Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Weighted-average shares used in basic computations 136.2 159.1 141.3 162.7
Dilutive effect of exercise of equity grants outstanding 6.0 6.8 6.8 7.4
Dilutive effect of 2019 Convertible Notes 3.4   2.7  
Weighted-average shares used in diluted computations 145.6 165.9 150.8 170.1