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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 29, 2020
Dec. 31, 2019
Accounts and other receivables    
Trade receivables $ 62.2 $ 52.4
Related parties 2.6 2.7
Prepayments and accrued income 4.9 6.7
Derivative financial instruments 0.4 0.3
Other receivables 3.5 4.2
Total accounts and other receivables 73.6 66.3
Inventories    
Raw materials and supplies 34.0 33.4
Work-in-process 33.7 32.2
Finished goods 26.2 28.9
Total inventories 93.9 94.5
Other current assets    
Held-for-sale assets 3.8 3.9
Income tax receivable 0.3 1.1
Total other current assets 4.1 5.0
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 353.6 364.7
Accumulated depreciation and impairment (259.3) (265.8)
Total property, plant and equipment, net 94.3 98.9
Other current liabilities    
Contingent liabilities 7.0 6.6
Derivative financial instruments 0.6 0.0
Operating lease liability 3.1 3.3
Other current liabilities 1.5 2.4
Total other current liabilities 12.2 12.3
Other non-current liabilities    
Contingent liabilities 0.9 0.9
Operating lease liability 10.6 11.7
Other non-current liabilities 0.2 0.2
Total other non-current liabilities 11.7 12.8
Land, buildings and leasehold improvements    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 68.4 68.1
Machinery and equipment    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment 278.2 287.7
Construction in progress    
Property, Plant and Equipment [Abstract]    
Total property, plant and equipment $ 7.0 $ 8.9