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Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Deferred Tax Assets [Abstract]    
Accounts receivable $ 0.5 $ 0.7
Inventories 5.3 6.3
Plant and equipment 10.1 12.0
Lease liabilities 24.2 19.1
Pension and employee benefits 26.7 27.7
Net operating and capital losses 50.3 45.9
Credit carryforwards 35.0 45.3
Research and experimental expenditures 19.1 12.2
Other, principally accrued liabilities 10.2 11.2
Total gross deferred tax assets 181.4 180.4
Less: valuation allowances (67.6) (63.0)
Net deferred tax assets 113.8 117.4
Deferred Tax Liabilities [Abstract]    
Plant and equipment 9.1 7.2
Lease assets 24.1 18.8
Goodwill 4.9 4.8
Intangible assets 31.3 40.9
Other 1.5 0.6
Total gross deferred tax liabilities 70.9 72.3
Net deferred tax assets $ 42.9 $ 45.1