Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Dec. 29, 2019
Revenue from Contract with Customer [Abstract]
Revenue recognized	$ 5.7	$ 5.4	$ 20.0	$ 21.3
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract assets	186.4		186.4		$ 179.4
Contract assets, net change			7.0
Contract liabilities, net change			0.1
Unbilled Revenues | T for C
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract assets	11.5		11.5		11.5
Unbilled Revenues | International Customer
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract assets	$ 10.0		$ 10.0		$ 10.0