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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred income tax assets |  |
Net operating loss tax carryovers | $ 184.1 | $ 298.7
Pensions | 51.7 | 94.3
Postretirement benefits other than pensions | 51.5 | 69.8
Tax credits | 42.0 | 40.2
Other items | 95.6 | 103.9
Gross deferred income tax assets | 424.9 | 606.9
Valuation allowance for deferred tax assets | (266.9) | (431.0)
Total deferred income tax assets | 158.0 | 175.9
Deferred income tax liabilities |  |
Bases of property, plant and equipment | 122.2 | 114.0
Inventory valuation | 17.1 | 32.5
Bases of amortizable intangible assets | 9.0 | 18.0
Other items | 23.0 | 24.7
Total deferred tax liabilities | 171.3 | 189.2
Net deferred tax (liability) | $ (13.3) | $ (13.3)

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