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Income Taxes (Deferred Taxes) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Deferred tax assets, plant lease turnover and other exit costs | $ 15.8 | $ 15.6
Deferred tax assets, employee benefit costs | 215.0 | 191.7
Deferred tax assets, inventory | 15.9 |
Deferred tax assets, property, plant and equipment | 490.5 | 75.0
Deferred tax assets, tax intangibles | 0.3 | 0.9
Deferred tax assets, deferred costs for depleted uranium | 3.4 | 56.8
Deferred tax assets, net operating loss and credit carryforwards | 35.5 | 22.3
Deferred tax assets, accrued expenses | 7.1 | 7.7
Deferred tax assets, prepaid expenses | 2.4 |
Deferred tax assets, other | 8.0 | 7.0
Deferred tax assets, gross, total | 793.9 | 377.0
Deferred tax asssets, valuation allowance | (793.9) | (370.6)
Deferred tax assets, net |  | 6.4
Deferred tax liabilities, inventory |  | 1.5
Deferred tax liabilities, prepaid expenses |  | 1.1
Deferred tax liabilities, dividends on preferred stock |  | 3.8
Deferred tax liabilities |  | $ 6.4

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