Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Net Income Per Common Share
Net income	$ 183.8	$ 79.7	$ 393.3	$ 213.9
Weighted average number of common shares outstanding	83.0	83.4	83.0	83.4
Dilutive shares (additional common shares issuable under stock-based awards)	0.8	0.4	0.9	0.5
Weighted average number of common shares outstanding, assuming dilution	83.8	83.8	83.9	83.9
Net income per common share (in dollars per share)	$ 2.21	$ 0.96	$ 4.74	$ 2.56
Net income per common share, assuming dilution (in dollars per share)	$ 2.19	$ 0.95	$ 4.69	$ 2.55