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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 27, 2021
Dec. 31, 2020
Accounts and other receivables    
Trade receivables $ 49.3 $ 33.6
Related parties 0.2 0.2
Prepayments and accrued income 5.0 5.5
Derivative financial instruments 0.2 0.2
Deferred consideration 0.2 0.2
Other receivables 2.6 3.4
Total accounts and other receivables 57.5 43.1
Inventories    
Raw materials and supplies 33.1 26.2
Work-in-process 24.7 19.7
Finished goods 19.5 22.9
Total inventories 77.3 68.8
Other current assets    
Income tax receivable 1.1 1.5
Total other current assets 1.1 1.5
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 340.5 328.3
Accumulated depreciation and impairment (249.7) (242.3)
Total property, plant and equipment, net 90.8 86.0
Other current liabilities    
Restructuring related liabilities 9.1 9.0
Contingent liabilities 1.4 1.1
Derivative financial instruments $ 0.1 0.4
Operating lease, liability, current, statement of financial position [extensible enumeration] Total other current liabilities  
Operating lease liability $ 2.0 2.9
Other current liabilities 0.7 0.1
Total other current liabilities 13.3 13.5
Other non-current liabilities    
Contingent liabilities $ 0.8 1.0
Operating lease, liability, noncurrent, statement of financial position [extensible enumeration] Total other non-current liabilities  
Operating lease liability $ 7.1 6.7
Total other non-current liabilities 7.9 7.7
Land, buildings and leasehold improvements    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 67.4 65.2
Machinery and equipment    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 267.2 255.3
Construction in progress    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment $ 5.9 $ 7.8