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Condensed Consolidating Financial Information - Statement of Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
NET SALES    
Related parties $ 311.3 $ 296.2
Other customers 178.7 158.3
Total net sales 490.0 454.5
Cost of goods sold 502.8 440.0
Gross profit (loss) (12.8) 14.5
Selling, general and administrative expenses 14.7 10.7
Other operating expense, net 0.3 0.3
Operating income (loss) (27.8) 3.5
Interest expense (5.8) (5.5)
Intercompany interest 0.0 0.0
Interest income 0.2 0.5
Net gain (loss) on forward and derivative contracts (5.7) 0.7
Other income (expense) - net 1.1 (1.1)
Income (loss) before income taxes and equity in earnings of joint ventures (38.0) (1.9)
Income tax (expense) benefit 2.9 1.0
Income (loss) before equity in earnings of joint ventures (35.1) (0.9)
Equity in earnings (loss) of joint ventures 0.5 0.6
Net income (loss) (34.6) (0.3)
Other comprehensive income (loss) before income tax effect 0.6 0.8
Income tax effect (0.3) (0.4)
Other comprehensive income 0.3 0.4
Total comprehensive income (loss) (34.3) 0.1
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 expense, net 0.0 0.0
Operating income (loss) 0.0 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 (expense) benefit 0.0 0.0
Income (loss) before equity in earnings of joint ventures 0.0 0.0
Equity in earnings (loss) of joint ventures 20.6 (4.9)
Net income (loss) 20.6 (4.9)
Other comprehensive income (loss) before income tax effect (0.9) (1.1)
Income tax effect 0.0 0.0
Other comprehensive income (0.9) (1.1)
Total comprehensive income (loss) 19.7 (6.0)
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 14.1 10.0
Other operating expense, net 0.0 0.0
Operating income (loss) (14.1) (10.0)
Interest expense (5.4) (5.1)
Intercompany interest 8.7 9.0
Interest income 0.0 0.2
Net gain (loss) on forward and derivative contracts (4.7) 0.0
Other income (expense) - net 0.8 0.5
Income (loss) before income taxes and equity in earnings of joint ventures (14.7) (5.4)
Income tax (expense) benefit 1.0 (0.1)
Income (loss) before equity in earnings of joint ventures (13.7) (5.5)
Equity in earnings (loss) of joint ventures (20.9) 5.2
Net income (loss) (34.6) (0.3)
Other comprehensive income (loss) before income tax effect 0.6 0.8
Income tax effect (0.3) (0.4)
Other comprehensive income 0.3 0.4
Total comprehensive income (loss) (34.3) 0.1
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
NET SALES    
Related parties 152.5 110.7
Other customers 172.7 157.5
Total net sales 325.2 268.2
Cost of goods sold 327.2 261.2
Gross profit (loss) (2.0) 7.0
Selling, general and administrative expenses 0.0 0.0
Other operating expense, net 0.0 0.0
Operating income (loss) (2.0) 7.0
Interest expense (0.4) (0.4)
Intercompany interest 2.5 2.3
Interest income 0.0 0.0
Net gain (loss) on forward and derivative contracts 0.4 0.3
Other income (expense) - net (0.5) 0.0
Income (loss) before income taxes and equity in earnings of joint ventures 0.0 9.2
Income tax (expense) benefit 0.0 0.0
Income (loss) before equity in earnings of joint ventures 0.0 9.2
Equity in earnings (loss) of joint ventures 0.3 (0.3)
Net income (loss) 0.3 8.9
Other comprehensive income (loss) before income tax effect 0.6 0.7
Income tax effect 0.0 0.0
Other comprehensive income 0.6 0.7
Total comprehensive income (loss) 0.9 9.6
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
NET SALES    
Related parties 158.8 185.5
Other customers 6.0 0.8
Total net sales 164.8 186.3
Cost of goods sold 175.6 178.8
Gross profit (loss) (10.8) 7.5
Selling, general and administrative expenses 0.6 0.7
Other operating expense, net 0.3 0.3
Operating income (loss) (11.7) 6.5
Interest expense 0.0 0.0
Intercompany interest (11.2) (11.3)
Interest income 0.2 0.3
Net gain (loss) on forward and derivative contracts (1.4) 0.4
Other income (expense) - net 0.8 (1.6)
Income (loss) before income taxes and equity in earnings of joint ventures (23.3) (5.7)
Income tax (expense) benefit 1.9 1.1
Income (loss) before equity in earnings of joint ventures (21.4) (4.6)
Equity in earnings (loss) of joint ventures 0.5 0.6
Net income (loss) (20.9) (4.0)
Other comprehensive income (loss) before income tax effect 0.3 0.4
Income tax effect 0.0 0.0
Other comprehensive income 0.3 0.4
Total comprehensive income (loss) $ (20.6) $ (3.6)
Century Aluminum [Member] | Combined Guarantor Subsidiaries [Member]    
Condensed Statement of Income Captions [Line Items]    
Ownership percentage 100.00%