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Income Taxes Income Taxes (Deferred Income Taxes) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from asset retirement obligations. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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