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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounts and other receivables    
Trade receivables $ 55.6 $ 49.8
Related parties 1.1 0.9
Prepayments and accrued income 7.4 7.7
Derivative financial instruments 0.2 0.1
Other receivables 3.6 4.2
Total accounts and other receivables 67.9 62.7
Inventories    
Raw materials and supplies 32.6 30.5
Work-in-process 36.2 33.1
Finished goods 29.9 30.0
Total inventories 98.7 93.6
Other current assets    
Held-for-sale assets 4.1 10.7
Other current assets 1.6 0.0
Total other current assets 5.7 10.7
Property, Plant and Equipment [Abstract]    
Total property plant and equipment 351.7 369.4
Accumulated depreciation and impairment (249.4) (262.5)
Total property, plant and equipment, net 102.3 106.9
Current maturities of long-term debt and short-term borrowings    
Overdrafts 7.2 3.5
Total current maturities of long-term debt and short-term borrowings 7.2 3.5
Other current liabilities    
Contingent liabilities 8.0 5.3
Held-for-sale liabilities 0.0 2.5
Derivative financial instruments 0.3 0.0
Operating lease liability 3.5 3.5
Other current liabilities 2.2 4.1
Total other current liabilities 14.0 15.4
Other non-current liabilities    
Contingent liabilities 1.1 0.8
Operating lease liability 12.9 14.9
Other non-current liabilities 0.4 0.5
Total other non-current liabilities 14.4 16.2
Land, buildings and leasehold improvements    
Property, Plant and Equipment [Abstract]    
Total property plant and equipment 66.1 73.3
Machinery and equipment    
Property, Plant and Equipment [Abstract]    
Total property plant and equipment 270.7 286.0
Construction in progress    
Property, Plant and Equipment [Abstract]    
Total property plant and equipment $ 14.9 $ 10.1