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INCOME AND FRANCHISE TAXES (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
INCOME AND FRANCHISE TAXES    
Change in valuation allowance recognized as income tax expense (benefit) $ 119.8  
Valuation allowance for net deferred tax assets 14.3  
Net deferred tax assets $ 130.0 $ 147.5