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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]        
Tax expense $ 226.6 $ 334.5 $ 1,038.9 $ 1,192.8
Effective tax rate 25.70% 32.60% 30.70% 35.20%