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Income Taxes Income Taxes (Deferred Income Taxes) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred Tax Assets, Plant Lease Turnover and Other Exit Costs $ 0.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations $ 17.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Deferred Tax Assets, Employee Benefits Costs 148.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 119.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Deferred Tax Assets, Inventory 6.6us-gaap_DeferredTaxAssetsInventory 10.1us-gaap_DeferredTaxAssetsInventory
Deferred Tax Assets, Property, Plant and Equipment 450.2us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 508.8us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Assets, Depleted Uranium and Stored Wastes 1.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 2.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards 76.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 89.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Accrued Expenses 5.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 4.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred Tax Assets, Other 14.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 12.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Deferred Tax Assets, Gross 704.2us-gaap_DeferredTaxAssetsGross 765.1us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (659.6)us-gaap_DeferredTaxAssetsValuationAllowance (763.5)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net of Valuation Allowance 44.6us-gaap_DeferredTaxAssetsNet 1.6us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Intangible Assets 42.0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Deferred Tax Liabilities, Prepaid Expenses 2.6us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts 1.6us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts
Deferred Tax Liabilities $ 44.6us-gaap_DeferredTaxLiabilities $ 1.6us-gaap_DeferredTaxLiabilities