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Business and Basis of Presentation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Ownership percentage, subsidiaries 100.00%   100.00%  
Warehousing, shipping and handling, and storage costs $ 15.1 $ 10.9 $ 28.6 $ 21.4