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Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Deferred Tax Assets [Abstract] |  |
Accounts receivable | $ 0.7 | $ 0.9
Inventories | 6.3 | 6.0
Plant and equipment | 12.0 | 17.2
Lease liabilities | 19.1 | 15.9
Pension and employee benefits | 27.7 | 24.1
Net operating and capital losses | 45.9 | 55.4
Credit carryforwards | 45.3 | 49.0
Research and experimental expenditures | 12.2 | 8.0
Other, principally accrued liabilities | 11.2 | 13.2
Total gross deferred tax assets | 180.4 | 189.7
Less: valuation allowances | (63.0) | (61.6)
Net deferred tax assets | 117.4 | 128.1
Deferred Tax Liabilities [Abstract] |  |
Plant and equipment | 7.2 | 7.5
Lease assets | 18.8 | 15.7
Goodwill | 4.8 | 4.8
Intangible assets | 40.9 | 20.1
Other | 0.6 | 1.1
Total gross deferred tax liabilities | 72.3 | 49.2
Net deferred tax assets | $ 45.1 | $ 78.9

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