CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Investments and receivables at fair value	$ 2,179.0	$ 2,757.8
Class A
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	171,917,370	174,310,558
Common stock, outstanding (in shares)	171,917,370	174,310,558
Class B
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	12,994,000	12,930,839
Common stock, outstanding (in shares)	12,994,000	12,930,839
Class C
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	274,436,585	340,114,729
Common stock, outstanding (in shares)	274,436,585	340,114,729