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Other Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Other Investments [Roll Forward]        
Balance, beginning of period $ 457.0 $ 384.7 $ 421.6 $ 375.2
Purchases and commitments 16.0 11.2 62.0 38.3
Sales and distributions (20.5) (31.8) (49.4) (51.0)
Net realized and unrealized (losses) gains 5.4 (10.4) 23.7 (8.8)
Balance, end of period 457.9 353.7 457.9 353.7
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 (losses) 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 406.6 334.3 371.2 324.8
Purchases and commitments 16.0 11.2 62.0 38.3
Sales and distributions (20.5) (31.8) (49.4) (51.0)
Net realized and unrealized (losses) gains 5.4 (10.4) 23.7 (8.8)
Balance, end of period $ 407.5 $ 303.3 $ 407.5 $ 303.3