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Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred income tax assets |  |
Pensions | $ 115.7 | $ 247.1
Postretirement benefits other than pensions | 182.9 | 210.4
State net operating loss tax carryovers | 32.2 | 35.9
Federal and state tax credits | 42.0 | 39.9
Deferred compensation and other benefit plans | 29.4 | 28.1
Self insurance reserves | 10.1 | 10.4
Other items | 79.5 | 64.3
Gross deferred income tax assets | 491.8 | 636.1
Valuation allowance for deferred tax assets | (33.9) | (24.8)
Total deferred income tax assets | 457.9 | 611.3
Deferred income tax liabilities |  |
Bases of property, plant and equipment | 488.1 | 400.2
Inventory valuation | 66.5 | 77.1
Bases of amortizable intangible assets | 67.1 | 70.5
Other items | 46.3 | 16.0
Total deferred tax liabilities | 668.0 | 563.8
Net deferred tax asset (liability) | $ (210.1) | $ 47.5

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