Leases - Weighted Average (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Leases [Abstract]
Operating lease liabilities arising from obtaining right-of-use assets, including impact of ASC 842 adoption	$ 3.8	$ 4.3	$ 4.8	$ 60.1
Finance lease liabilities arising from obtaining right-of-use assets, including impact of ASC 842 adoption	$ 0.8	$ 0.0	$ 1.2	$ 39.6
Weighted-average remaining lease term (in years):
Operating leases	5 years 4 months 9 days	5 years 9 months 14 days	5 years 4 months 9 days	5 years 9 months 14 days
Finance leases	18 years 3 days	19 years 2 months 1 day	18 years 3 days	19 years 2 months 1 day
Weighted-average discount rate:
Operating leases	6.50%	6.50%	6.50%	6.50%
Finance leases	6.52%	6.53%	6.52%	6.53%