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Other Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Other Investments [Roll Forward]    
Balance, beginning of period $ 480.9 $ 421.6
Purchases and commitments 46.8 9.8
Sales and distributions (9.0) (11.5)
Net realized and unrealized gains 4.2 6.1
Balance, end of period 522.9 426.0
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 430.5 371.2
Purchases and commitments 46.8 9.8
Sales and distributions (9.0) (11.5)
Net realized and unrealized gains 4.2 6.1
Balance, end of period $ 472.5 $ 375.6