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Income Taxes (Deferred Income Taxes) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred Tax Assets, Employee Benefits Costs $ 27.1 $ 33.5
Deferred Tax Assets, Inventory 31.3 21.3
Deferred Tax Assets, Property, Plant and Equipment 178.0 190.2
Deferred Tax Assets, in Process Research and Development 3.3 3.5
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards 172.0 188.6
Deferred Tax Assets, Accrued Expenses 0.4 4.9
Deferred Tax Assets, Long-Term Debt and Financing Costs 5.5 7.6
Deferred Tax Asset, Lease Liability 0.8 2.1
Deferred Tax Assets, Other 0.6 0.4
Deferred Tax Assets, Gross 419.0 452.1
Deferred Tax Assets, Valuation Allowance (382.4) (414.1)
Deferred Tax Assets, Net of Valuation Allowance 36.6 38.0
Deferred Tax Liabilities, Intangible Assets 7.1 9.0
Deferred Tax Liability, Lease Asset 0.6 1.8
Deferred Tax Liabilities, Prepaid Expenses 0.4 0.4
Deferred Tax Liabilities 8.1 11.2
Deferred Tax Assets, Net, Current $ 28.5 $ 26.8