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Financial Instruments and Other Guarantees | 9 Months Ended
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Sep. 30, 2025
Financial Instruments And Guarantees [Abstract] |
Financial Instruments and Other Guarantees | Financial Instruments and Other Guarantees In the normal course of business, the Company is a party to various guarantees and financial instruments that carry off-balance-she et risk and are not reflected in the accompanying condensed consolidated balance sheets. Such financial instruments provide support for the Company’s reclamation bonding requirements, lease obligations, insurance policies and various other performance guarantees. The Company periodically evaluates the instruments for on-balance-sheet treatment based on the amount of exposure under the instrument and the likelihood of required performance. The Company does not expect any material losses to result from these guarantees or off-balance-sheet instruments in excess of liabilities provided for in the accompanying condensed consolidated balance sheets. The following table summarizes the Company’s financial instruments that carry off-balance-sheet risk.
| September 30, 2025
| Reclamation Support |  | Other Support (1) |  | Total
| (Dollars in millions)
Surety bonds | $ | 924.8 |  |  | $ | 88.3 |  |  | $ | 1,013.1 |
Letters of credit (2) | 55.2 |  |  | 56.6 |  |  | 111.8 |
| 980.0 |  |  | 144.9 |  |  | 1,124.9 |
Less: Letters of credit in support of surety bonds (3) | (55.2) |  |  | (0.1) |  |  | (55.3) |
Obligations supported, net | $ | 924.8 |  |  | $ | 144.8 |  |  | $ | 1,069.6 |
(1) Instruments support obligations related to leases, health care plans, workers’ compensation, property and casualty insurance, customer and vendor contracts and certain restoration ancillary to prior mining activities. (2) Amounts do not include cash-collateralized letters of credit. (3) Certain letters of credit serve as collateral for surety bonds at the request of surety bond providers. Surety Agreement Amendment and Collateral Requirements In April 2023, the Company amended its existing agreement with the providers of its surety bond portfolio, dated November 6, 2020. Under the April 2023 amendment, the Company and its surety providers agreed to a maximum aggregate collateral amount based upon bonding levels which will vary prospectively as bonding levels increase or decrease. The amendment also extended the agreement through December 31, 2026. In order to maintain the maximum collateral agreement, the Company must remain compliant with a minimum liquidity test and a maximum net leverage ratio, as measured each quarter. The minimum liquidity test requires the Company to maintain liquidity at the greater of $400 million or the difference between the penal sum of all surety bonds and the amount of collateral posted in favor of surety providers, which was $493.9 million at September 30, 2025. The Company must also maintain a maximum net leverage ratio of 1.5 to 1.0, where the numerator consists of its funded debt, net of cash, and the denominator consists of its Adjusted EBITDA for the trailing twelve months. For purposes of calculating the ratio, only 50% of the outstanding principal amount of the Company’s 2028 Convertible Notes is deemed to be funded debt. The Company’s ability to pay dividends and make share repurchases is also subject to the quarterly minimum liquidity test. The Company is in compliance with such requirements at September 30, 2025. At September 30, 2025, the Company’s maximum aggregate collateral amount was $519.2 million, which was comprised of $392.8 million in trust accounts and letters of credit of $126.4 million held for the benefit of certain surety providers. Accounts Receivable Securitization In 2017, the Company entered into the Sixth Amended and Restated Receivables Purchase Agreement, as amended from time to time. The receivables securitization program authorized under the agreement (Securitization Program) is subject to customary events of default. The Securitization Program provides up to $225.0 million of funding capacity which is accounted for as a secured borrowing, limited to the availability of eligible receivables, and may be secured by a combination of collateral and the trade receivables underlying the program. Funding capacity under the Securitization Program may also be utilized for letters of credit in support of other obligations, which has been the Company’s primary utilization. The accounts receivable securitization program was amended in January 2025 to extend its maturity to January 2028. During the nine months ended September 30, 2025, the Company capitalized $1.8 million of debt issuance costs related to the amendment. Borrowings under the Securitization Program bear interest at SOFR plus 2.1% per annum and remain outstanding throughout the term of the agreement, subject to the Company maintaining sufficient eligible receivables. At September 30, 2025, the Company had no outstanding borrowings and $62.5 million of letters of credit outstanding under the Securitization Program. Availability under the Securitization Program, which is adjusted for certain ineligible receivables, was $77.2 million at September 30, 2025. The Company was not required to post cash collateral under the Securitization Program at September 30, 2025. The Company incurred interest and fees associated with the Securitization Program of $0.6 million and $0.5 million during the three months ended September 30, 2025 and 2024, respectively, and $1.8 million and $1.9 million during the nine months ended September 30, 2025 and 2024, respectively, which have been recorded as “Interest expense, net of capitalized interest” in the accompanying unaudited condensed consolidated statements of operations. Credit Support Facilities In February 2022, the Company entered into an agreement which provides up to $250.0 million of capacity for irrevocable standby letters of credit, primarily to support reclamation bonding requirements. The initial agreement required the Company to provide cash collateral at a level of 103% of the aggregate amount of letters of credit outstanding under the arrangement (limited to $5.0 million total excess collateralization). Outstanding letters of credit bear a fixed fee in the amount of 0.75% per annum. The Company receives a variable deposit rate on the amount of cash collateral posted in support of letters of credit. At September 30, 2025, letters of credit of $115.6 million were outstanding under the agreement, which were collateralized by cash of $119.1 million. The agreement was amended on November 3, 2025, to (i) extend the expiration date to December 31, 2030 and (ii) change the required minimum cash collateral amount to 102% of the aggregate amount of letters of credit outstanding under the agreement, provided that in the event the Company’s credit rating falls below certain thresholds, the minimum collateral amount shall increase to 103%. In December 2023, the Company established cash-backed bank guarantee facilities, primarily to support Australian reclamation bonding requirements. The Company receives a variable deposit rate on the amount of cash collateral posted in support of the bank guarantee facilities, which mature at various dates between 2026 and 2029. At September 30, 2025, the bank guarantee facilities were backed by cash of $205.9 million. Restricted Cash and Collateral The following table summarizes the Company’s “Restricted cash and collateral” in the accompanying condensed consolidated balance sheets. Restricted cash balances are held in controlled accounts with minimum balance requirements; withdrawals are subject to the approval of account beneficiaries, such as the Company’s surety providers, who have perfected security interests in the funds. The Company’s other cash collateral generally includes deposits held by regulatory authorities or financial institutions over which the Company has no control or ability to access. Portions of the restricted cash balances and deposits are held in accounts denominated in Australian dollars.
| September 30, 2025 |  | December 31, 2024
| (Dollars in millions)
Restricted cash (1) |  |  |
Surety trust accounts (2) | $ | 392.8 |  |  | $ | 394.6 |
Credit support facilities (2) (3) | 325.0 |  |  | 287.6 |
| 717.8 |  |  | 682.2 |
Other cash collateral (1) |  |  |
Deposits with regulatory authorities for reclamation and other obligations (3) | 133.2 |  |  | 127.6 |
Restricted cash and collateral | $ | 851.0 |  |  | $ | 809.8 |
(1) Restricted cash balances are combined with unrestricted cash and cash equivalents in the accompanying unaudited condensed consolidated statements of cash flows; changes between unrestricted cash and cash equivalents and restricted cash balances are thus not reflected in the operating, investing or financing activities therein. Changes in other cash collateral balances are reflected as operating activities therein. (2) Surety trust accounts, the funding for collateralized letters of credit and cash supporting the bank guarantee facilities are comprised of highly liquid investments with original maturities of three months or less; interest and other earnings on such funds accrue to the Company. (3) At September 30, 2025, the Australian dollar denominated balances supporting the bank guarantee facilities and the deposits with regulatory authorities were $312 million and $201 million, respectively. At December 31, 2024, the Australian dollar denominated balances supporting the bank guarantee facilities and the deposits with regulatory authorities were $271 million and $205 million, respectively.

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