Supplemental savings plan liability Deferred Compensation Arrangement with Individual, Recorded Liability 2023 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. Balance Sheet Location [Axis] Balance Sheet Location [Axis] OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Net investment income (loss) reflected in non-operating income (loss) Investment Income, Net Customer [Domain] Customer [Domain] Measurement Frequency [Domain] Measurement Frequency [Domain] Period end assets under management Assets under Management, Carrying Amount Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Investment advisory fees Asset Management [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income attributable to T. Rowe Price Net income Net income attributable to T. Rowe Price Net Income (Loss) Attributable to Parent Consolidated Entities [Axis] Consolidated Entities [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Operating lease assets Operating Lease, Right-of-Use Asset Average assets under management Assets under Management, Average Balance Other clients Other Clients [Member] Other Clients [Member] Net consolidations deconsolidation of T. Rowe Price investment products Noncontrolling Interest, Increase (Decrease) From Consolidation And Deconsolidation Noncontrolling Interest, Increase (Decrease) From Consolidation And Deconsolidation City Area Code City Area Code Entity Address, Address Line One Entity Address, Address Line One Attributable to T. Rowe Price Investment, Sponsored Investment Portfolios, Attributable to Parent Represents the reporting entity's interest in consolidated sponsored investment portfolios. This amount is eliminated in consolidation. Stockholders' equity Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] Restricted stock units Restricted Stock Units (RSUs) [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Retained earnings Retained Earnings, Unappropriated [Member] Investments held at fair value T. Rowe Price investment products and other investments Equity securities Equity Securities, FV-NI, Current Performance-based Share-based Payment Arrangement, Tranche Two [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 Equity method investments Equity Method Investments Income Statement [Abstract] Income Statement [Abstract] Amendment Flag Amendment Flag Assets under management Assets Under Management [Member] Assets Under Management [Member] Concentration Risk [Table] Concentration Risk [Table] Additional capital in excess of par value Additional Paid in Capital, Common Stock Entity Filer Category Entity Filer Category Net cash of T. Rowe Price investment products on 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. Other comprehensive income (loss), before taxes Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 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. Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Axis] Product and recordkeeping related costs Product-Related And Client Servicing Expenses Product-Related And Client Servicing Expenses Net change in cash and cash equivalents during 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 Net shares issued upon vesting of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Provision for income taxes Income Tax Expense (Benefit) Stock-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Consolidated Sponsored Investment Portfolios [Abstract] Consolidated Sponsored Investment Portfolios [Abstract] Consolidated Sponsored Investment Portfolios [Abstract] Statement, Equity Components [Axis] Equity Components [Axis] Equity Components [Axis] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Investment Type [Axis] Investment Type [Axis] Other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax [Abstract] Subscriptions payment, net of dividends received Subscriptions Payment, Net Of Dividends Received Subscriptions Payment, Net Of Dividends Received Net subscriptions received from redeemable non-controlling interest holders Proceeds from (Payments to) Noncontrolling Interests Document Fiscal Year Focus Document Fiscal Year Focus Concentration Risk Type [Domain] Concentration Risk Type [Domain] Weighted-average common shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Subsequent Event Type [Domain] Subsequent Event Type [Domain] Net assets Net Assets Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Entity File Number Entity File Number Common shares repurchased Stock Repurchased During Period, Value Accrued compensation and related costs Employee-related Liabilities 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] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Stock options with anti-diluted impact (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Consolidated T. Rowe Price investment products - variable interest entities Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax 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. Product and Service [Axis] Product and Service [Axis] Equity interest issued Business Acquisition, Equity Interest Issued or Issuable, Percent Business Acquisition, Equity Interest Issued or Issuable, Percent Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Small Business Entity Small Business Subsequent Events [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share 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 Stock And Blended Asset [Member] Stock and blended asset [Member] Business Acquisition [Axis] Business Acquisition [Axis] 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 Net gains (losses) on consolidated investment products Investment Income, Nonoperating, Consolidated Sponsored Investment Portfolios Investment Income, Nonoperating, Consolidated Sponsored Investment Portfolios Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Equity Component [Domain] Equity Component [Domain] Special cash dividends declared per share (in dollars per share) Common Stock, Special Dividends, Per Share, Declared Common Stock, Special Dividends, Per Share, Declared Common shares repurchased (in shares) Stock Repurchased During Period, Shares 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 Award Type [Domain] Award Type [Domain] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] ASSETS Assets [Abstract] Accounts payable and accrued expenses Accounts Payable and Other Accrued Liabilities Exercisable at current period-end (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Statement [Line Items] Statement [Line Items] Condensed Income Statement [Table] Condensed Income Statement [Table] Distribution and servicing fees Distribution Service [Member] Grants (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted shares issued, 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 Weighted- average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Cash flows of consolidated sponsored 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. Assets Assets [Member] Concentration risk Concentration Risk, Percentage Preferred stock, undesignated, $.20 par value – authorized and unissued 20,000,000 shares Preferred Stock, Value, Issued Investments Total Investments Purchases of T. Rowe Price investment products Payments to Acquire Investments Dividends declared Dividends, Cash LIABILITIES Liabilities [Abstract] Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Entity Address, City or Town Entity Address, City or Town Fixed income securities Debt Securities, Available-for-sale Variable interest entity, not primary beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Dispositions of T. Rowe Price investment products Proceeds from Sale, Maturity and Collection of Investments Advertising and promotion Marketing and Advertising Expense Entity Address, State or Province Entity Address, State or Province Net gains recognized on investments Net Gains (Losses) Recognized on Investments Net Gains (Losses) Recognized on Investments COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Level 2 Fair Value, Inputs, Level 2 [Member] Less: net income allocated to outstanding restricted stock and stock unit holders (basic) Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Customer [Axis] Customer [Axis] Earnings per share reconciliation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] 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 Entity Shell Company Entity Shell Company Information about Receivables, Revenues, and Services [Abstract] Information about Receivables, Revenues, and Services [Abstract] Information about Receivables, Revenues, and Services Local Phone Number Local Phone Number Other comprehensive income (loss), net of tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Vesting [Axis] Vesting [Axis] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Interactive Data Current Entity Interactive Data Current Net deferred tax (expense) benefits Other Comprehensive Income (Loss), Tax Total assets Assets Net income (loss) attributable to T. Rowe Price Income (Loss) from Continuing Operations before Income Taxes, Attributable to Parent Income (Loss) from Continuing Operations before Income Taxes, Attributable to Parent Investment, Name [Domain] Investment, Name [Domain] Other comprehensive income (loss) before income taxes Other Comprehensive Income (Loss), before Tax Common stock, shares authorized (in shares) Common Stock, Shares Authorized Basic (in dollars per share) Earnings Per Share, Basic Net income allocated to common stockholders (diluted) Net Income (Loss) Available to Common Stockholders, Diluted Geographical [Domain] Geographical [Domain] Net income allocated to common stockholders (basic) Net Income (Loss) Available to Common Stockholders, Basic Product and Service [Domain] Product and Service [Domain] 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 Document Type Document Type Consideration payable at closing Business Combination, Consideration Payable at Closing Business Combination, Consideration Payable at Closing 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 Retained earnings Retained Earnings, Unappropriated Contingent consideration Business Combination, Contingent Consideration, Liability Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Geographic concentration Geographic Concentration Risk [Member] 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] Future stock-based compensation expense Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Entity Current Reporting Status Entity Current Reporting Status Consideration transferred in cash Business Combination, Consideration Transferred In Cash Business Combination, Consideration Transferred In Cash Accounts receivable Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Accounts Receivable Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Accounts Receivable Measurement Frequency [Axis] Measurement Frequency [Axis] Net cash provided by operating activities Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities OAK HILL ADVISORS, L.P OAK HILL ADVISORS, L.P [Member] OAK HILL ADVISORS, L.P [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Operating results of consolidated sponsored investment portfolios Consolidated Sponsored Investment Portfolios Condensed Income Statement [Table Text Block] Tabular disclosure of condensed income statement for consolidated sponsored investment portfolios. Net shares issued upon vesting of restricted stock units Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Entity Tax Identification Number Entity Tax Identification Number 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. Subsequent Event [Line Items] Subsequent Event [Line Items] Net assets of consolidated sponsored investment portfolios Consolidated Sponsored Investment Portfolios Condensed Balance Sheet [Table Text Block] Tabular disclosure of condensed balance sheet for consolidated sponsored investment portfolios. Geographical [Axis] Geographical [Axis] Outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Vesting [Domain] Vesting [Domain] Purchase price Business Combination, Consideration Transferred Less: net income (loss) attributable to redeemable non-controlling interests Net income (loss) attributable to redeemable non-controlling interests Net income (loss) attributable to redeemable non-controlling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Voting interest entities Voting Interest Entities [Member] Voting Interest Entities [Member] Special cash dividends declared Special Dividends, Cash Special Dividends, Cash Investment partnerships and other investments Other Equity Method Investments [Member] Other equity method investments Outside U.S. Non-US [Member] SUBSEQUENT EVENTS Subsequent Events [Text Block] Total comprehensive income attributable to T. Rowe Price Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total Assets, Fair Value Disclosure Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Level 1 Fair Value, Inputs, Level 1 [Member] Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Net cash used in financing activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Document Transition Report Document Transition Report Redeemable noncontrolling 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. Net gains on investments Investment Income, Nonoperating, Other Than Consolidated Sponsored Investment Portfolios Investment Income, Nonoperating, Other Than Consolidated Sponsored Investment Portfolios Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Total liabilities, redeemable non-controlling interests, and permanent stockholders’ equity Liabilities and Equity Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Accounts receivable and accrued revenue Accounts receivable Accounts Receivable, after Allowance for Credit Loss Rollforward of nonvested restricted shares and restricted stock units Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Consolidated T. Rowe Price investment products Consolidated Investment Portfolios [Member] Consolidated Investment Portfolios [Member] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Variable interest entities Variable Interest Entity, Primary Beneficiary [Member] 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 Concentration Risk Type [Axis] Concentration Risk Type [Axis] Fair value measurements summary Fair Value, Assets Measured on Recurring Basis [Table Text Block] Maximum risk of loss related to investments in variable interest entities Schedule of Variable Interest Entities [Table Text Block] Concentration Risk [Line Items] Concentration Risk [Line Items] AOCI AOCI Attributable to Parent [Member] Discretionary investments Discretionary investments Sponsored Investment Portfolios, Discretionary Investments [Member] Sponsored Investment Portfolios, Discretionary Investments [Member] Other assets Other assets Other Assets Dividends payable Dividends Payable Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest Deconsolidation Value 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. EARNINGS PER SHARE CALCULATIONS Earnings Per Share [Text Block] Depreciation and amortization of property and equipment Depreciation, Nonproduction Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Operating expenses Operating Expenses [Abstract] Equity method investment (ownership percentage) Equity Method Investment, Ownership Percentage Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES Information About Receivables Revenues And Services [Text Block] Information About Receivables Revenues And Services [Text Block] Shares issued upon option exercises Stock Issued During Period, Value, Stock Options Exercised Subadvised funds, separate accounts, collective investment trusts, and other investment products Subadvised Funds, Separate Accounts, Collective Investment Trusts, And Other Investment Products [Member] Subadvised Funds, Separate Accounts, Collective Investment Trusts, And Other Investment Products [Member] Other changes in assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Reclassification gains recognized in non-operating income upon deconsolidation of certain T. Rowe Price investment products Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax Other comprehensive income (loss) before reclassifications and income taxes OCI, before Reclassifications, before Tax, Attributable to Parent Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Consolidated Entities [Domain] Consolidated Entities [Domain] Liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Less: comprehensive income (loss) attributable to redeemable non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest INVESTMENTS Investment [Text Block] General, administrative, and other Other General and Administrative Expense Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Multi-asset Multi-Asset [Member] Multi-Asset [Member] Net redemptions from subscription 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. Trading Symbol Trading Symbol Property and equipment, net Property, Plant and Equipment, Net Total operating expenses Operating expenses reflected in net operating income Operating Expenses Percentage of interests acquired Business Acquisition, Percentage of Voting Interests Acquired Restricted stock units issued as dividend equivalents Dividend, Share-based Payment Arrangement, Paid-in-Kind Investment advisory clients Investment Advisory Clients [Member] Investment Advisory Clients [Member] Liabilities of consolidated T. Rowe Price investment products ($62.3 million at September 30, 2021 and $47.7 million at December 31, 2020, related to variable interest entities) Liabilities of consolidated T. Rowe Price investment products Liabilities Of Voting Interest Entities And Variable Interest Entities Liabilities Of Voting Interest Entities And Variable Interest Entities Currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Earnings per share on common stock of T. Rowe Price Earnings Per Share [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 Equity method investments Equity Method Investee [Member] STOCK-BASED COMPENSATION Share-based Payment Arrangement [Text Block] Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income Equity Securities, FV-NI, Unrealized Gain (Loss) Document Quarterly Report Document Quarterly Report Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] 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. Fourth quarter 2021 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter Four Of Fiscal Year Unrecognized cost of unvested share-based compensation awards to be recognized in quarter four of the fiscal year. Technology, occupancy, and facility costs Technology, Depreciation, Occupancy, And Facility Expenses Technology, Depreciation, Occupancy, And Facility Expenses Operating lease liabilities Operating Lease, Liability Administrative fees Administrative Service [Member] 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 Unsettled common stock repurchases liability Unsettled Common Stock Repurchases Liabilities Unsettled Common Stock Repurchases Liabilities 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 Common stock, $.20 par value—authorized 750,000,000; issued 226,217,000 shares at September 30, 2021 and 227,965,000 at December 31, 2020 Common Stock, Value, Issued Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Total non-operating income Gains recognized upon deconsolidation Nonoperating Income (Expense) 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 BASIS OF PRESENTATION Basis of Accounting, Policy [Policy Text Block] Reportable entities Reportable Legal Entities [Member] Commitments and contingent liabilities Commitments and Contingencies Subsequent Event [Table] Subsequent Event [Table] Compensation expense Share-based Payment Arrangement, Expense Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Dividends per share (in dollars per share) Dividends Payable, Amount Per Share Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Weighted-average fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Other investments Other Investments CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS Consolidated Sponsored Investment Portfolios [Text Block] Consolidated Sponsored Investment Portfolios [Text Block] Restricted shares Restricted Stock [Member] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Compensation and related costs Labor and Related Expense Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Investments [Domain] Investments [Domain] Fixed income, including money market Bond And Money Market [Member] Bond and money market [Member] Document Period End Date Document Period End Date Seed capital Seed capital Sponsored Investment Portfolios, Seed Capital [Member] Sponsored Investment Portfolios, Seed Capital [Member] Cash and cash equivalents at beginning of period Cash and cash equivalents at ending of period Cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 23% investment in UTI Asset Management Company Limited (India) UTI Asset Management Company India [Member] UTI Asset Management Company India [Member] Consolidation eliminations Consolidation, Eliminations [Member] Revenues Revenues, Net of Interest Expense [Abstract] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Entity Registrant Name Entity Registrant Name Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Entity Central Index Key Entity Central Index Key Security Exchange Name Security Exchange Name Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Reclassification adjustments recognized in non-operating income Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Cash equivalents held in money market funds Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Shares issued upon option exercises (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Distribution and servicing Distribution Expenses Distribution Expenses Outstanding assuming dilution (in shares) Weighted Average Number of Shares Outstanding, Diluted Cash dividends declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Fair value, measurements, recurring Fair Value, Recurring [Member] Net revenues Revenue from Contract with Customer, Excluding Assessed Tax Administrative, distribution, and servicing fees Administrative, Distribution, And Servicing [Member] Administrative, Distribution, And Servicing [Member] Current Fiscal Year End Date Current Fiscal Year End Date Rollforward of stock options Share-based Payment Arrangement, Option, Activity [Table Text Block] Dividends paid to common stockholders of T. Rowe Price Payments of Dividends STOCKHOLDERS’ EQUITY Stockholders' Equity Note Disclosure [Text Block] Assets of consolidated T. Rowe Price investment products ($1,837.1 million at September 30, 2021 and $2,497.4 million at December 31, 2020, 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 Consolidation Items [Domain] Consolidation Items [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Non-operating income (loss) Nonoperating Income (Expense) [Abstract] Maximum risk of loss related to nonconsolidated variable interest entities Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Common stock Common Stock [Member] Net cash provided by (used in) investing activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Income taxes payable Accrued Income Taxes Net operating income Operating Income (Loss) Net (investments) redemptions in T. Rowe Price investment products used to economically hedge supplemental savings plan liability Proceeds from (Payments for) Trading Securities, Short-term U.S. Treasury note Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] 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 THE COMPANY AND BASIS OF PREPARATION Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests Other comprehensive loss, net of tax, attributable to redeemable non-controlling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense 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 AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Additional capital in excess of par value Additional Paid-in Capital [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Fair values of investments held by consolidated sponsored 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). 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] Net deferred tax benefits (income taxes) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Money Market Funds Money Market Funds [Member] Reclassification out of accumulated other comprehensive income Reclassification out of Accumulated Other Comprehensive Income [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Investment partnerships and other investments Investment Partnership And Other Investments [Member] Investment Partnership And Other Investments [Member] Title of 12(b) Security Title of 12(b) Security Other income (loss) Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Liability Liability [Member] Unconsolidated investments Investment [Table Text Block] T. Rowe Price investment products Sponsored Investment Portfolios [Member] Sponsored Investment Portfolios [Member] U.S. mutual funds Sponsored Mutual Funds In U S [Member] Sponsored mutual funds in the U.S. NEWLY ISSUED BUT NOT YET ADOPTED ACCOUNTING GUIDANCE New Accounting Pronouncements, Policy [Policy Text Block] Other investing activity Payments for (Proceeds from) Other Investing Activities Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Revenue and Services [Line Items] 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. Total Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Total liabilities Liabilities Liabilities Subsequent Event Subsequent Event [Member] Cover [Abstract] Cover [Abstract] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Award Type [Axis] Award Type [Axis] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Goodwill Goodwill Consolidation Items [Axis] Consolidation Items [Axis] Total permanent stockholders’ equity Balances at beginning of period Balances at end of period Stockholders' Equity Attributable to Parent Common stock, shares issued (in shares) Common Stock, Shares, Issued Increase of stock options outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease) Fair value measured at NAV Fair Value Measured at Net Asset Value Per Share [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] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Supplemental savings plan liability economic hedges 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 [Member] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] 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 Repurchases of common stock Payments for Repurchase of Common Stock STOCKHOLDERS’ EQUITY Stockholders' Equity Attributable to Parent [Abstract] Changes in accumulated other comprehensive loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] 2022 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. Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items]