Earnings Per Share - Computations of Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Income from continuing operations, net of tax	$ 136.6	$ 136.5	$ 366.8	$ 324.2
Loss from discontinued operations, net of tax	0.0	0.0	0.0	(1.0)
Net income	$ 136.6	$ 136.5	$ 366.8	$ 323.2
Continuing operations	$ 1.1	$ 1.08	$ 2.93	$ 2.55
Discontinued operations	0	0	0	0
Basic earnings per share	1.1	1.08	2.93	2.55
Continuing operations	1.09	1.07	2.91	2.53
Discontinued operations	0	0	0	0
Diluted earnings per share	$ 1.09	$ 1.07	$ 2.91	$ 2.53
Basic average shares outstanding	124.2	126.9	125.1	127.1
Stock-based awards	0.9	0.9	0.9	0.8
Diluted average shares outstanding	125.1	127.8	126.0	127.9
Antidilutive stock-based awards excluded from weighted- average number of shares outstanding for diluted earnings per share	0.7	0.8	0.8	0.9

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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