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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Deferred income tax assets    
Pensions $ 281.2 $ 281.0
Postretirement benefits other than pensions 122.9 144.7
Federal and state net operating loss tax carryovers 400.9 228.1
Federal and state tax credits 57.2 52.2
Deferred compensation and other benefit plans 25.7 25.9
Self insurance reserves 9.7 10.8
Other items 106.3 85.2
Gross deferred income tax assets 1,003.9 827.9
Valuation allowance for deferred tax assets (322.2) (105.1)
Total deferred income tax assets 681.7 722.8
Deferred income tax liabilities    
Bases of property, plant and equipment 533.8 664.1
Inventory valuation 77.8 62.2
Bases of amortizable intangible assets 23.3 25.4
Other items 50.4 46.7
Total deferred tax liabilities 685.3 798.4
Net deferred tax liability $ (3.6) $ (75.6)