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Income Taxes Income Taxes (Deferred Income Taxes) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred Tax Assets, Plant Lease Turnover and Other Exit Costs $ 3.1 $ 0.9
Deferred Tax Assets, Employee Benefits Costs 137.7 148.5
Deferred Tax Assets, Inventory 3.1 6.6
Deferred Tax Assets, Property, Plant and Equipment 437.1 450.2
Deferred Tax Assets, Waste Disposition 0.3 1.3
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards 114.3 76.7
Deferred Tax Assets, Accrued Expenses 8.8 5.4
Deferred Tax Assets, Other 11.9 14.6
Deferred Tax Assets, Gross 716.3 704.2
Deferred Tax Assets, Valuation Allowance (676.4) (659.6)
Deferred Tax Assets, Net of Valuation Allowance 39.9 44.6
Deferred Tax Liabilities, Intangible Assets 37.3 42.0
Deferred Tax Liabilities, Prepaid Expenses 2.6 2.6
Deferred Tax Liabilities $ 39.9 $ 44.6