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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax assets    
Net operating loss tax carryovers $ 309.4 $ 264.4
Pensions 153.8 155.5
Postretirement benefits other than pensions 86.5 83.8
Tax credits 37.7 42.6
Other items 82.9 86.1
Gross deferred income tax assets 670.3 632.4
Valuation allowance for deferred tax assets (461.8) (94.5)
Total deferred income tax assets 208.5 537.9
Deferred income tax liabilities    
Bases of property, plant and equipment 119.2 364.2
Inventory valuation 53.3 65.5
Bases of amortizable intangible assets 12.5 23.7
Other items 35.9 27.0
Total deferred tax liabilities 220.9 480.4
Net deferred tax asset   $ 57.5
Net deferred tax (liability) $ (12.4)