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Business and Basis of Presentation (Other Balance Sheet and Income Statement Items) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Ownership percentage, subsidiaries 100.00%   100.00%  
Concentration Risk [Line Items]        
Warehousing, shipping and handling, and storage costs $ 10.9 $ 10.4 $ 21.4 $ 19.1
UNITED STATES | Geographic Concentration Risk | Cash        
Concentration Risk [Line Items]        
Percentage of deposits located in the United States     27.80%