Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Net Income Per Common Share
Net income available to common shareholders	$ 150.5	$ 144.6	$ 364.4	$ 141.1
Weighted average number of common shares outstanding	83.5	84.0	83.4	84.2
Dilutive shares (additional common shares issuable under stock-based awards)	0.5	0.8	0.6	0.9
Weighted average number of common shares outstanding, assuming dilution	84.0	84.8	84.0	85.1
Net income per common share (in dollars per share)	$ 1.80	$ 1.72	$ 4.37	$ 1.68
Net income per common share, assuming dilution (in dollars per share)	$ 1.79	$ 1.71	$ 4.34	$ 1.66