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Fair Value of Financial Instruments Additional Information (Details) - Forward contracts - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]          
Derivative, notional amount $ 493.1   $ 493.1   $ 357.4
Other accounts receivable          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value foreign currency forward contracts, asset 0.2   0.2    
Accrued expenses          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value foreign currency forward contracts, liabilities         $ 5.0
Other expenses, net          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Recognized (losses) gains of foreign currency forward contracts $ (17.6) $ 3.7 (12.8) $ 8.2  
Other, net          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Change in the fair value of foreign currency forward contracts     12.8 (8.2)  
Cash settlements     $ (18.0)    
Cash receipts       $ 7.7