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Operating Segments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
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 | $ 76.4 | $ 79.2 | $ 89.3
Accounts Receivable, Allowance for Credit Loss, Current | $ 2.0 | $ 3.0 | $ 2.0
Due Period Of Accounts Receivables | 30 days |  |

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