Leases - Cash Paid (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Leases [Abstract]
Finance lease - cash paid for interest	$ 0.6	$ 0.6	$ 1.9	$ 1.9
Finance lease - financing cash flows	0.2	0.1	0.5	0.4
Operating lease - operating cash flows (fixed payments)	$ 2.9	$ 3.6	$ 10.2	$ 10.9