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Severance And Other Restructuring Charges (Tables)
12 Months Ended
Mar. 31, 2013
Restructuring And Related Activities [Abstract]  
Activity for Severance and Related Costs Resulting from Process Improvement Initiatives

Activity for severance and related costs during fiscal 2013 resulting from this initiative is summarized as follows:

 

     Balance at
April 1, 2012
     Charged to
Expense
    Cash
Payments
     Balance at
March 31, 2013
 
     (In millions)  

Severance and related costs

   $ —         $ (19.9   $ 0.1       $ (19.8