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Investments - Details Of Company Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Investment Holdings [Line Items]    
Equity method investments $ 355.1 $ 350.8
Foreign time deposits 27.3 32.0
Other 11.9 14.2
Total investments 709.1 829.5
Seed money    
Investment Holdings [Line Items]    
Equity investments 142.4 235.5
Investments related to deferred compensation plans    
Investment Holdings [Line Items]    
Equity investments 167.7 192.4
Other equity securities    
Investment Holdings [Line Items]    
Equity investments $ 4.7 $ 4.6