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Income Tax Matters - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Loss and credit carryforwards | $ 33.4 | $ 48.7
Salaried VEBA (see Note 5) | 4.8 | 8.7
Other assets | 29.4 | 30.1
Leased assets | 7.3 | 7.1
Inventories | 6.9 | 9.4
Valuation allowances | (6.4) | (9.9)
Total deferred income tax assets | 75.4 | 94.1
Deferred income tax liabilities: |  |
Property, plant and equipment | (80.8) | (78.5)
Leased liability | (6.4) | (6.3)
Undistributed foreign earnings | (2.1) | (2.0)
Total deferred income tax liabilities | (89.3) | (86.8)
Net deferred income tax liabilities | $ (13.9) |
Net deferred income tax assets |  | $ 7.3

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