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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accounts and other receivables    
Trade receivables $ 60.2 $ 49.8
Related parties 1.4 0.9
Prepayments and accrued income 7.9 7.7
Derivative financial instruments 0.3 0.1
Other receivables 3.9 4.2
Total accounts and other receivables 73.7 62.7
Inventories    
Raw materials and supplies 30.0 30.5
Work-in-process 38.9 33.1
Finished goods 29.0 30.0
Total inventories 97.9 93.6
Other current assets    
Held-for-sale assets 10.4 10.7
Total other current assets 10.4 10.7
Property, Plant and Equipment [Abstract]    
Total property plant and equipment 373.7 369.4
Accumulated depreciation and impairment (265.9) (262.5)
Total property, plant and equipment, net 107.8 106.9
Current maturities of long-term debt and short-term borrowings    
Overdrafts 7.6 3.5
Total current maturities of long-term debt and short-term borrowings 7.6 3.5
Other current liabilities    
Contingent liabilities 12.3 5.3
Held-for-sale liabilities 2.1 2.5
Derivative financial instruments 0.2 0.0
Operating lease liability 3.5 3.5
Other current liabilities 2.6 4.1
Total other current liabilities 20.7 15.4
Other non-current liabilities    
Contingent liabilities 1.0 0.8
Operating lease liability 14.2 14.9
Other non-current liabilities 0.6 0.5
Total other non-current liabilities 15.8 16.2
Land, buildings and leasehold improvements    
Property, Plant and Equipment [Abstract]    
Total property plant and equipment 73.2 73.3
Machinery and equipment    
Property, Plant and Equipment [Abstract]    
Total property plant and equipment 287.8 286.0
Construction in progress    
Property, Plant and Equipment [Abstract]    
Total property plant and equipment $ 12.7 $ 10.1