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Accumulated Other Comprehensive Loss (AOCL) - Changes in components of Accumulated other comprehensive 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
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Balance, start       $ 829.6       $ 756.7 $ 829.6 $ 756.7 $ 1,008.8
Other comprehensive (loss) before reclassifications                 (7.3) 20.3 (9.5)
Net amount reclassified to net income (loss)                 0.3 1.9 8.3
Balance, end $ 762.2       $ 829.6       762.2 829.6 756.7
Cost of goods sold                 1,916.1 1,457.8 [1] 1,325.2
Selling, general and administrative expenses                 40.2 44.8 [1] 38.9
Other operating expense, net                 (0.4) (2.1) [1] (3.9)
Helguvik (gains) losses                     152.2
Income tax benefit (expense)                 0.2 (7.6) [1] (2.8)
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]
Defined benefit plan liabilities [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Balance, start       (93.8)       (116.2) (93.8) (116.2) (110.7)
Other comprehensive (loss) before reclassifications                 (7.3) 20.3 (9.5)
Net amount reclassified to net income (loss)                 0.4 2.1 4.0
Balance, end (100.7)       (93.8)       (100.7) (93.8) (116.2)
Unrealized gain (loss) on financial instruments [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Balance, start       2.1       2.3 2.1 2.3 (2.0)
Other comprehensive (loss) before reclassifications                 0.0 0.0 0.0
Net amount reclassified to net income (loss)                 (0.1) (0.2) 4.3
Balance, end 2.0       2.1       2.0 2.1 2.3
Accumulated other comprehensive loss [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Balance, start       $ (91.7)       $ (113.9) (91.7) (113.9) (112.7)
Balance, end $ (98.7)       $ (91.7)       (98.7) (91.7) (113.9)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plan liabilities [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Cost of goods sold                 2.8 3.1 3.5
Selling, general and administrative expenses                 (1.9) (0.4) 0.5
Other operating expense, net                 1.2 1.0 1.6
Income tax benefit (expense)                 (1.6) (1.6) (1.5)
Net income (loss)                 0.5 2.1 4.1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gain (loss) on financial instruments [Member]                      
AOCI Attributable to Parent, Net of Tax [Roll Forward]                      
Cost of goods sold                 (0.2) (0.2) (0.2)
Helguvik (gains) losses                 0.0 0.0 4.5
Income tax benefit (expense)                 0.0 0.0 0.0
Net income (loss)                 $ (0.2) $ (0.2) $ 4.3
[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."