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Segmental Information - Reconciliation of Consolidated Segment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Segment Reporting [Abstract]
Adjusted EBITDA	$ 13.8	$ 13.7	$ 48.8	$ 40.1
Other share-based compensation charges	(0.8)	(0.8)	(2.2)	(2.1)
Depreciation and amortization	(3.8)	(3.4)	(11.2)	(10.0)
Restructuring charges	(0.5)	(4.2)	(2.1)	(7.8)
Acquisition and disposal related costs	(0.6)	0.0	(1.5)	(0.2)
Other charges	0.0	0.0	(1.1)	0.0
Defined benefits pension credit	0.6	1.1	1.8	3.3
Interest expense, net	(0.8)	(1.2)	(2.4)	(3.5)
Provision for income taxes	(1.9)	(2.8)	(3.6)	(5.6)
Net income from continuing operations	$ 6.0	$ 2.4	$ 26.5	$ 14.2

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