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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jan. 01, 2007
Income Taxes [Abstract]          
Gross unrecognized tax benefits $ 0 $ 0 $ 0 $ 0 $ 16.4
Federal income tax expense 0 0 0 0  
Accrued interest and penalties related to uncertain tax provisions $ 0 $ 0 $ 0 $ 0