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Fair Value Measurements - Changes in Level 3 Liabilities (Details) - Level 3 - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Contingent Payment Obligations    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 21.0 $ 40.3
Purchases and issuances 0.0 0.0
Settlements and reductions 0.0 0.0
Net realized and unrealized gains (6.3) (19.3)
Balance, end of period 14.7 21.0
Net change in unrealized (gains) losses relating to instruments still held at the reporting date (6.3) (19.3)
Affiliate Equity Purchase Obligations    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 24.5 12.6
Purchases and issuances 113.7 75.8
Settlements and reductions (75.4) (52.1)
Net realized and unrealized gains (8.9) (11.8)
Balance, end of period 53.9 24.5
Net change in unrealized (gains) losses relating to instruments still held at the reporting date $ (4.0) $ (5.9)