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Income Taxes - Tax Effects of Temporary Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Deferred tax assets: |  |
Tax loss carryforwards and credits | $ 1,377.4 | $ 1,530.9
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 573.7 | 276.6
Accrued postretirement benefit obligations | 93.8 | 142.6
Asset retirement obligations | 95.5 | 86.6
Employee benefits | 22.8 | 25.3
Take-or-pay obligations | 11.0 | 12.0
Investments and other assets | 88.0 | 89.0
Workers’ compensation obligations | 7.8 | 7.6
Operating lease liabilities | 17.5 | 20.8
Other | 24.1 | 16.7
Total gross deferred tax assets | 2,311.6 | 2,208.1
Valuation allowance, income tax | (2,287.3) | (2,068.4)
Total deferred tax assets | 24.3 | 139.7
Deferred tax liabilities: |  |
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 36.2 | 100.9
Operating lease right-of-use assets | 13.5 | 20.8
Coal supply agreements | 3.1 | 3.1
Investments and other assets | 1.6 | 15.4
Total deferred tax liabilities | 54.4 | 140.2
Deferred Tax Liabilities, Net | (30.1) | (0.5)
Deferred taxes are classified as follows: |  |
Noncurrent deferred income tax asset | 4.9 | 28.3
Noncurrent deferred income tax liability | $ (35.0) | $ (28.8)

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