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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share from Continuing Operations (Parenthetical) (Detail)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Stock based awards excluded from the calculation of diluted earnings per share 6.5 8.3 7.6 7.5