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Other Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Other Investments [Roll Forward]        
Balance, beginning of period $ 522.9 $ 426.0 $ 480.9 $ 421.6
Purchases and commitments 17.8 36.2 64.6 46.0
Sales and distributions (17.7) (17.4) (26.7) (28.9)
Net realized and unrealized gains 7.3 12.2 11.5 18.3
Balance, end of period 530.3 457.0 530.3 457.0
Equity Securities Without Readily Determinable Fair Value [Roll Forward]        
Balance, beginning of period 50.4 50.4 50.4 50.4
Purchases and commitments 0.0 0.0 0.0 0.0
Sales and distributions 0.0 0.0 0.0 0.0
Net realized and unrealized gains 0.0 0.0 0.0 0.0
Balance, end of period 50.4 50.4 50.4 50.4
Fair Value Measured at NAV        
Other Investments [Roll Forward]        
Balance, beginning of period 472.5 375.6 430.5 371.2
Purchases and commitments 17.8 36.2 64.6 46.0
Sales and distributions (17.7) (17.4) (26.7) (28.9)
Net realized and unrealized gains 7.3 12.2 11.5 18.3
Balance, end of period $ 479.9 $ 406.6 $ 479.9 $ 406.6