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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

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Face amount or stated value per share of common stock.

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