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Segment reporting - Consolidated statements of financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets [abstract]        
Goodwill $ 202,848 $ 205,287 $ 230,210  
Other intangible assets 51,822 58,658 62,839  
Property, plant and equipment 888,862 917,974 781,606  
Inventories 456,970 361,231    
Trade and other receivables 172,510 118,435    
Cash and cash equivalents 216,647 184,472 196,931  
Other 134,158 154,200    
Total assets 2,123,817 2,000,257    
Equity and liabilities [abstract]        
Equity 884,372 937,758 892,042 $ 1,294,973
Provisions 116,357 115,492 $ 101,584  
Bank borrowings 141,012 1,003    
Obligations under finance leases 66,471 82,633    
Debt instruments 352,594 350,270    
Other financial liabilities 85,312 137,431    
Trade and other payables 267,951 205,832    
Other 209,748 169,838    
Total equity and liabilities 2,123,817 2,000,257    
Eliminations        
Assets [abstract]        
Trade and other receivables (1,254,935) (1,175,756)    
Other   (45,212)    
Total assets (1,254,935) (1,220,968)    
Equity and liabilities [abstract]        
Trade and other payables (1,282,176) (1,176,336)    
Other 27,241 (44,632)    
Total equity and liabilities (1,254,935) (1,220,968)    
Electrometallurgy - North America        
Assets [abstract]        
Goodwill 202,848 205,287    
Other intangible assets 22,798 26,724    
Property, plant and equipment 467,616 512,003    
Inventories 113,673 100,856    
Trade and other receivables 267,974 165,006    
Cash and cash equivalents 76,791 10,886    
Other 15,341 36,554    
Total assets 1,167,041 1,057,316    
Equity and liabilities [abstract]        
Equity 646,851 521,819    
Provisions 29,644 28,602    
Obligations under finance leases 1,466 1,994    
Trade and other payables 414,022 321,710    
Other 75,058 183,191    
Total equity and liabilities 1,167,041 1,057,316    
Electrometallurgy - Europe        
Assets [abstract]        
Other intangible assets 26,476 20,381    
Property, plant and equipment 219,520 167,314    
Inventories 288,669 204,240    
Trade and other receivables 274,291 260,612    
Cash and cash equivalents 110,523 153,967    
Other 85,905 92,322    
Total assets 1,005,384 898,836    
Equity and liabilities [abstract]        
Equity 206,781 198,059    
Provisions 71,163 56,654    
Bank borrowings 6,914      
Other financial liabilities 3,841 4,918    
Trade and other payables 662,667 584,542    
Other 54,018 54,663    
Total equity and liabilities 1,005,384 898,836    
Electrometallurgy - South Africa        
Assets [abstract]        
Other intangible assets 1,292 1,505    
Property, plant and equipment 56,679 64,331    
Inventories 35,944 42,478    
Trade and other receivables 50,665 35,330    
Cash and cash equivalents 19,483 6,912    
Other 8,692 41,008    
Total assets 172,755 191,564    
Equity and liabilities [abstract]        
Equity 58,294 62,933    
Provisions 7,889 11,080    
Trade and other payables 93,970 95,082    
Other 12,602 22,469    
Total equity and liabilities 172,755 191,564    
Other segments        
Assets [abstract]        
Other intangible assets 1,256 10,048    
Property, plant and equipment 145,047 174,326    
Inventories 18,684 13,657    
Trade and other receivables 834,515 833,243    
Cash and cash equivalents 9,850 12,707    
Other 24,220 29,528    
Total assets 1,033,572 1,073,509    
Equity and liabilities [abstract]        
Equity (27,554) 154,947    
Provisions 7,661 19,156    
Bank borrowings 134,098 1,003    
Obligations under finance leases 65,005 80,639    
Debt instruments 352,594 350,270    
Other financial liabilities 81,471 132,513    
Trade and other payables 379,468 380,834    
Other 40,829 (45,853)    
Total equity and liabilities $ 1,033,572 $ 1,073,509