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Income Tax Matters, Components of Deferred Tax Assets and Liabilities Table (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred income tax assets: |  |
Loss and credit carryforwards | $ 255.7 | $ 275.4
VEBAs (see Note 6) | 25.9 | 5.1
Other assets | 38.7 | 37.8
Inventories | 0.0 | 18.7
Valuation allowances | (21.2) | (19.2)
Total deferred income tax assets | 299.1 | 317.8
Deferred income tax liabilities: |  |
Property, plant and equipment | (79.6) | (74.1)
VEBAs (see Note 6) | 0.0 | (120.6)
Inventories | (9.4) | (6.7)
Total deferred income tax liabilities | (89.0) | (201.4)
Net deferred income tax assets | 210.1 | 116.4
Deferred Tax Assets, Net of Valuation Allowance, Current | 49.6 | 86.4
Net deferred income tax assets, long term | 162.6 | 30.9
Deferred tax liability, long term | $ (2.1) | (0.9)
Net deferred income tax assets, current |  | $ 86.4

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