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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (52.3) $ (14.1) $ (167.1)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Lower of cost or NRV inventory adjustment 0.0 39.6 0.0
Unrealized loss (gain) on derivative instruments 87.1 (201.5) 102.9
Depreciation, depletion and amortization 74.7 73.4 82.6
Change in deferred tax (benefit) provision (30.8) 44.2 (30.6)
Asset impairment 0.0 159.4 0.0
Other postretirement benefits gain, net 0.0 (8.9) 0.0
Loss on early extinguishment of debt 0.0 0.0 24.7
Other non-cash items - net 3.4 (22.8) (1.7)
Change in operating assets and liabilities, net of acquisition:      
Accounts receivable - net 36.9 13.7 (16.2)
Non-trade receivables 4.1 0.0 0.0
Manufacturing credit receivable (59.3) 0.0 0.0
Due from affiliates (15.5) 3.6 0.7
Inventories 25.8 (12.8) (134.5)
Prepaid and other current assets 2.9 5.6 (13.4)
Accounts payable, trade (19.4) (15.8) 44.8
Due to affiliates 51.7 (43.5) 38.3
Accrued and other current liabilities 0.0 8.8 5.0
Ravenswood retiree legal settlement (2.0) (2.0) (2.0)
PBGC settlement (4.5) (2.4) 0.0
Other - net 2.8 1.4 1.8
Net cash provided by (used in) operating activities 105.6 25.9 (64.7)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (95.0) (86.3) (83.0)
Proceeds from sale of property, plant and equipment 25.7 0.8 0.4
Acquisition of subsidiary net of cash acquired 11.5 0.0 0.0
Net cash used in investing activities (57.8) (85.5) (82.6)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayment of Senior Notes due 2025 0.0 0.0 (250.0)
Early redemption and tender premiums paid 0.0 0.0 (18.1)
Proceeds from issuance of Senior Notes due 2028 0.0 0.0 250.0
Proceeds from issuance of Convertible Senior Notes 0.0 0.0 86.3
Repayments under Hawesville Term Loan 0.0 0.0 (20.0)
Debt issuance cost 0.0 (1.5) (7.4)
Purchase of capped calls related to Convertible Senior Notes 0.0 0.0 (5.7)
Carbon credit proceeds 36.8 0.0 0.0
Net cash (used in) provided by financing activities (13.0) 74.4 103.7
CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 34.8 14.8 (43.6)
Cash, cash equivalents and restricted cash, beginning of year 55.5 40.7 84.3
Cash, cash equivalents and restricted cash, end of year 90.3 55.5 40.7
Cash paid for:      
Interest 35.2 27.0 36.8
Taxes, net of refunds 5.9 0.9 3.1
Non-cash investing activities:      
Capital expenditures 10.7 3.7 7.1
Capitalized interest 6.0 4.2 1.6
Vlissingen Facility Agreement      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under debt facilities 10.0 0.0 0.0
U.S. and Iceland Revolving Credit Facilities      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under revolving credit facilities 656.9 1,126.2 978.8
Repayments under revolving credit facilities (758.2) (1,114.8) (910.2)
Casthouse Facility      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under debt facilities 55.0 50.0 0.0
Iceland Term Facility      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under revolving credit facilities 0.0 14.5 0.0
Repayments under revolving credit facilities $ (13.5) $ 0.0 $ 0.0