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Investments - Details Of Company Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Investment Holdings [Line Items]    
Equity method investments $ 373.0 $ 350.8
Foreign time deposits 25.8 32.0
Other 11.6 14.2
Total investments 744.5 829.5
Seed money    
Investment Holdings [Line Items]    
Equity investments 175.7 235.5
Investments related to deferred compensation plans    
Investment Holdings [Line Items]    
Equity investments 155.8 192.4
Other equity securities    
Investment Holdings [Line Items]    
Equity investments $ 2.6 $ 4.6