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Condensed Consolidating Financial Information - Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
NET SALES:                      
Related parties                 $ 1,025.5 $ 1,191.6 $ 1,204.5
Other customers                 579.6 645.0 688.7
Total net sales                 1,605.1 1,836.6 1,893.2
Cost of goods sold                 1,641.6 1,860.5 1,916.1
Gross profit (loss) $ (1.2) $ (27.1) $ (13.0) $ 4.8 $ 6.7 $ (13.7) $ (4.1) $ (12.8) (36.5) (23.9) (22.9)
Selling, general and administrative expenses                 43.5 47.4 40.2
Helguvik impairment                 0.0 0.0 (4.5)
Other operating expense - net                 0.5 0.8 0.4
Operating income (loss)                 (80.5) (72.1) (59.0)
Interest expense – Hawesville term loan                 (1.9) (2.1) 0.0
Interest expense                 (29.7) (23.0) (22.4)
Intercompany Interest                 0.0 0.0  
Interest income                 0.8 0.8 1.5
Net gain (loss) on forward and derivative contracts                 (17.3) 12.0 6.3
Loss on early extinguishment of debt                 (1.2) 0.0 0.0
Other income (expense) - net                 3.5 (1.1) 3.0
Income (loss) before income taxes and equity in earnings of joint ventures                 (126.3) (85.5) (70.6)
Income tax (expense) benefit                 3.1 8.4 0.2
Income (loss) before equity in earnings of joint ventures                 (123.2) (77.1) (70.4)
BBH impairment                 0.0 (4.3) 0.0
Equity in earnings of joint ventures                 (0.1) 0.6 4.2
Net income (loss) $ (35.5) $ (58.2) $ (26.9) $ (2.7) $ (4.8) $ (20.7) $ (20.7) $ (34.6) (123.3) (80.8) (66.2)
Other comprehensive income (loss) before income tax effect                 (7.9) (8.8) (5.5)
Income tax effect                 (1.0) (1.0) (1.5)
Other comprehensive income                 (8.9) (9.8) (7.0)
Total comprehensive income (loss)                 $ (132.2) (90.6) (73.2)
Combined Guarantor Subsidiaries [Member] | Century Aluminum [Member]                      
Condensed Statement of Income Captions [Line Items]                      
Ownership percentage 100.00%               100.00%    
Reportable Legal Entities [Member] | The Company [Member]                      
NET SALES:                      
Related parties                 $ 0.0 0.0 0.0
Other customers                 0.0 0.0 0.0
Total net sales                 0.0 0.0 0.0
Cost of goods sold                 0.0 0.0 0.0
Gross profit (loss)                 0.0 0.0 0.0
Selling, general and administrative expenses                 27.2 25.9 23.3
Helguvik impairment                     0.0
Other operating expense - net                 0.0 0.0 0.0
Operating income (loss)                 (27.2) (25.9) (23.3)
Interest expense – Hawesville term loan                 (1.9) (2.1) 36.3
Interest expense                 (26.8) (21.0) (20.6)
Intercompany Interest                 32.8 35.0  
Interest income                 0.4 0.2 0.3
Net gain (loss) on forward and derivative contracts                 10.6 12.0 1.3
Loss on early extinguishment of debt                 (1.2)    
Other income (expense) - net                 (0.1) 1.3 2.1
Income (loss) before income taxes and equity in earnings of joint ventures                 (13.4) (0.5) (3.9)
Income tax (expense) benefit                 1.2 1.2 2.6
Income (loss) before equity in earnings of joint ventures                 (12.2) 0.7 (1.3)
BBH impairment                 0.0 0.0  
Equity in earnings of joint ventures                 (111.1) (81.5) (64.9)
Net income (loss)                 (123.3) (80.8) (66.2)
Other comprehensive income (loss) before income tax effect                 (7.9) (8.8) (5.5)
Income tax effect                 (1.0) (1.0) (1.5)
Other comprehensive income                 (8.9) (9.8) (7.0)
Total comprehensive income (loss)                 (132.2) (90.6) (73.2)
Reportable Legal Entities [Member] | Combined Guarantor Subsidiaries [Member]                      
NET SALES:                      
Related parties                 531.1 566.5 453.6
Other customers                 476.4 613.1 685.0
Total net sales                 1,007.5 1,179.6 1,138.6
Cost of goods sold                 1,072.5 1,182.4 1,169.2
Gross profit (loss)                 (65.0) (2.8) (30.6)
Selling, general and administrative expenses                 11.9 16.3 11.6
Helguvik impairment                     0.0
Other operating expense - net                 0.0 0.0 0.0
Operating income (loss)                 (76.9) (19.1) (42.2)
Interest expense – Hawesville term loan                 0.0 0.0 9.5
Interest expense                 (1.5) (1.7) (1.6)
Intercompany Interest                 11.1 10.3  
Interest income                 0.0 0.0 0.0
Net gain (loss) on forward and derivative contracts                 1.4 1.4 1.4
Loss on early extinguishment of debt                 0.0    
Other income (expense) - net                 1.0 (2.8) (1.9)
Income (loss) before income taxes and equity in earnings of joint ventures                 (64.9) (11.9) (34.8)
Income tax (expense) benefit                 0.0 1.4 0.0
Income (loss) before equity in earnings of joint ventures                 (64.9) (10.5) (34.8)
BBH impairment                 0.0 0.0  
Equity in earnings of joint ventures                 2.6 8.2 0.6
Net income (loss)                 (62.3) (2.3) (34.2)
Other comprehensive income (loss) before income tax effect                 (4.7) (3.2) (24.2)
Income tax effect                 0.0 0.0 0.0
Other comprehensive income                 (4.7) (3.2) (24.2)
Total comprehensive income (loss)                 (67.0) (5.5) (58.4)
Reportable Legal Entities [Member] | Combined Non-Guarantor Subsidiaries [Member]                      
NET SALES:                      
Related parties                 494.4 625.1 750.9
Other customers                 103.2 31.9 3.7
Total net sales                 597.6 657.0 754.6
Cost of goods sold                 569.1 678.1 746.9
Gross profit (loss)                 28.5 (21.1) 7.7
Selling, general and administrative expenses                 4.4 5.2 5.3
Helguvik impairment                     (4.5)
Other operating expense - net                 0.5 0.8 0.4
Operating income (loss)                 23.6 (27.1) 6.5
Interest expense – Hawesville term loan                 0.0 0.0 (45.8)
Interest expense                 (1.4) (0.3) (0.2)
Intercompany Interest                 (43.9) (45.3)  
Interest income                 0.4 0.6 1.2
Net gain (loss) on forward and derivative contracts                 (29.3) (1.4) 3.6
Loss on early extinguishment of debt                 0.0    
Other income (expense) - net                 2.6 0.4 2.8
Income (loss) before income taxes and equity in earnings of joint ventures                 (48.0) (73.1) (31.9)
Income tax (expense) benefit                 1.9 5.8 (2.4)
Income (loss) before equity in earnings of joint ventures                 (46.1) (67.3) (34.3)
BBH impairment                 0.0 (4.3)  
Equity in earnings of joint ventures                 (0.1) 0.6 4.2
Net income (loss)                 (46.2) (71.0) (30.1)
Other comprehensive income (loss) before income tax effect                 (1.3) (1.2) 5.2
Income tax effect                 0.0 0.0 0.0
Other comprehensive income                 (1.3) (1.2) 5.2
Total comprehensive income (loss)                 (47.5) (72.2) (24.9)
Consolidating Adjustments [Member]                      
NET SALES:                      
Related parties                 0.0 0.0 0.0
Other customers                 0.0 0.0 0.0
Total net sales                 0.0 0.0 0.0
Cost of goods sold                 0.0 0.0 0.0
Gross profit (loss)                 0.0 0.0 0.0
Selling, general and administrative expenses                 0.0 0.0 0.0
Helguvik impairment                     0.0
Other operating expense - net                 0.0 0.0
Operating income (loss)                 0.0 0.0 0.0
Interest expense – Hawesville term loan                 0.0 0.0 0.0
Interest expense                 0.0 0.0 0.0
Intercompany Interest                 0.0 0.0  
Interest income                 0.0 0.0 0.0
Net gain (loss) on forward and derivative contracts                 0.0 0.0 0.0
Loss on early extinguishment of debt                 0.0    
Other income (expense) - net                 0.0 0.0 0.0
Income (loss) before income taxes and equity in earnings of joint ventures                 0.0 0.0 0.0
Income tax (expense) benefit                 0.0 0.0 0.0
Income (loss) before equity in earnings of joint ventures                 0.0 0.0 0.0
BBH impairment                 0.0 0.0  
Equity in earnings of joint ventures                 108.5 73.3 64.3
Net income (loss)                 108.5 73.3 64.3
Other comprehensive income (loss) before income tax effect                 6.0 4.4 19.0
Income tax effect                 (0.0) 0.0 0.0
Other comprehensive income                 6.0 4.4 19.0
Total comprehensive income (loss)                 $ 114.5 $ 77.7 $ 83.3