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Fair Value of Financial Instruments - Financial assets and liabilities accounted for at fair value on a recurring basis by level within the fair value hierarchy (Details) - Foreign Currency Exchange Contracts - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives assets, current $ 0.5  
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives assets, current 0.5 $ 0.1
Derivative liabilities, current   1.8
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives assets, current $ 0.5 0.1
Derivative liabilities, current   $ 1.8