Leases - Weighted Average (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019
Leases [Abstract]
Operating lease liabilities arising from obtaining right-of-use assets, including impact of ASC 842 adoption	$ 10.2	$ 59.3
Finance lease liabilities arising from obtaining right-of-use assets, including impact of ASC 842 adoption	$ 1.1	$ 39.6
Weighted-average remaining lease term (in years):
Operating leases	5 years 5 months 15 days	5 years 9 months 7 days
Finance leases	17 years 8 months 4 days	18 years 10 months 28 days
Weighted-average discount rate:
Operating leases	6.50%	6.50%
Finance leases	6.52%	6.52%