Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 28, 2019	Dec. 28, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 182.1	$ 0.0
Finance lease assets	1.2
Total lease assets	183.3
Current maturities of operating leases	49.9	0.0
Finance lease liabilities	0.4
Operating leases, less current maturities	104.6	$ 0.0
Finance lease liabilities, less current maturities	0.4
Lease Liabilities	$ 155.3
Operating leases, Weighted-average remaining lease term	7 years 4 months 24 days
Finance leases, Weighted-average remaining lease term	1 year 10 months 24 days
Operating leases, Weighted-average discount rate	8.92%
Finance leases, Weighted-average discount rate	4.44%