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Financial Instruments - Gains (Losses) on Derivative Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Foreign currency forward contracts | Selling, General and Administrative Expenses      
Derivative Instruments, Gain (Loss) [Line Items]      
Loss on derivative instruments $ (4.0) $ 5.0 $ (5.9)