Leases - Supplemental Consolidated Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 30, 2018
ROU Assets:
Operating lease right-of-use assets	$ 66.9	$ 0.0
Finance lease ROU assets	1.7
Total lease assets	68.6
ROU Liabilities:
Operating lease current liabilities	20.3	0.0
Finance lease current liabilities	0.4
Operating lease noncurrent liabilities	49.3	$ 0.0
Finance lease noncurrent liabilities	1.1
Total lease liabilities	$ 71.1