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Income Taxes - Components of deferred tax liabilities and assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax liabilities:    
Depreciation, depletion, and amortization $ 248.7 $ 230.8
Total deferred tax liabilities 248.7 230.8
Deferred tax assets:    
Workers compensation and other benefits 12.3 13.9
Warranties and reserves 1.1 1.1
Equity items 0.0 (0.3)
Tax carryforwards and credits 36.9 52.8
Inventory 6.1 1.9
Accrued liabilities and other 1.5 (2.3)
Total deferred tax assets 57.9 67.1
Net deferred tax assets (liabilities) before valuation allowances (190.8) (163.7)
Valuation allowances 7.0 9.1
Adjusted net deferred tax assets (liabilities) $ (197.8) $ (172.8)