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Common and Treasury Stock (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Common stock activity [Roll Forward]      
Beginning balance (in shares) 47.4    
Beginning balance $ 29.6    
Ending balance (in shares) 47.8 47.4  
Ending balance 29.9 29.6  
Treasury stock activity [Roll Forward]      
Beginning balance (in shares) (0.6)    
Beginning balance (14.5)    
Purchase of treasury stock (0.1) (0.5) (0.1)
Ending balance (in shares) (0.6) (0.6)  
Ending balance (14.6) (14.5)  
Common Stock [Member]
      
Common stock activity [Roll Forward]      
Beginning balance (in shares) 47.4 47.1 46.8
Beginning balance 29.6 29.4 29.2
Stock options and awards (in shares) 0.4 0.3 0.3
Stock options and awards 0.3 0.2 0.2
Ending balance (in shares) 47.8 47.4 47.1
Ending balance 29.9 29.6 29.4
Treasury Stock [Member]
      
Treasury stock activity [Roll Forward]      
Beginning balance (in shares) (0.6) (0.6) (0.6)
Beginning balance (14.5) (14.0) (13.9)
Purchase of treasury stock (in shares) 0 0 0
Purchase of treasury stock (0.1) (0.5) (0.1)
Ending balance (in shares) (0.6) (0.6) (0.6)
Ending balance $ (14.6) $ (14.5) $ (14.0)