Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Basis of Presentation - Computation of Basic and Diluted Earnings Per Share (Detail) - shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]      
Weighted-average shares used in basic computations 140.2 158.5 166.1
Dilutive effect of exercise of equity grants outstanding 6.3 7.2 6.1
Dilutive effect of 2019 Convertible Notes 3.0    
Weighted-average shares used in diluted computations 149.5 165.7 172.2