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Financial Instruments (Forward Foreign Exchange Contracts) (Details) - Foreign Exchange Contracts
£ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
AUD ($)
Mar. 31, 2019
MXN ($)
Mar. 31, 2019
CAD ($)
Mar. 31, 2019
GBP (£)
British Pound Sterling          
Derivative [Line Items]          
Foreign Currency Amount | £         £ 5.0
US Dollar Amount $ 7.2        
Weighted average exchange rate per $1 USD 0.69 0.69 0.69 0.69 0.69
Canadian Dollar          
Derivative [Line Items]          
Foreign Currency Amount       $ 20.7  
US Dollar Amount $ 16.2        
Weighted average exchange rate per $1 USD 1.28 1.28 1.28 1.28 1.28
Australia, Dollars          
Derivative [Line Items]          
Foreign Currency Amount   $ 3.5      
US Dollar Amount $ 2.7        
Weighted average exchange rate per $1 USD 1.27 1.27 1.27 1.27 1.27
Mexico, Pesos          
Derivative [Line Items]          
Foreign Currency Amount     $ 108.3    
US Dollar Amount $ 5.6        
Weighted average exchange rate per $1 USD 19.30 19.30 19.30 19.30 19.30