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Derivatives and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Gain (loss) on derivative instrument $ 2.0 $ 5.0
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount of derivative asset 89.1  
Foreign Exchange Contract [Member] | Cash Flow Hedge [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount of derivative asset $ 41.3 $ 13.2