CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 327.0	$ 22.4
Adjustments to reconcile Net income to net cash provided by operating activities:
Unrealized loss on derivative instruments	48.0	3.0
Depreciation, depletion and amortization	22.7	24.0
Share-based compensation	9.4	1.9
Net periodic benefit cost	9.5	2.8
Change in deferred tax provision	2.2	1.2
Gain on the sale of Hawesville	(287.9)	0.0
Gain on insurance proceeds received for property damage	(1.0)	0.0
Other non-cash items - net	0.9	(4.7)
Change in operating assets and liabilities:
Accounts receivable	(8.9)	(12.5)
Non-trade receivables	1.0	15.4
Manufacturing credit receivable	(25.6)	(20.7)
Due from affiliates	(23.0)	16.7
Inventories	6.8	(0.1)
Prepaid and other current assets	1.1	4.0
Accounts payable, trade	24.7	20.8
Due to affiliates	(19.8)	12.2
Accrued and other current liabilities	(11.0)	(13.9)
Other - net	(7.7)	(0.2)
Net cash provided by operating activities	68.4	72.3
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(74.8)	(21.2)
Proceeds from the sale of Hawesville	200.0	0.0
Insurance proceeds received for property damage	5.0	0.0
Net cash provided by (used in) investing activities	130.2	(21.2)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of incentive compensation withholding taxes	(4.7)	0.0
Contributions from joint venture partner	7.0	5.7
Net cash used in financing activities	(0.6)	(39.1)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	198.0	12.0
Cash, cash equivalents and restricted cash, beginning of period	135.6	35.7
Cash, cash equivalents and restricted cash, end of period	333.6	47.7
Cash paid for:
Interest	16.3	4.9
Taxes, net of refunds	0.7	2.3
Non-cash investing activities:
Capital expenditures	11.5	4.1
U.S. and Iceland Revolving Credit Facilities
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under revolving credit facilities	160.6	257.6
Repayments under revolving credit facilities	(155.7)	(300.1)
Industrial revenue bonds
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments under Grundartangi casthouse debt facility	(7.8)	0.0
Casthouse Facility
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments under Grundartangi casthouse debt facility	$ 0.0	$ (2.3)