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Investments - Details Of Company Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Investment Holdings [Line Items]    
Equity method investments $ 481.9 $ 426.1
Foreign time deposits 28.3 29.9
Other 10.1 10.5
Total investments 965.2 826.8
Seed money    
Investment Holdings [Line Items]    
Equity investments 219.7 153.5
Investments related to deferred compensation plans    
Investment Holdings [Line Items]    
Equity investments 221.0 202.7
Other equity securities    
Investment Holdings [Line Items]    
Equity investments $ 4.2 $ 4.1