Leases - Cash Paid (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jul. 01, 2018
Leases [Abstract]
Finance lease - cash paid for interest	$ 0.6	$ 1.2
Finance lease - financing cash flows	0.1	0.2	$ 0.0
Operating lease - operating cash flows (fixed payments)	$ 4.0	$ 7.3