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Risks, Uncertainties, Contingencies and Litigation (Details) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 USD ($) Customer | Mar. 31, 2020 USD ($) Customer | Mar. 31, 2019 Customer
Environmental loss contingencies [Abstract] |  |  |
Reserves for environmental matters | $ | $ 16.0 | $ 18.2 |
Sales [Member] | Customer Concentration Risk [Member] | Top Ten Customers [Member] |  |  |
Credit Risk [Abstract] |  |  |
Concentration risk, percentage | 43.00% | 45.00% | 50.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] |  |  |
Credit Risk [Abstract] |  |  |
Number of top customers | 10 |  |
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Top Ten Customers [Member] |  |  |
Credit Risk [Abstract] |  |  |
Concentration risk, percentage | 35.00% | 34.00% |
Vehicular [Member] |  |  |
Credit Risk [Abstract] |  |  |
Number of major customers | 1 | 1 | 2

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