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Financial Instruments and Derivative Financial Instruments - Foreign Currency Forward Contracts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Gain (loss) on foreign currency hedge $ 0.7 $ (0.8) $ 0.5