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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
Sep. 30, 2017
USD ($)
Sep. 30, 2017
HUF
Sep. 30, 2017
GBP (£)
Sep. 30, 2017
CAD
Sep. 30, 2017
EUR (€)
British Pounds Sterling          
Derivative [Line Items]          
Foreign Currency Amount | £     £ 0.1    
US Dollar Amount $ 0.1        
Weighted average exchange rate per $1 USD 0.75 0.75 0.75 0.75 0.75
Hungary, Forint          
Derivative [Line Items]          
Foreign Currency Amount | HUF   HUF 2,851.5      
US Dollar Amount $ 10.4        
Weighted average exchange rate per $1 USD 274.39 274.39 274.39 274.39 274.39
Euro Member Countries, Euro          
Derivative [Line Items]          
Foreign Currency Amount | €         € 2.0
US Dollar Amount $ 2.3        
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 17.2  
US Dollar Amount $ 13.6        
Weighted average exchange rate per $1 USD 1.26 1.26 1.26 1.26 1.26