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Business and Basis of Presentation (Cost of Sales) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Warehousing, shipping and handling, and storage costs $ 39.2 $ 37.7 $ 32.0