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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value Measured on a Recurring Basis - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Financial Assets    
Investments in equity securities $ 95.8 $ 447.9
Investments in debt securities 348.4 269.0
Derivative financial instruments 1.9 0.5
Financial Liabilities    
Contingent payment obligations 23.4 21.0
Affiliate equity purchase obligations 68.4 24.5
Derivative financial instruments 1.5 0.9
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets    
Investments in equity securities 95.8 305.6
Investments in debt securities 0.0 0.0
Derivative financial instruments 0.0 0.0
Financial Liabilities    
Contingent payment obligations 0.0 0.0
Affiliate equity purchase obligations 0.0 0.0
Derivative financial instruments 0.0 0.0
Significant Other Observable Inputs (Level 2)    
Financial Assets    
Investments in equity securities 0.0 142.3
Investments in debt securities 348.4 269.0
Derivative financial instruments 1.9 0.5
Financial Liabilities    
Contingent payment obligations 0.0 0.0
Affiliate equity purchase obligations 0.0 0.0
Derivative financial instruments 1.5 0.9
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Investments in equity securities 0.0 0.0
Investments in debt securities 0.0 0.0
Derivative financial instruments 0.0 0.0
Financial Liabilities    
Contingent payment obligations 23.4 21.0
Affiliate equity purchase obligations 68.4 24.5
Derivative financial instruments $ 0.0 $ 0.0