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Income Taxes - Components of deferred tax liabilities and assets (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Deferred tax liabilities: |  |
Depreciation, depletion, and amortization | $ 269.0 | $ 248.7
Total deferred tax liabilities | 269.0 | 248.7
Deferred tax assets: |  |
Workers compensation and other benefits | 11.2 | 12.3
Tax carryforwards and credits | 33.3 | 36.9
Inventory | 3.4 | 6.1
Accrued liabilities and other | 4.7 | 2.6
Total deferred tax assets | 52.6 | 57.9
Net deferred tax assets (liabilities) before valuation allowances | (216.4) | (190.8)
Valuation allowances | 7.2 | 7.0
Net deferred tax assets (liabilities) | $ (223.6) | $ (197.8)

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