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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Investments measured at fair value $ 1,289.2 $ 1,174.8
Class A    
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 181,560,735 204,450,499
Common stock, outstanding (in shares) 181,560,735 204,450,499
Class B    
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 12,151,526 11,099,593
Common stock, outstanding (in shares) 12,151,526 11,099,593
Class C    
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 438,867,447 531,174,389
Common stock, outstanding (in shares) 438,867,447 531,174,389