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Earnings Per Share (Details 2) (Options and performance shares)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Options and performance shares
       
Antidilutive securities excluded from computation of earnings per share        
Shares not included in diluted earnings per share 2.2 3.3 2.2 3.3