617.7
Variable interest entities [Member] \| Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	97.3	55.3	$ 73.7	$ 0.0
Investments	1,720.0	1,340.6
Other assets	28.2	50.2
Total assets	1,845.5	1,446.1
Liabilities	43.3	56.8
Net assets	1,802.2	1,389.3
Sponsored U.S. mutual funds and other sponsored investment portfolios [Member] \| Consolidated sponsored investment portfolios [Member] \| Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	8.2	8.8
Investments	$ 14.4	$ 4.2

CONSOLIDATED SPONSORED INVESTMENT PORTFOLIOS. (Operating Results) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Income Statements, Captions [Line Items]
Operating expenses	$ (673.2)	$ (617.2)	$ (1,929.1)	$ (1,961.6)
Income before income taxes	615.8	564.0	1,872.1	1,385.0
Net income attributable to redeemable non-controlling interests	13.3	34.9	43.9	52.0
Investment advisory and administrative fees	(1,221.7)	(1,092.9)	(3,506.9)	(3,131.7)
Consolidation eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Operating expenses	1.4	2.2	3.2	5.3
Investment advisory and administrative fees	1.4	2.2	3.2	5.3
Consolidated sponsored investment portfolios [Member]
Condensed Income Statements, Captions [Line Items]
Income before income taxes	34.3	70.0	117.3	114.1
Net income attributable to T. Rowe Price Group	21.0	35.1	73.4	62.1
Net income attributable to redeemable non-controlling interests	13.3	34.9	43.9	52.0
Consolidated sponsored investment portfolios [Member] \| Reportable entities [Member]
Condensed Income Statements, Captions [Line Items]
Operating expenses	(3.2)	(3.8)	(8.5)	(9.9)
Non-operating investment income	37.5	73.8	125.8	124.0
Income before income taxes	34.3	70.0	117.3	114.1
Voting interest entities [Member]
Condensed Income Statements, Captions [Line Items]
Income before income taxes	4.2	8.3	13.8	19.6
Net income attributable to T. Rowe Price Group	3.1	6.2	10.4	13.9
Net income attributable to redeemable non-controlling interests	1.1	2.1	3.4	5.7
Voting interest entities [Member] \| Reportable entities [Member]
Condensed Income Statements, Captions [Line Items]
Operating expenses	(0.4)	(0.4)	(0.9)	(1.2)
Non-operating investment income	4.6	8.7	14.7	20.8
Income before income taxes	4.2	8.3	13.8	19.6
Variable interest entities [Member]
Condensed Income Statements, Captions [Line Items]
Income before income taxes	30.1	61.7	103.5	94.5
Net income attributable to T. Rowe Price Group	17.9	28.9	63.0	48.2
Net income attributable to redeemable non-controlling interests	12.2	32.8	40.5	46.3
Variable interest entities [Member] \| Reportable entities [Member]
Condensed Income Statements, Captions [Line Items]
Operating expenses	(2.8)	(3.4)	(7.6)	(8.7)
Non-operating investment income	32.9	65.1	111.1	103.2
Income before income taxes	$ 30.1	$ 61.7	$ 103.5	$ 94.5

CONSOLIDATED SPONSORED INVESTMENT PORTFOLIOS. (Statement of Cash Flows) (Details) - USD ($)
$ in Millions

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Condensed Cash Flow Statements, Captions [Line Items]

Net cash provided by (used in) operating activities

^[1]

$ 352.8

$ 268.2

Net cash provided by (used in) investing activities

^[1]

75.4

110.3

Net cash provided by (used in) financing activities

^[1]

270.6

(45.3)

Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios

^[1]

6.9

(18.2)

Net change in cash and cash equivalents during period

^[1]

705.7

315.0

Cash and cash equivalents at beginning of year

1,204.9

Cash and cash equivalents at end of period

1,869.4

Consolidation eliminations [Member]

Condensed Cash Flow Statements, Captions [Line Items]

Net cash provided by (used in) operating activities

(3.5)

(4.0)

Net cash provided by (used in) investing activities

184.6

219.1

Net cash provided by (used in) financing activities

(181.1)

(215.1)

Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios

0.0

Net change in cash and cash equivalents during period

0.0

Consolidated sponsored investment portfolios [Member]

Condensed Cash Flow Statements, Captions [Line Items]

Cash and cash equivalents at end of period

106.8

86.3

Consolidated sponsored investment portfolios [Member] | Reportable entities [Member]

Condensed Cash Flow Statements, Captions [Line Items]

Net cash provided by (used in) operating activities

(1,106.1)

(963.1)

Net cash provided by (used in) investing activities

(46.0)

54.3

Net cash provided by (used in) financing activities

1,186.4

1,013.3

Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios

6.9

(18.2)

Net change in cash and cash equivalents during period

41.2

86.3

Cash and cash equivalents at beginning of year

65.6

0.0

Cash and cash equivalents at end of period

106.8

86.3

Voting interest entities [Member] | Reportable entities [Member]

Condensed Cash Flow Statements, Captions [Line Items]

Net cash provided by (used in) operating activities

(28.0)

(48.0)

Net cash provided by (used in) investing activities

(6.1)

22.2

Net cash provided by (used in) financing activities

33.3

38.4

Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios

0.0

Net change in cash and cash equivalents during period

(0.8)

12.6

Cash and cash equivalents at beginning of year

10.3

0.0

Cash and cash equivalents at end of period

9.5

12.6

Variable interest entities [Member] | Reportable entities [Member]

Condensed Cash Flow Statements, Captions [Line Items]

Net cash provided by (used in) operating activities

(1,078.1)

(915.1)

Net cash provided by (used in) investing activities

(39.9)

32.1

Net cash provided by (used in) financing activities

1,153.1

974.9

Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios

6.9

(18.2)

Net change in cash and cash equivalents during period

42.0

73.7

Cash and cash equivalents at beginning of year

55.3

0.0

Cash and cash equivalents at end of period

$ 97.3

$ 73.7

[1]	See note 12 for a supplementary consolidating cash flow schedule.

CONSOLIDATED SPONSORED INVESTMENT PORTFOLIOS. (Fair Value Measurements) (Details) - Fair value, measurements, recurring [Member] - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 1,606.3	$ 1,052.3
Trading investments	242.9	60.3
Total	2,422.2	1,821.6
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.0	0.0
Trading investments	17.8	15.1
Total	17.8	15.1
Consolidated sponsored investment portfolios [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	8.2	8.8
Total	521.6	291.0
Liabilities	(0.5)	(0.6)
Consolidated sponsored investment portfolios [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1.1	0.8
Total	1,428.4	1,278.5
Liabilities	(14.5)	(13.6)
Consolidated sponsored investment portfolios [Member] \| Equity securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments	511.4	281.8
Consolidated sponsored investment portfolios [Member] \| Equity securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments	508.6	325.3
Consolidated sponsored investment portfolios [Member] \| Fixed income securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments	0.0	0.0
Consolidated sponsored investment portfolios [Member] \| Fixed income securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments	895.4	918.1
Consolidated sponsored investment portfolios [Member] \| Other investments [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments	2.0	0.4
Consolidated sponsored investment portfolios [Member] \| Other investments [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments	$ 23.3	$ 34.3

STOCKHOLDERS' EQUITY. (Details) - $ / shares	3 Months Ended		9 Months Ended
STOCKHOLDERS' EQUITY. (Details) - $ / shares	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stockholders' Equity Note [Line Items]
Cash dividends declared per share	$ 0.57	$ 0.54	$ 1.71	$ 1.62
Regular cash dividend [Member]
Stockholders' Equity Note [Line Items]
Cash dividends declared per share			$ 1.71	$ 1.62

STOCK-BASED COMPENSATION. (Stock Options) (Details)	9 Months Ended
STOCK-BASED COMPENSATION. (Stock Options) (Details)	Sep. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2016 (in shares) \| shares	24,364,322
Exercised (in shares) \| shares	(5,803,025)
Forfeited (in shares) \| shares	(66,936)
Expired (in shares) \| shares	(39,631)
Outstanding at September 30, 2017 (in shares) \| shares	18,454,730
Exercisable at September 30, 2017 (in shares) \| shares	11,731,672
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price of options outstanding at December 31, 2016 (in dollars per share) \| $ / shares	$ 61.90
Weighted-average exercise price of options exercised (in dollars per share) \| $ / shares	50.09
Weighted-average exercise price of options forfeited (in dollars per share) \| $ / shares	74.41
Weighted-average exercise price of options expired (in dollars per share) \| $ / shares	76.06
Weighted-average exercise price of options outstanding at September 30, 2017 (in dollars per share) \| $ / shares	65.54
Weighted-average exercise price of options exercisable at September 30, 2017 (in dollars per share) \| $ / shares	$ 60.65

STOCK-BASED COMPENSATION. (Restricted Shares and Stock Units) (Details)	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average fair value of nonvested restricted shares and restricted stock units at December 31, 2016 (in dollars per share) \| $ / shares	$ 72.19
Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) \| $ / shares	71.73
Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) \| $ / shares	72.84
Weighted-average fair value of nonvested restricted shares and restricted stock units at September 30, 2017 (in dollars per share) \| $ / shares	72.15
Time-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average fair value of restricted shares and restricted stock units granted (in dollars per share) \| $ / shares	$ 69.60
Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at December 31, 2016 (in shares)	931,508
Vested (in shares)	(10,717)
Forfeited (in shares)	(13,007)
Nonvested at September 30, 2017 (in shares)	924,806
Restricted shares [Member] \| Time-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Grants (in shares)	17,022
Restricted shares [Member] \| Performance-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at September 30, 2017 (in shares)	14,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested shares where performance threshold has been met (in shares)	14,400
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at December 31, 2016 (in shares)	4,634,461
Vested (in shares)	(48,319)
Forfeited (in shares)	(50,996)
Nonvested at September 30, 2017 (in shares)	4,613,630
Restricted stock units [Member] \| Time-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Grants (in shares)	78,484
Restricted stock units [Member] \| Performance-based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at September 30, 2017 (in shares)	401,138
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested shares where performance threshold has been met (in shares)	401,138

STOCK-BASED COMPENSATION. (Future Stock-Based Compensation Expense) (Details) $ in Millions	Sep. 30, 2017 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Fourth quarter 2017	$ 34.3
2018	86.3
2019 through 2022	73.1
Total	$ 193.7

EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to T. Rowe Price Group	$ 390.9	$ 327.8	$ 1,150.7	$ 835.2
Less: net income allocated to outstanding restricted stock and stock unit holders	8.8	7.3	26.0	17.1
Less: net income allocated to outstanding restricted stock and stock unit holders	8.8	7.3	26.0	17.1
Net income allocated to common stockholders (basic)	382.1	320.5	1,124.7	818.1
Net income allocated to common stockholders (diluted)	$ 382.1	$ 320.5	$ 1,124.7	$ 818.1
Weighted-average common shares
Outstanding (in shares)	240.3	245.6	240.7	246.4
Outstanding assuming dilution (in shares)	244.4	250.1	244.3	251.5
Weighted-average outstanding stock options excluded (in shares)	2.1	10.3	6.7	9.9

OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Deferred Tax Benefits (Income Taxes)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net unrealized holding gains or losses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net deferred tax benefits (income taxes) on other comprehensive income (loss) before reclassifications	$ (1.9)	$ (4.0)	$ (14.4)	$ (3.6)
Total net deferred tax benefits (income taxes)	(1.9)	(4.0)	25.3	17.0
Net gains realized on dispositions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net deferred tax benefits (income taxes) on reclassifications from AOCI	0.0	0.0	30.5	20.6
Net gains recognized upon transfer to trading investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net deferred tax benefits (income taxes) on reclassifications from AOCI	0.0	0.0	9.2	0.0
Currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net deferred tax benefits (income taxes) on other comprehensive income (loss) before reclassifications	(5.2)	(1.1)	(17.1)	(3.9)
Net deferred tax benefits (income taxes) on reclassifications from AOCI	0.0	0.4	0.0	0.4
Total net deferred tax benefits (income taxes)	(5.2)	(0.7)	(17.1)	(3.5)
Total accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total net deferred tax benefits (income taxes)	$ (7.1)	$ (4.7)	$ 8.2	$ 13.5

OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances			$ 5,008.6
Other comprehensive income (loss)			(12.0)
Balances	$ 5,528.0		5,528.0
Net unrealized holding gains [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances			52.2
Other comprehensive income before reclassifications and income taxes			37.1
Reclassification adjustments recognized in non-operating income			(101.6)
Other comprehensive income (loss), before taxes			(64.5)
Net deferred tax benefits (income taxes)	(1.9)	$ (4.0)	25.3	$ 17.0
Other comprehensive income (loss)			(39.2)
Balances	13.0		13.0
Currency translation adjustments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances			(40.7)
Other comprehensive income before reclassifications and income taxes			44.4
Reclassification adjustments recognized in non-operating income			(0.1)
Other comprehensive income (loss), before taxes			44.3
Net deferred tax benefits (income taxes)	(5.2)	(0.7)	(17.1)	(3.5)
Other comprehensive income (loss)			27.2
Balances	(13.5)		(13.5)
Currency translation adjustments [Member] \| Equity method investments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances			(32.3)
Other comprehensive income before reclassifications and income taxes			4.5
Reclassification adjustments recognized in non-operating income			0.0
Other comprehensive income (loss), before taxes			4.5
Net deferred tax benefits (income taxes)			(1.6)
Other comprehensive income (loss)			2.9
Balances	(29.4)		(29.4)
Currency translation adjustments [Member] \| Consolidated sponsored investment portfolios - variable interest entities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances			(8.4)
Other comprehensive income before reclassifications and income taxes			39.9
Reclassification adjustments recognized in non-operating income			(0.1)
Other comprehensive income (loss), before taxes			39.8
Net deferred tax benefits (income taxes)			(15.5)
Other comprehensive income (loss)			24.3
Balances	15.9		15.9
Total accumulated other comprehensive income (loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances			11.5
Other comprehensive income before reclassifications and income taxes			81.5
Reclassification adjustments recognized in non-operating income			(101.7)
Other comprehensive income (loss), before taxes			(20.2)
Net deferred tax benefits (income taxes)	(7.1)	$ (4.7)	8.2	$ 13.5
Other comprehensive income (loss)			(12.0)
Balances	$ (0.5)		$ (0.5)

OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassification Adjustments) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification adjustment out of accumulated other comprehensive income
Non-operating income	$ (67.3)		$ (88.3)				$ (294.3)	$ (214.9)
Provision for income taxes	211.6		201.3				677.5	497.8
Reclassification out of accumulated other comprehensive income [Member] \| Net unrealized holding gains or losses [Member]
Reclassification adjustment out of accumulated other comprehensive income
Non-operating income							(101.6)
Reclassification out of accumulated other comprehensive income [Member] \| Net gains realized on dispositions [Member]
Reclassification adjustment out of accumulated other comprehensive income
Provision for income taxes	0.0		0.0				30.5	20.6
Reclassification out of accumulated other comprehensive income [Member] \| Net gains recognized upon transfer to trading investments [Member]
Reclassification adjustment out of accumulated other comprehensive income
Provision for income taxes	0.0		0.0				9.2	0.0
Reclassification out of accumulated other comprehensive income [Member] \| Currency translation adjustments [Member]
Reclassification adjustment out of accumulated other comprehensive income
Non-operating income	$ (0.1)		$ (1.1)				(0.1)	$ (1.1)
Provision for income taxes		$ 0.0		$ 0.4	$ 0.0	$ 0.4
Reclassification out of accumulated other comprehensive income [Member] \| Total accumulated other comprehensive income (loss) [Member]
Reclassification adjustment out of accumulated other comprehensive income
Non-operating income							(101.7)
Equity method investments [Member] \| Reclassification out of accumulated other comprehensive income [Member] \| Currency translation adjustments [Member]
Reclassification adjustment out of accumulated other comprehensive income
Non-operating income							0.0
Variable interest entities [Member] \| Reclassification out of accumulated other comprehensive income [Member] \| Currency translation adjustments [Member]
Reclassification adjustment out of accumulated other comprehensive income
Non-operating income							$ (0.1)

DELL APPRAISAL RIGHTS MATTER. (Details) - Dell appraisal rights matter [Member] - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Dec. 30, 2016	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016
Unusual or Infrequent Item [Line Items]
Nonrecurring charge, net of insurance recovery, related to Dell appraisal rights matter				$ 166.2
Court determined fair value per share at time of Dell merger (in dollars per share)				$ 17.62
Price offered per share in Dell merger (in dollars per share)				13.75
Payment per share for any shareholder perfecting appraisal rights (in dollars per share)				$ 17.62
Insurance proceeds	$ 100.0		$ 50.0
Insurance proceeds, received		$ 10.0	$ 40.0