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Income Taxes (Deferred Taxes) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
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