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Condensed Consolidating Financial Information - Statement of Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
NET SALES    
Related parties $ 271.0 $ 311.3
Other customers 150.2 178.7
Total net sales 421.2 490.0
Cost of goods sold 416.4 502.8
Gross profit (loss) 4.8 (12.8)
Selling, general and administrative expenses 8.9 14.7
Other operating (income) expense - net 0.3 0.3
Operating income (loss) (4.4) (27.8)
Interest expense - term loan (0.7) 0.0
Interest expense (6.0) (5.8)
Intercompany interest 0.0 0.0
Interest income 0.1 0.2
Net gain (loss) on forward and derivative contracts 3.8 (5.7)
Other income (expense) - net 1.7 1.1
Income (loss) before income taxes and equity in earnings of joint ventures (5.5) (38.0)
Income tax benefit (expense) 2.8 2.9
Income (loss) before equity in earnings of joint ventures (2.7) (35.1)
Equity in earnings of joint ventures 0.0 0.5
Net income (loss) (2.7) (34.6)
Other comprehensive income before income tax effect 1.7 0.6
Income tax effect (0.3) (0.3)
Other comprehensive income (loss) 1.4 0.3
Total comprehensive income (loss) (1.3) (34.3)
Consolidating Adjustments [Member]    
NET SALES    
Related parties 0.0 0.0
Other customers 0.0 0.0
Total net sales 0.0 0.0
Cost of goods sold 0.0 0.0
Gross profit (loss) 0.0 0.0
Selling, general and administrative expenses 0.0 0.0
Other operating (income) expense - net 0.0 0.0
Operating income (loss) 0.0 0.0
Interest expense - term loan 0.0  
Interest expense 0.0 0.0
Intercompany interest 0.0 0.0
Interest income 0.0 0.0
Net gain (loss) on forward and derivative contracts 0.0 0.0
Other income (expense) - net 0.0 0.0
Income (loss) before income taxes and equity in earnings of joint ventures 0.0 0.0
Income tax benefit (expense) 0.0 0.0
Income (loss) before equity in earnings of joint ventures 0.0 0.0
Equity in earnings of joint ventures 29.9 20.6
Net income (loss) 29.9 20.6
Other comprehensive income before income tax effect (1.5) (0.9)
Income tax effect 0.0 0.0
Other comprehensive income (loss) (1.5) (0.9)
Total comprehensive income (loss) 28.4 19.7
The Company [Member] | Reportable Legal Entities [Member]    
NET SALES    
Related parties 0.0 0.0
Other customers 0.0 0.0
Total net sales 0.0 0.0
Cost of goods sold 0.0 0.0
Gross profit (loss) 0.0 0.0
Selling, general and administrative expenses 8.4 14.1
Other operating (income) expense - net 0.0 0.0
Operating income (loss) (8.4) (14.1)
Interest expense - term loan (0.7)  
Interest expense (5.1) (5.4)
Intercompany interest 8.4 8.7
Interest income 0.0 0.0
Net gain (loss) on forward and derivative contracts 32.6 (4.7)
Other income (expense) - net 0.3 0.8
Income (loss) before income taxes and equity in earnings of joint ventures 27.1 (14.7)
Income tax benefit (expense) 0.5 1.0
Income (loss) before equity in earnings of joint ventures 27.6 (13.7)
Equity in earnings of joint ventures (30.4) (20.9)
Net income (loss) (2.8) (34.6)
Other comprehensive income before income tax effect 1.7 0.6
Income tax effect (0.3) (0.3)
Other comprehensive income (loss) 1.4 0.3
Total comprehensive income (loss) (1.4) (34.3)
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
NET SALES    
Related parties 147.9 152.5
Other customers 126.3 172.7
Total net sales 274.2 325.2
Cost of goods sold 281.0 327.2
Gross profit (loss) (6.8) (2.0)
Selling, general and administrative expenses 0.0 0.0
Other operating (income) expense - net 0.0 0.0
Operating income (loss) (6.8) (2.0)
Interest expense - term loan 0.0  
Interest expense (0.4) (0.4)
Intercompany interest 2.7 2.5
Interest income 0.0 0.0
Net gain (loss) on forward and derivative contracts 0.4 0.4
Other income (expense) - net (0.1) (0.5)
Income (loss) before income taxes and equity in earnings of joint ventures (4.2) 0.0
Income tax benefit (expense) 0.0 0.0
Income (loss) before equity in earnings of joint ventures (4.2) 0.0
Equity in earnings of joint ventures 0.5 0.3
Net income (loss) (3.7) 0.3
Other comprehensive income before income tax effect 1.1 0.6
Income tax effect 0.0 0.0
Other comprehensive income (loss) 1.1 0.6
Total comprehensive income (loss) (2.6) 0.9
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
NET SALES    
Related parties 123.1 158.8
Other customers 23.9 6.0
Total net sales 147.0 164.8
Cost of goods sold 135.4 175.6
Gross profit (loss) 11.6 (10.8)
Selling, general and administrative expenses 0.5 0.6
Other operating (income) expense - net 0.3 0.3
Operating income (loss) 10.8 (11.7)
Interest expense - term loan 0.0  
Interest expense (0.5) 0.0
Intercompany interest (11.1) (11.2)
Interest income 0.1 0.2
Net gain (loss) on forward and derivative contracts (29.2) (1.4)
Other income (expense) - net 1.5 0.8
Income (loss) before income taxes and equity in earnings of joint ventures (28.4) (23.3)
Income tax benefit (expense) 2.3 1.9
Income (loss) before equity in earnings of joint ventures (26.1) (21.4)
Equity in earnings of joint ventures 0.0 0.5
Net income (loss) (26.1) (20.9)
Other comprehensive income before income tax effect 0.4 0.3
Income tax effect 0.0 0.0
Other comprehensive income (loss) 0.4 0.3
Total comprehensive income (loss) $ (25.7) $ (20.6)
Century Aluminum [Member] | Combined Guarantor Subsidiaries [Member]    
Condensed Statement of Income Captions [Line Items]    
Ownership percentage 100.00%