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Segment reporting - Consolidated income statements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Profit (loss) [abstract]      
Sales $ 1,615,222 $ 2,242,002 [1] $ 1,732,276 [1]
Cost of sales (1,214,397) (1,446,677) [1] (1,043,275) [1]
Other operating income 54,213 45,844 [1] 18,100 [1]
Staff costs (285,029) (338,862) [1] (300,035) [1]
Other operating expense (225,705) (277,560) [1] (234,399) [1]
Depreciation and amortization charges, operating allowances and write-downs (120,194) (113,837) [1] (100,402) [1]
Impairment losses (175,899) (58,919) [1] (31,641) [1]
Net (loss) gain due to changes in the value of assets (1,574) (7,623) [1] 7,504 [1]
(Loss) gain on disposal of non-current assets (2,223) 14,564 [1] (4,316) [1]
Bargain purchase gain [1]   40,142  
Other (loss) gain [1]     (2,613)
Operating (loss) profit (355,586) 99,074 [1] 41,199 [1]
Finance income 1,380 4,858 [1] 2,409 [1]
Finance costs (63,225) (57,066) [1] (59,969) [1]
Financial derivative gain (loss) 2,729 2,838 [1] (6,850) [1]
Exchange differences 2,884 (14,136) [1] 8,214 [1]
(Loss) profit before tax (411,818) 35,568 [1] (14,997) [1]
Income tax benefit (expense) 41,541 (20,459) [1] 14,225 [1]
(Loss) profit from continuing operations (370,277) 15,109 [1] (772) [1]
(Loss) profit from discontinued operations 84,637 9,464 [1] (5,050) [1]
(Loss) profit for the year (285,640) 24,573 [1] (5,822) [1]
Loss (profit) attributable to non-controlling interests 5,039 19,088 [1] 5,144 [1]
(Loss) profit attributable to the Parent (280,601) 43,661 [1] (678) [1]
Adjustments/Eliminations      
Profit (loss) [abstract]      
Sales (165,293) (187,305) (65,353)
Cost of sales 165,714 187,212 65,650
Other operating income (24,613) (19,002) (15,670)
Staff costs     (220)
Other operating expense 24,192 19,095 16,158
Depreciation and amortization charges, operating allowances and write-downs     9
Impairment losses     (16)
Net (loss) gain due to changes in the value of assets     282
(Loss) gain on disposal of non-current assets     57
Other (loss) gain     13,616
Operating (loss) profit     14,513
Finance income (23,008) (39,220) (195,138)
Finance costs 23,008 39,220 35,108
Exchange differences     (66)
(Loss) profit before tax     (145,583)
Income tax benefit (expense)     (294)
(Loss) profit from continuing operations     (145,877)
(Loss) profit for the year     (145,877)
Loss (profit) attributable to non-controlling interests     (24)
(Loss) profit attributable to the Parent     (145,901)
Electrometallurgy - North America | Operating segments      
Profit (loss) [abstract]      
Sales 551,500 710,716 541,143
Cost of sales (366,711) (394,044) (303,096)
Other operating income 10,418 4,943 2,701
Staff costs (87,954) (115,555) (90,802)
Other operating expense (60,105) (77,670) (68,537)
Depreciation and amortization charges, operating allowances and write-downs (72,251) (69,009) (66,789)
Impairment losses (174,013)   (30,618)
(Loss) gain on disposal of non-current assets (1,601) (208) (3,718)
Operating (loss) profit (200,717) 59,173 (19,716)
Finance income 529 804 448
Finance costs (3,914) (4,109) (4,567)
Exchange differences (407) (1,194) (191)
(Loss) profit before tax (204,509) 54,674 (24,026)
Income tax benefit (expense) 8,520 4,949 29,386
(Loss) profit from continuing operations (195,989) 59,623 5,360
(Loss) profit for the year (195,989) 59,623 5,360
Loss (profit) attributable to non-controlling interests 5,123 4,785 4,734
(Loss) profit attributable to the Parent (190,866) 64,408 10,094
Electrometallurgy - Europe | Operating segments      
Profit (loss) [abstract]      
Sales 1,049,576 1,447,973 1,083,200
Cost of sales (868,654) (1,059,474) (690,589)
Other operating income 47,672 39,817 12,681
Staff costs (145,712) (177,047) (147,595)
Other operating expense (142,929) (146,143) (107,130)
Depreciation and amortization charges, operating allowances and write-downs (39,844) (34,974) (27,404)
Impairment losses (465)    
Net (loss) gain due to changes in the value of assets   (7)  
(Loss) gain on disposal of non-current assets 180 (8,369) 301
Bargain purchase gain   40,142  
Other (loss) gain     (13,604)
Operating (loss) profit (100,176) 101,918 109,860
Finance income 9,220 11,035 6,733
Finance costs (22,547) (40,831) (40,106)
Exchange differences 3,139 (10,561) 5,938
(Loss) profit before tax (110,364) 61,561 82,425
Income tax benefit (expense) 22,470 (15,048) (26,031)
(Loss) profit from continuing operations (87,894) 46,513 56,394
(Loss) profit from discontinued operations 3,280    
(Loss) profit for the year (84,614) 46,513 56,394
Loss (profit) attributable to non-controlling interests   (332) (370)
(Loss) profit attributable to the Parent (84,614) 46,181 56,024
Electrometallurgy - South Africa | Operating segments      
Profit (loss) [abstract]      
Sales 136,292 208,543 122,504
Cost of sales (108,823) (137,177) (81,744)
Other operating income 1,323 3,420 2,868
Staff costs (20,333) (23,735) (23,495)
Other operating expense (19,457) (26,353) (24,462)
Depreciation and amortization charges, operating allowances and write-downs (6,459) (5,526) (5,788)
Net (loss) gain due to changes in the value of assets (530) (7,616) 7,222
(Loss) gain on disposal of non-current assets   (261) (138)
Operating (loss) profit (17,987) 11,295 (3,033)
Finance income 156 199 404
Finance costs (4,507) (5,298) (7,361)
Exchange differences (1,179) 2,284 (1,197)
(Loss) profit before tax (23,517) 8,480 (11,187)
Income tax benefit (expense) 7,761 (3,582) 2,068
(Loss) profit from continuing operations (15,756) 4,898 (9,119)
(Loss) profit for the year (15,756) 4,898 (9,119)
Loss (profit) attributable to non-controlling interests (368) 358 (147)
(Loss) profit attributable to the Parent (16,124) 5,256 (9,266)
Other segments | Operating segments      
Profit (loss) [abstract]      
Sales 43,147 62,075 50,782
Cost of sales (35,923) (43,194) (33,496)
Other operating income 19,413 16,666 15,520
Staff costs (31,030) (22,525) (37,923)
Other operating expense (27,406) (46,489) (50,428)
Depreciation and amortization charges, operating allowances and write-downs (1,640) (4,328) (430)
Impairment losses (1,421) (58,919) (1,007)
Net (loss) gain due to changes in the value of assets (1,044)    
(Loss) gain on disposal of non-current assets (802) 23,402 (818)
Other (loss) gain     (2,625)
Operating (loss) profit (36,706) (73,312) (60,425)
Finance income 14,483 32,040 189,962
Finance costs (55,265) (46,048) (43,043)
Financial derivative gain (loss) 2,729 2,838 (6,850)
Exchange differences 1,331 (4,665) 3,730
(Loss) profit before tax (73,428) (89,147) 83,374
Income tax benefit (expense) 2,790 (6,778) 9,096
(Loss) profit from continuing operations (70,638) (95,925) 92,470
(Loss) profit from discontinued operations 81,357 9,464 (5,050)
(Loss) profit for the year 10,719 (86,461) 87,420
Loss (profit) attributable to non-controlling interests 284 14,277 951
(Loss) profit attributable to the Parent $ 11,003 $ (72,184) $ 88,371
[1] The amounts for prior periods have been restated to reclassify the results of the Company´s Spanish hydroelectric assets within profit (loss) from discontinued operations.