Organization, Consolidation and Presentation of Financial Statements [Abstract] The company and basis of preparation Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Parent company [Member] Parent Company [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair value measurements Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair value measurements table Fair Value, Assets Measured on Recurring Basis [Table Text Block] Consolidated Sponsored Investment Portfolios [Abstract] Consolidated Sponsored Investment Portfolios [Abstract] Consolidated sponsored investment portfolios Consolidated Sponsored Investment Portfolios [Text Block] Consolidated Sponsored Investment Portfolios [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-based compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Information about Receivables, Revenues, and Services [Abstract] Information about Receivables, Revenues, and Services Information about receivables, revenues, and services Information About Receivables Revenues And Services Text Block This element is used to indicate facts reported for the continuing operations of a business entity including disclosure of receivables from sponsored mutual funds for both advisory fees and administrative services provided. This element also includes disclosure of the components of investment advisory fees and administrative fees earned as well as the components of average assets and period end assets under management. Earnings Per Share [Abstract] Earnings per share calculations Earnings Per Share [Text Block] Revenues and Services [Abstract] Revenues and Services [Abstract] Revenue and Services [Table] Revenue and Services [Table] Summarization of information required and determined to be disclosed concerning advisory service revenues and the assets from which those revenues are derived, by customer and investment mandate. Financial Support to Nonconsolidated Legal Entity [Axis] Financial Support to Nonconsolidated Legal Entity [Axis] Information by financial support arrangement provided to a nonconsolidated legal entity that is required to comply with or operate in accordance with requirements that are similar to those included in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. Financial Support to Nonconsolidated Legal Entity [Domain] Financial Support to Nonconsolidated Legal Entity [Domain] [Domain] for Information by financial support arrangement provided to a nonconsolidated legal entity that is required to comply with or operate in accordance with requirements that are similar to those included in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. Waived money market related fees [Member] Financial Support, Waived Fees [Member] Fees which are no longer required to be paid. Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Sponsored U.S. mutual funds [Member] Sponsored Mutual Funds In U S [Member] Sponsored mutual funds in the U.S. Other investment portfolios [Member] Other Portfolios [Member] Other portfolios Investment Mandate [Axis] Investment Mandate [Axis] Segregates the information included within the table to which this axis relates by the underlying investment mandate. Investment Mandate [Domain] Investment Mandate [Domain] Segregates the information included within the table to which this axis relates by the underlying investment mandate. Stock and blended asset [Member] Stock And Blended Asset [Member] Stock and blended asset [Member] Bond and money market [Member] Bond And Money Market [Member] Bond and money market [Member] Bond, money market, and stable value [Member] Bond Money Market And Stable Value [Member] Bond, money market and stable value [Member] Investment advisory services Revenues and Services [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Revenues from advisory services Investment Advisory Fees Average assets under management Assets under Management, Average Balance Period end assets under management Assets under Management, Carrying Amount Consolidated Sponsored Investment Portfolios [Table] Consolidated Sponsored Investment Portfolios [Table] Consolidated Sponsored Investment Portfolios [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Other Shareholders [Member] Other Shareholders [Member] The group of shareholders that do not have a controlling interest in an entity. A controlling interest occurs when a shareholder owns the majority of the voting interest of a voting interest entity or is deemed to be the primary beneficiary of a variable interest entity. Controlling Interest Shareholder [Member] Controlling Interest Shareholder [Member] The shareholder that has a controlling interest in an entity. A controlling interest occurs when the shareholder owns the majority of the voting interest of a voting interest entity or is deemed to be the primary beneficiary of a variable interest entity. Majority voting interest entity [Member] Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] Variable interest entity, primary beneficiary [Member] Variable Interest Entity, Primary Beneficiary [Member] Consolidated sponsored investment portfolios [Member] Consolidated Entities [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Consolidation eliminations [Member] Consolidation, Eliminations [Member] Consolidated sponsored investment portfolios Consolidated Sponsored Investment Portfolios [Line Items] [Line Items] for Consolidated Sponsored Investment Portfolios [Table] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Investments Investments Other assets Prepaid Expense and Other Assets Total assets Assets Liabilities Liabilities Net assets Net Assets Stockholders' equity including portion attributable to noncontrolling interest Stockholders' Equity Attributable to Parent Operating expenses Operating Expenses Non-operating investment income Investment Income, Nonoperating Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Investment advisory and administrative fees Investment Advisory, Management and Administrative Fees Investments [Abstract] Unconsolidated investments Investment [Table Text Block] Investments in sponsored funds reconciliation Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Continuous unrealized loss positions Schedule of Temporary Impairment Losses, Investments [Table Text Block] Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Abstract] Third quarter 2016 Share based compensation nonvested awards compensation cost to be recognized, next quarter A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized during the first quarter following the balance sheet date. Fourth quarter 2016 Share based compensation nonvested awards compensation cost to be recognized, second quarter A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized during the second quarter following the balance sheet date. Fourth quarter 2016 Share based compensation nonvested awards compensation cost to be recognized, third quarter A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized during the third quarter following the balance sheet date. 2017 Share based compensation nonvested awards compensation cost to be recognized, next calendar year A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized during the next January through December period subsequent to the balance sheet date. 2018 through 2021 Share based compensation nonvested awards compensation cost to be recognized, between second calendar year and vest date A positive value represents the unrecognized cost of awards outstanding at the balance sheet date under share-based compensation plans that will be recognized in the second January subsequent to the balance sheet date through each awards vesting date. Total Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized New accounting guidance New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Consolidation Consolidation, Policy [Policy Text Block] New Accounting Guidance [Abstract] New Accounting Guidance [Abstract] New Accounting Guidance [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting standards update 2015-02 [Member] Accounting Standards Update 2015-02 [Member] Accounting Standards Update 2015-02 Consolidation (Topic 810): Amendments to the Consolidation Analysis. Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Assets [Member] Assets [Member] Liability [Member] Liability [Member] Redeemable noncontrolling interests [Member] Redeemable Noncontrolling Interest [Member] The line item on the balance sheet representing the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated other comprehensive income [Member] AOCI Attributable to Parent [Member] Retained earnings [Member] Retained Earnings, Unappropriated [Member] New accounting guidance New Accounting Pronouncements or Change in Accounting Principle [Line Items] Number of sponsored investment portfolios initially consolidated Number Of Sponsored Investment Portfolios Initially Consolidated The number of sponsored investment portfolios initially consolidated as a result of the adoption of ASU No. 2015-02 - Consolidation (Topic 810). Reclassification of sponsored investment portfolios upon adoption of new accounting guidance on January 1, 2016 Cumulative Effect of New Accounting Principle in Period of Adoption Fair value measurements of investments held by consolidated sponsored investment portfolios [Abstract] Fair value measurements of investments held by consolidated sponsored investment portfolios [Abstract] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Equity securities Equity Securities [Member] Fixed income securities [Member] Fixed Income Investments [Member] Other investments [Member] Other than Securities Investment [Member] Fair value, measurements, recurring [Member] Fair Value, Measurements, Recurring [Member] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Trading investments Trading Securities Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total Assets, Fair Value Disclosure, Recurring Liabilities Liabilities, Fair Value Disclosure, Recurring Supplementary consolidating cash flow statement Condensed Cash Flow Statement [Table Text Block] Stockholders' Equity Note [Abstract] Stockholders' equity Stockholders' Equity Note Disclosure [Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Document Period End Date Document Period End Date Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Entity Registrant Name Entity Registrant Name Entity Incorporation, State Country Name Entity Incorporation, State Country Name Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Filer Category Entity Filer Category Entity Listing, Par Value Per Share (in dollars per share) Entity Listing, Par Value Per Share Entity Common Stock, Shares Outstanding (shares) Entity Common Stock, Shares Outstanding Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Statement Statement [Line Items] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income to net cash provided by (used in) operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization of property and equipment Depreciation, Nonproduction Stock-based compensation expense Allocated Share-based Compensation Expense Realized gains on dispositions of available-for-sale sponsored investment portfolios Available-for-sale Securities, Gross Realized Gains Net gains recognized on investments Other Noncash Income (Expense) Net change in trading securities held by consolidated sponsored investment portfolios Increase (Decrease) in Trading Securities Other changes in assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios Effect of Exchange Rate on Cash and Cash Equivalents Net change in cash and cash equivalents during period Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Components of revenues from advisory services Components of Investment Advisory Fees [Text Block] Tabular disclosure of the components of revenue recognized in the period for schedule-based fees earned for management of mutual funds based on average daily net assets and other investment management and advisory fees earned on other client portfolios based on asset valuations. Components of assets under management Components of Assets Under Management [Text Block] Tabular disclosure of the components of average assets under management and period end assets under management. Assets under management represents the market value of assets an investment adviser manages on behalf of investors and is the basis for determining investment advisory fee revenue. Components of other fees Components Of Other Fees [Table Text Block] Tabular disclosure of the components of revenue recognized in the period for other fees earned from sponsored mutual funds in the United States. Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Geographic concentration [Member] Geographic Concentration [Member] Reflects the percentage of a disclosed value in notes to the financial statements in the period from one or more specified geographic areas is to a corresponding consolidated amount. Revenues and services concentration Concentration Risk [Line Items] Concentration risk, additional characteristic Concentration Risk, Additional Characteristic Concentration risk, percentage Concentration Risk, Percentage Concentration risk, benchmark description Concentration Risk, Benchmark Description Consolidated Sponsored Investment Portfolios Statement of Cash Flows [Abstract] Consolidated Sponsored Investment Portfolios Statement of Cash Flows [Abstract] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Condensed cash flow statement Condensed Cash Flow Statements, Captions [Line Items] Net cash provided by operating activities Net cash provided by (used in) investing activities Net cash used in financing activities Income Statement [Abstract] Revenues Revenues, Net of Interest Expense [Abstract] Investment advisory fees Administrative fees Administrative Services Revenue Distribution and servicing fees Distribution Fees Net revenues Operating expenses Operating Expenses [Abstract] Compensation and related costs Labor and Related Expense Advertising and promotion Marketing and Advertising Expense Distribution and servicing costs Noninterest Expense Distribution and Servicing Fees Occupancy and facility costs Other General and Administrative Expense Other operating expenses Other Cost and Expense, Operating Nonrecurring charge related to Dell appraisal rights matter Unusual or Infrequent Item, Loss, Gross Total operating expenses Net operating income Operating Income (Loss) Non-operating income Investment Income, Nonoperating [Abstract] Other income (expenses) Other Nonoperating Income (Expense) Total non-operating income Nonoperating Income (Expense) Income before income taxes Provision for income taxes Income Tax Expense (Benefit) Net income Less: net income attributable to redeemable non-controlling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Net income attributable to T. Rowe Price Group Net Income (Loss) Attributable to Parent Earnings per share on common stock of T. Rowe Price Group Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Dividends declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Stock Options [Abstract] Stock Options [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Employee global long-term incentive plan [Member] Employee Stock Based Compensation Programs [Member] Employee Stock-Based Compensation Programs Non employee director [Member] Non Employee Director [Member] Non-employee director programs Stock-based compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Outstanding at December 31, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Non-employee director grants Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Outstanding at June 30, 2016 Exercisable at June 30, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted-average exercise price of options outstanding at December 31, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted-average exercise price of option grants Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted-average exercise price of options exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted-average exercise price of options forfeited Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted-average exercise price of options expired Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Weighted-average exercise price of options outstanding at March 31, 2016 Weighted-average exercise price of options exercisable at March 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Assets, Fair Value Disclosure [Abstract] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Sponsored portfolio trading securities [Member] Sponsored fund trading securities [Member] Sponsored fund trading securities [Member] Other trading investments [Member] Other trading investments [Member] other trading investment [Member] Available-for-sale sponsored investment portfolios Available-for-sale Securities, Equity Securities Total Other comprehensive income and accumulated other comprehensive income Comprehensive Income (Loss) Note [Text Block] Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Investments [Member] Investments [Member] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable interest entity, not primary beneficiary [Member] Variable Interest Entity, Not Primary Beneficiary [Member] Variable interest entity Variable Interest Entity [Line Items] Nonconsolidated variable interest entity investments Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets Maximum risk of loss related to nonconsolidated variable interest entities Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Equity [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of accumulated other comprehensive income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income, Causes [Axis] Reclassification Out Of Accumulated Other Comprehensive Income, Causes [Axis] Causes for reclassification adjustments out of accumulated other comprehensive income Reclassification out of Accumulated Other Comprehensive Income, Causes [Domain] Reclassification Out Of Accumulated Other Comprehensive Income, Causes [Domain] [Domain] for Causes for reclassification adjustments out of accumulated other comprehensive income Sale of individual securities [Member] Sale Of Individual Securities [Member] Sale of individual securities Net unrealized holding gains or losses [Member] Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Currency translation adjustments [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Total accumulated other comprehensive income [Member] Reclassification adjustment out of accumulated other comprehensive income Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Non-operating investment income Provision for income taxes Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss) [Line Items] Net deferred tax benefits on other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss) before Reclassifications, Tax Net deferred tax benefits on reclassifications from AOCI Reclassification from AOCI, Current Period, Tax Total net deferred tax benefits Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Components of Accumulated Other Comprehensive Income, Net of Tax [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] As previously reported [Member] Scenario, Previously Reported [Member] Net unrealized holding gains [Member] Consolidated sponsored investment portfolios - variable interest entities [Member] Equity method investments [Member] Equity Method Investee [Member] Balances Reclassification of accumulated other comprehensive income to retained earnings upon adoption of the new consolidation accounting guidance Other comprehensive income (loss) before reclassifications and income taxes OCI, before Reclassifications, before Tax, Attributable to Parent Reclassification adjustments recognized in non-operating investment income Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Other comprehensive income (loss), before taxes Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Net deferred tax benefits Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Balances Net income attributable to T. Rowe Price Group Less: net income allocated to outstanding restricted stock and stock unit holders (basic) Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Net income allocated to common stockholders (basic) Net Income (Loss) Available to Common Stockholders, Basic Net income allocated to common stockholders (diluted) Net Income (Loss) Available to Common Stockholders, Diluted Weighted-average common shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Outstanding (shares) Weighted Average Number of Shares Outstanding, Basic Outstanding assuming dilution (shares) Weighted Average Number of Shares Outstanding, Diluted Weighted-average outstanding stock options excluded (options) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Rollforward of stock options Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Rollforward of nonvested restricted shares and restricted stock units Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Future stock-based compensation expense Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Fair value measurements Fair Value Disclosures [Text Block] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Award Type [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Equity Award [Domain] Restricted shares [Member] Restricted Stock [Member] Restricted stock units [Member] Restricted Stock Units (RSUs) [Member] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Time-based [Member] Time Based [Member] Time Based [Member] Performance-based [Member] Performance Based [Member] Performance Based [Member] Schedule of Share-based Compensation Arrangement by Share-based payment award, Performance Threshold Status [Axis] Schedule of Share-based Compensation Arrangement by Share-based payment award, Performance Condition Status [Axis] Schedule of Share-based Compensation Arrangement by Share-based payment award, Performance Condition Status [Axis] Schedule of Share-based Compensation Arrangement by Share-based payment award, Performance Threshold Status [Domain] Schedule of Share-based Compensation Arrangement by Share-based payment award, Performance Condition Status [Domain] [Domain] for Schedule of Share-based Compensation Arrangement by Share-based payment award, Performance Condition Status [Axis] Performance threshold met [Member] Performance Conditions Met [Member] Performance Conditions Met [Member] Nonvested at December 31, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Grants Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested at June 30, 2016 Weighted-average fair value of nonvested restricted shares and restricted stock units at December 31, 2015 (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted-average fair value of restricted shares and restricted stock units granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted-average fair value of nonvested restricted shares and restricted stock units at March 31, 2016 (in dollars per share) Investments Investment [Text Block] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net cash provided by (used in) operating activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Purchases of available-for-sale sponsored fund investments Payments to Acquire Available-for-sale Securities, Equity Dispositions of available-for-sale sponsored fund investments Proceeds from Sale of Available-for-sale Securities, Equity Net cash of sponsored investment portfolios on consolidation (deconsolidation) Net Cash Flow For Consolidation Deconsolidation Of Sponsored Investment Portfolios The net cash inflow (outflow) associated with the consolidation (deconsolidation) of sponsored investment portfolios. Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Other investing activity Payments for (Proceeds from) Other Investing Activities Net cash provided by (used in) investing activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Repurchases of common stock Payments for Repurchase of Common Stock Common share issuances under stock-based compensation plans Proceeds from stock options exercised, net of payments for repurchase of common stock for employee tax withholding obligations and strike price The cash inflow associated with the amount received from holders exercising their stock options net of 1) shares swapped by the employee to pay the cost of related employee stock option awards and 2) cash outflows paid by the company to cover an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. A positive value represents cash inflows in excess of cash outflows listed. A negative value represents cash outflows in excess of the cash inflow described. Excess tax benefits from stock-based compensation plans Excess Tax Benefit from Share-based Compensation, Financing Activities Dividends paid to common stockholders of T. Rowe Price Group Payments of Ordinary Dividends, Common Stock Net subscriptions received from redeemable non-controlling interest holders Proceeds from (Payments to) Noncontrolling Interests Net cash provided by (used in) financing activities Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment portfolios Net change in cash and cash equivalents during period Earnings per share reconciliation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Anti-dilutive securities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Accounts receivable and accrued revenue Accounts Receivable, Net Total assets Property and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill, Gross LIABILITIES Liabilities [Abstract] Accounts payable and accrued expenses Accounts Payable and Other Accrued Liabilities Total liabilities Accrued compensation and related costs Employee-related Liabilities Income taxes payable Accrued Income Taxes Commitments and contingent liabilities Commitments and Contingencies Redeemable non-controlling interests Redeemable Noncontrolling Interest, Equity, Carrying Amount STOCKHOLDERS’ EQUITY Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, undesignated, $.20 par value – authorized and unissued 20,000,000 shares Preferred Stock, Value, Issued Common stock, $.20 par value - authorized 750,000,000; issued 250,469,000 shares at December 31, 2015, and 248,502,000 at June 30, 2016 Common Stock, Value, Issued Additional capital in excess of par value Additional Paid in Capital, Common Stock Retained earnings Retained Earnings, Unappropriated Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Total liabilities, redeemable non-controlling interests, and stockholders’ equity Liabilities and Equity Condensed Balance Sheet [Table Text Block] Condensed Balance Sheet [Table Text Block] Condensed Income Statement [Table Text Block] Condensed Income Statement [Table Text Block] Cash flows of consolidated sponsored investment portfolios table Fair value of investments held by consolidated investment portfolios measurements table Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Investment [Table] Investment [Table] Investment, Name [Axis] Sponsored portfolio equity method investments [Member] Sponsored fund equity method investments [Member] Sponsored fund equity method investments [Member] 26% interest in UTI Asset Management Company Limited (India) [Member] UTI Asset Management Company India [Member] UTI Asset Management Company India [Member] Investment partnerships [Member] Other Equity Method Investments [Member] Other equity method investments Investments Investment [Line Items] Equity method investments Equity Method Investments Equity method investment (ownership percentage) Equity Method Investment, Ownership Percentage Cost method investments Cost Method Investments U.S. Treasury note Held-to-maturity Securities Total Deconsolidation value Deconsolidation Value2 Represents the carrying value of the assets (liabilities or redeemable noncontrolling interest) deconsolidated during the period as valued on the date that the parent no longer had a controlling financial interest in the subsidiary. Impact of the components of other comprehensive income (loss) on deferred tax benefit (income tax) Comprehensive Income (Loss) [Table Text Block] Changes in accumulated other comprehensive income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Common stock [Member] Common Stock [Member] Additional capital in excess of par value [Member] Additional Paid-in Capital [Member] Balances (shares) Common Stock, Shares, Outstanding Consolidation of sponsored investment portfolios upon adoption of new accounting guidance on January 1, 2016 portion attributable to redeemable noncontrolling interests Net income Net income attributable to redeemable non-controlling interests Other comprehensive income (loss), net of tax, portion attributable to parent Other comprehensive income (loss), net of tax, portion attributable to noncontrolling interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Dividends declared Dividends, Cash Common stock-based compensation plans activity Share-based Compensation [Abstract] Shares issued upon option exercises (shares) Stock Issued During Period Stock Options Exercised Net Of Shares For Tax Withholding Strike Price A positive value represents the number of shares of stock issued during the period as a result of option exercises, net of shares withheld for the payment of withholding taxes and shares swapped for payment of strike price. Shares issued upon option exercises Stock Issued During Period Value Stock Options Exercised Net of Tax Withholdings Strike Price A positive value represents the value of stock issued as a result of the exercise of stock options less values of underlying shares swapped by the employee to pay the cost of the related stock option award and withheld to pay related income tax obligations. Restricted shares issued, net of shares withheld for taxes (shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Restricted shares issued, net of shares withheld for taxes Restricted Stock, Value, Shares Issued Net of Tax Withholdings Shares issued upon vesting of restricted stock units, net of shares withheld for taxes (shares) Stock Issued During Period, Shares, Other Shares issued upon vesting of restricted stock units, net of shares withheld for taxes Stock Issued During Period, Value, Other Forfeiture of restricted awards (shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Forfeiture of restricted awards Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Net tax benefits Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Common shares repurchased (shares) Stock Repurchased During Period, Shares Common shares repurchased Stock Repurchased During Period, Value Net subscriptions into sponsored investment portfolios Subscription From Redemption Distribution To Noncontrolling Interest A positive value represents subscriptions net of redemptions and distributions to non-controlling interest holders of a less than wholly owned subsidiary. A negative value represents redemptions and distributions paid to non-controlling interest holders net of subscriptions received. Net deconsolidations of sponsored investment portfolios Noncontrolling Interest, Decrease from Deconsolidation Balances (shares) Balances attributable to redeemable non-controlling interests Extraordinary and Unusual Items [Abstract] Dell appraisal rights matter Unusual or Infrequent Items Disclosure [Text Block] Stockholders' Equity Note [Table] Stockholders' Equity Note [Table] Stockholders' Equity Note [Table] Dividends [Axis] Dividends [Axis] Dividends [Domain] Dividends [Domain] Regular cash dividend [Member] Ordinary Dividend [Member] Ordinary Dividend [Member] Special cash dividend [Member] Special Dividend [Member] Special Dividend [Member] Dividends Stockholders' Equity Note [Line Items] [Line Items] for Stockholders' Equity Note [Table] Cash dividends declared per share Cash dividends paid per share Common Stock, Dividends, Per Share, Cash Paid Accounts Receivable, Net [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Receivables from sponsored mutual funds Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts receivable for advisory fees and advisory-related administrative services Available-for-sale Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Stock and blended asset funds [Member] Equity Funds [Member] Bond funds [Member] Fixed Income Funds [Member] Schedule of available-for-sale securities Schedule of Available-for-sale Securities [Line Items] Aggregate cost Available-for-sale Equity Securities, Amortized Cost Basis Unrealized holding gains Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax Unrealized holding losses Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax Aggregate fair value Fund holdings with temporary unrealized losses shorter than 12 months (number of securities) Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year Fund holdings with temporary unrealized losses longer than 12 months (number of securities) Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year Fund holdings with temporary unrealized holding losses (number of securities) Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Unrealized holding losses on fund holdings that were in a continuous loss for less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Unrealized holding losses on fund holdings that were in a continuous loss for greater than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Unrealized holding losses for less than 12 months at period end are attributable to fund holdings with an aggregate fair value of Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Unrealized holding losses for longer than 12 months at period end are attributable to fund holdings with an aggregate fair value of Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Unrealized holding losses at period end are attributable to fund holdings with an aggregate fair value of Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Unusual or Infrequent Item [Table] Unusual or Infrequent Item [Table] Unusual or Infrequent Item [Axis] Unusual or Infrequent Item [Axis] Unusual or Infrequent Item [Domain] Unusual or Infrequent Item [Domain] Dell appraisal rights matter [Member] Dell appraisal rights matter [Member] Dell appraisal rights matter[Member] Unusual or Infrequent Item [Line Items] Unusual or Infrequent Item [Line Items] Court determined fair value per share Court determined fair value per share The fair value per share of a company at the time of a merger that was determined by a court during the period. Price offered per share Price offered per share The price per share offered in a merger by the buyer, that was determined by a court to be too low during the period. Payment per share Payment per share The amount per share that was determined to be paid to affected clients during the period which was intended to make them whole for the voting discrepancy that resulted in the denial of their appraisal rights. Supplementary consolidating cash flow statement Additional Financial Information Disclosure [Text Block] Other fees earned from sponsored U.S. mutual funds Administrative fees Distribution and servicing fees Statement of Comprehensive Income [Abstract] Other comprehensive loss Other Comprehensive Income (Loss), before Tax [Abstract] Net unrealized holding gains (losses) on available-for-sale investments Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Reclassification adjustments recognized in non-operating investment income: net gains realized on dispositions determined using average cost Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Total net unrealized holding gains (losses) recognized in other comprehensive income Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax Total currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Other comprehensive loss before income taxes Other Comprehensive Income (Loss), before Tax Total other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: comprehensive income (loss) attributable to redeemable non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to T. Rowe Price Group Comprehensive Income (Loss), Net of Tax, Attributable to Parent Assets of consolidated sponsored investment portfolios Liabilities of consolidated sponsored investment portfolios Stockholders' equity Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Statement of Cash Flows (Parenthetical) [Abstract] Statement of Cash Flows (Parenthetical) [Abstract]