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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair value measurements [Line items]    
Investments $ 199.7 $ 377.4
Cost method, private equity and other investments    
Fair value measurements [Line items]    
Investments 50.9 16.8
Other investments    
Fair value measurements [Line items]    
Investments 187.9 196.9
Other investments | Cost method, private equity and other investments    
Fair value measurements [Line items]    
Investments 142.2 128.0
Investments in pooled funds    
Fair value measurements [Line items]    
Investments 7.6 11.5
Fair value measured on a recurring basis    
Fair value measurements [Line items]    
Deferred compensation liabilities (33.6) (7.9)
Derivative Liability (0.1) (0.4)
Fair Value, Net Asset (Liability) 203.8 669.9
Fair value measured on a recurring basis | Money market funds    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 180.0 437.0
Fair value measured on a recurring basis | Equity securities    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 45.4 188.4
Fair value measured on a recurring basis | Seed Capital Investments    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 12.1 61.0
Fair value measured on a recurring basis | Securities sold short    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure   (8.2)
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1)    
Fair value measurements [Line items]    
Deferred compensation liabilities (33.6) (7.9)
Derivative Liability 0.0 0.0
Fair Value, Net Asset (Liability) 203.9 670.3
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1) | Money market funds    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 180.0 437.0
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1) | Equity securities    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 45.4 188.4
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1) | Seed Capital Investments    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 12.1 61.0
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1) | Securities sold short    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure   (8.2)
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2)    
Fair value measurements [Line items]    
Deferred compensation liabilities 0.0 0.0
Derivative Liability (0.1) (0.4)
Fair Value, Net Asset (Liability) (0.1) (0.4)
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Money market funds    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 0.0 0.0
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 0.0 0.0
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Seed Capital Investments    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 0.0 0.0
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Securities sold short    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure   0.0
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3)    
Fair value measurements [Line items]    
Deferred compensation liabilities 0.0 0.0
Derivative Liability 0.0 0.0
Fair Value, Net Asset (Liability) 0.0 0.0
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Money market funds    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 0.0 0.0
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Equity securities    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure 0.0 0.0
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Seed Capital Investments    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure $ 0.0 0.0
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Securities sold short    
Fair value measurements [Line items]    
Investments, Fair Value Disclosure   $ 0.0