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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (77.9) $ 99.4
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Unrealized loss (gain) on derivative instruments 84.2 (302.3)
Other postretirement benefits gain 0.0 (8.0)
Lower of cost or NRV inventory adjustment 0.0 46.5
Depreciation, depletion and amortization 55.3 57.5
Deferred tax (benefit) provision (23.5) 52.3
Asset impairment 0.0 159.4
Other non-cash items - net (1.2) (12.5)
Change in operating assets and liabilities, net of acquisition:    
Accounts receivable - net 21.4 8.5
Due from affiliates (13.0) (5.6)
Inventories 26.3 (4.1)
Prepaid and other current assets 4.8 5.6
Accounts payable, trade (45.1) (9.6)
Due to affiliates 15.8 (34.0)
Accrued and other current liabilities (2.0) 12.5
Ravenswood retiree medical settlement (2.0) (2.0)
PBGC Settlement (4.5) 0.0
Other - net 1.0 (6.4)
Net cash provided by operating activities 39.6 57.2
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (62.7) (70.2)
Proceeds from sales of property, plant and equipment 25.7 0.1
Acquisition of subsidiary net of cash acquired 19.4 0.0
Net cash used in investing activities (17.6) (70.1)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under revolving credit facilities 575.2 910.2
Repayments under revolving credit facilities (632.0) (910.4)
Debt issuance costs 0.0 (1.6)
Repayment of Iceland Term Facility (9.8) 0.0
Carbon credit proceeds 33.8 0.0
Net cash provided by financing activities 17.2 38.2
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 39.2 25.3
Cash, cash equivalents and restricted cash, beginning of period 55.5 40.7
Cash, cash equivalents and restricted cash, end of period 94.7 66.0
Cash paid for:    
Interest 22.3 14.0
Taxes, net of refunds 1.0 1.9
Non-cash investing activities:    
Capital expenditures 10.2 1.1
Capitalized interest 4.0 3.4
Casthouse Facility    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under Grundartangi casthouse debt facility 40.0 40.0
Vlissingen facility agreement    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under Grundartangi casthouse debt facility $ 10.0 $ 0.0