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Income Taxes - Tax Effects of Temporary Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Deferred tax assets: |  |
Tax loss carryforwards and credits | $ 808.2 | $ 732.5
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 539.0 | 523.2
Accrued postretirement benefit obligations | 29.3 | 33.7
Asset retirement obligations | 108.8 | 102.4
Employee benefits | 19.3 | 19.7
Take-or-pay obligations | 5.9 | 5.5
Investments and other assets | 28.6 | 32.6
Workers’ compensation obligations | 9.3 | 8.4
Operating lease liabilities | 29.5 | 29.0
Other | 38.6 | 33.0
Total gross deferred tax assets | 1,616.5 | 1,520.0
Deferred Tax Assets, Valuation Allowance | (1,469.2) | (1,420.9)
Total net deferred tax assets | 147.3 | 99.1
Deferred tax liabilities: |  |
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 123.7 | 95.5
Operating lease right-of-use assets | 28.9 | 29.1
Investments and other assets | 18.8 | 15.4
Total deferred tax liabilities | 171.4 | 140.0
Deferred taxes are classified as follows on the Consolidated Balance Sheets: |  |
Noncurrent deferred income tax asset | 2.2 | 0.0
Noncurrent deferred income tax liability | 26.3 | 40.9
Net Deferred Tax Liabilities | $ 24.1 | $ 40.9

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