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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ (1.2) $ 12.8
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized (gain) loss on forward and derivative contracts (1.9) 6.9
Lower of cost or NRV inventory adjustment 5.9 (4.1)
Depreciation and amortization 67.5 63.1
Helguvik (gains) (4.5) 0.0
Ravenswood (gains) 0.0 5.5
Other non-cash items - net (4.0) 3.0
Change in operating assets and liabilities:    
Accounts receivable - net (48.3) (27.9)
Due from affiliates (10.1) 4.8
Inventories (78.8) (24.1)
Prepaid and other current assets 1.8 1.1
Accounts payable, trade 23.4 4.6
Due to affiliates (3.8) 1.5
Accrued and other current liabilities 1.7 9.3
Ravenswood retiree medical settlement (2.0) (5.0)
Other - net (4.7) 9.9
Net cash provided by (used in) operating activities (59.0) 50.4
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (49.3) (23.6)
Proceeds from sales of property, plant & equipment 0.0 14.5
Net cash (used in) investing activities (49.3) (9.1)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under revolving credit facilities 14.3 1.0
Repayments under revolving credit facilities 0.0 (1.0)
Issuance of common stock 0.2 0.3
Net cash provided by financing activities 14.5 0.3
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (93.8) 41.6
Cash, cash equivalents and restricted cash, beginning of period 168.0 133.5
Cash, cash equivalents and restricted cash, end of period 74.2 175.1
Supplemental Cash Flow Information:    
Interest 9.9 10.0
Taxes 4.6 3.5
Capital expenditures $ 6.5 $ 0.0