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Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Earnings Per Share [Abstract]        
Weighted-average common shares outstanding (in shares) 56.4 57.8 56.6 57.9
Effect of dilutive securities (in shares) 0.9 1.2 1.0 1.3
Diluted (in shares) 57.3 59.0 57.6 59.2