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Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Leases [Abstract]      
Rent expense on operating leases $ 20.6 $ 21.8 $ 20.8
Operating leases minimum payment in 2013 15.9    
Operating leases minimum payment in 2014 7.5    
Operating leases minimum payment in 2015 5.9    
Operating leases minimum payment in 2016 4.8    
Operating leases minimum payment in 2017 3.4    
Operating leases minimum payment after 2017 $ 6.1