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Income Taxes Tax Effects of Temporary Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Tax loss carryforwards and credits | $ 1,530.9 | $ 1,729.3
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 276.6 | 304.5
Accrued postretirement benefit obligations | 142.6 | 139.5
Asset retirement obligations | 86.6 | 47.2
Employee benefits | 25.3 | 24.8
Take or pay obligations | 12.0 | 17.1
Investments and other assets | 89.0 | 82.7
Workers’ compensation obligations | 7.6 | 6.2
Operating lease right-of-use assets | 20.8 | 0.0
Other | 16.7 | 38.2
Total gross deferred tax assets | 2,208.1 | 2,389.5
Valuation allowance, income tax | (2,068.4) | (2,094.3)
Total deferred tax assets | 139.7 | 295.2
Deferred tax liabilities: |  |
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 100.9 | 203.4
Operating lease liabilities | 20.8 | 0.0
Coal supply agreements | 3.1 | 9.3
Investments and other assets | 15.4 | 43.7
Deferred Tax Liabilities, Net | (0.5) |
Total deferred tax liabilities | 140.2 | 256.4
Net deferred tax (liability) asset |  | 38.8
Deferred taxes are classified as follows: |  |
Noncurrent deferred income tax asset | 28.3 | 48.5
Noncurrent deferred income tax liability | $ (28.8) | (9.7)
Net deferred tax (liability) asset |  | $ 38.8

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