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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Assets    
Receivable allowances $ 1.3 $ 1.2
Postretirement and other employee benefits 10.9 12.3
Net operating loss and tax credit carryforwards 305.5 163.2
Capital loss carryforward 47.4 106.5
Accruals and other liabilities 0.8 0.3
Investment in subsidiaries 0.1 8.9
Capitalized research & development 36.8 29.8
Section 163(j) Interest Limitation 9.9 12.4
Right Of Use Liabilities 14.7 10.0
Other 15.0 6.9
Deferred Tax Assets 442.4 351.5
Less: Valuation allowance (323.0) (225.5)
Net deferred income tax assets 119.4 126.0
Deferred Tax Liabilities    
Net property, plant and equipment (89.2) (109.1)
Intangibles (136.7) (104.1)
Derivatives (9.0) (16.9)
Right Of Use Assets (15.1) (9.7)
Other (5.3) (3.9)
Net deferred income tax liabilities (255.3) (243.7)
Total net deferred income tax liabilities $ (135.9) $ (117.7)