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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

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