Note 8 - Supplementary Balance Sheet Information (Details) - USD ($) $ in Millions	Mar. 29, 2026	Dec. 31, 2025
Derivative financial instruments	$ 0.0	$ 0.3
Other receivables	4.2	4.9
Total accounts and other receivables	59.3	50.0
Raw materials and supplies	36.3	31.4
Work-in-process	27.0	26.8
Finished goods	37.5	34.2
Total inventories	100.8	92.4
Property, plant and equipment	284.2	284.3
Accumulated depreciation and impairment	(224.4)	(224.1)
Total property, plant and equipment, net	59.8	60.2
Loan notes	25.0	25.0
Total current maturities of long-term debt and short-term borrowings	25.0	25.0
Restructuring provision	1.1	0.4
Short term provision	3.3	3.5
Deferred consideration payable	1.7	1.8
Derivative financial instruments	0.1	0.0
Operating lease liability	3.8	4.2
Advance payments	7.0	6.1
Total other current liabilities	17.0	16.0
Contingent liabilities	3.0	4.0
Operating lease liability	7.3	8.0
Other non-current liabilities	0.1	0.2
Total other non-current liabilities	10.4	12.2
Land, Buildings and Improvements [Member]
Property, plant and equipment	48.7	48.0
Machinery and Equipment [Member]
Property, plant and equipment	222.0	220.9
Construction in Progress [Member]
Property, plant and equipment	13.5	15.4
Nonrelated Party [Member]
Trade receivables	55.0	44.6
Related Party [Member]
Trade receivables	$ 0.1	$ 0.2