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Fair Value Measurements - Changes in Level 3 Liabilities (Details) - Level 3 - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Contingent Payment Obligations    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 14.7 $ 21.0
Purchases and issuances 0.0 0.0
Settlements and reductions 0.0 0.0
Net realized and unrealized gains (9.0) (6.3)
Balance, end of period 5.7 14.7
Net change in unrealized (gains) losses relating to instruments still held at the reporting date (9.0) (6.3)
Affiliate Equity Purchase Obligations    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 53.9 24.5
Purchases and issuances 110.0 113.7
Settlements and reductions (108.7) (75.4)
Net realized and unrealized gains (0.4) (8.9)
Balance, end of period 54.8 53.9
Net change in unrealized (gains) losses relating to instruments still held at the reporting date $ 0.1 $ (4.0)