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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)

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