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Fair Value Measurements - Fair Value, Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Equity securities $ 122.0 $ 110.0
Redeemable noncontrolling interests 41.5 35.6
Other Current Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Equity securities 37.2 30.9
Other Noncurrent Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Equity securities 84.8 79.1
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Equity securities 3.7 3.7
Redeemable noncontrolling interests 0.0 0.0
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Equity securities 118.3 106.3
Redeemable noncontrolling interests 0.0 0.0
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Equity securities 0.0 0.0
Redeemable noncontrolling interests $ 41.5 $ 35.6