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Investments - Details Of Company Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Investment Holdings [Line Items]    
Equity method investments $ 470.2 $ 426.1
Foreign time deposits 29.3 29.9
Other 10.3 10.5
Total investments 857.6 826.8
Seed money    
Investment Holdings [Line Items]    
Equity investments 135.4 153.5
Investments related to deferred compensation plans    
Investment Holdings [Line Items]    
Equity investments 207.8 202.7
Other equity securities    
Investment Holdings [Line Items]    
Equity investments $ 4.6 $ 4.1