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Income Taxes Income Taxes (Deferred Income Taxes) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred Tax Assets, Plant Lease Turnover and Other Exit Costs $ 17.4 $ 15.8
Deferred Tax Assets, Employee Benefits Costs 119.7 215.0
Deferred Tax Assets, Inventory 10.1 15.9
Deferred Tax Assets, Property, Plant and Equipment 508.8 490.5
Deferred Tax Assets, Tax Intangibles 0 0.3
Deferred Tax Assets, Depleted Uranium and Stored Wastes 2.9 3.4
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards 89.2 35.5
Deferred Tax Assets, Accrued Expenses 4.7 7.1
Deferred Tax Assets, Prepaid Expenses 0 2.4
Deferred Tax Assets, Other 12.3 8.0
Deferred Tax Assets, Gross 765.1 793.9
Deferred Tax Assets, Valuation Allowance (763.5) (793.9)
Deferred Tax Assets, Net of Valuation Allowance 1.6 0
Deferred Tax Liabilities, Prepaid Expenses 1.6 0
Deferred Tax Liabilities $ 1.6 $ 0