Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 29, 2019	Dec. 28, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 192.2	$ 0.0
Finance lease assets	1.3
Total lease assets	193.5
Current maturities of operating leases	56.0	0.0
Finance lease liabilities, Current	0.4
Operating leases, less current maturities	109.5	$ 0.0
Finance lease liabilities, less current maturities	0.5
Lease Liabilities	$ 166.4
Operating leases, Weighted-average remaining lease term	7 years 2 months 12 days
Finance leases, Weighted-average remaining lease term	2 years 2 months 12 days
Operating leases, Weighted-average discount rate	8.41%
Finance leases, Weighted-average discount rate	4.42%