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Earnings Per Share - Antidilutive (Details) (Options and performance shares)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Options and performance shares
       
Antidilutive securities excluded from computation of earnings per share        
Shares not included in diluted earnings per share 0 2.4 0 2.4