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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net Income (loss) $ 320.7 $ (52.3) $ (14.1)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:      
Lower of cost or NRV inventory adjustment 2.3 0.0 39.6
Unrealized (gain) loss on derivative instruments (5.0) 87.1 (201.5)
Depreciation, depletion and amortization 81.8 74.7 73.4
Change in deferred tax (benefit) provision (1.3) (30.8) 44.2
Asset impairment 0.0 0.0 159.4
Gain on sale of assets (2.3) 0.0 0.0
Bargain purchase gain (245.9) 0.0 0.0
Force majeure settlement (12.3) 0.0 0.0
Other postretirement benefits gain, net 0.0 0.0 (8.9)
Other non-cash items - net 9.1 3.4 (22.8)
Change in operating assets and liabilities, net of acquisition:      
Accounts receivable - net (18.3) 36.9 13.7
Non-trade receivables 31.5 4.1 0.0
Manufacturing credit receivable (92.6) (59.3) 0.0
Due from affiliates (4.9) (15.5) 3.6
Inventories (64.3) 25.8 (12.8)
Prepaid and other current assets 1.0 2.9 5.6
Accounts payable, trade (50.6) (19.4) (15.8)
Due to affiliates 26.1 51.7 (43.5)
Accrued and other current liabilities (1.2) 0.0 8.8
Ravenswood retiree legal settlement (2.0) (2.0) (2.0)
PBGC settlement (0.3) (4.5) (2.4)
Other - net 3.9 2.8 1.4
Net cash (used in) provided by operating activities (24.6) 105.6 25.9
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (82.3) (95.0) (86.3)
Proceeds from co-tenancy assets at Jamalco JV 12.7 0.0 0.0
Proceeds from sale of property, plant and equipment 2.3 25.7 0.8
Acquisition of subsidiary net of cash acquired 0.0 11.5 0.0
Net cash used in investing activities (67.3) (57.8) (85.5)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Debt issuance cost 0.0 0.0 (1.5)
Carbon credit proceeds 0.0 36.8 0.0
Carbon credit repayments (10.0) 0.0 0.0
Net cash provided by (used in) financing activities 37.3 (13.0) 74.4
CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH (54.6) 34.8 14.8
Cash, cash equivalents and restricted cash, beginning of year 90.3 55.5 40.7
Cash, cash equivalents and restricted cash, end of year 35.7 90.3 55.5
Cash paid for:      
Interest 36.0 35.2 27.0
Taxes, net of refunds 14.5 5.9 0.9
Non-cash investing activities:      
Capital expenditures 12.3 10.7 3.7
Capitalized interest 3.4 6.0 4.2
Distribution of fixed assets to NCI 17.0 0.0 0.0
U.S. and Iceland Revolving Credit Facilities      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowing under revolving credit or term facility 735.4 656.9 1,126.2
Repayments under revolving credit or term facility (705.1) (758.2) (1,114.8)
Casthouse Facility      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayments under revolving credit or term facility (6.8) 0.0 0.0
Borrowings under facility agreements 25.0 55.0 50.0
Iceland Term Facility      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowing under revolving credit or term facility 0.0 0.0 14.5
Repayments under revolving credit or term facility (1.2) (13.5) 0.0
Vlissingen Facility Agreement      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under facility agreements $ 0.0 $ 10.0 $ 0.0