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Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Deferred Tax Assets, Employee Benefits Costs | $ 73.6 | $ 79.9
Deferred Tax Assets, Inventory | 11.1 | 2.4
Deferred Tax Assets, Property, Plant and Equipment | 185.9 | 187.0
Deferred Tax Assets, Net Operating Loss and Credit Carryforwards | 187.1 | 166.9
Deferred Tax Assets, Accrued Expenses | 0.9 | 0.9
Deferred Tax Assets, Depleted Uranium and Stored Wastes | 15.3 | 17.3
Deferred Tax Assets, Other | 0.2 | 5.5
Deferred Tax Assets, Gross | 474.1 | 459.9
Deferred Tax Assets, Valuation Allowance | (456.6) | (440.7)
Deferred Tax Assets, Net of Valuation Allowance | 17.5 | 19.2
Deferred Tax Liabilities, Intangible Assets | 16.0 | 17.7
Deferred Tax Liabilities, Prepaid Expenses | 1.5 | 1.5
Deferred Tax Liabilities | $ 17.5 | $ 19.2

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