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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 27, 2020
Dec. 31, 2019
Accounts and other receivables    
Trade receivables $ 45.2 $ 52.4
Related parties 0.1 2.7
Prepayments and accrued income 6.4 6.7
Derivative financial instruments 0.1 0.3
Deferred consideration 0.5 0.0
Other receivables 3.6 4.2
Total accounts and other receivables 55.9 66.3
Inventories    
Raw materials and supplies 30.0 33.4
Work-in-process 26.4 32.2
Finished goods 28.3 28.9
Total inventories 84.7 94.5
Other current assets    
Held-for-sale assets 3.7 3.9
Income tax receivable 0.6 1.1
Total other current assets 4.3 5.0
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 362.7 364.7
Accumulated depreciation and impairment (270.4) (265.8)
Total property, plant and equipment, net 92.3 98.9
Other current liabilities    
Contingent liabilities 9.5 6.6
Derivative financial instruments 0.1 0.0
Operating lease liability 3.0 3.3
Other current liabilities 1.7 2.4
Total other current liabilities 14.3 12.3
Other non-current liabilities    
Contingent liabilities 1.0 0.9
Operating lease liability 9.5 11.7
Other non-current liabilities 0.1 0.2
Total other non-current liabilities 10.6 12.8
Land, buildings and leasehold improvements    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 70.3 68.1
Machinery and equipment    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 285.5 287.7
Construction in progress    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment $ 6.9 $ 8.9