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Other Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Other Investments [Roll Forward]    
Balance, beginning of period $ 421.6 $ 375.2
Net realized and unrealized gains 34.2 1.7
Additions and commitments 82.5 104.3
Sales and distributions (57.4) (59.6)
Balance, end of period 480.9 421.6
Without Readily Determinable Fair Values    
Balance, beginning of period 50.4 50.4
Net realized and unrealized gains 0.0 0.0
Additions and commitments 0.0 0.0
Sales and distributions 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 371.2 324.8
Net realized and unrealized gains 34.2 1.7
Additions and commitments 82.5 104.3
Sales and distributions (57.4) (59.6)
Balance, end of period $ 430.5 $ 371.2