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Income Taxes (Deferred Income Taxes) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred Tax Assets, Employee Benefits Costs $ 36.2 $ 61.8
Deferred Tax Assets, Inventory 18.6 16.2
Deferred Tax Assets, Property, Plant and Equipment 191.5 193.8
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards 206.2 211.1
Deferred Tax Assets, Accrued Expenses 0.4 2.1
Deferred Tax Assets, Long-Term Debt and Financing Costs 10.8 12.6
Deferred Tax Asset, Lease Liability 0.9 1.5
Deferred Tax Assets, Other 0.2 0.2
Deferred Tax Assets, Gross 464.8 499.3
Deferred Tax Assets, Valuation Allowance (414.7) (486.0)
Deferred Tax Assets, Net of Valuation Allowance 50.1 13.3
Deferred Tax Liabilities, Intangible Assets 7.9 9.9
Deferred Tax Liability, Lease Asset 0.4 1.1
Deferred Tax Liabilities, Prepaid Expenses 0.4 0.4
Deferred Tax Liabilities 8.7 11.4
Deferred Tax Assets, Net, Current $ 41.4 $ 1.9