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Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Other investments $ 2,057.3 $ 1,865.8
Class A    
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 180,988,130 181,348,114
Common stock, outstanding (in shares) 180,988,130 181,348,114
Class B    
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 12,561,294 12,561,444
Common stock, outstanding (in shares) 12,561,294 12,561,444
Class C    
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 374,982,853 386,588,921
Common stock, outstanding (in shares) 374,982,853 386,588,921