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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax assets |  |
Pensions | $ 155.5 | $ 159.4
Postretirement benefits other than pensions | 83.8 | 87.3
Net operating loss tax carryovers | 264.4 | 307.5
Tax credits | 42.6 | 49.7
Other items | 86.1 | 69.7
Gross deferred income tax assets | 632.4 | 673.6
Valuation allowance for deferred tax assets | (94.5) | (194.8)
Total deferred income tax assets | 537.9 | 478.8
Deferred income tax liabilities |  |
Bases of property, plant and equipment | 364.2 | 371.5
Inventory valuation | 65.5 | 67.1
Bases of amortizable intangible assets | 23.7 | 29.9
Other items | 27.0 | 14.5
Total deferred tax liabilities | 480.4 | 483.0
Net deferred tax asset | $ 57.5 |
Net deferred tax (liability) |  | $ (4.2)

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