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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Foreign currency exchange losses $ 0.1 $ 2.0 $ 0.1 $ 4.7