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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Apr. 02, 2023
Dec. 31, 2022
Accounts and other receivables    
Trade receivables $ 62.0 $ 56.4
Related parties 0.1 0.1
Prepayments and accrued income 6.5 6.6
Derivative financial instruments 0.1 0.7
Other receivables 5.5 4.0
Total accounts and other receivables 74.2 67.8
Inventories    
Raw materials and supplies 55.9 42.7
Work-in-process 44.3 44.0
Finished goods 29.2 24.4
Total inventories 129.4 111.1
Property, plant and equipment, net    
Total property, plant and equipment 330.2 323.6
Accumulated depreciation and impairment (252.6) (245.9)
Total property, plant and equipment, net 77.6 77.7
Other current liabilities    
Restructuring provision 3.8 3.7
Short term provision 0.0 0.1
Derivative financial instruments 0.2 0.4
Operating lease liability 5.5 4.7
Advance payments 2.3 2.3
Total other current liabilities $ 11.8 $ 11.2
Operating lease, liability, current, statement of financial position [extensible enumeration] Total other current liabilities Total other current liabilities
Other non-current liabilities    
Contingent liabilities $ 0.5 $ 0.7
Operating lease liability 16.8 18.2
Other non-current liabilities 0.2 0.1
Total other non-current liabilities $ 17.5 $ 19.0
Operating lease, liability, noncurrent, statement of financial position [extensible enumeration] Total other non-current liabilities Total other non-current liabilities
Land, buildings and leasehold improvements    
Property, plant and equipment, net    
Total property, plant and equipment $ 59.7 $ 58.9
Machinery and equipment    
Property, plant and equipment, net    
Total property, plant and equipment 258.8 254.9
Construction in progress    
Property, plant and equipment, net    
Total property, plant and equipment $ 11.7 $ 9.8