Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Weighted average shares used in basic computations 81.4 83.0 82.3 82.9
Dilutive effect of exercise of equity grants outstanding 3.9   3.7 3.0
Weighted average shares used in diluted computations 85.3 83.0 86.0 85.9