Grants (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Document Type Document Type ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Aggregate intrinsic value of in-the-money options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Other income (loss) Other Nonoperating Income (Expense) Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Maximum risk of loss related to investments in variable interest entities Schedule of Variable Interest Entities [Table Text Block] First quarter 2021 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter One Of Next Fiscal Year Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter One Of Next Fiscal Year Other clients Other Clients [Member] Other Clients [Member] Changes in accumulated other comprehensive income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] 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 Condensed Income Statement [Table] Condensed Income Statement [Table] Distribution and servicing fees Distribution Service [Member] Leases Lessee, Leases [Policy Text Block] Common shares repurchased (shares) Stock Repurchased During Period, Shares OTHER DISCLOSURES Other Disclosures [Text Block] Other Disclosures [Text Block] Vested stock units (in shares) Vested Restricted Stock Units The number of vested but unsettled awards (other than option plans) for which the company is obligated to issue equity instruments or transfer assets to a non-employee director. For these awards the non-employee director has satisfied the service or performance criteria necessary to gain title to the underlying shares but will not receive the shares until separation from the board. Receivable for investment advisory and administrative fees Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Uncollected Investment Advisory and Administrative Fees, Amount Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Uncollected Investment Advisory and Administrative Fees, Amount Statistical Measurement [Domain] Statistical Measurement [Domain] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Third quarter 2021 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter Three Of Next Fiscal Year Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter Three Of Next Fiscal Year Compensation and related costs Labor and Related Expense Security Exchange Name Security Exchange Name Investment partnerships and other investments Investment Partnership and Other Investments [Member] Investment Partnership and Other Investments [Member] Net operating income Operating Income (Loss) Reclassification out of accumulated other comprehensive income Reclassification out of Accumulated Other Comprehensive Income [Member] Weighted-average fair value of nonvested restricted shares and restricted stock units, beginning balance (in dollars per share) Weighted-average fair value of nonvested restricted shares and restricted stock units, ending balance (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 Restricted Cash and Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] Other Investments Other Investments Commitments and contingent liabilities Commitments and Contingencies Performance-based Share-based Payment Arrangement, Tranche Two [Member] Repurchases of common stock Payments for Repurchase of Common Stock ASSETS Assets [Abstract] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Axis] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Graded vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Furniture and other equipment Furniture and Fixtures [Member] Entity Address, State or Province Entity Address, State or Province Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Cash paid included in measurement of operating lease liabilities Operating Lease, Payments Other comprehensive income (loss) before income taxes Other Comprehensive Income (Loss), before Tax OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME Comprehensive Income (Loss) Note [Text Block] Unusual or Infrequent Item, or Both [Line Items] Unusual or Infrequent Item, or Both [Line Items] Operating lease assets Operating Lease, Right-of-Use Asset Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Net change in securities held by consolidated T. Rowe Price investment products Increase (Decrease) In Trading Securities, Consolidated Sponsored Investment Portfolios Increase (Decrease) in Trading Securities, Consolidated Sponsored Investment Portfolios Equity and blended assets Stock And Blended Asset [Member] Stock and blended asset [Member] Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Accounting standards update 2016-01 Accounting Standards Update 2016-01 [Member] Cash equivalent investments in T. Rowe Price money market mutual funds Money Market Funds, at Carrying Value 2021 Lessee, Operating Lease, Liability, to be Paid, Year One Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Reversal of charge related to Dell appraisal rights matter Unusual Or Infrequent Item, Or Both, Loss, Reversal Unusual Or Infrequent Item, Or Both, Loss, Reversal 2024 Lessee, Operating Lease, Liability, to be Paid, Year Four Unfunded capital commitments Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Unfunded Capital Commitments, Amount Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Unfunded Capital Commitments, Amount Total Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Customer [Axis] Customer [Axis] State and local Current State and Local Tax Expense (Benefit) Beginning balances (in shares) Ending balances (in shares) Shares, Outstanding Preferred stock, undesignated, $.20 par value—authorized and unissued 20,000,000 shares Preferred Stock, Value, Issued Insurance proceeds Unusual or Infrequent Item, or Both, Insurance Proceeds Total operating expenses Operating expenses reflected in net operating income Operating expenses Operating Expenses Asset impairments Deferred Income Tax Expense (Benefit), Related to Asset Impairments Deferred Income Tax Expense (Benefit), Related to Asset Impairments Stock issued, restricted stock award, net of shares withheld for taxes (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net Of Shares Withheld For Taxes Stock Issued During Period, Shares, Restricted Stock Award, Net Of Shares Withheld For Taxes Exercisable at current period-end (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Cash flows of consolidated T. Rowe Price investment portfolios Consolidated Sponsored Investment Portfolios Condensed Cash Flow Statement [Table Text Block] Tabular disclosure of condensed cash flow statement of consolidated sponsored investment portfolios. Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Other investing activity Payments for (Proceeds from) Other Investing Activities 2017 Non-Employee Director Equity Plan 2017 Non-Employee Director Equity Plan [Member] 2017 Non-Employee Director Equity Plan [Member] Operating lease assets Deferred Tax Liabilities, Operating Lease Assets Deferred Tax Liabilities, Operating Lease Assets Stock-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Advertising and promotion Marketing and Advertising Expense Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products FX impact on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cumulative Effect, Period of Adoption, Adjusted Balance Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Net gains recognized on other investments Net Gains (Losses) Recognized on Investments Net Gains (Losses) Recognized on Investments Net revenues Investment advisory and administrative fees Net revenues Revenue from Contract with Customer, Excluding Assessed Tax Measurement Frequency [Domain] Measurement Frequency [Domain] Compensation and related costs Compensation and Related Costs [Member] Compensation and Related Costs [Member] Concentration risk, percentage Concentration Risk, Percentage Geographical [Domain] Geographical [Domain] Award expiration term Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Statement [Line Items] Statement [Line Items] Net tax benefits reducing income tax provision Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit (Tax Shortfall), Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit (Tax Shortfall), Amount Information about Receivables, Revenues, and Services [Abstract] Information about Receivables, Revenues, and Services [Abstract] Information about Receivables, Revenues, and Services Director plans Director Plans [Member] Director Plans Currency translation adjustments: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract] Entity Voluntary Filers Entity Voluntary Filers Statement [Table] Statement [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Fixed income securities Fixed Income Investments [Member] Nonrecurring charge related to Maryland state tax legislation Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Unusual or Infrequent Items, or Both [Abstract] Unusual or Infrequent Items, or Both [Abstract] Supplemental Savings Plan Deferred Bonus [Member] Investment carrying values Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Investment Carrying Values, Amount Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Investment Carrying Values, Amount Investments held at fair value Marketable Securities, Policy [Policy Text Block] Entity Small Business Entity Small Business Consolidation Consolidation, Policy [Policy Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Weighted-average remaining contractual term in years, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Dividends earned on money market mutual funds Dividend distribution Investment Income, Dividend Operating results of consolidated T. Rowe Price investment portfolios Consolidated Sponsored Investment Portfolios Condensed Income Statement [Table Text Block] Tabular disclosure of condensed income statement for consolidated sponsored investment portfolios. Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Net assets of consolidated T. Rowe Price investment portfolios Consolidated Sponsored Investment Portfolios Condensed Balance Sheet [Table Text Block] Tabular disclosure of condensed balance sheet for consolidated sponsored investment portfolios. Amendment Flag Amendment Flag Earnings per share reconciliation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Deferred tax assets Deferred Tax Assets, Gross [Abstract] Summary of fair value measurements Fair Value, Assets Measured on Recurring Basis [Table Text Block] Shares available for future grant (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Forfeiture of restricted awards (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Entity Central Index Key Entity Central Index Key Measurement Frequency [Axis] Measurement Frequency [Axis] Administrative fees Administrative Service [Member] Maximum risk of loss related to nonconsolidated variable interest entities Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Equity method investments Equity Method Investments [Policy Text Block] Redeemable non-controlling interest 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. Other investments Other than Securities Investment [Member] Accounting Standards Update 2018-02 Accounting Standards Update 2018-02 [Member] Accounts payable and accrued expenses Accounts Payable and Other Accrued Liabilities Geographical [Axis] Geographical [Axis] Reclassification adjustment recognized in the provision for income taxes upon deconsolidation of T. Rowe Price investment product Reclassification from AOCI, Current Period, Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Employee stock purchase Employee Stock [Member] Deferral percentage of cash incentive compensation Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage Deferred Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage Deferred Rollforward of nonvested restricted shares and restricted stock units Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Discretionary investments Sponsored Investment Portfolios, Discretionary Investments [Member] Sponsored Investment Portfolios, Discretionary Investments Income Statement Location [Axis] Income Statement Location [Axis] Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest Deconsolidation Value Deconsolidation Value Entity Common Stock, Shares Outstanding (shares) Entity Common Stock, Shares Outstanding Income Statement Location [Domain] Income Statement Location [Domain] 2022 Lessee, Operating Lease, Liability, to be Paid, Year Two State and local jurisdiction State and Local Jurisdiction [Member] Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES Information About Receivables Revenues And Services [Text Block] Information About Receivables Revenues And Services [Text Block] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] U.S. federal Current Federal Tax Expense (Benefit) Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Three Plan Name [Axis] Plan Name [Axis] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Concentration Risk [Table] Concentration Risk [Table] Total assets Assets Multi-asset Multi-Asset [Member] Multi-Asset Restricted stockholders' equity Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Reclassification adjustment of stranded taxes on available-for-sale investments resulting from U.S. tax law changes enacted on December 22, 2017 Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect BASIS OF PREPARATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Nonvested, beginning balance (in shares) Nonvested, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Title of 12(b) Security Title of 12(b) Security Subsequent Event Type [Axis] Subsequent Event Type [Axis] Net deconsolidations of T. Rowe Price investment products Noncontrolling Interest, Decrease from Deconsolidation Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Investment advisory clients Investment Advisory Clients [Member] Investment Advisory Clients [Member] Supplemental Savings Plan, minimum deferral period Deferred Compensation Arrangement with Individual, Initial Minimum Contractual Term Deferred Compensation Arrangement with Individual, Initial Minimum Contractual Term Net unrealized holding gains recognized in income Deferred Tax Liabilities, Net Unrealized Holding Gains Recognized in Income Deferred Tax Liabilities, Net Unrealized Holding Gains Recognized in Income Vesting [Domain] Vesting [Domain] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Schedules of provision for income taxes and deferred income taxes (tax benefits) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income Equity Securities, FV-NI, Unrealized Gain (Loss) Product and Service [Axis] Product and Service [Axis] Total liabilities Liabilities Liabilities Investment Type [Axis] Investment Type [Axis] Components of revenues from advisory services Components of Investment Advisory Fees [Table 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. Technology, occupancy, and facility costs Technology, Depreciation, Occupancy, And Facility Expenses Technology, Depreciation, Occupancy, And Facility Expenses Less: imputed interest to be recognized in lease expense Lessee, Operating Lease, Liability, Undiscounted Excess Amount Outside U.S. Non-US [Member] Unsettled common stock repurchases liability Unsettled Common Stock Repurchases Liabilities Unsettled Common Stock Repurchases Liabilities Reclassification adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net income allocated to common stockholders (basic) Net Income (Loss) Available to Common Stockholders, Basic Level 1 Level 1 Fair Value, Inputs, Level 1 [Member] Operating lease expense Operating Lease, Expense Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Other changes in assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS Consolidated Sponsored Investment Portfolios [Text Block] Consolidated Sponsored Investment Portfolios [Text Block] Additional capital in excess of par value Additional Paid-in Capital [Member] Other assets Other Assets Schedule of supplementary quarterly financial data Quarterly Financial Information [Table Text Block] Seed capital Sponsored Investment Portfolios, Seed Capital [Member] Sponsored Investment Portfolios, Seed Capital Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Assets Assets [Member] Investment in UTI Asset Management Company Limited (India) UTI Asset Management Company India [Member] UTI Asset Management Company India [Member] Leased land Leased Land [Member] Leased Land [Member] Adjustments to reconcile net income to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] 2020 Long-Term Incentive Plan and the 2017 Non-Employee Director Equity Plan 2020 Long-Term Incentive Plan And the 2017 Non-Employee Director Equity Plan [Member] 2012 Long-Term Incentive Plan And the 2017 Non-Employee Director Equity Plan [Member] Equity method investments Equity Method Investments Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Variable charges related to operating leases not included in measurement of lease liability Variable Lease, Cost Period end assets under management Assets under Management, Carrying Amount Tax refund receivables Income Taxes Receivable Reclassification adjustment recognized in the provision for income taxes upon deconsolidation of T. Rowe Price investment product Accumulated Foreign Currency Adjustment Attributable To Parent, Deconsolidation [Member] Accumulated Foreign Currency Adjustment Attributable To Parent, Deconsolidation Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Variable interest entity, not primary beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Subsequent Event Subsequent Event [Member] Other items Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Weighted-average exercise price of options outstanding, beginning balance (in dollars per share) Weighted-average exercise price of options outstanding, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Comprehensive income Comprehensive Income, Policy [Policy Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Concentration Risk Type [Axis] Concentration Risk Type [Axis] Property and equipment, gross Property, Plant and Equipment, Gross Operating lease liabilities Deferred Tax Assets, Operating Lease Liabilities Deferred Tax Assets, Operating Lease Liabilities Changes in tax positions related to current year Unrecognized Tax Benefits, Increase (Decrease) Resulting from Current Period Tax Positions Unrecognized Tax Benefits, Increase (Decrease) Resulting from Current Period Tax Positions Retained earnings Retained Earnings, Unappropriated [Member] Dell appraisal rights matter Dell appraisal rights matter [Member] Dell appraisal rights matter[Member] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Income Statement [Abstract] Income Statement [Abstract] AOCI Total accumulated other comprehensive income AOCI Attributable to Parent [Member] Reclassification adjustment recognized upon partial disposition of equity method investment Accumulated Foreign Currency Adjustment Attributable To Parent, Partial Disposition Of Equity Method Investment [Member] Accumulated Foreign Currency Adjustment Attributable To Parent, Partial Disposition Of Equity Method Investment Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] VIE Consolidated T. Rowe Price investment products - variable interest entities Variable Interest Entity, Primary Beneficiary [Member] Restricted stock units issued as dividend equivalents Dividend, Share-based Payment Arrangement, Paid-in-Kind Basis of preparation - use of estimates Use of Estimates, Policy [Policy Text Block] Nonvested shares where performance threshold has been met (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Performance Threshold Met, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Performance Threshold Met, Number Income Tax Authority [Domain] Income Tax Authority [Domain] Fair values of investments held by consolidated T. Rowe Price investment portfolios Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis for Consolidated Sponsored Investment Portfolios [Table Text Block] Tabular disclosure of assets and liabilities of consolidated sponsored investment portfolios that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Investments Investments, Fair Value Disclosure Net impact of deconsolidation and consolidation on condensed consolidated balance sheets and income statements Schedule of Deconsolidation Impacts on Financial Statements [Table Text Block] Schedule of Deconsolidation Impacts on Financial Statements [Table Text Block] Consolidated Entities [Axis] Consolidated Entities [Axis] Comprehensive income attributable to T. Rowe Price Group Comprehensive Income (Loss), Net of Tax, Attributable to Parent Consolidated Investments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Accrued compensation Deferred Income Tax Expense (Benefit), Related to Accrued Compensation Deferred Income Tax Expense (Benefit), Related to Accrued Compensation Schedule of effective income tax rate reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table] Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table] Additions to property and equipment Payments to Acquire Property, Plant, and Equipment City Area Code City Area Code Consolidation Items [Domain] Consolidation Items [Domain] Nonrecurring recoveries related to Dell appraisal rights matter Unusual or Infrequent Item, or Both, Net of Insurance Proceeds Income Tax Authority [Axis] Income Tax Authority [Axis] Document Period End Date Document Period End Date Income tax provision related to the tax law changes Tax Cuts and Jobs Act, Income Tax Expense (Benefit) Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Maximum amount of cash incentive compensation senior officers elected to defer Deferred Compensation Arrangement With Individual, Cash Awards Granted, Amount Deferred Deferred Compensation Arrangement with Individual, Maximum Cash Award Limit Restricted shares and restricted stock units Restricted Stock And Restricted Stock Units [Member] Shares and stock units that an entity has not yet issued because the agreed-upon consideration, such as employee services, has not yet been received. Shares of common stock authorized for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Computer and communications software and equipment Computer And Communications Software And Equipment [Member] Long lived, depreciable assets used in the creation, maintenance, and utilization of information systems which include computers and peripherals, as well as capitalized costs of purchased software applications and capitalized costs to develop software for long-term internal use. Accrued compensation and related costs Employee-related Liabilities Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information Disclosure [Abstract] Net deferred tax benefits (income taxes) on other comprehensive income before reclassifications Other Comprehensive Income (Loss) before Reclassifications, Tax Common shares repurchased Stock Repurchased During Period, Value Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Income Tax Reform [Line Items] Income Tax Reform [Line Items] [Line Items] for Income Tax Reform [Table] Asset impairments Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses Investments held at fair value Equity Securities, FV-NI Cover [Abstract] Cover [Abstract] Net investments in T. Rowe Price investment products used to economically hedge supplemental savings plan liability Proceeds from (Payments for) Trading Securities, Short-term Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Unaudited) Quarterly Financial Information [Text Block] Weighted-average fair value of restricted shares and restricted stock units nonvested dividend equivalents granted to non-employee directors (in dollars per share) Share-based Compensation Arrangement By Share-based Payment Award, Nonvested Dividend Equivalents Granted To Non-Employee Directors, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement By Share-based Payment Award, Nonvested Dividend Equivalents Granted To Non-Employee Directors, Weighted Average Grant Date Fair Value Equity method investments Equity method investments Equity Method Investee [Member] Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Estimated useful life Property, Plant and Equipment, Useful Life Common shares authorized for future repurchase (shares) Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] 2022 through 2026 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized From Second Fiscal Year to Vesting Unrecognized cost of unvested share-based compensation awards to be recognized in the second fiscal year through vesting period. LEASES Lessee, Operating Leases [Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Investments Total Investments Net deferred tax asset Deferred Tax Assets, Net Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Statement, Equity Components [Axis] Equity Components [Axis] Equity Components [Axis] Restricted shares Restricted Stock [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Attributable to T. Rowe Price Group Investment, Sponsored Investment Portfolios, Attributable to Parent Represents the reporting entity's interest in consolidated sponsored investment portfolios. This amount is eliminated in consolidation. Total deferred tax assets Deferred Tax Assets, Gross Balance Sheet Location [Domain] Balance Sheet Location [Domain] Unrealized holding gains recognized in non-operating income Deferred Income Tax Expense (Benefit), Related to Unrealized Holding Gains Recognized in Income Deferred Income Tax Expense (Benefit), Related to Unrealized Holding Gains Recognized in Income Land Land [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Depreciation, amortization and impairment of property and equipment Depreciation, Amortization And Impairment Of Property And Equipment Depreciation, Amortization And Impairment Of Property And Equipment Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Assets under management Assets Under Management [Member] Assets Under Management [Member] Comptroller of Maryland Comptroller Of Maryland [Member] Comptroller Of Maryland [Member] 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 Income taxes payable Accrued Income Taxes Entity Interactive Data Current Entity Interactive Data Current Net cash of T. Rowe Price investment products 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. Weighted-average exercise price of options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Revenues Revenues [Abstract] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] STOCKHOLDERS’ EQUITY Stockholders' Equity Note Disclosure [Text Block] Components of assets under management Components of Assets Under Management [Table 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. Rollforward of stock options Share-based Payment Arrangement, Option, Activity [Table Text Block] Product-related costs Product-Related And Client Servicing Expenses Product-Related And Client Servicing Expenses Stock-based compensation Share-based Payment Arrangement [Policy Text Block] Customer [Domain] Customer [Domain] Unusual or Infrequent Item, or Both [Axis] Unusual or Infrequent Item, or Both [Axis] Foreign Current Foreign Tax Expense (Benefit) Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Consolidated Sponsored Investment Portfolios [Abstract] Consolidated Sponsored Investment Portfolios [Abstract] Consolidated Sponsored Investment Portfolios [Abstract] Additional capital in excess of par value Additional Paid in Capital, Common Stock Entity Registrant Name Entity Registrant Name Subsequent Event Type [Domain] Subsequent Event Type [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Weighted-average discount rate on operating leases Operating Lease, Weighted Average Discount Rate, Percent Concentration Risk [Line Items] Concentration Risk [Line Items] Currency translation adjustment Deferred Tax Assets, Unrealized Currency Losses Total deferred tax liabilities Deferred Tax Liabilities, Gross Advertising Advertising Cost [Policy Text Block] Supplemental savings plan liability Deferred Compensation Arrangement with Individual, Recorded Liability Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Future stock-based compensation expense Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Net unrealized holding gains on investments held as available-for-sale Deferred Tax Liabilities, Net Unrealized Holding Gains On Investments Held As Available For Sale Deferred Tax Liabilities, Net Unrealized Holding Gains On Investments Held As Available For Sale Consolidation Items [Axis] Consolidation Items [Axis] Total currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Deferred tax liabilities for intended repatriation Deferred Tax Liabilities For Intended Repatriation Deferred Tax Liabilities For Intended Repatriation Equity securities Equity Securities [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Total future undiscounted cash flows Lessee, Operating Lease, Liability, to be Paid Other Deferred Tax Assets, Other Net gains (losses) on consolidated investment products Investment Income, Nonoperating, Consolidated Sponsored Investment Portfolios Investment Income, Nonoperating, Consolidated Sponsored Investment Portfolios Net interest payable related to unrecognized tax benefits Unrecognized Tax Benefits, Interest on Income Taxes Accrued Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Previously taxed earnings and profits of foreign subsidiaries with unremitted earnings Previously Taxed Earnings And Profits Of Foreign Subsidiaries With Unremitted Earnings Previously Taxed Earnings And Profits Of Foreign Subsidiaries With Unremitted Earnings Impact of the components of other comprehensive income on deferred tax benefits (income taxes) Comprehensive Income (Loss) [Table Text Block] Stock-based compensation Deferred Income Tax Expense (Benefit), Related to Stock-Based Compensation Deferred Income Tax Expense (Benefit), Related to Stock-Based Compensation Goodwill Goodwill Forfeiture of restricted awards Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Other comprehensive income (loss), net of tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Document Transition Report Document Transition Report Title of Individual [Axis] Title of Individual [Axis] Liability Liability [Member] Non-operating income Nonoperating Income (Expense) [Abstract] Cash dividends declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Level 2 Level 2 Fair Value, Inputs, Level 2 [Member] Buildings and improvements Building and Building Improvements [Member] Vesting [Axis] Vesting [Axis] Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Current income taxes Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Total Assets, Fair Value Disclosure Average assets under management Assets under Management, Average Balance Other comprehensive income (loss), before taxes Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Outstanding assuming dilution (in shares) Weighted Average Number of Shares Outstanding, Diluted Nonvested dividend equivalents granted to non-employee directors (in shares) Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Nonvested Dividend Equivalents Granted To Non-Employee Directors Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Nonvested Dividend Equivalents Granted To Non-Employee Directors Basic (in dollars per share) Basic earnings on common stock (in dollars per share) Earnings Per Share, Basic Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Entity File Number Entity File Number Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Weighted-average remaining lease term on operating leases Operating Lease, Weighted Average Remaining Lease Term Net income (loss) attributable to T. Rowe Price Group Income (Loss) from Continuing Operations before Income Taxes, Attributable to Parent Income (Loss) from Continuing Operations before Income Taxes, Attributable to Parent Retained earnings Retained Earnings, Unappropriated Net cash provided by (used in) financing activities Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net subscriptions received from redeemable non-controlling interest holders Proceeds from Noncontrolling Interests Stock-based compensation expense Share-based Payment Arrangement, Expense Net unrealized holding gains AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Balance at beginning of year Balance at end of year Unrecognized Tax Benefits Balance Sheet Location [Axis] Balance Sheet Location [Axis] Common stock, $.20 par value—authorized 750,000,000; issued 227,965,000 shares at December 31, 2020 and 235,214,000 at December 31, 2019 Common Stock, Value, Issued Nonrecurring charge relating to U.S. tax reform Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent Document Fiscal Year Focus Document Fiscal Year Focus Document Annual Report Document Annual Report Total net deferred tax benefits Net deferred tax benefits (income taxes) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Entity Current Reporting Status Entity Current Reporting Status Property and equipment, additions Property, Plant and Equipment, Additions 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. Earnings per share Earnings Per Share, Policy [Policy Text Block] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Other Deferred Income Tax Expense (Benefit), Related to Other Deferred Income Tax Expense (Benefit), Related to Other 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 Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Common stock, shares issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value VOE Voting Interest Entities [Member] Voting Interest Entities [Member] Investment partnerships and other investments Other Equity Method Investments [Member] Other equity method investments Other Deferred Tax Liabilities, Other Operating lease liabilities Operating lease liabilities, as reported Operating Lease, Liability Net income attributable to redeemable non-controlling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Accounts receivable and accrued revenue Accounts receivable Accounts Receivable, after Allowance for Credit Loss Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Total permanent stockholders' equity Beginning balances Ending balances Stockholders' Equity Attributable to Parent Concentration Risk Type [Domain] Concentration Risk Type [Domain] Net gains on investments Investment Income, Nonoperating, Other Than Consolidated Sponsored Investment Portfolios Investment Income, Nonoperating, Other Than Consolidated Sponsored Investment Portfolios Net excess tax benefits from stock-based compensation plans activity Effective Income Tax Rate Reconciliation, Share-Based Compensation, Excess Tax Benefits (Tax Shortfalls), Percent Effective Income Tax Rate Reconciliation, Share-Based Compensation, Excess Tax Benefits (Tax Shortfalls), Percent Total liabilities, redeemable non-controlling interests and permanent stockholders’ equity Liabilities and Equity INVESTMENTS Investment [Text Block] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax INCOME TAXES Income Tax Disclosure [Text Block] Entity Address, City or Town Entity Address, City or Town Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Consolidated T. Rowe Price investment products Consolidated Investment Portfolios [Member] Consolidated Investment Portfolios [Member] Restricted stock units Restricted Stock Units (RSUs) [Member] Changes in tax positions related to expired statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Investment advisory fees Investment advisory fees Asset Management [Member] 2025 Lessee, Operating Lease, Liability, to be Paid, Year Five Deferred tax liabilities Deferred Tax Liabilities, Gross [Abstract] Income Tax Reform [Table] Income Tax Reform [Table] Income Tax Reform [Table] Type of Adoption [Domain] Accounting Standards Update [Domain] Less: net income allocated to outstanding restricted stock and stock unit holders (basic) Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Dispositions of T. Rowe Price investment products Proceeds from Sale, Maturity and Collection of Investments Other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax [Abstract] Amount of cash incentive compensation senior officers elected to defer Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount Equity Component [Domain] Equity Component [Domain] Nonrecurring income tax charge due to Maryland state tax legislation Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Dividends paid to common stock and equity-award holders Payments of Dividends LIABILITIES Liabilities [Abstract] Senior officers Executive Officer [Member] Property and equipment, net Total Property, Plant and Equipment, Net Fourth quarter 2021 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter Four Of Next Fiscal Year Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter Four Of Next Fiscal Year Reportable entities Reportable Legal Entities [Member] Entity Tax Identification Number Entity Tax Identification Number Revenue recognition Revenue from Contract with Customer [Policy Text Block] Stock issued, restricted stock award, net of shares withheld for taxes Stock Issued During Period, Value, Restricted Stock Award, Net Of Shares Withheld For Taxes Stock Issued During Period, Value, Restricted Stock Award, Net Of Shares Withheld For Taxes STOCK-BASED COMPENSATION Share-based Payment Arrangement [Text Block] Net income attributable to T. Rowe Price Group Net income Net income attributable to T. Rowe Price Group Net Income (Loss) Attributable to Parent Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Investment, Name [Domain] Investment, Name [Domain] Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Leases [Abstract] Leases [Abstract] Net assets Net Assets Current Fiscal Year End Date Current Fiscal Year End Date Operating expenses Operating Expenses [Abstract] Less: comprehensive income (loss) attributable to redeemable non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Earnings per share on common stock of T. Rowe Price Group Earnings Per Share [Abstract] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Schedule of deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Nonrecurring charge related to Dell appraisal rights matter Unusual or Infrequent Item, or Both, Loss, Gross Net subscriptions into T. Rowe Price investment products Subscription From Redemption Distribution To Noncontrolling Interest A positive value represents subscriptions net of redemptions and distributions to redeemable non-controlling interest holders of a less than wholly owned subsidiary. A negative value represents redemptions and distributions paid to redeemable non-controlling interest holders net of subscriptions received. NAV Per Share Fair Value Measured at Net Asset Value Per Share [Member] State income taxes for current year, net of federal income tax benefits Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent U.S. Treasury note Debt Securities, Held-to-maturity Reclassification adjustments recognized in non-operating income Reclassification from AOCI, Current Period, before Tax, Attributable to Parent STOCKHOLDERS’ EQUITY Stockholders' Equity Attributable to Parent [Abstract] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents [Abstract] Liabilities of consolidated T. Rowe Price investment products ($47.7 million at December 31, 2020 and $27.0 million at December 31, 2019, related to variable interest entities) Liabilities Of Voting Interest Entities And Variable Interest Entities Liabilities Of Voting Interest Entities And Variable Interest Entities Liabilities Of Voting Interest Entities And Variable Interest Entities Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Document Fiscal Period Focus Document Fiscal Period Focus Compensation and related costs attributable to the development of computer software for internal use Software Development [Member] Net income allocated to common stockholders (diluted) Net Income (Loss) Available to Common Stockholders, Diluted Common stock-based compensation plans activity: Shares Granted or Issued, Share-based Payment Arrangement [Abstract] Entity Filer Category Entity Filer Category Common stock Common Stock [Member] Currency translation adjustments Currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Less: net income (loss) attributable to redeemable non-controlling interests Net income attributable to redeemable non-controlling interests Net income (loss) attributable to redeemable non-controlling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Product and Service [Domain] Product and Service [Domain] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Dividends declared Dividends, Cash Expense recognized for defined contribution retirement plans Defined Contribution Plan, Cost Geographic concentration Geographic Concentration Risk [Member] Changes in tax positions related to prior years Unrecognized Tax Benefits, Increase (Decrease) Resulting from Prior Period Tax Positions Unrecognized Tax Benefits, Increase (Decrease) Resulting from Prior Period Tax Positions Summary of property and equipment Property, Plant and Equipment [Table Text Block] Stockholder-approved plans Stockholder Approved Plans For Stock Options The number of stockholder approved plans under which qualified incentive and nonqualified fixed stock options are granted. Other Disclosures [Abstract] Other Disclosures [Abstract] Other Disclosures [Abstract] Subadvised funds, separate accounts, collective investment trusts, and other investment products Subadvised, Separate Accounts, And Other Investment Products [Member] Subadvised, Separate Accounts, And Other Investment Products [Member] Net deferred tax benefits Other Comprehensive Income (Loss), Tax Leasehold improvements Leasehold Improvements [Member] Unusual or Infrequent Item, or Both [Domain] Unusual or Infrequent Item, or Both [Domain] Fixed income, including money market Bond And Money Market [Member] Bond and money market [Member] Money market mutual funds Money Market Funds [Member] Stock compensation plan Share-based Payment Arrangement [Member] Supplemental Savings Plan, maximum deferral period Deferred Compensation Arrangement with Individual, Initial Maximum Contractual Term Deferred Compensation Arrangement with Individual, Initial Maximum Contractual Term Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Shares issued upon option exercises (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Net change in cash and cash equivalents during period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Total non-operating income Gains recognized upon deconsolidation Nonoperating Income (Expense) Schedule of future minimum lease payments Lessee, Operating Lease, Liability, Maturity [Table Text Block] Options Share-based Payment Arrangement, Option [Member] Basis of preparation - basis of accounting Basis of Accounting, Policy [Policy Text Block] Outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted-average exercise price of options forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Distribution and servicing costs Distribution Expenses Distribution Expenses Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Plan Name [Domain] Plan Name [Domain] Administrative, distribution, and servicing fees Administrative, Distribution, And Servicing [Member] Administrative, Distribution, And Servicing [Member] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Equity method investment (ownership percentage) Equity Method Investment, Ownership Percentage Assets of consolidated T. Rowe Price investment products ($2,497.4 million at December 31, 2020 and $1,975.3 million at December 31, 2019, related to variable interest entities) Assets of consolidated T. Rowe Price investment products Assets Of Voting Interest Entities And Variable Interest Entities Assets Of Voting Interest Entities And Variable Interest Entities Supplemental savings plan liability economic hedges Sponsored Investment Portfolios Designated As Economic Hedge Of Supplemental Savings Plan Liability [Member] Sponsored Investment Portfolios Designated As Economic Hedge Of Supplemental Savings Plan Liability [Member] Unconsolidated investments Investment [Table Text Block] Cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Provision for income taxes Total Income Tax Expense (Benefit) Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Net income taxes paid Income Taxes Paid, Net Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Property and equipment Property, Plant and Equipment, Policy [Policy Text Block] Gain on sale of equity investments Equity Method Investment, Realized Gain (Loss) on Disposal Employee stock-based compensation programs Employee Stock Based Compensation Programs [Member] Employee Stock-Based Compensation Programs Title of Individual [Domain] Title of Individual [Domain] Liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Local Phone Number Local Phone Number Schedule of unrecognized tax benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value CASH EQUIVALENTS Cash and Cash Equivalents Disclosure [Text Block] Net gains (losses) reflected in non-operating income Investment Income, Net Consolidation eliminations Consolidation, Eliminations [Member] Supplemental savings plan Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Deferred Compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Deferred Compensation Entity Address, Address Line One Entity Address, Address Line One Supplemental savings plan liability Deferred Income Tax Expense (Benefit), Related to Compensation and Benefits, Deferred Compensation Deferred Income Tax Expense (Benefit), Related to Compensation and Benefits, Deferred Compensation Entity Emerging Growth Company Entity Emerging Growth Company Shares issued upon option exercises Stock Issued During Period, Value, Stock Options Exercised Unusual or Infrequent Item, or Both [Table] Unusual or Infrequent Item, or Both [Table] Property and equipment Deferred Income Tax Expense (Benefit), Related to Property and Equipment Deferred Income Tax Expense (Benefit), Related to Property and Equipment Deferred income taxes (benefits) Total deferred income taxes (benefits) Deferred Income Tax Expense (Benefit) Award Type [Axis] Award Type [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Maximum Maximum [Member] Value at vest date Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Sponsored Investment Portfolios Sponsored Investment Portfolios [Member] Sponsored Investment Portfolios U.S. mutual funds Sponsored Mutual Funds In U S [Member] Sponsored mutual funds in the U.S. DELL APPRAISAL RIGHTS MATTER Unusual or Infrequent Items, or Both, Disclosure [Text Block] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Net cash provided by (used in) investing activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Purchases of T. Rowe Price investment products Payments to Acquire Investments General, administrative, and other Other General and Administrative Expense Weighted-average remaining contractual term in years, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Domain] Award Type [Domain] Accrued compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Accrued Compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Accrued Compensation Investments [Domain] Investments [Domain] Trading Symbol Trading Symbol Weighted-average common shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted-average exercise price of options exercisable at current period-end (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Other comprehensive income before reclassifications and income taxes OCI, before Reclassifications, before Tax, Attributable to Parent PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] EARNINGS PER SHARE CALCULATIONS Earnings Per Share [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Supplemental savings plan liability economic hedges Sponsored Investment Portfolios, Supplemental Savings Plan Liability Economic Hedges [Member] Sponsored Investment Portfolios, Supplemental Savings Plan Liability Economic Hedges Redeemable non-controlling interests Beginning balances attributable to redeemable non-controlling interests Ending balances attributable to redeemable non-controlling interests Attributable to redeemable non-controlling interests Redeemable Noncontrolling Interest, Equity, Carrying Amount Statutory U.S. federal income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Entity Shell Company Entity Shell Company Second quarter 2021 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter Two Of Next Fiscal Year Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter Two Of Next Fiscal Year Fair value, measurements, recurring Fair Value, Recurring [Member] Weighted-average exercise price of options expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price New accounting guidance and newly issued but not yet adopted accounting guidance New Accounting Pronouncements, Policy [Policy Text Block] Entity Public Float Entity Public Float Total 2021 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Next Fiscal Year Unrecognized cost of unvested share-based compensation awards to be recognized in the next fiscal year. Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]