CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (80.8)	$ (66.2)	$ 48.6
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Lower of cost or NRV inventory adjustment	18.8	36.5	(1.1)
Unrealized (gains) on forward and derivative contracts	(11.4)	(6.5)	0.0
Depreciation and amortization	83.2	90.1	84.2
Helguvik (gains) losses	0.0	(4.5)	(7.3)
Ravenswood (gains) losses	0.0	0.0	(5.5)
Net loss on sale of BHH	4.3	0.0	0.0
Other non-cash items - net	(5.9)	(13.2)	(6.7)
Change in operating assets and liabilities:
Accounts receivable - net	12.4	(39.4)	(30.6)
Due from affiliates	(7.1)	(12.4)	6.3
Inventories	4.4	(62.8)	(67.5)
Prepaid and other current assets	2.7	(0.9)	7.8
Accounts payable, trade	(25.2)	30.5	4.7
Due to affiliates	22.6	(10.1)	4.8
Accrued and other current liabilities	2.7	(11.1)	14.5
Ravenswood retiree legal settlement	(2.0)	(2.0)	(5.0)
Other - net	(1.0)	2.9	4.3
Net cash provided by (used in) operating activities	17.7	(69.1)	51.5
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(59.6)	(83.0)	(31.8)
Proceeds from sale of property, plant and equipment	0.0	0.1	14.4
Proceeds from sale of joint venture	20.8	0.0	0.0
Net cash (used in) investing activities	(38.8)	(82.9)	(17.4)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under revolving credit facilities	388.1	120.1	1.3
Repayments under revolving credit facilities	(407.3)	(96.8)	(1.3)
Other short-term borrowings	3.4	0.0	0.0
Repayment on other short-term borrowings	(3.4)	0.0	0.0
Borrowings under term loan	40.0	0.0	0.0
Issuance of common stock	0.3	0.4	0.4
Net cash provided by financing activities	21.1	23.7	0.4
CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	0.0	(128.3)	34.5
Cash, cash equivalents and restricted cash, beginning of year	39.7	168.0	133.5
Cash, cash equivalents and restricted cash, end of year	39.7	39.7	168.0
Supplemental Cash Flow Information:
Interest	21.8	19.7	19.5
Taxes	0.5	13.1	5.6
Capital expenditures	$ 3.0	$ 8.0	$ 0.6

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The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

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The cash inflow from the additional capital contribution to the entity.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash inflow from short-term debt classified as other.

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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash outflow for the payment of debt classified as other, maturing within one year or the operating cycle, if longer.

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No definition available.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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