CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Apr. 02, 2023
Income Statement [Abstract]
Net sales		$ 89.4	$ 101.3
Cost of goods sold		(71.0)	(80.2)
Gross profit		18.4	21.1
Selling, general and administrative expenses		(11.6)	(12.5)
Research and development		(1.2)	(1.2)
Restructuring charges		(0.7)	(0.3)
Acquisition and disposal related costs		(0.2)	0.0
Other income		0.2	0.0
Operating income		4.9	7.1
Interest expense		(1.4)	(1.3)
Defined benefit pension credit / (charge)		0.3	(8.9)
Income / (loss) before income taxes		3.8	(3.1)
(Provision) / credit for income taxes		(1.0)	3.6
Net income from continuing operations		2.8	0.5
Net (loss) / income from discontinued operations		(0.1)	0.0
Net income		$ 2.7	$ 0.5
Earnings per share
Basic from continuing operations (in USD per share)	[1]	$ 0.10	$ 0.02
Basic from discontinued operations (in USD per share)	[1],[2]	0	0
Basic earnings per ordinary share (in USD per share)	[1]	0.10	0.02
Diluted from continuing operations (in USD per share)	[1]	0.10	0.02
Diluted from discontinued operations (in USD per share)	[1],[2]	0	0
Diluted earnings per ordinary share (in USD per share)	[1]	$ 0.10	$ 0.02
Weighted average ordinary shares outstanding
Basic (in shares)		26,820,968	26,921,010
Diluted (in shares)		26,866,976	27,071,494

[1] The calculation of earnings per share is performed separately for continuing and discontinued operations. As a result, the sum of the two in any particular period may not equal the earnings-per-share amount in total.

[2] The loss per share for discontinued operations in the First Quarter of 2024 has not been diluted, since the incremental shares included in the weighted-average number of shares outstanding would have been anti-dilutive.