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Provision for Taxes (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Components of Deferred Tax Assets and Liabilities [Abstract] |  |
NOL and credit carryforwards, federal amount | $ 146.0 |
NOL and credit carryfowards, state amount | 366.0 |
Provisional benefit amount | 243.0 |
Deferred tax assets, effect of Tax Cuts and Jobs Act, tax expense (benefit) | 458.5 |
Reclassified amount from accumulated other comprehensive income to retained earnings |  | $ 384.9
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 15.7 | $ 14.3
Unrecognized tax benefits, income tax penalties and interest expense | $ 1.4 |

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