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Income Taxes Deferred tax (Details 3) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax liabilities: |  |
Depreciation and amortization | $ 317.3 | $ 864.2
Depletion | 390.8 | 260.9
Partnership tax basis differences | 64.6 | 67.6
Undistributed earnings of non-U.S. subsidiaries | 15.0 | 15.0
Other liabilities | 10.3 | 150.6
Total deferred tax liabilities | 798.0 | 1,358.3
Before valuation allowance |  |
Alternative minimum tax credit carryforwards | 76.5 | 46.8
Capital loss carryforwards | 3.0 | 0.1
Foreign tax credit carryforwards | 493.5 | 322.9
Net operating loss carryforwards | 408.9 | 112.0
Pension plans and other benefits | 33.4 | 2.1
Asset retirement obligations | 187.6 | 174.1
Deferred revenue | 0.0 | 252.0
Other assets | 388.8 | 169.7
Subtotal | 1,591.7 | 1,079.7
Valuation allowance | 1,530.5 | 584.1
Net deferred tax assets | 61.2 | 495.6
Net deferred tax liabilities | (736.8) | (862.7)
Deferred tax assets of both foreign and U.S. jurisdictions | $ 361.6 | $ 440.3

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