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Fair Value Measurements (Tables)
6 Months Ended
Oct. 31, 2011
Fair Value Measurements [Abstract]  
Summary of assets and liabilities measured at fair value on a recurring basis
                                 
(Dollars in millions)   Level 1     Level 2     Level 3     Total  

Assets:

                               

Commodity derivatives

  $ 0.4       —         —       $ 0.4  

Currency derivatives

    —         0.1       —         0.1  

Interest rate swaps

    —         3.4       —         3.4  
         

Liabilities:

                               

Currency derivatives

    —         11.9       —         11.9