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Operating Segments (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting [Abstract]      
Ownership percentage in affiliate 49.00%    
Number of regional operating segments 5    
Number of regions into a single reporting segment 4    
Investment in unconsolidated affiliate $ 78.1 $ 81.8 $ 74.9