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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ (66.2) $ 48.6 [1],[2] $ (252.4) [1]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Lower of cost or NRV inventory adjustment 36.5 (1.1) [1] (0.7) [1]
Unrealized (gains) on forward and derivative contracts (6.5) 0.0 [1] 0.0 [1]
Depreciation and amortization 90.1 84.2 [1] 84.8 [1]
Helguvik (gains) losses (4.5) (7.3) [1],[2] 152.2 [1]
Ravenswood (gains) losses 0.0 (5.5) [1] 3.8 [1]
Other non-cash items - net (13.2) (6.7) [1] 1.8 [1]
Change in operating assets and liabilities:      
Accounts receivable - net (39.4) (30.6) [1] (3.0) [1]
Due from affiliates (12.4) 6.3 [1] 0.8 [1]
Inventories (62.8) (67.5) [1] 0.9 [1]
Prepaid and other current assets (0.9) 7.8 [1] 18.3 [1]
Accounts payable, trade 30.5 4.7 [1] 2.3 [1]
Due to affiliates (10.1) 4.8 [1] 7.2 [1]
Accrued and other current liabilities (11.1) 14.5 [1] (3.9) [1]
Ravenswood retiree legal settlement (2.0) (5.0) [1] 23.0 [1]
Other - net 2.9 4.3 [1] 3.1 [1]
Net cash provided by (used in) operating activities (69.1) 51.5 [1] 38.2 [1]
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (83.0) (31.8) [1] (21.9) [1]
Proceeds from sale of property, plant and equipment 0.1 14.4 [1] 1.0 [1]
Net cash (used in) investing activities (82.9) (17.4) [1] (20.9) [1]
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under revolving credit facilities 120.1 1.3 [1] 1.2 [1]
Repayments under revolving credit facilities (96.8) (1.3) [1] (1.2) [1]
Issuance of common stock 0.4 0.4 [1] 0.0 [1]
Net cash provided by financing activities 23.7 0.4 [1] 0.0 [1]
CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH (128.3) 34.5 [1] 17.3 [1]
Cash, cash equivalents and restricted cash, beginning of year [1] 168.0 133.5 116.2
Cash, cash equivalents and restricted cash, end of year 39.7 168.0 [1] 133.5 [1]
Supplemental Cash Flow Information:      
Interest 19.7 19.5 [1] 19.5 [1]
Taxes 13.1 5.6 [1] 13.9 [1]
Capital expenditures $ 8.0 $ 0.6 [1] $ 3.0 [1]
[1] As adjusted due to the adoption of ASU 2016-18 "Statement of Cash Flows (Topic 230) Restricted Cash."
[2] 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