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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets    
Pensions $ 159.4 $ 158.0
Postretirement benefits other than pensions 87.3 86.5
Net operating loss tax carryovers 307.5 336.1
Tax credits 49.7 92.6
Deferred compensation and other benefit plans 2.4 13.8
Other items 67.3 55.9
Gross deferred income tax assets 673.6 742.9
Valuation allowance for deferred tax assets (194.8) (274.0)
Total deferred income tax assets 478.8 468.9
Deferred income tax liabilities    
Bases of property, plant and equipment 371.5 375.3
Inventory valuation 67.1 50.0
Bases of amortizable intangible assets 29.9 38.7
Other items 14.5 7.0
Total deferred tax liabilities 483.0 471.0
Net deferred tax liability $ (4.2) $ (2.1)