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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred income tax assets |  |
Pensions | $ 159.4 | $ 158.0
Postretirement benefits other than pensions | 87.3 | 86.5
Net operating loss tax carryovers | 307.5 | 336.1
Tax credits | 49.7 | 92.6
Deferred compensation and other benefit plans | 2.4 | 13.8
Other items | 67.3 | 55.9
Gross deferred income tax assets | 673.6 | 742.9
Valuation allowance for deferred tax assets | (194.8) | (274.0)
Total deferred income tax assets | 478.8 | 468.9
Deferred income tax liabilities |  |
Bases of property, plant and equipment | 371.5 | 375.3
Inventory valuation | 67.1 | 50.0
Bases of amortizable intangible assets | 29.9 | 38.7
Other items | 14.5 | 7.0
Total deferred tax liabilities | 483.0 | 471.0
Net deferred tax liability | $ (4.2) | $ (2.1)

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