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Significant Accounting Policies, Short-term Investments, Property, Plant and Equipment and Assets Held for Sale (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Short-Term Investments [Abstract] |  |  |
Short-term investments | $ 3.7 | $ 3.2 |
Property, Plant and Equipment [Abstract] |  |  |
Accrued capital expenditures | 7.9 | 8.7 | $ 17.9
Assets Held For Sale [Abstract] |  |  |
Impairment charges | 166.8 | $ 8.6 | $ 0.4
Held for Sale [Member] |  |  |
Assets Held For Sale [Abstract] |  |  |
Impairment charges | 166.8 |  |
Liabilities Held for Sale [Member] |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Accrued capital expenditures | $ 2.7 |  |

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