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Fair Value Measurements - Contingent Consideration (Details)
$ in Millions
9 Months Ended
Jun. 06, 2013
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration (minimum)     $ 0.3
Contingent consideration (up to)     $ 0.6
Contingent consideration period 10 years    
Other | Measurement Input, Discount Rate | Fair Value, Recurring | Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration, measurement input     0.13
Contingent Consideration      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Reduced fair value of contingent consideration liability   $ 49.2