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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 26, 2022
Dec. 31, 2021
Accounts and other receivables    
Trade receivables $ 65.8 $ 45.8
Related parties 0.0 0.1
Prepayments and accrued income 5.4 8.5
Derivative financial instruments 0.2 0.1
Deferred consideration 1.0 1.0
Other receivables 2.8 2.3
Total accounts and other receivables 75.2 57.8
Inventories    
Raw materials and supplies 45.3 39.3
Work-in-process 34.9 26.7
Finished goods 24.5 24.5
Total inventories 104.7 90.5
Property, plant and equipment, net    
Total property, plant and equipment 322.1 339.3
Accumulated depreciation and impairment (242.8) (251.8)
Total property, plant and equipment, net 79.3 87.5
Other current liabilities    
Restructuring provision 6.4 11.7
Short term provision 0.6 0.2
Derivative financial instruments 0.5 0.1
Operating lease liability 4.7 3.0
Advance payments 5.7 4.6
Total other current liabilities $ 17.9 $ 19.6
Operating lease, liability, current, statement of financial position [extensible enumeration] Total other current liabilities Total other current liabilities
Other non-current liabilities    
Contingent liabilities $ 0.4 $ 1.8
Operating lease liability 16.1 9.8
Other non-current liabilities 0.1 0.0
Total other non-current liabilities $ 16.6 $ 11.6
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 $ 59.1 $ 64.6
Machinery and equipment    
Property, plant and equipment, net    
Total property, plant and equipment 254.2 266.3
Construction in progress    
Property, plant and equipment, net    
Total property, plant and equipment $ 8.8 $ 8.4