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Financial Instruments, Guarantees With Off-Balance-Sheet Risk and Other Guarantees | 12 Months Ended
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Dec. 31, 2023
Financial Instruments And Guarantees With Off Balance Sheet Risk Disclosure [Abstract] |
Financial Instruments, Guarantees With Off-Balance-Sheet Risk and Other Guarantees | Financial Instruments, Guarantees With Off-Balance-Sheet Risk and Other Guarantees In the normal course of business, the Company is a party to various guarantees and financial instruments that carry off-balance-sheet risk and are not reflected in the accompanying 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 consolidated balance sheets. The following table summarizes the Company’s financial instruments that carry off-balance-sheet risk.
| December 31, 2023 |  |
| Reclamation Support |  | Other Support (1) |  | Total |  |  |  |  |  |
| (Dollars in millions)
Surety bonds | $ | 1,022.6 |  |  | $ | 117.3 |  |  | $ | 1,139.9 |  |  |  |  |  |  |
Letters of credit (2) | 6.0 |  |  | 102.1 |  |  | 108.1 |  |  |  |  |  |  |
| 1,028.6 |  |  | 219.4 |  |  | 1,248.0 |  |  |  |  |  |  |
Less: Letters of credit in support of surety bonds (3) | (6.0) |  |  | (12.2) |  |  | (18.2) |  |  |  |  |  |  |
Obligations supported, net | $ | 1,022.6 |  |  | $ | 207.2 |  |  | $ | 1,229.8 |  |  |  |  |  |  |
(1) Instruments support obligations related to pension and 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 agreement, the Company was required to post collateral on a periodic basis through December 31, 2025. Prior to the April 2023 amendment, the Company had posted cumulative collateral of $557.8 million, primarily in the form of letters of credit. Under the April 2023 amendment, the Company and its surety providers agreed to a maximum aggregate collateral amount of $721.8 million based upon bonding levels at the effective date of the amendment. This maximum collateral amount represented a negotiated increase from the uncapped cumulative collateral amount prior to the amendment and will vary prospectively as bonding levels increase or decrease. The amendment also removed restrictions on the payment of dividends and share repurchases, and extended the agreement through December 31, 2026. In order to maintain the new maximum collateral standstill, 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 $555.2 million at December 31, 2023. 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, which commenced for the second quarter of 2023. The Company granted second liens on $200.0 million of mining equipment under the original agreement, which remain in force under the April 2023 amendment. To fund the maximum collateral amount, the Company deposited $566.3 million into trust accounts for the benefit of certain surety providers on March 31, 2023. The remainder was comprised of $140.5 million of existing cash-collateralized letters of credit and $15.0 million already held on behalf of a surety provider. The amendment became effective on April 14, 2023, when the Company terminated a then-existing credit agreement which, as amended, provided for $237.2 million of capacity for irrevocable standby letters of credit (LC Facility). All letters of credit that were outstanding under the LC Facility were cancelled upon its termination and, in certain cases, replaced by cash-collateralized letters of credit or letters of credit issued under the Company’s accounts receivable securitization program. LC Facility The now-terminated LC Facility had an original capacity of $324.0 million and was subsequently amended at various dates to reduce its capacity and effect certain other changes, including in February 2023 to reduce capacity by $65.0 million, accelerate the expiration date to December 31, 2023 from December 31, 2024, and eliminate the prepayment premium due upon any reduction of commitments thereunder prior to July 29, 2023. The Company recorded early debt extinguishment losses of $8.8 million during the year ended December 31, 2023 as a result of the February 2023 amendment and subsequent termination. Prior to its termination, undrawn letters of credit under the LC Facility bore interest at 6.00% per annum and unused commitments were subject to a 0.50% per annum commitment fee. 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 Purchase Agreement.) The receivables securitization program authorized under the agreement (Securitization Program) is subject to customary events of default. The Receivables Purchase Agreement was amended in February 2023 to increase the available funding capacity from $175.0 million to $225.0 million and adjust the relevant interest rate for borrowings to a SOFR. Such funding 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. 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 December 31, 2023, the Company had no outstanding borrowings and $108.1 million of letters of credit outstanding under the Securitization Program, primarily in support of reclamation obligations. Availability under the Securitization Program, which is adjusted for certain ineligible receivables, was $90.4 million at December 31, 2023. The Company was not required to post cash collateral under the Securitization Program at December 31, 2023. The Company incurred interest and fees associated with the Securitization Program of $3.6 million, $3.8 million and $2.9 million during the years ended December 31, 2023, 2022 and 2021, respectively, which have been recorded as “Interest expense” in the accompanying statements of operations. Collateralized Letter of Credit Agreement 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 agreement requires 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. The agreement has an initial expiration date of December 31, 2025. At December 31, 2023, letters of credit of $167.0 million were outstanding under the agreement, which were collateralized by cash of $172.0 million. Restricted Cash and Collateral The following table summarizes the Company’s “Restricted cash and collateral” in the accompanying 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 collateral generally includes deposits held by regulatory authorities or financial institutions over which the Company has no control or ability to access.
| December 31, 2023 |  | December 31, 2022
| (Dollars in millions)
Restricted cash (1) |  |  |
Surety trust accounts (2) | $ | 444.0 |  |  | $ | — |
Collateralized letters of credit funding (2) | 172.0 |  |  | 110.3 |
Cash backed bank guarantees (2) | 64.9 |  |  | — |
| 680.9 |  |  | 110.3 |
Other collateral (1) |  |  |
Deposits with regulatory authorities for reclamation and other obligations | 276.7 |  |  | 33.6 |
LC Facility (3) | — |  |  | 28.5 |
Deposit held on behalf of surety | — |  |  | 15.0 |
| 276.7 |  |  | 77.1 |
Restricted cash and collateral | $ | 957.6 |  |  | $ | 187.4 |
(1) Restricted cash balances are combined with unrestricted cash and cash equivalents in the accompanying consolidated statements of cash flows; changes in restricted cash balances are thus not reflected in the operating, investing or financing activities therein. Changes in other collateral balances are reflected as operating activities therein. (2) Surety trust accounts, the funding for collateralized letters of credit and cash supporting the bank guarantees 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) Balance related to the Company’s mandatory repurchase of $30.0 million priority lien obligations under the LC Facility during 2022 at approximately 95%. The Company received approximately $30.0 million upon termination of the LC Facility on April 14, 2023. Other The Company is the lessee under numerous equipment and property leases. It is common in such commercial lease transactions for the Company, as the lessee, to agree to indemnify the lessor for the value of the property or equipment leased, should the property be damaged or lost during the course of the Company’s operations. The Company expects that losses with respect to leased property, if any, may be covered by insurance (subject to deductibles). The Company and certain of its subsidiaries have guaranteed other subsidiaries’ performance under various lease obligations. Aside from indemnification of the lessor for the value of the property leased, the Company’s maximum potential obligations under its leases are equal to the respective future minimum lease payments, and the Company assumes that no amounts could be recovered from third parties. Substantially all of the Company’s U.S. subsidiaries provide financial guarantees under long-term debt agreements entered into by the Company. The maximum amounts payable under the Company’s debt agreements are equal to the respective principal and interest payments.

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