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Other Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Other Investments [Roll Forward]    
Balance, beginning of period $ 257.2 $ 211.8
Net realized and unrealized gains 116.1 23.3
Purchases and commitments 60.3 44.8
Sales and distributions (58.4) (22.7)
Balance, end of period 375.2 257.2
Without Readily Determinable Fair Values    
Balance, beginning of period 13.8 0.0
Net realized and unrealized gains 36.6 5.3
Purchases and commitments 0.0 8.5
Sales and distributions 0.0 0.0
Balance, end of period 50.4 13.8
Fair Value Measured at NAV    
Other Investments [Roll Forward]    
Balance, beginning of period 243.4 211.8
Net realized and unrealized gains 79.5 18.0
Purchases and commitments 60.3 36.3
Sales and distributions (58.4) (22.7)
Balance, end of period $ 324.8 $ 243.4