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Derivatives Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Commodity Derivatives [Member] | Other current liabilities [Member]
   
Derivative, Fair Value, Net [Abstract]    
Derivative Liability, Fair Value, Net $ 0.9 $ 1.2
Commodity Derivatives [Member] | Other noncurrent liabilities [Member]
   
Derivative, Fair Value, Net [Abstract]    
Derivative Liability, Fair Value, Net 0.1 0.1
Foreign Exchange Contract [Member] | Other current assets [Member]
   
Derivative, Fair Value, Net [Abstract]    
Derivative Asset, Fair Value, Net, 0.2 0
Foreign Exchange Contract [Member] | Other current liabilities [Member]
   
Derivative, Fair Value, Net [Abstract]    
Derivative Liability, Fair Value, Net $ 0 $ 0.1