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Income Taxes (Components of Net Deferred Tax Liability) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Retirement benefit liabilities | $ 4.2 | $ 5.5
Black lung benefit liabilities | 13.2 | 14.4
Share-based compensation | 2.0 | 2.6
Federal tax credit carryforward | 8.7 | 17.6
Foreign tax credit carryforward | 9.2 | 12.3
State net operating loss carryforward, net of federal income tax effects | 12.9 | 12.6
Other liabilities not yet deductible | 12.9 | 10.4
Total deferred tax assets | 63.1 | 75.4
Less valuation allowance | (9.2) | (20.2)
Deferred tax asset, net | 53.9 | 55.2
Deferred tax liabilities: |  |
Properties, plants and equipment | (155.4) | (151.0)
Investment in partnerships | (70.8) | (73.2)
Total deferred tax liabilities | (226.2) | (224.2)
Net deferred tax liability | $ (172.3) | $ (169.0)

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