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Income Taxes Income Taxes (Deferred Income Taxes) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred Tax Assets, Employee Benefits Costs $ 139.3 $ 140.8
Deferred Tax Assets, Inventory 0.0 3.1
Deferred Tax Assets, Property, Plant and Equipment 318.8 437.1
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards 254.9 114.3
Deferred Tax Assets, Accrued Expenses 14.9 9.1
Deferred Tax Assets, Other 12.6 11.9
Deferred Tax Assets, Gross 740.5 716.3
Deferred Tax Assets, Valuation Allowance (702.2) (676.4)
Deferred Tax Assets, Net of Valuation Allowance 38.3 39.9
Deferred Tax Liabilities, Inventory 2.6  
Deferred Tax Liabilities, Intangible Assets 33.0 37.3
Deferred Tax Liabilities, Prepaid Expenses 2.7 2.6
Deferred Tax Liabilities $ 38.3 $ 39.9