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Income Taxes - Reconciled Tax at Statutory Rates (Detail) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Income tax expense computed at the statutory tax rates | $ (48.9) | $ (24.6) | $ (84.4)
US state income taxes, net of the federal benefit | (3.1) | (4.3) | (3.0)
Asbestos - effect of foreign exchange | 14.9 | (1.8) | 0.8
Expenses not deductible | (4.9) | (4.7) | (2.5)
US manufacturing deduction | 0.0 | 2.5 | 2.2
Foreign taxes on domestic income | (34.5) | (34.2) | (2.1)
Amortization of intangibles | 0.0 | 12.4 | 2.8
Taxes on foreign income | 4.5 | (3.0) | (5.4)
Net deferred tax liability revaluation | 0.2 | 27.7 | 0.0
Other items | 0.0 | 1.8 | 1.1
Total income tax expense | $ (71.8) | $ (28.2) | $ (90.5)
Effective tax rate (as percent) | 23.90% | 16.20% | 24.70%

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