Employee Retirement and Pension Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Retirement Benefits [Abstract]
Company contribution	$ 1.1	$ 3.1	$ 2.7	$ 6.1
Voluntary contribution	$ 1.7	$ 0.1	$ 1.7	$ 0.1