Net Income Per Share - Computation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Earnings Per Share, Basic and Diluted [Abstract]
Net income	$ 44.7	$ 54.5
Shares outstanding
Weighted average common shares outstanding (in shares)	133.7	133.4
Effect of dilutive stock awards (in shares)	1.3	0.7
Weighted average common shares outstanding and potential common shares (in shares)	135.0	134.1
Net income per share
Basic (in dollars per share)	$ 0.33	$ 0.41
Diluted (in dollars per share)	$ 0.33	$ 0.41