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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Unrecognized tax benefits    
Decrease in our gross unrecognized tax benefits $ 450.6  
Reduction to income tax expense 318.6  
Increases to the amount of unrecognized tax benefits   36.7
Income before income taxes:    
Foreign earnings 900  
Deferred tax liability on foreign earnings $ 316.5 $ 316.5