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Hedging Transactions and Derivative Instruments - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]      
Document Fiscal Year Focus 2018    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax $ 0.4 $ (0.5) $ 0.7
Unrealized net gains (losses) arising during period (2.0) 3.4 $ (2.5)
Foreign Exchange Forward [Member] | Cash Flow Hedging | Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative, notional amount $ 41.6 $ 17.9