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Income Taxes - Reconciled Tax at Statutory Rates (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Income tax expense computed at the statutory tax rates | $ (58.1) | $ (38.7) | $ (48.9)
US state income taxes, net of the federal benefit | (8.0) | (5.7) | (3.1)
Asbestos - effect of foreign exchange | (36.8) | 20.9 | 14.9
Expenses not deductible | (2.0) | (5.5) | (4.0)
Stock and executive compensation | (5.5) | (1.7) | (1.3)
Foreign taxes on domestic income | (49.8) | (43.5) | (34.5)
Prior year tax adjustments | 5.9 | (0.4) | (0.3)
Taxes on foreign income | (1.6) | 2.7 | 4.5
US net operating loss carryback | 4.9 | 25.5 | 0.0
Other items | 1.8 | (0.1) | 0.9
Total income tax expense | $ (149.2) | $ (46.5) | $ (71.8)
Effective tax rate (as percent) | 36.20% | 16.10% | 23.90%

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