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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets    
Receivable allowances $ 0.9 $ 0.5
Postretirement and other employee benefits 17.1 21.0
Derivatives 0.0 2.5
Net operating loss and tax credit carryforwards 129.6 104.4
Capital loss carryforward 103.1 12.1
Accruals and other liabilities 0.4 0.7
Intangibles 0.0 37.6
Other 12.6 4.4
Deferred Tax Assets 263.7 183.2
Less: Valuation allowance (232.3) (166.6)
Net deferred income tax assets 31.4 16.6
Deferred Tax Liabilities    
Net property, plant and equipment (60.3) (55.7)
Intangibles (31.3) 0.0
Investment in subsidiaries (0.6) (3.2)
Derivatives (0.3) 0.0
Other (0.1) (0.3)
Net deferred income tax liabilities (92.6) (59.2)
Total net deferred income tax liabilities $ (61.2) $ (42.6)