Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes - Reconciled Tax at Statutory Rates (Details)

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Income Taxes - Reconciled Tax at Statutory Rates (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Income Tax Disclosure [Abstract]      
Income tax expense computed at the statutory tax rates $ 135.1 $ 135.1 $ 109.7
US state income taxes, net of the federal benefit 14.0 10.6 9.2
Asbestos - effect of foreign exchange (3.2) (13.3) (3.5)
Expenses not deductible 3.6 3.3 1.9
Stock and executive compensation 7.6 1.9 (0.8)
Foreign taxes on domestic income 60.2 61.2 55.2
Taxes on foreign income 17.7 12.0 9.9
Net deferred tax remeasurement 7.3 2.3 3.5
Other items 2.3 (1.6) (1.1)
Total income tax expense $ 244.6 $ 211.5 $ 184.0
Effective tax rate (as percent) 32.40% 29.20% 28.60%