v3.26.1
FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents held in money market funds $ 2,866.2 $ 3,049.0
Other investments 0.8 0.3
Investments in affiliated collateralized loan obligations 0.0 0.0
Total 5,380.8 5,014.9
Level 1 | Discretionary investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 954.0 463.7
Level 1 | Redeemable seed capital investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 273.4 258.6
Level 1 | Investments used to hedge the deferred compensation liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 1,286.4 1,243.3
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents held in money market funds 0.0 0.0
Other investments 0.0 0.0
Investments in affiliated collateralized loan obligations 1.9 3.2
Total 66.3 60.7
Level 2 | Discretionary investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 0.0 0.0
Level 2 | Redeemable seed capital investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 64.4 57.5
Level 2 | Investments used to hedge the deferred compensation liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products $ 0.0 $ 0.0