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Income Taxes - Tax Effects of Temporary Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Tax loss carryforwards and credits | $ 740.1 | $ 1,267.6
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 550.8 | 571.9
Accrued postretirement benefit obligations | 41.4 | 48.9
Asset retirement obligations | 95.1 | 91.4
Employee benefits | 22.1 | 19.9
Take-or-pay obligations | 8.2 | 9.5
Hedge activities | 49.1 | 36.8
Interest limitation | 0.0 | 7.9
Investments and other assets | 37.0 | 81.8
Workers’ compensation obligations | 7.1 | 7.2
Operating lease liabilities | 7.8 | 11.3
Other | 28.3 | 22.7
Total gross deferred tax assets | 1,587.0 | 2,176.9
Valuation allowance, income tax | (1,451.0) | (2,120.8)
Total deferred tax assets | 136.0 | 56.1
Deferred tax liabilities: |  |
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 67.5 | 66.4
Operating lease right-of-use assets | 7.6 | 9.4
Investments and other assets | 6.6 | 7.6
Total deferred tax liabilities | 81.7 | 83.4
Deferred Tax Assets, Net | 54.3 |
Net deferred tax asset (liability) |  | (27.3)
Deferred taxes are classified as follows: |  |
Noncurrent deferred income tax asset | 74.7 | 0.0
Noncurrent deferred income tax liability | $ (20.4) | $ (27.3)

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