LONG-TERM INCENTIVE COMPENSATION - Restricted Fund Units Liability Compensation Expense (Details) $ in Millions	Sep. 30, 2025 USD ($)
Share-Based Payment Arrangement [Abstract]
Fourth quarter 2025	$ 9.9
2026	24.7
2027 through 2029	23.3
Total	$ 57.9

Employee Service Restricted Fund Units, Nonvested Awards, Compensation Cost To Be Recognized Quarter Four Of Current Fiscal Year, Fair Market Value

No definition available.

Name:	trow_EmployeeServiceRestrictedFundUnitsNonvestedAwardsCompensationCostToBeRecognizedQuarterFourOfCurrentFiscalYearFairMarketValue
Namespace Prefix:	trow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant