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Income Tax Matters, Components of Deferred Tax Assets and Liabilities Table (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred income tax assets: |  |
Loss and credit carryforwards | $ 191.8 | $ 255.7
VEBAs (see Note 6) | 23.2 | 25.9
Other assets | 39.8 | 38.7
Valuation allowances | (15.7) | (21.2)
Total deferred income tax assets | 239.1 | 299.1
Deferred income tax liabilities: |  |
Property, plant and equipment | (82.7) | (79.6)
Inventories | 0.0 | (9.4)
Total deferred income tax liabilities | (82.7) | (89.0)
Net deferred income tax assets | 156.4 | 210.1
Deferred Tax Assets, Net of Valuation Allowance, Current | 0.0 | 49.6
Net deferred income tax assets, long term | 159.7 | 162.6
Deferred tax liability, long term | $ (3.3) | (2.1)
Net deferred income tax assets, current |  | $ 49.6

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