Leases - Weighted Average (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Leases [Abstract]
Operating lease liabilities arising from obtaining right-of-use assets	$ 2.2	$ 3.8	$ 4.1	$ 4.8
Finance lease liabilities arising from obtaining right-of-use assets	$ 5.8	$ 0.8	$ 5.8	$ 1.2
Weighted-average remaining lease term (in years):
Operating leases	4 years 10 months 17 days	5 years 4 months 9 days	4 years 10 months 17 days	5 years 4 months 9 days
Finance leases	16 years 4 months 17 days	18 years 3 days	16 years 4 months 17 days	18 years 3 days
Weighted-average discount rate:
Operating leases	6.50%	6.50%	6.50%	6.50%
Finance leases	6.51%	6.52%	6.51%	6.52%