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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, 2020
USD ($)
Mar. 31, 2020
AUD ($)
Mar. 31, 2020
EUR (€)
Mar. 31, 2020
CAD ($)
Mar. 31, 2020
GBP (£)
British Pound Sterling          
Derivative [Line Items]          
Notional amount $ 18.5       £ 14.4
Weighted average exchange rate per $1 USD 0.78 0.78 0.78 0.78 0.78
Euro          
Derivative [Line Items]          
Notional amount | $ $ 2.4        
Weighted average exchange rate per $1 USD 0.90 0.90 0.90 0.90 0.90
Foreign Exchange Forward Contract, Foreign Currency Amount | €     € 2.1    
Canadian Dollar          
Derivative [Line Items]          
Notional amount $ 5.5     $ 7.3  
Weighted average exchange rate per $1 USD 1.32 1.32 1.32 1.32 1.32
Australia, Dollars          
Derivative [Line Items]          
Notional amount $ 1.7 $ 2.2      
Weighted average exchange rate per $1 USD 1.25 1.25 1.25 1.25 1.25