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Derivative Instruments and Hedging Activities (Outstanding Forward Foreign Exchange Contracts) (Details) - Foreign Exchange Forward
€ in Millions, £ in Millions, HUF in Millions, CAD in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
HUF
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
CAD
Dec. 31, 2017
EUR (€)
British Pounds Sterling          
Derivative [Line Items]          
Foreign Currency Amount | £     £ 3.3    
US Dollar Amount $ 4.3        
Weighted average exchange rate per $1 USD 0.78 0.78 0.78 0.78 0.78
Hungary, Forint          
Derivative [Line Items]          
Foreign Currency Amount | HUF   HUF 1,113.8      
US Dollar Amount $ 4.1        
Weighted average exchange rate per $1 USD 272.18 272.18 272.18 272.18 272.18
Euro Member Countries, Euro          
Derivative [Line Items]          
Foreign Currency Amount | €         € 1.5
US Dollar Amount $ 1.7        
Weighted average exchange rate per $1 USD 0.87 0.87 0.87 0.87 0.87
Canada, Dollars          
Derivative [Line Items]          
Foreign Currency Amount | CAD       CAD 15.0  
US Dollar Amount $ 11.9        
Weighted average exchange rate per $1 USD 1.26 1.26 1.26 1.26 1.26