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Document and Entity Information - $ / shares	3 Months Ended
Document and Entity Information - $ / shares	Mar. 31, 2011	Apr. 19, 2011
Document and Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 2011
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2011
Entity Registrant Name	PRICE T ROWE GROUP INC
Entity Incorporation, State Country Name	Maryland
Entity Tax Identification Number	522264646
Entity Address, Address Line One	100 East Pratt Street
Entity Address, City or Town	Baltimore
Entity Address, State or Province	Maryland
Entity Address, Postal Zip Code	21202
Entity Filer Category	Large Accelerated Filer
Entity Listing, Par Value Per Share (in dollars per share)	$ 0.20
Entity Common Stock, Shares Outstanding		259,750,308
Entity Central Index Key	0001113169
Amendment Flag	false

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 1,064.9	$ 813.1
Accounts receivable and accrued revenue	321.4	307.9
Investments in sponsored mutual funds	774.0	747.9
Debt securities held by savings bank subsidiary	188.5	184.7
Other investments	211.1	209.7
Property and equipment	551.8	560.3
Goodwill	665.7	665.7
Other assets	108.6	152.7
Total assets	3,886.0	3,642.0
Liabilities
Accounts payable and accrued expenses	80.7	79.4
Accrued compensation and related costs	96.2	71.9
Income taxes payable	88.4	33.8
Customer deposits at savings bank subsidiary	164.8	160.4
Total liabilities	$ 430.1	$ 345.5
Commitments and contingent liabilities
Stockholders' equity
Preferred stock, undesignated, $.20 par value - authorized and unissued 20,000,000 shares
Common stock, $.20 par value - authorized 750,000,000; issued 258,760,000 shares in 2010 and 259,631,000 in 2011	51.9	51.7
Additional capital in excess of par value	536.3	506.3
Retained earnings	2,713.3	2,599.4
Accumulated other comprehensive income	154.4	139.1
Total stockholders' equity	3,455.9	3,296.5
Total liabilities and stockholders' equity	$ 3,886.0	$ 3,642.0

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2010
Revenues
Investment advisory fees	$ 588.8	$ 471.8
Administrative fees	93.1	83.6
Investment income of savings bank subsidiary	1.3	1.7
Total revenues	683.2	557.1
Interest expense on savings bank deposits	0.8	0.9
Net revenues	682.4	556.2
Operating expenses
Compensation and related costs	242.9	207.7
Advertising and promotion	25.4	23.5
Depreciation and amortization of property and equipment	16.6	15.4
Occupancy and facility costs	27.7	25.7
Other operating expenses	58.3	45.2
Total operating expenses	370.9	317.5
Net operating income	311.5	238.7
Non-operating investment income	3.9	5.3
Income before income taxes	315.4	244.0
Provision for income taxes	120.8	91.0
Net income	$ 194.6	$ 153.0
Earnings per share on common stock
Basic (in dollars per share)	$ 0.75	$ 0.59
Diluted (in dollars per share)	0.72	0.57
Dividends declared per share (in dollars per share)	$ 0.31	$ 0.27

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2010
Cash flows from operating activities
Net income	$ 194.6	$ 153.0
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization of property and equipment	16.6	15.4
Stock-based compensation expense	21.4	20.1
Intangible asset amortization	0.1	0.1
Other changes in assets and liabilities	103.3	68.1
Net cash provided by operating activities	336.0	256.7
Cash flows from investing activities
Investment in UTI Asset Management Company Limited		(143.6)
Investments in sponsored mutual funds		(7.8)
Dispositions of sponsored mutual funds		2.0
Investments in debt securities held by savings bank subsidiary	(20.8)	(11.9)
Proceeds from debt securities held by savings bank subsidiary	16.2	13.3
Additions to property and equipment	(11.7)	(25.0)
Other investing activity	(0.7)	(1.4)
Net cash used in investing activities	(17.0)	(174.4)
Cash flows from financing activities
Repurchases of common stock	(31.3)	(32.7)
Common share issuances under stock-based compensation plans	26.5	30.6
Excess tax benefits from stock-based compensation plans	13.9	11.7
Dividends	(80.7)	(70.0)
Change in savings bank subsidiary deposits	4.4	(1.1)
Net cash used in financing activities	(67.2)	(61.5)
Cash and cash equivalents
Net change during period	251.8	20.8
At beginning of year	813.1	743.3
At end of period	$ 1,064.9	$ 764.1

UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2011 USD ($) shares
Statement [Line Items]
Balances	$ 3,296.5
Balances (shares) \| shares	258,760
Comprehensive Income
Net income	$ 194.6
Net unrealized holding gains, net of tax	15.7
Currency translation adjustment, net of tax	(0.4)
Total comprehensive income	209.9
Dividends	(80.7)
Common stock-based compensation plans activity
Shares issued upon option exercises	25.7
Restricted shares issued, net of shares withheld for taxes	0.0
Shares issued upon vesting of restricted stock units	0.0
Forfeiture of restricted awards	0.0
Net tax benefits	14.4
Stock-based compensation expense	21.4
Common shares repurchased	(31.3)
Balances	$ 3,455.9
Balances (shares) \| shares	259,631
Common stock [Member]
Statement [Line Items]
Balances	$ 51.7
Balances (shares) \| shares	258,760
Common stock-based compensation plans activity
Shares issued upon option exercises	$ 0.3
Shares issued upon option exercises (shares) \| shares	1,256
Restricted shares issued, net of shares withheld for taxes	$ 0.0
Restricted shares issued, net of shares withheld for taxes (shares) \| shares	122
Shares issued upon vesting of restricted stock units	$ 0.0
Shares issued upon vesting of restricted stock units (shares) \| shares	2
Forfeiture of restricted awards	$ 0.0
Forfeiture of restricted awards (shares) \| shares	(9)
Common shares repurchased	$ (0.1)
Common shares repurchased (shares) \| shares	(500)
Balances	$ 51.9
Balances (shares) \| shares	259,631
Additional capital in excess of par value [Member]
Statement [Line Items]
Balances	$ 506.3
Common stock-based compensation plans activity
Shares issued upon option exercises	25.4
Restricted shares issued, net of shares withheld for taxes	0.0
Shares issued upon vesting of restricted stock units	0.0
Forfeiture of restricted awards	0.0
Net tax benefits	14.4
Stock-based compensation expense	21.4
Common shares repurchased	(31.2)
Balances	536.3
Retained earnings [Member]
Statement [Line Items]
Balances	2,599.4
Comprehensive Income
Net income	194.6
Dividends	(80.7)
Common stock-based compensation plans activity
Balances	2,713.3
Accumulated other comprehensive income [Member]
Statement [Line Items]
Balances	139.1
Comprehensive Income
Net unrealized holding gains, net of tax	15.7
Currency translation adjustment, net of tax	(0.4)
Common stock-based compensation plans activity
Balances	$ 154.4

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES.

3 Months Ended

Mar. 31, 2011

Information about Receivables, Revenues, and Services [Abstract]

Information about Receivables, Revenues, and Services [Text Block]

NOTE 2 - INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES.

Accounts receivable from our sponsored mutual funds for advisory fees and advisory-related administrative services aggregate $154.0 million at December 31, 2010, and $162.5 million at March 31, 2011.

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

	Three months ended
	03/31/2010	03/31/2011
Sponsored mutual funds in the U.S.
Stock and blended asset	$ 262.8	$ 327.0
Bond and money market	62.6	73.5
	325.4	400.5
Other portfolios
Stock and blended asset	120.3	154.8
Bond, money market, and stable value	26.1	33.5
	146.4	188.3
Total investment advisory fees	$ 471.8	$ 588.8

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

	Average during the first quarter		As of
	2010	2011	12/31/2010	3/31/2011
Sponsored mutual funds in the U.S.
Stock and blended asset	$ 175.6	$ 220.8	$ 212.4	$ 227.8
Bond and money market	61.7	71.2	70.2	72.4
	237.3	292.0	282.6	300.2
Other portfolios
Stock and blended asset	117.5	154.6	148.2	157.3
Bond, money market and stable value	42.1	51.8	51.2	52.4
	159.6	206.4	199.4	209.7
Total assets under management	$ 396.9	$ 498.4	$ 482.0	$ 509.9

Investors that we serve are primarily domiciled in the United States of America; investment advisory clients domiciled outside the United States account for 12% of our assets under management at March 31, 2011.

Fees for advisory-related administrative services provided to our sponsored mutual funds during the first three months of the year were $65.6 million in 2010 and $75.0 million in 2011.

INVESTMENTS IN SPONSORED MUTUAL FUNDS.

3 Months Ended

Mar. 31, 2011

Available for Sale Investments [Abstract]

Investments in Sponsored Mutual Funds [Text Block]

NOTE 3 – INVESTMENTS IN SPONSORED MUTUAL FUNDS.

These investments (in millions) include:

	Aggregate	Unrealized holding	Aggregate
	cost	gains	fair value
December 31, 2010
Stock and blended asset funds	$ 281.7	$ 178.6	$ 460.3
Bond funds	248.5	39.1	287.6
	$ 530.2	$ 217.7	$ 747.9

March 31, 2011
Stock and blended asset funds	$ 281.7	$ 203.1	$ 484.8
Bond funds	248.5	40.7	289.2
	$ 530.2	$ 243.8	$ 774.0

DEBT SECURITIES HELD BY AND CUSTOMER DEPOSITS AT SAVINGS BANK SUBSIDIARY.

3 Months Ended

Mar. 31, 2011

Debt Securities Held By and Customer Deposits at Savings Bank Subsidiary [Abstract]

Debt Securities Held By and Customer Deposits at Savings Bank Subsidiary [Text Block]

NOTE 4 – DEBT SECURITIES HELD BY AND CUSTOMER DEPOSITS AT SAVINGS BANK SUBSIDIARY.

Our savings bank subsidiary holds investments in marketable debt securities, including mortgage- and other asset-backed securities, which are accounted for as available-for-sale. The following table (in millions) details the components of these investments.

	12/31/2010		3/31/2011
		Unrealized		Unrealized
		holding		holding
	Fair	gains	Fair	gains
	value	(losses)	value	(losses)
Investments with temporary impairment (50 securities in 2011) of
Less than 12 months	$ 25.0	$ (.4)	$ 35.4	$ (.5)
12 months or more	6.1	(.4)	5.3	(.2)
Total	31.1	(.8)	40.7	(.7)
Investments with unrealized holding gains	153.6	4.1	147.8	3.5
Total debt securities	$ 184.7	$ 3.3	$ 188.5	$ 2.8
Aggregate cost	$ 181.4		$ 185.7

The unrealized losses in these investments were generally caused by changes in interest rates and market liquidity, and not by changes in credit quality. We intend to hold these securities to their maturities, which generally correlate to the maturities of our customer deposits, and believe it is more-likely-than not that we will not be required to sell any of these securities before recovery of their amortized cost. Accordingly, impairment of these investments is considered temporary.

The estimated fair value of our customer deposit liability, based on discounting expected cash outflows at maturity dates that range up to five years, using current interest rates offered for deposits with the same dates of maturity, was $164.1 million at December 31, 2010, and $168.3 million at March 31, 2011.

OTHER INVESTMENTS.

3 Months Ended

Mar. 31, 2011

Other Investments [Abstract]

Other Investments [Text Block]

NOTE 5 – OTHER INVESTMENTS.

These investments (in millions) include:

	12/31/2010	3/31/2011
Cost method investments
10% interest in Daiwa SB Investments Ltd. (Japan)	$ 13.6	$ 13.6
Other investments	34.2	34.3
Equity method investments
26% interest in UTI Asset Management Company Limited (India)	154.1	155.2
Other investments	2.0	2.2
Sponsored mutual fund investments held as trading	4.8	4.8
U.S. Treasury note	1.0	1.0
Total other investments	$ 209.7	$ 211.1

FAIR VALUE MEASUREMENTS.

3 Months Ended

Mar. 31, 2011

Fair Value Measurements [Abstract]

Fair Value Measurements [Text Block]

NOTE 6 – FAIR VALUE MEASUREMENTS.

We determine the fair value of our investments using 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 the investments. There have been no transfers in or out of the levels. The following table summarizes our investments (in millions) that are recognized in our balance sheet using fair value measurements determined based on the differing levels of inputs.

	Level 1	Level 2
December 31, 2010
Cash equivalents	$ 726.9
Investments in sponsored mutual funds
Held as available-for-sale	747.9
Held as trading	4.8
Debt securities held by savings bank subsidiary	-	$ 184.7
Total	$ 1,479.6	$ 184.7

March 31, 2011
Cash equivalents	$ 973.6
Investments in sponsored mutual funds
Held as available-for-sale	774.0
Held as trading	4.8
Debt securities held by savings bank subsidiary	-	$ 188.5
Total	$ 1,752.4	$ 188.5

STOCK-BASED COMPENSATION.

3 Months Ended

Mar. 31, 2011

Stock-Based Compensation [Abstract]

Stock-Based Compensation [Text Block]

NOTE 7 – STOCK-BASED COMPENSATION.

Stock-based grants.

The following table summarizes the status of and changes in our stock option grants during the first three months of 2011.

		Weighted-
		average
		exercise
	Options	price
Outstanding at beginning of year	37,759,580	$41.34
Semiannual grants	2,894,480	$70.33
Reload grants	20,653	$67.60
New hire grants	1,000	$65.78
Exercised	(1,711,550)	$33.35
Forfeited	(158,960)	$46.48
Outstanding at end of period	38,805,203	$43.85
Exercisable at end of period	20,112,811	$37.91

The following table summarizes the status of and changes in our nonvested restricted shares and restricted stock units during the first three months of 2011.

		Restricted
	Restricted	stock	Weighted-average
	shares	units	fair value
Nonvested at beginning of year	638,532	368,201	$46.92
Granted to employees	122,575	65,650	$70.30
Vested	(875)	(1,750)	$47.75
Forfeited	(8,790)	(20,251)	$47.58
Nonvested at end of period	751,442	411,850	$50.69

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 March 31, 2011. Estimated future compensation expense will change to reflect future option grants, including reloads; future awards of unrestricted shares, restricted shares, and restricted stock units; changes in estimated forfeitures; and adjustments for actual forfeitures.

Second quarter 2011		$ 24.8
Third quarter 2011		24.3
Fourth quarter 2011		19.1
2012		59.8
2013 through 2016		58.7
Total		$ 186.7

EARNINGS PER SHARE CALCULATIONS.

3 Months Ended

Mar. 31, 2011

Earnings Per Share Calculations [Abstract]

Earnings Per Share Calculations [Text Block]

NOTE 8 – EARNINGS PER SHARE CALCULATIONS.

The following table presents the reconciliation (in millions) of our net income to net income allocated to our common stockholders and the weighted average shares (in millions) that are used in calculating the basic and the diluted earnings per share on our common stock. Weighted average common shares outstanding assuming dilution reflects the potential additional dilution, determined using the treasury stock method that could occur if outstanding stock options were exercised. The table also shows the weighted average outstanding stock options (in millions) and their average exercise price excluded from the calculation of diluted earnings per common share as the inclusion of such shares would be anti-dilutive.

	Three months ended
	3/31/2010	3/31/2011
Net income	$ 153.0	$ 194.6
Less: net income allocated to outstanding restricted stock and stock unit holders	(.6)	(.8)
Net income allocated to common stockholders	$ 152.4	$ 193.8

Weighted average common shares
Outstanding	258.2	258.7
Outstanding assuming dilution	266.2	268.5

Weighted average outstanding stock options excluded from the calculation of diluted earnings per common share	11.4	1.6
Average exercise price	$ 52.73	$ 68.64

COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME.

3 Months Ended

Mar. 31, 2011

Comprehensive Income and Accumulated Other Comprehensive Income [Abstract]

Comprehensive Income and Accumulated Other Comprehensive Income [Text Block]

NOTE 9 – COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME.

The following table presents the components (in millions) of comprehensive income.

	Three months ended
	3/31/2010	3/31/2011
Net income	$ 153.0	$ 194.6
Other comprehensive income, net of tax
Investments in sponsored mutual funds:
Net unrealized holding gains	19.6	26.1
Net gains realized on dispositions, determined using average cost	(.7)	-
Deferred income taxes	(7.4)	(10.1)
Net unrealized holding gains recognized in other comprehensive income	11.5	16.0
Debt securities held by savings bank subsidiary:
Net unrealized holding gains (losses)	.2	(.5)
Deferred tax benefits (income taxes)	(.1)	.2
Net unrealized holding gains (losses) recognized in other comprehensive income	.1	(.3)
Total net unrealized holding gains recognized in other comprehensive income	11.6	15.7
Investment in UTI Asset Management Company Limited
Change in currency translation adjustment	-	(.6)
Deferred tax benefits	-	.2
Total currency translation adjustment	-	(.4)
Total other comprehensive income	11.6	15.3
Total comprehensive income	$ 164.6	$ 209.9

The currency translation adjustment results from translating our proportionate share of the financial statements of UTI, our equity method investment, into U.S. dollars. Assets and liabilities are translated into U.S. dollars using quarter-end exchange rates, and revenues and expenses are translated using weighted-average exchange rates for the period.

The components of accumulated other comprehensive income (in millions) at March 31, 2011, are presented below.

Net unrealized holding gains on
Investments in sponsored mutual funds		$ 243.8
Debt securities held by savings bank subsidiary		2.8
		246.6
Deferred income taxes		(95.4)
Net unrealized holding gains		$ 151.2
Currency translation adjustment, net of deferred tax benefit of $1.8 million		3.2
Accumulated other comprehensive income		$ 154.4

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

3 Months Ended

Mar. 31, 2011

Information about Receivables, Revenues, and Services [Abstract]

Components of Investment Advisory Fees [Text Block]

	Three months ended
	03/31/2010	03/31/2011
Sponsored mutual funds in the U.S.
Stock and blended asset	$ 262.8	$ 327.0
Bond and money market	62.6	73.5
	325.4	400.5
Other portfolios
Stock and blended asset	120.3	154.8
Bond, money market, and stable value	26.1	33.5
	146.4	188.3
Total investment advisory fees	$ 471.8	$ 588.8

Components of Assets Under Management [Text Block]

	Average during the first quarter		As of
	2010	2011	12/31/2010	3/31/2011
Sponsored mutual funds in the U.S.
Stock and blended asset	$ 175.6	$ 220.8	$ 212.4	$ 227.8
Bond and money market	61.7	71.2	70.2	72.4
	237.3	292.0	282.6	300.2
Other portfolios
Stock and blended asset	117.5	154.6	148.2	157.3
Bond, money market and stable value	42.1	51.8	51.2	52.4
	159.6	206.4	199.4	209.7
Total assets under management	$ 396.9	$ 498.4	$ 482.0	$ 509.9

INVESTMENTS IN SPONSORED MUTUAL FUNDS. (Tables)

3 Months Ended

Mar. 31, 2011

Available for Sale Investments [Abstract]

Components of Investments in Sponsored Mutual Funds [Text Block]

	Aggregate	Unrealized holding	Aggregate
	cost	gains	fair value
December 31, 2010
Stock and blended asset funds	$ 281.7	$ 178.6	$ 460.3
Bond funds	248.5	39.1	287.6
	$ 530.2	$ 217.7	$ 747.9

March 31, 2011
Stock and blended asset funds	$ 281.7	$ 203.1	$ 484.8
Bond funds	248.5	40.7	289.2
	$ 530.2	$ 243.8	$ 774.0

DEBT SECURITIES HELD BY AND CUSTOMER DEPOSITS AT SAVINGS BANK SUBSIDIARY. (Tables)

3 Months Ended

Mar. 31, 2011

Debt Securities Held By and Customer Deposits at Savings Bank Subsidiary [Abstract]

Components of Investments in Debt Securities Held by Savings Bank Subsidiary [Text Block]

	12/31/2010		3/31/2011
		Unrealized		Unrealized
		holding		holding
	Fair	gains	Fair	gains
	value	(losses)	value	(losses)
Investments with temporary impairment (50 securities in 2011) of
Less than 12 months	$ 25.0	$ (.4)	$ 35.4	$ (.5)
12 months or more	6.1	(.4)	5.3	(.2)
Total	31.1	(.8)	40.7	(.7)
Investments with unrealized holding gains	153.6	4.1	147.8	3.5
Total debt securities	$ 184.7	$ 3.3	$ 188.5	$ 2.8
Aggregate cost	$ 181.4		$ 185.7

OTHER INVESTMENTS. (Tables)

3 Months Ended

Mar. 31, 2011

Other Investments [Abstract]

Components of Other Investments [Text Block]

	12/31/2010	3/31/2011
Cost method investments
10% interest in Daiwa SB Investments Ltd. (Japan)	$ 13.6	$ 13.6
Other investments	34.2	34.3
Equity method investments
26% interest in UTI Asset Management Company Limited (India)	154.1	155.2
Other investments	2.0	2.2
Sponsored mutual fund investments held as trading	4.8	4.8
U.S. Treasury note	1.0	1.0
Total other investments	$ 209.7	$ 211.1

FAIR VALUE MEASUREMENTS. (Tables)

3 Months Ended

Mar. 31, 2011

Fair Value Measurements [Abstract]

Fair Value Measurements Table [Text Block]

	Level 1	Level 2
December 31, 2010
Cash equivalents	$ 726.9
Investments in sponsored mutual funds
Held as available-for-sale	747.9
Held as trading	4.8
Debt securities held by savings bank subsidiary	-	$ 184.7
Total	$ 1,479.6	$ 184.7

March 31, 2011
Cash equivalents	$ 973.6
Investments in sponsored mutual funds
Held as available-for-sale	774.0
Held as trading	4.8
Debt securities held by savings bank subsidiary	-	$ 188.5
Total	$ 1,752.4	$ 188.5

STOCK-BASED COMPENSATION. (Tables)

3 Months Ended

Mar. 31, 2011

Stock-Based Compensation [Abstract]

Rollforward of Stock Options [Text Block]

		Weighted-
		average
		exercise
	Options	price
Outstanding at beginning of year	37,759,580	$41.34
Semiannual grants	2,894,480	$70.33
Reload grants	20,653	$67.60
New hire grants	1,000	$65.78
Exercised	(1,711,550)	$33.35
Forfeited	(158,960)	$46.48
Outstanding at end of period	38,805,203	$43.85
Exercisable at end of period	20,112,811	$37.91

Rollforward of Restricted Shares and Restricted Stock Units [Text Block]

		Restricted
	Restricted	stock	Weighted-average
	shares	units	fair value
Nonvested at beginning of year	638,532	368,201	$46.92
Granted to employees	122,575	65,650	$70.30
Vested	(875)	(1,750)	$47.75
Forfeited	(8,790)	(20,251)	$47.58
Nonvested at end of period	751,442	411,850	$50.69

Future Stock-Based Compensation [Text Block]

Second quarter 2011		$ 24.8
Third quarter 2011		24.3
Fourth quarter 2011		19.1
2012		59.8
2013 through 2016		58.7
Total		$ 186.7

EARNINGS PER SHARE CALCULATIONS. (Tables)

3 Months Ended

Mar. 31, 2011

Earnings Per Share Calculations [Abstract]

Earnings Per Share Calculations Table [Text Block]

	Three months ended
	3/31/2010	3/31/2011
Net income	$ 153.0	$ 194.6
Less: net income allocated to outstanding restricted stock and stock unit holders	(.6)	(.8)
Net income allocated to common stockholders	$ 152.4	$ 193.8

Weighted average common shares
Outstanding	258.2	258.7
Outstanding assuming dilution	266.2	268.5

Weighted average outstanding stock options excluded from the calculation of diluted earnings per common share	11.4	1.6
Average exercise price	$ 52.73	$ 68.64

COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Tables)

3 Months Ended

Mar. 31, 2011

Comprehensive Income and Accumulated Other Comprehensive Income [Abstract]

Total Comprehensive Income [Text Block]

	Three months ended
	3/31/2010	3/31/2011
Net income	$ 153.0	$ 194.6
Other comprehensive income, net of tax
Investments in sponsored mutual funds:
Net unrealized holding gains	19.6	26.1
Net gains realized on dispositions, determined using average cost	(.7)	-
Deferred income taxes	(7.4)	(10.1)
Net unrealized holding gains recognized in other comprehensive income	11.5	16.0
Debt securities held by savings bank subsidiary:
Net unrealized holding gains (losses)	.2	(.5)
Deferred tax benefits (income taxes)	(.1)	.2
Net unrealized holding gains (losses) recognized in other comprehensive income	.1	(.3)
Total net unrealized holding gains recognized in other comprehensive income	11.6	15.7
Investment in UTI Asset Management Company Limited
Change in currency translation adjustment	-	(.6)
Deferred tax benefits	-	.2
Total currency translation adjustment	-	(.4)
Total other comprehensive income	11.6	15.3
Total comprehensive income	$ 164.6	$ 209.9

Components of Accumulated Other Comprehensive Income [Text Block]

Net unrealized holding gains on
Investments in sponsored mutual funds		$ 243.8
Debt securities held by savings bank subsidiary		2.8
		246.6
Deferred income taxes		(95.4)
Net unrealized holding gains		$ 151.2
Currency translation adjustment, net of deferred tax benefit of $1.8 million		3.2
Accumulated other comprehensive income		$ 154.4

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Revenues and Services) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2010	Dec. 31, 2010
Statement [Line Items]
Investment advisory fees	$ 588.8	$ 471.8
Average assets under management	498,400.0	396,900.0
Period end assets under management	$ 509,900.0		$ 482,000.0
Period end assets under management from investment advisory clients domiciled outside the United States (percentage)	12.00%
Sponsored mutual funds in the U.S. [Member]
Statement [Line Items]
Investment advisory fees	$ 400.5	325.4
Average assets under management	292,000.0	237,300.0
Period end assets under management	300,200.0		282,600.0
Fees for advisory-related administrative services	75.0	65.6
Sponsored mutual funds in the U.S. [Member] \| Stock and blended asset [Member]
Statement [Line Items]
Investment advisory fees	327.0	262.8
Average assets under management	220,800.0	175,600.0
Period end assets under management	227,800.0		212,400.0
Sponsored mutual funds in the U.S. [Member] \| Bond and money market [Member]
Statement [Line Items]
Investment advisory fees	73.5	62.6
Average assets under management	71,200.0	61,700.0
Period end assets under management	72,400.0		70,200.0
Other portfolios [Member]
Statement [Line Items]
Investment advisory fees	188.3	146.4
Average assets under management	206,400.0	159,600.0
Period end assets under management	209,700.0		199,400.0
Other portfolios [Member] \| Stock and blended asset [Member]
Statement [Line Items]
Investment advisory fees	154.8	120.3
Average assets under management	154,600.0	117,500.0
Period end assets under management	157,300.0		148,200.0
Other portfolios [Member] \| Bond, money market, and stable value [Member]
Statement [Line Items]
Investment advisory fees	33.5	26.1
Average assets under management	51,800.0	$ 42,100.0
Period end assets under management	$ 52,400.0		$ 51,200.0

DEBT SECURITIES HELD BY AND CUSTOMER DEPOSITS AT SAVINGS BANK SUBSIDIARY. (Debt Securities) (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Investments with temporary impairment (50 securities in 2011) of (fair values)
Total debt securities	$ 188.5	$ 184.7
Investments with temporary impairment (50 securities in 2011) of (unrealized holding gains (losses))
Unrealized holding gains (losses)	$ 246.6
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Cause	<p class="MsoNormal" style="margin: 0in 0in 0pt;"><font style="font-size: 10pt; font-family: 'Courier New';" class="_mt"><font style="font-size: 11pt; font-family: 'Times New Roman','serif';" class="_mt">The unrealized losses in these investments were generally caused by changes in interest rates and market liquidity, and not by changes in credit quality.</font></font></p>
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other	<p style="margin-top: 0px; margin-bottom: 0px;"><font style="font-size: 10pt; font-family: 'Courier New';" class="_mt"><font style="font-size: 11pt; font-family: 'Times New Roman','serif';" class="_mt">We intend to hold these securities to their maturities, which generally correlate to the maturities of our customer deposits, and believe it is more-likely-than not that we will not be required to sell any of these securities before recovery of their amortized cost.<font class="_mt"> </font>Accordingly, impairment of these investments is considered temporary.</font></font></p>
Debt securities held by savings bank subsidiary [Member]
Investments with temporary impairment (50 securities in 2011) of (fair values)
Less than 12 months	$ 35.4	25.0
12 months or more	5.3	6.1
Total fair value of investments with temporary impairment	40.7	31.1
Fair value of investments with unrealized holding gains	147.8	153.6
Aggregate cost	185.7	181.4
Investments with temporary impairment (50 securities in 2011) of (unrealized holding gains (losses))
Less than 12 months	(0.5)	(0.4)
12 months or more	(0.2)	(0.4)
Unrealized holding losses	(0.7)	(0.8)
Unrealized holding gains	3.5	4.1
Unrealized holding gains (losses)	$ 2.8	$ 3.3
Investments with temporary impairment (number of securities)	50

OTHER INVESTMENTS. (Detail) - USD ($) $ in Millions	Mar. 31, 2011	Dec. 31, 2010
Statement [Line Items]
Sponsored mutual fund investments held as trading	$ 4.8	$ 4.8
Other investments	211.1	209.7
U.S. Treasury Note [Member]
Statement [Line Items]
U.S. Treasury Note	1.0	1.0
26% Interest in UTI Asset Management Company Limited (India) [Member]
Statement [Line Items]
Equity method investments	$ 155.2	$ 154.1
Equity method investment (ownership percentage)	26.00%	26.00%
Other equity method investments [Member]
Statement [Line Items]
Equity method investments	$ 2.2	$ 2.0
10% Interest in Daiwa SB Investments Ltd. (Japan) [Member]
Statement [Line Items]
Cost method investments	$ 13.6	$ 13.6
Cost method investment (ownership percentage)	10.00%	10.00%
Other cost method investments [Member]
Statement [Line Items]
Cost method investments	$ 34.3	$ 34.2

FAIR VALUE MEASUREMENTS. (Detail) - USD ($) $ in Millions	Mar. 31, 2011	Dec. 31, 2010
Level 1 [Member]
Statement [Line Items]
Cash equivalents	$ 973.6	$ 726.9
Total	1,752.4	1,479.6
Level 1 [Member] \| Investments in sponsored mutual funds held as trading [Member]
Statement [Line Items]
Investments	4.8	4.8
Level 1 [Member] \| Investments in sponsored mutual funds held as available for sale [Member]
Statement [Line Items]
Investments	774.0	747.9
Level 2 [Member]
Statement [Line Items]
Total	188.5	184.7
Level 2 [Member] \| Debt securities held by savings bank subsidiary [Member]
Statement [Line Items]
Investments	$ 188.5	$ 184.7

STOCK-BASED COMPENSATION. (Detail) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2011 USD ($) $ / shares shares
Stock option rollforward elements
Outstanding at beginning of year	37,759,580
Exercised	(1,711,550)
Forfeited	(158,960)
Outstanding at end of period	38,805,203
Exercisable at end of period	20,112,811
Weighted-average exercise price of options outstanding at beginning of year (in dollars per option) \| $ / shares	$ 41.34
Weighted-average exercise price of options exercised (in dollars per option) \| $ / shares	33.35
Weighted-average exercise price of options forfeited (in dollars per option) \| $ / shares	46.48
Weighted-average exercise price of options outstanding at end of period (in dollars per option) \| $ / shares	43.85
Weighted-average exercise price of options exercisable at end of period (in dollars per option) \| $ / shares	37.91
Nonvested restricted shares and restricted stock units rollforward
Weighted-average fair value of nonvested restricted shares and restricted stock units at beginning of year (in dollars per share) \| $ / shares	46.92
Weighted-average fair value of restricted shares and restricted stock units granted to employees (in dollars per share) \| $ / shares	70.30
Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) \| $ / shares	47.75
Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) \| $ / shares	47.58
Weighted-average fair value of nonvested restricted shares and restricted stock units at end of period (in dollars per share) \| $ / shares	$ 50.69
Future stock-based compensation expense
Second quarter 2011 (dollars) \| $	$ 24.8
Third quarter 2011 (dollars) \| $	24.3
Fourth quarter 2011 (dollars) \| $	19.1
2012 (dollars) \| $	59.8
2013 through 2016 (dollars) \| $	58.7
Total (dollars) \| $	$ 186.7
Semiannual grants [Member]
Stock option rollforward elements
Grants	2,894,480
Weighted-average exercise price of option grants (in dollars per option) \| $ / shares	$ 70.33
Reload grants [Member]
Stock option rollforward elements
Grants	20,653
Weighted-average exercise price of option grants (in dollars per option) \| $ / shares	$ 67.60
New hire grants [Member]
Stock option rollforward elements
Grants	1,000
Weighted-average exercise price of option grants (in dollars per option) \| $ / shares	$ 65.78
Restricted shares [Member]
Nonvested restricted shares and restricted stock units rollforward
Nonvested at beginning of year	638,532
Granted to employees	122,575
Vested	(875)
Forfeited	(8,790)
Nonvested at end of period	751,442
Restricted stock units [Member]
Nonvested restricted shares and restricted stock units rollforward
Nonvested at beginning of year	368,201
Granted to employees	65,650
Vested	(1,750)
Forfeited	(20,251)
Nonvested at end of period	411,850

EARNINGS PER SHARE CALCULATIONS. (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2010
Earnings Per Share Calculations [Abstract]
Net income	$ 194.6	$ 153.0
Less: net income allocated to outstanding restricted stock and stock unit holders	(0.8)	(0.6)
Net income allocated to common stockholders (basic)	193.8	152.4
Net income allocated to common stockholders (diluted)	$ 193.8	$ 152.4
Weighted average common shares
Outstanding (shares)	258.7	258.2
Outstanding assuming dilution (shares)	268.5	266.2
Antidilutive securities
Weighted average outstanding stock options excluded from the calculation of diluted earnings per common share (options)	1.6	11.4
Average exercise price (in dollars per option)	$ 68.64	$ 52.73

COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2010
Statement [Line Items]
Net income	$ 194.6	$ 153.0
Other comprehensive income, net of tax:
Net unrealized holding gains (losses) recognized in other comprehensive income	15.7	11.6
Investment in UTI Asset Management Company Limited
Change in currency translation adjustment	(0.6)
Deferred tax benefits	0.2
Total currency translation adjustment	(0.4)
Total other comprehensive income	15.3	11.6
Total comprehensive income	$ 209.9	164.6
Foreign Currency Translation Adjustment, Description	<font class="_mt" style="font-size: 11pt; font-family: Courier New;" size="2"> </font> <p class="MsoNormal" style="margin: 0in 0in 0pt;"><font style="font-size: 11pt;" class="_mt"><font class="_mt" style="font-family: Times New Roman;">The currency translation adjustment results from translating our proportionate share of the financial statements of UTI, our equity method investment, into U.S. dollars.<font class="_mt"> </font>Assets and liabilities are translated into U.S. dollars using quarter-end exchange rates, and revenues and expenses are translated using weighted-average exchange rates for the period.<font class="_mt"> </font></font></font></p>
Investments in sponsored mutual funds held as available for sale [Member]
Other comprehensive income, net of tax:
Net unrealized holding gains (losses)	$ 26.1	19.6
Net gains realized on dispositions, determined using average cost		(0.7)
Deferred tax benefits (income taxes)	(10.1)	(7.4)
Net unrealized holding gains (losses) recognized in other comprehensive income	16.0	11.5
Debt securities held by savings bank subsidiary [Member]
Other comprehensive income, net of tax:
Net unrealized holding gains (losses)	(0.5)	0.2
Deferred tax benefits (income taxes)	0.2	(0.1)
Net unrealized holding gains (losses) recognized in other comprehensive income	$ (0.3)	$ 0.1

COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	Mar. 31, 2011	Dec. 31, 2010
Statement [Line Items]
Net unrealized holding gains	$ 246.6
Deferred income taxes	(95.4)
Net unrealized holding gains	151.2
Currency translation adjustment	3.2
Net of deferred tax benefit of	1.8
Accumulated other comprehensive income	154.4	$ 139.1
Investments in sponsored mutual funds held as available for sale [Member]
Statement [Line Items]
Net unrealized holding gains	243.8
Debt securities held by savings bank subsidiary [Member]
Statement [Line Items]
Net unrealized holding gains	$ 2.8	$ 3.3

THE COMPANY AND BASIS OF PREPARATION.	3 Months Ended
THE COMPANY AND BASIS OF PREPARATION.	Mar. 31, 2011
The Company and Basis of Preparation [Abstract]
The Company and Basis of Preparation [Text Block]	NOTE 1 - THE COMPANY AND BASIS OF PREPARATION. T. Rowe 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 mutual funds and other investment portfolios. We also provide our investment advisory clients with related administrative services, including 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. 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 2010 Annual Report.

THE COMPANY AND BASIS OF PREPARATION. (Detail)	3 Months Ended
THE COMPANY AND BASIS OF PREPARATION. (Detail)	Mar. 31, 2011
The Company and Basis of Preparation [Abstract]
Basis of preparation	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. 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 2010 Annual Report.

DEBT SECURITIES HELD BY AND CUSTOMER DEPOSITS AT SAVINGS BANK SUBSIDIARY. (Customer Deposits) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2011	Dec. 31, 2010
Customer Deposits [Abstract]
Estimated fair value of customer deposit liability, basis for measurement	<font class="_mt" style="font-size: 11pt;"><font class="_mt" style="font-size: 11pt;"> </font></font> <div class="WordSection1"><font class="_mt" style="font-size: 10pt; font-family: 'Courier New';"> </font> <p class="MsoNormal" style="margin: 0in 0in 0pt;"><font style="font-size: 11pt;" class="_mt"><font class="_mt" style="font-family: Times New Roman;">The estimated fair value of our customer deposit liability, based on discounting expected cash outflows at maturity dates that range up to five years, using current interest rates offered for deposits with the same dates of maturity, was $164.1 million at December 31, 2010, and $168.3 million at March 31, 2011.</font></font></p></div>
Estimated fair value of customer deposit liability	$ 168.3	$ 164.1

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2011	Dec. 31, 2010
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.2	$ 0.2
Preferred stock, shares authorized	20,000,000	20,000,000
Common stock, par value (in dollars per share)	$ 0.2	$ 0.2
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	259,631,000	258,760,000

INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Receivables from Sponsored Mutual Funds) (Detail) - USD ($) $ in Millions	Mar. 31, 2011	Dec. 31, 2010
Statement [Line Items]
Accounts receivable and accrued revenue	$ 321.4	$ 307.9
Sponsored mutual funds in the U.S. [Member]
Statement [Line Items]
Accounts receivable and accrued revenue	$ 162.5	$ 154.0