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Income Taxes (Deferred Income Taxes) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred Tax Assets, Employee Benefits Costs $ 61.8 $ 65.3
Deferred Tax Assets, Inventory 16.2 17.8
Deferred Tax Assets, Property, Plant and Equipment 197.8 182.3
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards 211.1 190.9
Deferred Tax Assets, Accrued Expenses 2.1 4.2
Deferred Tax Assets, Long-Term Debt and Financing Costs 12.6 13.2
Deferred Tax Asset, Lease Liability 1.5 2.0
Deferred Tax Assets, Other 0.2 0.2
Deferred Tax Assets, Gross 503.3 475.9
Deferred Tax Assets, Valuation Allowance (486.0) (459.5)
Deferred Tax Assets, Net of Valuation Allowance 17.3 16.4
Deferred Tax Liabilities, Intangible Assets 13.9 14.7
Deferred Tax Liability, Lease Asset 1.1 1.5
Deferred Tax Liabilities, Prepaid Expenses 0.4 0.2
Deferred Tax Liabilities 15.4 16.4
Deferred Tax Assets, Net, Current $ 1.9 $ 0.0