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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 30, 2025
Dec. 31, 2024
Accounts and other receivables    
Trade receivables $ 51.4 $ 45.8
Derivative financial instruments 0.3 0.0
Total accounts and other receivables 54.2 58.8
Inventories    
Raw materials and supplies 33.9 29.9
Work-in-process 26.0 25.5
Finished goods 26.5 28.2
Total inventories 86.4 83.6
Property, plant and equipment, net    
Total property, plant and equipment 286.5 280.7
Accumulated depreciation and impairment (223.6) (217.9)
Total property, plant and equipment, net 62.9 62.8
Other current liabilities    
Restructuring provision 0.1 0.2
Short term provision 0.4 9.1
Deferred consideration payable 1.6 1.6
Derivative financial instruments 0.0 0.9
Operating lease liability 4.2 4.0
Advance payments 3.0 2.8
Total other current liabilities $ 9.3 $ 18.6
Operating lease, liability, current, statement of financial position [extensible enumeration] Total other current liabilities Total other current liabilities
Other non-current liabilities    
Contingent liabilities $ 2.5 $ 2.3
Operating lease liability 10.0 10.7
Other non-current liabilities 0.1 0.1
Total other non-current liabilities $ 12.6 $ 13.1
Operating lease, liability, noncurrent, statement of financial position [extensible enumeration] Total other non-current liabilities Total other non-current liabilities
Related Party    
Accounts and other receivables    
Related parties $ 0.1 $ 0.1
Other receivables 0.1 0.1
Nonrelated Party    
Accounts and other receivables    
Related parties 2.4 12.9
Other receivables 2.4 12.9
Land, buildings and leasehold improvements    
Property, plant and equipment, net    
Total property, plant and equipment 50.1 49.2
Machinery and equipment    
Property, plant and equipment, net    
Total property, plant and equipment 224.1 218.8
Construction in progress    
Property, plant and equipment, net    
Total property, plant and equipment $ 12.3 $ 12.7