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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 28, 2021
Dec. 31, 2020
Accounts and other receivables    
Trade receivables $ 48.8 $ 33.6
Related parties 0.2 0.2
Prepayments and accrued income 4.2 5.5
Derivative financial instruments 0.3 0.2
Deferred consideration 0.2 0.2
Other receivables 2.3 3.4
Total accounts and other receivables 56.0 43.1
Inventories    
Raw materials and supplies 30.6 26.2
Work-in-process 24.0 19.7
Finished goods 21.0 22.9
Total inventories 75.6 68.8
Other current assets    
Income tax receivable 1.1 1.5
Total other current assets 1.1 1.5
Property, plant and equipment, net    
Total property, plant and equipment 339.8 328.3
Accumulated depreciation and impairment (245.9) (242.3)
Total property, plant and equipment, net 93.9 86.0
Other current liabilities    
Contingent liabilities 11.5 10.1
Derivative financial instruments 0.3 0.4
Operating lease liability 2.0 2.9
Other current liabilities 0.2 0.1
Total other current liabilities 14.0 13.5
Other non-current liabilities    
Contingent liabilities 1.0 1.0
Operating lease liability 7.2 6.7
Total other non-current liabilities 8.2 7.7
Land, buildings and leasehold improvements    
Property, plant and equipment, net    
Total property, plant and equipment 65.5 65.2
Machinery and equipment    
Property, plant and equipment, net    
Total property, plant and equipment 269.2 255.3
Construction in progress    
Property, plant and equipment, net    
Total property, plant and equipment $ 5.1 $ 7.8