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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts and other receivables      
Trade receivables, net $ 45.8 $ 33.6  
Related parties 0.1 0.2  
Prepayments and accrued income 8.5 5.5  
Derivative financial instruments 0.1 0.2  
Deferred consideration 1.0 0.2  
Other receivables 2.3 3.4  
Total accounts and other receivables 57.8 43.1  
Inventories      
Raw materials and supplies 39.3 26.2  
Work-in-process 26.7 19.7  
Finished goods 24.5 22.9  
Total inventories 90.5 68.8  
Other current assets      
Income tax receivable 0.0 1.5  
Total other current assets 0.0 1.5  
Property, Plant and Equipment [Abstract]      
Total property plant and equipment 339.3 328.3  
Accumulated depreciation and impairment (251.8) (242.3)  
Total property, plant and equipment, net 87.5 86.0  
Other current liabilities      
Short term provision 0.2 1.1  
Restructuring provision 11.7 9.0 $ 6.5
Derivative financial instruments 0.1 0.4  
Operating lease liability 3.0 2.9  
Advance payments 4.6 0.1  
Total other current liabilities 19.6 13.5  
Other non-current liabilities      
Contingent liabilities 1.8 1.0  
Operating lease liability 9.8 6.7  
Total other non-current liabilities $ 11.6 $ 7.7  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Total other current liabilities Total other current liabilities  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Total other non-current liabilities Total other non-current liabilities  
Land, buildings and leasehold improvements      
Property, Plant and Equipment [Abstract]      
Total property plant and equipment $ 64.6 $ 65.2  
Machinery and equipment      
Property, Plant and Equipment [Abstract]      
Total property plant and equipment 266.3 255.3  
Construction in progress      
Property, Plant and Equipment [Abstract]      
Total property plant and equipment $ 8.4 $ 7.8