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FAIR VALUE MEASUREMENTS. (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Discretionary investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value $ 1,647.7 $ 1,221.8
Seed capital    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value 169.5 181.1
Level 1 | Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,931.1 1,355.6
Other Investments 0.5 0.0
Total 4,504.0 3,309.7
Level 1 | Fair value, measurements, recurring | Discretionary investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value 1,647.7 1,221.8
Level 1 | Fair value, measurements, recurring | Seed capital    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value 156.6 171.2
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]    
Investments held at fair value 768.1 561.1
Level 2 | Fair value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0.0 0.0
Other Investments 0.6 0.0
Total 13.5 9.9
Level 2 | Fair value, measurements, recurring | Seed capital    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value 12.9 9.9
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]    
Investments held at fair value 0.0 $ 0.0
NAV Per Share    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value $ 94.0