Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|---|
| Deferred Tax Assets [Abstract] | |||
| Accounts receivable | $ 1.0 | $ 0.5 | |
| Inventories | 11.7 | 5.3 | |
| Plant and equipment | 8.6 | 10.1 | |
| Lease liabilities | 34.6 | 24.2 | |
| Pension and employee benefits | 18.5 | 26.7 | |
| Net operating and capital losses | 49.2 | 50.3 | |
| Credit carryforwards | 37.9 | 35.0 | |
| Goodwill | 4.6 | ||
| Research and experimental expenditures | 1.7 | 19.1 | |
| Deferred revenue liabilities | 42.7 | 2.6 | |
| Other, principally accrued liabilities | 10.3 | 7.6 | |
| Total gross deferred tax assets | 220.8 | 181.4 | |
| Less: valuation allowances | (68.1) | (67.6) | $ (63.0) |
| Net deferred tax assets | 152.7 | 113.8 | |
| Deferred Tax Liabilities [Abstract] | |||
| Plant and equipment | 16.2 | 9.1 | |
| Lease assets | 33.5 | 24.1 | |
| Goodwill | 4.5 | 4.9 | |
| Intangible assets | 38.1 | 31.3 | |
| Other | 0.7 | 1.5 | |
| Total gross deferred tax liabilities | 93.0 | 70.9 | |
| Net deferred tax assets | $ 59.7 | $ 42.9 |
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accounts receivable. No definition available.
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating, capital losses. No definition available.
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from research and experimental expenditures. No definition available.
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred rent. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from leasing arrangements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of deferred tax liability attributable to taxable temporary differences classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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