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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred income tax assets |  |
Pensions | $ 281.0 | $ 251.8
Postretirement benefits other than pensions | 144.7 | 169.0
Federal and state net operating loss tax carryovers | 228.1 | 122.7
Federal and state tax credits | 52.2 | 53.6
Deferred compensation and other benefit plans | 25.9 | 25.6
Self insurance reserves | 10.8 | 10.1
Other items | 85.2 | 79.1
Gross deferred income tax assets | 827.9 | 711.9
Valuation allowance for deferred tax assets | (105.1) | (34.4)
Total deferred income tax assets | 722.8 | 677.5
Deferred income tax liabilities |  |
Bases of property, plant and equipment | 664.1 | 579.5
Inventory valuation | 62.2 | 111.7
Bases of amortizable intangible assets | 25.4 | 75.5
Other items | 46.7 | 53.9
Total deferred tax liabilities | 798.4 | 820.6
Net deferred tax liability | $ (75.6) | $ (143.1)

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