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Fair Value Measurements (Tables)
9 Months Ended
Jan. 31, 2012
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:

                               

Currency derivatives

    —       $ 2.0       —       $ 2.0  

Interest rate swaps

    —         3.5       —         3.5  
         

Liabilities:

                               

Commodity derivatives

    0.4       —         —         0.4  

Currency derivatives

    —         4.3       —         4.3