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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total $ 5,799.4 $ 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 3,115.0 1,931.1
Other investments 1.3 0.5
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 13.8 13.5
Level 2 | Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0.1 0.6
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 104.0 94.0
Discretionary investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products and other investments 1,642.0 1,647.7
Discretionary investments | Level 1 | Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products and other investments 1,642.0 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 252.0 169.5
Seed capital | Level 1 | Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products and other investments 238.3 156.6
Seed capital | Level 2 | Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products and other investments 13.7 12.9
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 802.8 768.1
Supplemental savings plan liability economic hedges | Level 1 | Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
T. Rowe Price investment products and other investments $ 802.8 $ 768.1