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Investments - Schedule of Changes in Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Other Investments [Roll Forward]        
Balance, beginning of period $ 526.3 $ 522.9 $ 539.0 $ 480.9
Purchases and commitments funded 40.8 17.8 48.9 64.6
Sales and distributions (17.0) (17.7) (41.8) (26.7)
Net realized and unrealized gains 16.0 7.3 20.0 11.5
Balance, end of period 566.1 530.3 566.1 530.3
Equity Securities Without Readily Determinable Fair Value [Roll Forward]        
Balance, beginning of period 50.4 50.4 50.4 50.4
Purchases and commitments funded 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 475.9 472.5 488.6 430.5
Purchases and commitments funded 40.8 17.8 48.9 64.6
Sales and distributions (17.0) (17.7) (41.8) (26.7)
Net realized and unrealized gains 16.0 7.3 20.0 11.5
Balance, end of period $ 515.7 $ 479.9 $ 515.7 $ 479.9