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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share [Abstract]        
Stock based awards excluded from the calculation of diluted earnings per share 7.8 7.5 7.7 7.4