Net Income Per Share - Computation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 45.6	$ 41.8	$ 51.3	$ 54.5	$ 46.6	$ 39.0	$ 49.8	$ 48.3	$ 193.2	$ 183.7	$ 161.4
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average common shares outstanding (in shares)									133.4	133.4	133.4
Effect of dilutive stock awards (in shares)									1.0	0.7	0.7
Weighted average common shares outstanding and potential common shares (in shares)									134.4	134.1	134.1
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 0.34	$ 0.31	$ 0.38	$ 0.41	$ 0.35	$ 0.29	$ 0.37	$ 0.36	$ 1.45	$ 1.38	$ 1.21
Diluted (in dollars per share)	$ 0.34	$ 0.31	$ 0.38	$ 0.41	$ 0.35	$ 0.29	$ 0.37	$ 0.36	$ 1.44	$ 1.37	$ 1.20