Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 27, 2020	Dec. 28, 2019
Finance leases:
Property and equipment - gross	$ 9.8	$ 9.2
Accumulated depreciation and amortization	(2.3)	(1.5)
Property and equipment - net	7.5	7.7
Other accrued liabilities	2.9	2.8
Other long-term liabilities	8.9	10.0
Total finance lease liabilities	11.8	12.8
Operating leases:
Operating lease right-of-use assets	50.2	55.6
Other accrued liabilities	18.1	19.5
Operating lease liabilities	33.4	37.5
Total operating lease liabilities	$ 51.5	$ 57.0
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent