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Income Taxes Income Taxes (Deferred Income Taxes) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred Tax Assets, Employee Benefits Costs $ 79.9 $ 142.3
Deferred Tax Assets, Inventory 2.4 0.0
Deferred Tax Assets, Property, Plant and Equipment 187.0 318.8
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards 166.9 254.9
Deferred Tax Assets, Accrued Expenses 0.9 7.9
Deferred Tax Assets, Long-Term Debt and Financing Costs 17.3 8.0
Deferred Tax Assets, Other 5.5 8.6
Deferred Tax Assets, Gross 459.9 740.5
Deferred Tax Assets, Valuation Allowance (440.7) (702.2)
Deferred Tax Assets, Net of Valuation Allowance 19.2 38.3
Deferred Tax Liabilities, Inventory 0.0 2.6
Deferred Tax Liabilities, Intangible Assets 17.7 33.0
Deferred Tax Liabilities, Prepaid Expenses 1.5 2.7
Deferred Tax Liabilities $ 19.2 $ 38.3