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Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Investments $ 1,187.1 $ 1,174.8
Class A    
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 204,748,939 204,450,499
Common stock, outstanding (in shares) 204,748,939 204,450,499
Class B    
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 11,489,888 11,099,593
Common stock, outstanding (in shares) 11,489,888 11,099,593
Class C    
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 522,757,246 531,174,389
Common stock, outstanding (in shares) 522,757,246 531,174,389