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Operating Segments (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
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 $ 79.2 $ 89.3 $ 78.1