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Supplementary balance sheet information - Schedule of Condensed Balance Sheet (Details) - USD ($)
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts and other receivables        
Trade receivables $ 52,400,000   $ 49,800,000  
Related parties 2,700,000   900,000  
Prepayments and accrued income 6,700,000   7,700,000  
Derivative financial instruments 300,000   100,000  
Other receivables 4,200,000   4,200,000  
Total accounts and other receivables 66,300,000   62,700,000  
Inventories        
Raw materials and supplies 33,400,000   30,500,000  
Work-in-process 32,200,000   33,100,000  
Finished goods 28,900,000   30,000,000.0  
Total inventories 94,500,000   93,600,000  
Other current assets        
Held-for-sale assets 3,900,000   10,700,000  
Income tax receivable 1,100,000   0  
Total other current assets 5,000,000.0   10,700,000  
Property, Plant and Equipment [Abstract]        
Total property plant and equipment 364,700,000   369,400,000  
Accumulated depreciation and impairment (265,800,000)   (262,500,000)  
Total property, plant and equipment, net 98,900,000   106,900,000 $ 129,100,000
Current maturities of long-term debt and short-term borrowings        
Overdrafts 0   3,500,000  
Total current maturities of long-term debt and short-term borrowings 0   3,500,000  
Other current liabilities        
Contingent liabilities 6,600,000   5,300,000  
Held-for-sale liabilities 0   2,500,000  
Operating lease liability 3,300,000 $ 3,100,000 3,500,000  
Other current liabilities 2,400,000   4,100,000  
Total other current liabilities 12,300,000   15,400,000  
Other non-current liabilities        
Contingent liabilities 900,000   800,000  
Operating lease liability 11,700,000 $ 18,100,000 14,900,000  
Other non-current liabilities 200,000   500,000  
Total other non-current liabilities 12,800,000   16,200,000  
Land, buildings and leasehold improvements        
Property, Plant and Equipment [Abstract]        
Total property plant and equipment 68,100,000   73,300,000  
Machinery and equipment        
Property, Plant and Equipment [Abstract]        
Total property plant and equipment 287,700,000   286,000,000.0  
Construction in progress        
Property, Plant and Equipment [Abstract]        
Total property plant and equipment $ 8,900,000   $ 10,100,000