Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 27, 2019	Dec. 28, 2018
Leases [Abstract]
Operating lease right-of-use asset	$ 162.1	$ 0.0
Property, plant and equipment, net	1.3
Total lease assets	163.4
Current maturities of operating leases	32.5	0.0
Current maturities of debt and finance leases	0.3
Operating leases, less current maturities	102.7	$ 0.0
Long-term debt and finance leases, less current maturities	0.2
Total lease liabilities	$ 135.7
Operating leases, Weighted-average remaining lease term (years)	8 years 4 months 24 days
Finance leases, Weighted-average remaining lease term (years)	1 year 10 months 24 days
Operating leases, Weighted-average discount rate (percentage)	8.31%
Finance leases, Weighted-average discount rate (percentage)	4.44%