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Other Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Other Investments [Roll Forward]    
Balance, beginning of period $ 375.2 $ 257.2
Net realized and unrealized gains 15.3 29.8
Purchases and commitments 15.1 18.1
Sales and distributions (11.5) (12.4)
Balance, end of period 394.1 292.7
Without Readily Determinable Fair Values    
Balance, beginning of period 50.4 13.8
Net realized and unrealized gains 0.0 0.0
Purchases and commitments 0.0 0.0
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 324.8 243.4
Net realized and unrealized gains 15.3 29.8
Purchases and commitments 15.1 18.1
Sales and distributions (11.5) (12.4)
Balance, end of period $ 343.7 $ 278.9