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Other Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Other Investments [Roll Forward]        
Balance, beginning of period $ 394.1 $ 292.7 $ 375.2 $ 257.2
Other realized and unrealized gains (losses) (13.7) 20.4 1.7 50.2
Purchases and commitments 12.1 8.8 27.1 26.9
Sales and distributions (7.8) (9.8) (19.3) (22.2)
Balance, end of period 384.7 312.1 384.7 312.1
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 0.0 0.0 0.0 0.0
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 13.8 50.4 13.8
Fair Value Measured at NAV        
Other Investments [Roll Forward]        
Balance, beginning of period 343.7 278.9 324.8 243.4
Other realized and unrealized gains (losses) (13.7) 20.4 1.7 50.2
Purchases and commitments 12.1 8.8 27.1 26.9
Sales and distributions (7.8) (9.8) (19.3) (22.2)
Balance, end of period $ 334.3 $ 298.3 $ 334.3 $ 298.3