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Income Taxes (India - MAT And Unrecognized Tax Benefit Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Income Taxes [Abstract]    
Expense recognized for accrued interest and penalties $ 1.52  
Accrued interest and penalties related to unrecognized tax benefits 1.56 0.06
Liability for unrecognized tax benefits 20.55 18.41
Unrecognized tax benefits, tax disputes 1.94  
Unrecognized tax benefits, potential tax disputes $ 3.63