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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Discretionary investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products and other investments $ 1,610.2 $ 1,647.7
Seed capital    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products and other investments 236.6 169.5
Supplemental savings plan liability economic hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products and other investments 795.5 768.1
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 5,589.3 4,504.0
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 2,966.7 1,931.1
Other investments 0.7 0.5
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 and other investments 1,610.2 1,647.7
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 and other investments 216.2 156.6
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 and other investments 795.5 768.1
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 20.5 13.5
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 0.1 0.6
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 and other investments 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 and other investments 20.4 12.9
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 and other investments 0.0 0.0
Fair value measured at NAV    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products and other investments $ 107.8 $ 94.0