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Fair Value Measurements - Fair Value of Contingent Consideration Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Contingent consideration $ (86.3) $ (63.7) $ (12.3)
Fair value, measurements, recurring      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value, beginning of year 346.1 409.8  
Contingent consideration (86.3) (63.7)  
Payments and other 0.0 0.0  
Fair value, end of year $ 259.8 $ 346.1 $ 409.8