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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