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Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred income tax assets    
Net operating loss tax carryovers $ 298.7 $ 309.4
Pensions 94.3 153.8
Postretirement benefits other than pensions 69.8 86.5
Tax credits 40.2 37.7
Other items 103.9 82.9
Gross deferred income tax assets 606.9 670.3
Valuation allowance for deferred tax assets (431.0) (461.8)
Total deferred income tax assets 175.9 208.5
Deferred income tax liabilities    
Bases of property, plant and equipment 114.0 119.2
Inventory valuation 32.5 53.3
Bases of amortizable intangible assets 18.0 12.5
Other items 24.7 35.9
Total deferred tax liabilities 189.2 220.9
Net deferred tax (liability) $ (13.3) $ (12.4)