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Other Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Other Investments [Roll Forward]    
Balance, beginning of period $ 421.6 $ 375.2
Purchases and commitments 9.8 15.1
Sales and distributions (11.5) (11.5)
Net realized and unrealized gains 6.1 15.3
Balance, end of period 426.0 394.1
Without Readily Determinable Fair Values    
Balance, beginning of period 50.4 50.4
Purchases and commitments 0.0 0.0
Sales and distributions 0.0 0.0
Net realized and unrealized gains 0.0 0.0
Balance, end of period 50.4 50.4
Fair Value Measured at NAV    
Other Investments [Roll Forward]    
Balance, beginning of period 371.2 324.8
Purchases and commitments 9.8 15.1
Sales and distributions (11.5) (11.5)
Net realized and unrealized gains 6.1 15.3
Balance, end of period $ 375.6 $ 343.7