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Investments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Deferred compensation liabilities $ (24.4) $ (23.3)
Derivative instruments   (0.3)
Total 660.8 577.3
Money Market Funds [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value 648.3 558.0
Marketable Equity Securities [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value 36.8 32.6
Seed Capital Investments [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value 0.1 10.3
Quoted prices in Active Markets for Identical Assets (Level 1) [Member]    
Schedule of Investments [Line Items]    
Deferred compensation liabilities (24.4) (23.3)
Total 660.8 577.6
Quoted prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value 648.3 558.0
Quoted prices in Active Markets for Identical Assets (Level 1) [Member] | Marketable Equity Securities [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value 36.8 32.6
Quoted prices in Active Markets for Identical Assets (Level 1) [Member] | Seed Capital Investments [Member]    
Schedule of Investments [Line Items]    
Investments measured at fair value $ 0.1 10.3
Significant Other Observable Inputs (Level 2) [Member]    
Schedule of Investments [Line Items]    
Derivative instruments   (0.3)
Total   $ (0.3)