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Income Taxes - Reconciled Tax at Statutory Rates (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Income tax expense computed at the statutory tax rates | $ 135.1 | $ 109.7 | $ 58.1
US state income taxes, net of the federal benefit | 10.6 | 9.2 | 8.0
Asbestos - effect of foreign exchange | (13.3) | (3.5) | 36.8
Expenses not deductible | 3.3 | 1.9 | 2.0
Stock and executive compensation | 1.9 | (0.8) | 5.5
Foreign taxes on domestic income | 61.2 | 55.2 | 49.8
Prior year tax adjustments | (0.1) | (1.2) | (5.9)
Taxes on foreign income | 12.0 | 9.9 | 1.6
US net operating loss carryback | 0.0 | 0.0 | (4.9)
Other items | 0.8 | 3.6 | (1.8)
Total income tax expense | $ 211.5 | $ 184.0 | $ 149.2
Effective tax rate (as percent) | 29.20% | 28.60% | 36.20%

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