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Other Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Other Investments [Roll Forward]        
Balance, beginning of period $ 384.7 $ 312.1 $ 375.2 $ 257.2
Other realized and unrealized gains (losses) (10.4) 37.7 (8.8) 87.9
Purchases and commitments 11.2 17.7 38.3 44.6
Sales and distributions (31.8) (10.4) (51.0) (32.6)
Balance, end of period 353.7 357.1 353.7 357.1
Equity Securities Without Readily Determinable Fair Value [Roll Forward]        
Balance, beginning of period 50.4 13.8 50.4 13.8
Net realized and unrealized gains (losses) 0.0 19.7 0.0 19.7
Purchases and commitments 0.0 0.0 0.0 0.0
Sales and distributions 0.0 0.0 0.0 0.0
Balance, end of period 50.4 33.5 50.4 33.5
Fair Value Measured at NAV        
Other Investments [Roll Forward]        
Balance, beginning of period 334.3 298.3 324.8 243.4
Other realized and unrealized gains (losses) (10.4) 18.0 (8.8) 68.2
Purchases and commitments 11.2 17.7 38.3 44.6
Sales and distributions (31.8) (10.4) (51.0) (32.6)
Balance, end of period $ 303.3 $ 323.6 $ 303.3 $ 323.6