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Financial Instruments - Gains (Losses) on Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Selling, General and Administrative Expenses | Foreign currency forward contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Loss on cash flow hedge $ 0.0 $ (0.6)