Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail)

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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Weighted average shares used in basic computations 82.6 86.1 82.5 90.7
Dilutive effect of exercise of equity grants outstanding 2.6 5.1 2.3 5.2
Weighted average shares used in diluted computations 85.2 91.2 84.8 95.9