Leases - Supplemental Cash Flow and Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Dec. 29, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows related to operating leases	$ 63.8	$ 54.7
Operating cash flows related to finance leases	0.5	0.5
Financing cash flows related to finance leases	7.5	8.3
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	116.7	49.0
Finance leases	8.3	$ 0.0
Operating Leases
Operating lease right-of-use assets	927.8		$ 811.1
Accumulated amortization	(117.9)		(75.2)
Operating lease right-of-use assets, net	809.9		735.9
Other accrued expenses	76.0		68.6
Operating lease liabilities	778.3		709.5
Total operating lease liabilities	854.3		778.1
Finance Leases
Property and equipment, gross	134.8		127.4
Accumulated depreciation	(98.5)		(90.9)
Property and equipment, net	36.3		36.5
Other accrued expenses	11.6		12.4
Other liabilities	14.7		12.6
Total finance lease liabilities	$ 26.3		$ 25.0
Weighted Average Remaining Lease Term (Years)
Operating leases	11 years 6 months 18 days		11 years 9 months 21 days
Finance leases	2 years 10 months 13 days		1 year 6 months 29 days
Weighted Average Discount Rate
Operating leases	5.60%		5.70%
Finance leases	3.70%		4.60%