Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 29.9	$ 16.9	$ 76.0	$ 50.6
Foreign currency translation adjustments	0.2	0.3	(0.1)	0.6
Unrealized gain (loss) on interest rate swaps, net of taxes	0.4	(0.2)	2.1	(0.2)
Comprehensive income	$ 30.5	$ 17.0	$ 78.0	$ 51.0