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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration liability $ 0.0 $ 13.4
Discretionary investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 261.0 246.4
Seed capital    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 297.6 247.8
Supplemental savings plan liability economic hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 901.9 806.6
Level 1 | Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents held in money market funds 2,735.3 1,678.1
Other investments 0.1 0.7
Investments in affiliated collateralized loan obligations 0.0 0.0
Total 4,138.4 2,937.8
Contingent consideration liability 0.0 0.0
Level 1 | Fair value, measurements, recurring | Discretionary investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 261.0 246.4
Level 1 | Fair value, measurements, recurring | Seed capital    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 240.1 206.0
Level 1 | Fair value, measurements, recurring | Supplemental savings plan liability economic hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 901.9 806.6
Level 2 | Fair value, measurements, recurring    
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 7.6 8.4
Total 65.1 50.2
Contingent consideration liability 0.0 0.0
Level 2 | Fair value, measurements, recurring | 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 | Fair value, measurements, recurring | Seed capital    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 57.5 41.8
Level 2 | Fair value, measurements, recurring | Supplemental savings plan liability economic hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 0.0 0.0
Level 3 | Fair value, measurements, recurring    
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 42.2 0.0
Investments in affiliated collateralized loan obligations 0.0 0.0
Total 42.2 0.0
Contingent consideration liability $ 0.0 13.4
Measurement input 8.90%  
Level 3 | Fair value, measurements, recurring | 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 3 | Fair value, measurements, recurring | Seed capital    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products 0.0 0.0
Level 3 | Fair value, measurements, recurring | Supplemental savings plan liability economic hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products $ 0.0 $ 0.0