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Pension and Other Postretirement Benefits
3 Months Ended
Jul. 31, 2011
Pension and Other Postretirement Benefits [Abstract]  
Pension and Other Postretirement Benefits
8. Pension and Other Postretirement Benefits
The following table shows the components of the pension and other postretirement benefit expense recognized for our U.S. benefit plans during the periods covered by this report. Information about similar international plans is not presented due to immateriality.
                                 
    Pension Benefits     Other Benefits  
(Dollars in millions)   2010     2011     2010     2011  
Service cost
  $ 3.9     $ 4.0     $ 0.3     $ 0.4  
Interest cost
    8.3       8.5       0.8       0.8  
Expected return on plan assets
    (9.1 )     (10.1 )            
Amortization of:
                               
Prior service cost
    0.2       0.2             0.1  
Net actuarial loss
    4.7       4.9              
 
                       
Net expense
  $ 8.0     $ 7.5     $ 1.1     $ 1.3