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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets |  |
Pensions | $ 158.0 | $ 294.9
Postretirement benefits other than pensions | 86.5 | 129.5
Net operating loss tax carryovers | 336.1 | 407.8
Tax credits | 92.6 | 56.7
Deferred compensation and other benefit plans | 13.8 | 25.7
Other items | 55.9 | 107.4
Gross deferred income tax assets | 742.9 | 1,022.0
Valuation allowance for deferred tax assets | (274.0) | (291.4)
Total deferred income tax assets | 468.9 | 730.6
Deferred income tax liabilities |  |
Bases of property, plant and equipment | 375.3 | 547.1
Inventory valuation | 50.0 | 77.6
Bases of amortizable intangible assets | 38.7 | 65.6
Other items | 7.0 | 43.9
Total deferred tax liabilities | 471.0 | 734.2
Net deferred tax liability | $ (2.1) | $ (3.6)

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