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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Foreign currency re-measurement exchange gains (losses) $ (3.2) $ 1.7 $ 0.2
Deferred unrealized losses (1.1) (1.2)  
Deferred unrealized losses, tax $ 0.1 $ 0.1