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v3.20.4

Income Taxes (Components of Net Deferred Tax Liability) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Deferred tax assets: |  |
Retirement benefit liabilities | $ 6.3 | $ 6.4
Black lung benefit liabilities | 14.8 | 12.8
Share-based compensation | 4.2 | 4.7
Federal tax credit carryforward | 19.9 | 20.5
Foreign tax credit carryforward | 19.4 | 14.4
Federal net operating loss | 5.3 | 1.6
Section 163(j) interest limitation carryforward | 0.0 | 5.7
State tax credit carryforward, net of federal income tax effects | 0.3 | 1.1
State net operating loss carryforward, net of federal income tax effects | 12.9 | 13.6
Other liabilities not yet deductible | 11.5 | 4.4
Total deferred tax assets | 94.6 | 85.2
Less valuation allowance | (19.6) | (20.9)
Deferred tax asset, net | 75.0 | 64.3
Deferred tax liabilities: |  |
Properties, plants and equipment | (152.9) | (17.9)
Investment in partnerships | (81.4) | (194.0)
Total deferred tax liabilities | (234.3) | (211.9)
Net deferred tax liability | (159.3) | $ (147.6)
Provisional income tax expense (benefit) | $ 10.7 |

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