Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Sep. 26, 2020	Dec. 28, 2019
Finance leases:
Property and equipment - gross	$ 10.0	$ 9.2
Accumulated depreciation and amortization	(2.8)	(1.5)
Property and equipment - net	7.2	7.7
Other accrued liabilities	2.7	2.8
Other long-term liabilities	8.2	10.0
Total finance lease liabilities	10.9	12.8
Operating leases:
Operating lease right-of-use assets	51.0	55.6
Other accrued liabilities	18.8	19.5
Operating lease liabilities	33.6	37.5
Total operating lease liabilities	$ 52.4	$ 57.0
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent
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