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Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Earnings Per Share [Abstract]        
Weighted-average common shares outstanding 57.2 58.0 57.6 58.1
Effect of dilutive securities 1.1 1.3 1.3 1.3
Weighted-average common shares outstanding, assuming dilution 58.3 59.3 58.9 59.4