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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 27.2 $ 280.3
Adjustments to reconcile Net income to net cash provided by operating activities:    
Unrealized loss on derivative instruments 35.2 0.8
Depreciation, depletion and amortization 61.6 64.8
Share-based compensation 14.2 8.1
Loss on early extinguishment of debt 6.2 0.0
Change in deferred tax provision (1.2) 1.7
Bargain purchase gain 0.0 (245.9)
Other non-cash items - net 6.0 (5.7)
Change in operating assets and liabilities:    
Accounts receivable (27.3) (15.9)
Non-trade payables 12.6 7.1
Manufacturing credit receivable (68.5) (71.9)
Due from affiliates 9.4 8.3
Inventories (16.6) (67.5)
Prepaid and other current assets 3.7 9.6
Accounts payable, trade 34.8 40.1
Due to affiliates (6.9) 6.6
Accrued and other current liabilities 0.6 (3.9)
Ravenswood retiree medical settlement (2.0) (2.0)
Other - net (6.8) 2.2
Net cash provided by operating activities 82.2 16.8
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (65.1) (69.1)
Proceeds for joint venture partner's share of co-tenancy assets 15.4 0.0
Proceeds from sale of assets 0.0 2.3
Net cash used in investing activities (49.7) (66.8)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayment of Senior Notes due 2028 (250.0) 0.0
Early redemption premiums paid (4.7) 0.0
Proceeds from issuance of Senior Notes due 2032 400.0 0.0
Payment of deferred financing fees (6.3) 0.0
Carbon credit proceeds 28.1 0.0
Carbon credit repayments (28.3) (10.0)
Net cash provided by (used in) financing activities 84.6 (4.9)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 117.1 (54.9)
Cash, cash equivalents and restricted cash, beginning of period 35.7 90.3
Cash, cash equivalents and restricted cash, end of period 152.8 35.4
Cash paid for:    
Interest 30.9 22.1
Taxes, net of refunds 0.6 5.5
Non-cash investing activities:    
Capital expenditures 2.7 3.0
Capitalized interest 0.0 3.4
Distribution of property, plant and equipment to NCI 3.1 16.1
U.S. and Iceland Revolving Credit Facilities    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under revolving credit facilities 712.8 409.4
Repayments under facilities (750.2) (423.6)
Iceland Term Facility    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayments under facilities 0.0 (1.2)
Casthouse Facility    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under Grundartangi casthouse debt facility 0.0 25.0
Repayments under Grundartangi casthouse debt facility (6.8) (4.5)
Vlissingen Credit Facility    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayments under facilities $ (10.0) $ 0.0