Segment Information - Reconciliation of Consolidated Segment Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 26, 2021	Jun. 27, 2021	Mar. 28, 2021	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting [Abstract]
Adjusted EBITDA									$ 63.4	$ 53.9	$ 67.1
Share based compensation charges									(2.8)	(2.8)	(4.5)
Loss on disposal of property, plant and equipment									0.0	(0.1)	(0.2)
Depreciation and amortization									(15.6)	(13.3)	(13.2)
Unwind discount on deferred consideration									0.0	0.0	(0.2)
Restructuring charges									(6.2)	(8.9)	(25.9)
Impairment credit									0.0	0.0	0.2
Acquisition costs									(1.5)	0.0	(1.4)
Other charges									(1.1)	(0.4)	(2.5)
Defined benefits pension credit									2.3	4.3	1.3
Interest expense, net									(3.1)	(5.0)	(4.4)
Provision for income taxes									(5.4)	(6.9)	(7.6)
Net income from continuing operations	$ 3.5	$ 6.0	$ 11.9	$ 8.6	$ 6.6	$ 2.4	$ 4.6	$ 7.2	$ 30.0	$ 20.8	$ 8.7