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Income Taxes - Components of deferred tax liabilities and assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
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)