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Derivative Instruments and Hedging Activities (Forward Foreign Exchange Contracts) (Details) - Forward exchange contracts
€ in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions
Jun. 30, 2018
USD ($)
Jun. 30, 2018
AUD ($)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
CAD ($)
Jun. 30, 2018
GBP (£)
British Pounds Sterling          
Derivative [Line Items]          
Foreign Currency Amount | £         £ 5.5
US Dollar Amount $ 7.7        
Weighted average exchange rate per $1 USD 0.71 0.71 0.71 0.71 0.71
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       $ 16.4  
US Dollar Amount $ 13.0        
Weighted average exchange rate per $1 USD 1.26 1.26 1.26 1.26 1.26
Australia, Dollars          
Derivative [Line Items]          
Foreign Currency Amount   $ 1.4      
US Dollar Amount $ 1.2        
Weighted average exchange rate per $1 USD 1.16 1.16 1.16 1.16 1.16