Revenue - Schedule of Revenue to External Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Revenue, net	$ 456.8	$ 455.6	$ 931.0	$ 883.3
United States
Disaggregation of Revenue [Line Items]
Revenue, net	350.1	305.6	684.7	595.2
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue, net	25.6	42.2	68.1	88.3
Canada
Disaggregation of Revenue [Line Items]
Revenue, net	14.0	17.9	30.1	33.7
All other countries
Disaggregation of Revenue [Line Items]
Revenue, net	$ 67.1	$ 89.9	$ 148.1	$ 166.1