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
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Weighted average shares used in basic computations 83.1 82.8
Dilutive effect of exercise of equity grants outstanding 3.6 2.8
Weighted average shares used in diluted computations 86.7 85.6