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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Oct. 31, 2011
Fair Value of Financial Instruments [Abstract]  
Comparison of the fair values and carrying amounts of financial instrument
                 
(Dollars in millions)   Carrying
Amount		     Fair
Value		  

Assets:

                

Cash and cash equivalents

   $ 380.1     $ 380.1  

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  

Short-term borrowings

     2.5       2.5  

Current portion of long-term debt

     253.5       258.2  

Long-term debt

     504.2       529.3