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Condensed Consolidating Financial Information - Statement of Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
NET SALES        
Related parties $ 282.3 $ 305.3 $ 898.7 $ 884.2
Other customers 155.7 176.5 502.5 522.1
Total net sales 438.0 481.8 1,401.2 1,406.3
Cost of goods sold 451.7 493.6 1,431.8 1,369.9
Gross profit (loss) (13.7) (11.8) (30.6) 36.4
Selling, general and administrative expenses 11.6 8.8 38.2 31.5
Helguvik (gains) 0.0 (4.5) 0.0 (4.5)
Other operating expense, net (0.1) (0.5) 0.4 (0.0)
Operating income (loss) (25.2) (15.6) (69.2) 9.4
Interest expense - term loan (0.8) 0.0 (1.3) 0.0
Interest expense (5.6) (5.6) (17.3) (16.7)
Intercompany interest 0.0 0.0 0.0 0.0
Interest income 0.2 0.4 0.6 1.3
Net gain (loss) on forward and derivative contracts 10.3 0.8 10.7 2.8
Other income (expense) - net (0.9) 0.7 (1.6) 1.8
Income (loss) before income taxes and equity in earnings of joint ventures (22.0) (19.3) (78.1) (1.4)
Income tax benefit (expense) 1.3 (1.7) 5.7 (3.0)
Income (loss) before equity in earnings of joint ventures (20.7) (21.0) (72.4) (4.4)
Loss on sale of BHH 0.0 0.0 (4.3) 0.0
Equity in earnings of joint ventures 0.0 0.7 0.7 3.2
Net income (loss) (20.7) (20.3) (76.0) (1.2)
Other comprehensive income before income tax effect 1.0 0.5 2.8 4.2
Income tax effect (0.3) (0.4) (0.8) (1.1)
Other comprehensive income 0.7 0.1 2.0 3.1
Total comprehensive income (loss) (20.0) (20.2) (74.0) 1.9
Consolidating Adjustments [Member]        
NET SALES        
Related parties 0.0 0.0 0.0 0.0
Other customers 0.0 0.0 0.0 0.0
Total net sales 0.0 0.0 0.0 0.0
Cost of goods sold 0.0 0.0 0.0 0.0
Gross profit (loss) 0.0 0.0 0.0 0.0
Selling, general and administrative expenses 0.0 0.0 0.0 0.0
Helguvik (gains)   0.0   0.0
Other operating expense, net 0.0 0.0 0.0 0.0
Operating income (loss) 0.0 0.0 0.0 0.0
Interest expense - term loan 0.0   0.0  
Interest expense 0.0 0.0 0.0 0.0
Intercompany interest 0.0 0.0 0.0 0.0
Interest income 0.0 0.0 0.0 0.0
Net gain (loss) on forward and derivative contracts 0.0 0.0 0.0 0.0
Other income (expense) - net 0.0 0.0 0.0 0.0
Income (loss) before income taxes and equity in earnings of joint ventures 0.0 0.0 0.0 0.0
Income tax benefit (expense) 0.0 0.0 0.0 0.0
Income (loss) before equity in earnings of joint ventures 0.0 0.0 0.0 0.0
Loss on sale of BHH     0.0  
Equity in earnings of joint ventures 20.1 13.8 58.0 (14.9)
Net income (loss) 20.1 13.8 58.0 (14.9)
Other comprehensive income before income tax effect (1.3) (0.9) (3.6) (5.1)
Income tax effect 0.0 0.0 0.0 0.0
Other comprehensive income (1.3) (0.9) (3.6) (5.1)
Total comprehensive income (loss) 18.8 12.9 54.4 (20.0)
The Company [Member] | Reportable Legal Entities [Member]        
NET SALES        
Related parties 0.0 0.0 0.0 0.0
Other customers 0.0 0.0 0.0 0.0
Total net sales 0.0 0.0 0.0 0.0
Cost of goods sold 0.0 0.0 0.0 0.0
Gross profit (loss) 0.0 0.0 0.0 0.0
Selling, general and administrative expenses 11.3 8.4 36.9 29.8
Helguvik (gains)   0.0   0.0
Other operating expense, net 0.0 0.0 0.0 0.0
Operating income (loss) (11.3) (8.4) (36.9) (29.8)
Interest expense - term loan (0.8)   (1.3)  
Interest expense (5.1) (5.0) (15.9) (15.4)
Intercompany interest 8.8 9.3 26.2 27.4
Interest income 0.1 0.1 0.2 0.3
Net gain (loss) on forward and derivative contracts 10.2 (0.2) 10.3 (0.2)
Other income (expense) - net 0.1 0.0 0.9 0.6
Income (loss) before income taxes and equity in earnings of joint ventures 2.0 (4.2) (16.5) (17.1)
Income tax benefit (expense) 0.7 0.5 1.6 0.7
Income (loss) before equity in earnings of joint ventures 2.7 (3.7) (14.9) (16.4)
Loss on sale of BHH     0.0  
Equity in earnings of joint ventures (23.4) (16.6) (61.1) 15.2
Net income (loss) (20.7) (20.3) (76.0) (1.2)
Other comprehensive income before income tax effect 1.0 0.5 2.8 4.2
Income tax effect (0.3) (0.4) (0.8) (1.1)
Other comprehensive income 0.7 0.1 2.0 3.1
Total comprehensive income (loss) (20.0) (20.2) (74.0) 1.9
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
NET SALES        
Related parties 132.9 110.8 432.8 315.1
Other customers 144.2 175.8 479.1 519.1
Total net sales 277.1 286.6 911.9 834.2
Cost of goods sold 288.3 301.5 921.5 821.1
Gross profit (loss) (11.2) (14.9) (9.6) 13.1
Selling, general and administrative expenses 0.0 0.0 0.0 0.0
Helguvik (gains)   0.0   0.0
Other operating expense, net 0.0 0.0 0.0 0.0
Operating income (loss) (11.2) (14.9) (9.6) 13.1
Interest expense - term loan 0.0   0.0  
Interest expense (0.4) (0.4) (1.2) (1.2)
Intercompany interest 2.6 2.4 7.6 7.0
Interest income 0.0 0.0 0.0 0.0
Net gain (loss) on forward and derivative contracts 0.3 0.4 1.0 1.1
Other income (expense) - net (0.1) 0.0 (2.0) (0.2)
Income (loss) before income taxes and equity in earnings of joint ventures (8.8) (12.5) (4.2) 19.8
Income tax benefit (expense) 0.0 0.0 0.0 0.0
Income (loss) before equity in earnings of joint ventures (8.8) (12.5) (4.2) 19.8
Loss on sale of BHH     0.0  
Equity in earnings of joint ventures 3.4 2.8 3.1 (0.3)
Net income (loss) (5.4) (9.7) (1.1) 19.5
Other comprehensive income before income tax effect 0.8 0.5 1.6 3.9
Income tax effect 0.0 0.0 0.0 0.0
Other comprehensive income 0.8 0.5 1.6 3.9
Total comprehensive income (loss) (4.6) (9.2) 0.5 23.4
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
NET SALES        
Related parties 149.4 194.5 465.9 569.1
Other customers 11.5 0.7 23.4 3.0
Total net sales 160.9 195.2 489.3 572.1
Cost of goods sold 163.4 192.1 510.3 548.8
Gross profit (loss) (2.5) 3.1 (21.0) 23.3
Selling, general and administrative expenses 0.3 0.4 1.3 1.7
Helguvik (gains)   (4.5)   (4.5)
Other operating expense, net (0.1) (0.5) 0.4 (0.0)
Operating income (loss) (2.7) 7.7 (22.7) 26.1
Interest expense - term loan 0.0   0.0  
Interest expense (0.1) (0.2) (0.2) (0.1)
Intercompany interest (11.4) (11.7) (33.8) (34.4)
Interest income 0.1 0.3 0.4 1.0
Net gain (loss) on forward and derivative contracts (0.2) 0.6 (0.6) 1.9
Other income (expense) - net (0.9) 0.7 (0.5) 1.4
Income (loss) before income taxes and equity in earnings of joint ventures (15.2) (2.6) (57.4) (4.1)
Income tax benefit (expense) 0.6 (2.2) 4.1 (3.7)
Income (loss) before equity in earnings of joint ventures (14.6) (4.8) (53.3) (7.8)
Loss on sale of BHH     (4.3)  
Equity in earnings of joint ventures (0.1) 0.7 0.7 3.2
Net income (loss) (14.7) (4.1) (56.9) (4.6)
Other comprehensive income before income tax effect 0.5 0.4 2.0 1.2
Income tax effect 0.0 0.0 0.0 0.0
Other comprehensive income 0.5 0.4 2.0 1.2
Total comprehensive income (loss) $ (14.2) $ (3.7) $ (54.9) $ (3.4)
Century Aluminum [Member] | Combined Guarantor Subsidiaries [Member]        
Condensed Statement of Income Captions [Line Items]        
Ownership percentage 100.00%   100.00%