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Significant Accounting Policies Recent Accounting Pronouncements (Details) (ASU 2013-11, USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
ASU 2013-11
   
Item Effected [Line Items]    
Increase in noncurrent deferred income tax liability and reduction in unrecognized tax benefits (within other liabilities) $ 7.0 $ 6.3