Leases - Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 28, 2019	Jun. 28, 2019
Leases [Abstract]
Amortization of lease assets	$ 0.0	$ 0.1
Operating lease cost	23.4	46.7
Short-term lease cost	1.9	4.3
Variable lease cost	1.6	2.9
Total lease cost	26.9	54.0
Operating cash flows for operating leases	21.6	42.1
Financing cash flows for finance leases	$ 0.2	$ 0.3