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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
NET SALES:                      
Related parties                 $ 1,204.5 $ 1,198.1 [1] $ 1,178.6
Other customers                 688.7 391.0 [1] 140.5
Total net sales $ 486.9 $ 481.8 $ 470.0 $ 454.5 $ 433.9 $ 400.6 $ 388.8 $ 365.8 1,893.2 1,589.1 [1] 1,319.1
Cost of goods sold                 1,916.1 1,457.8 [1] 1,325.2
Gross profit (loss) (59.3) (11.8) 33.7 14.5 47.9 41.4 22.5 16.8 (22.9) 131.3 [1] (6.1)
Selling, general and administrative expenses                 40.2 44.8 [1] 38.9
Helguvik (gains) losses                 (4.5) (7.3) [1],[2] 152.2 [2]
Ravenswood (gains)                 0.0 (5.5) [1] 26.8
Other operating expense - net                 0.4 2.1 [1] 3.9
Operating income (loss)                 (59.0) 97.2 [1] (227.9)
Interest expense                 (22.4) (22.2) [1] (22.2)
Intercompany Interest                 0.0 0.0 0.0
Interest income                 1.5 1.4 [1] 0.8
Net gain (loss) on forward and derivative contracts               (16.1) 6.3 (16.5) [1] 3.5
Other income (expense) - net                 3.0 (4.5) [1] (5.1)
Income (loss) before income taxes and equity in earnings of joint ventures                 (70.6) 55.4 [1] (250.9)
Income tax (expense) benefit                 0.2 (7.6) [1] (2.8)
Income (loss) before equity in earnings of joint ventures                 (70.4) 47.8 [1] (253.7)
Equity in earnings of joint ventures                 4.2 0.8 [1] 1.3
Net income (loss) $ (65.0) $ (20.3) $ 19.4 $ (0.3) $ 35.8 $ 20.8 $ 7.1 $ (15.1) (66.2) 48.6 [1],[2] (252.4) [2]
Other comprehensive income (loss) before income tax effect                 (5.5) 23.7 0.3
Income tax effect                 (1.5) (1.5) (1.5)
Other comprehensive income (loss)                 (7.0) 22.2 (1.2)
Total comprehensive income (loss)                 $ (73.2) 70.8 (253.6)
Combined Guarantor Subsidiaries [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                 23.3 27.2 19.4
Helguvik (gains) losses                 0.0 0.0 0.0
Ravenswood (gains)                   0.0 0.0
Other operating expense - net                 0.0 0.0 0.0
Operating income (loss)                 (23.3) (27.2) (19.4)
Interest expense                 (20.6) (20.4) (20.3)
Intercompany Interest                 36.3 37.3 39.2
Interest income                 0.3 0.5 0.2
Net gain (loss) on forward and derivative contracts                 1.3 0.0 0.0
Other income (expense) - net                 2.1 0.2 (0.1)
Income (loss) before income taxes and equity in earnings of joint ventures                 (3.9) (9.6) (0.4)
Income tax (expense) benefit                 2.6 0.5 1.9
Income (loss) before equity in earnings of joint ventures                 (1.3) (9.1) 1.5
Equity in earnings of joint ventures                 (64.9) 57.7 (253.9)
Net income (loss)                 (66.2) 48.6 (252.4)
Other comprehensive income (loss) before income tax effect                 (5.5) 23.7 0.3
Income tax effect                 (1.5) (1.5) (1.5)
Other comprehensive income (loss)                 (7.0) 22.2 (1.2)
Total comprehensive income (loss)                 (73.2) 70.8 (253.6)
Reportable Legal Entities [Member] | Combined Guarantor Subsidiaries [Member]                      
NET SALES:                      
Related parties                 453.6 547.5 668.5
Other customers                 685.0 390.9 140.4
Total net sales                 1,138.6 938.4 808.9
Cost of goods sold                 1,169.2 885.5 857.7
Gross profit (loss)                 (30.6) 52.9 (48.8)
Selling, general and administrative expenses                 11.6 12.9 9.9
Helguvik (gains) losses                 0.0 0.0 0.0
Ravenswood (gains)                   0.0 0.0
Other operating expense - net                 0.0 0.0 0.0
Operating income (loss)                 (42.2) 40.0 (58.7)
Interest expense                 (1.6) (1.6) (1.7)
Intercompany Interest                 9.5 8.6 8.1
Interest income                 0.0 0.0 0.0
Net gain (loss) on forward and derivative contracts                 1.4 (17.0) 3.5
Other income (expense) - net                 (1.9) 0.4 (4.7)
Income (loss) before income taxes and equity in earnings of joint ventures                 (34.8) 30.4 (53.5)
Income tax (expense) benefit                 0.0 0.9 0.0
Income (loss) before equity in earnings of joint ventures                 (34.8) 31.3 (53.5)
Equity in earnings of joint ventures                 0.6 2.7 12.5
Net income (loss)                 (34.2) 34.0 (41.0)
Other comprehensive income (loss) before income tax effect                 (24.2) 12.7 1.9
Income tax effect                 0.0 0.0 0.0
Other comprehensive income (loss)                 (24.2) 12.7 1.9
Total comprehensive income (loss)                 (58.4) 46.7 (39.1)
Reportable Legal Entities [Member] | Combined Non-Guarantor Subsidiaries [Member]                      
NET SALES:                      
Related parties                 750.9 650.6 510.1
Other customers                 3.7 0.1 0.1
Total net sales                 754.6 650.7 510.2
Cost of goods sold                 746.9 572.3 467.5
Gross profit (loss)                 7.7 78.4 42.7
Selling, general and administrative expenses                 5.3 4.7 9.6
Helguvik (gains) losses                 (4.5) (7.3) 152.2
Ravenswood (gains)                   (5.5) 26.8
Other operating expense - net                 0.4 2.1 3.9
Operating income (loss)                 6.5 84.4 (149.8)
Interest expense                 (0.2) (0.2) (0.2)
Intercompany Interest                 (45.8) (45.9) (47.3)
Interest income                 1.2 0.9 0.6
Net gain (loss) on forward and derivative contracts                 3.6 0.5 0.0
Other income (expense) - net                 2.8 (5.1) (0.3)
Income (loss) before income taxes and equity in earnings of joint ventures                 (31.9) 34.6 (197.0)
Income tax (expense) benefit                 (2.4) (9.0) (4.7)
Income (loss) before equity in earnings of joint ventures                 (34.3) 25.6 (201.7)
Equity in earnings of joint ventures                 4.2 0.8 1.3
Net income (loss)                 (30.1) 26.4 (200.4)
Other comprehensive income (loss) before income tax effect                 5.2 1.5 5.1
Income tax effect                 0.0 0.0 0.0
Other comprehensive income (loss)                 5.2 1.5 5.1
Total comprehensive income (loss)                 (24.9) 27.9 (195.3)
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 (gains) losses                 0.0 0.0 0.0
Ravenswood (gains)                   0.0 0.0
Other operating expense - net                 0.0 0.0 0.0
Operating income (loss)                 0.0 0.0 0.0
Interest expense                 0.0 0.0 0.0
Intercompany Interest                 0.0 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
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
Equity in earnings of joint ventures                 64.3 (60.4) 241.4
Net income (loss)                 64.3 (60.4) 241.4
Other comprehensive income (loss) before income tax effect                 19.0 (14.2) (7.0)
Income tax effect                 0.0 0.0 0.0
Other comprehensive income (loss)                 19.0 (14.2) (7.0)
Total comprehensive income (loss)                 $ 83.3 $ (74.6) $ 234.4
[1] As adjusted due to the adoption of ASU 2017-07 Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost
[2] As adjusted due to the adoption of ASU 2016-18 "Statement of Cash Flows (Topic 230) Restricted Cash."