Leases - Supplemental Balance Sheet (Details) - USD ($) $ in Millions	Dec. 27, 2020	Dec. 29, 2019
Operating Leases:
Operating lease right-of-use assets	$ 42.9	$ 42.1
Current portion of operating lease liabilities	8.9	9.9
Operating lease liabilities, net of current portion	38.6	37.6
Finance leases:
Property, plant and equipment, net	36.5	38.1
Other current liabilities	0.9	0.6
Other long-term liabilities	$ 38.8	$ 38.4
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent