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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred Tax Assets    
Receivable allowances $ 1.2 $ 0.9
Postretirement and other employee benefits 17.8 17.1
Net operating loss and tax credit carryforwards 163.4 129.6
Capital loss carryforward 106.5 103.1
Accruals and other liabilities 2.1 0.4
Investment in subsidiaries 8.9 0.0
Capitalized research & development 29.8 0.0
Other 26.5 12.6
Deferred Tax Assets 356.2 263.7
Less: Valuation allowance (231.9) (232.3)
Net deferred income tax assets 124.3 31.4
Deferred Tax Liabilities    
Net property, plant and equipment (131.4) (60.3)
Intangibles (104.1) (31.3)
Investment in subsidiaries 0.0 (0.6)
Derivatives (16.9) (0.3)
Other (9.7) (0.1)
Net deferred income tax liabilities (262.1) (92.6)
Less: Valuation allowance 0.0 0.0
Total net deferred income tax liabilities $ (137.8) $ (61.2)