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Financial Instruments - Estimated Fair Value of Financial Instruments (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expenses and Other Current Assets | Derivatives Designated as Hedging Instruments | Interest rate swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net recognized assets in Balance Sheet $ 2.1 $ 0.0
Prepaid Expenses and Other Current Assets | Derivatives Not Designated as Hedging Instruments | Foreign currency forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net recognized assets in Balance Sheet 0.0 0.1
Accrued Liabilities | Derivatives Designated as Hedging Instruments | Interest rate swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net recognized liabilities in Balance Sheet 0.0 0.0
Accrued Liabilities | Derivatives Not Designated as Hedging Instruments | Foreign currency forward contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net recognized liabilities in Balance Sheet $ 0.0 $ 0.0