Leases - Cash Paid (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Leases [Abstract]
Finance lease - cash paid for interest	$ 0.7	$ 0.6	$ 2.0	$ 1.9
Finance lease - financing cash flows	0.3	0.2	0.7	0.5
Operating lease - operating cash flows (fixed payments)	$ 2.9	$ 2.9	$ 8.7	$ 10.2