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Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2024
Guarantees and Product Warranties [Abstract] |
Financial Instruments and Guarantees with Off Balance Sheet Risk | The following table summarizes the Company’s financial instruments that carry off-balance-sheet risk.
| December 31, 2024 |  |
| Reclamation Support |  | Other Support (1) |  | Total |  |  |  |  |  |
| (Dollars in millions)
Surety bonds | $ | 925.1 |  |  | $ | 92.4 |  |  | $ | 1,017.5 |  |  |  |  |  |  |
Letters of credit (2) | 55.2 |  |  | 91.5 |  |  | 146.7 |  |  |  |  |  |  |
| 980.3 |  |  | 183.9 |  |  | 1,164.2 |  |  |  |  |  |  |
Less: Letters of credit in support of surety bonds (3) | (55.2) |  |  | (0.1) |  |  | (55.3) |  |  |  |  |  |  |
Obligations supported, net | $ | 925.1 |  |  | $ | 183.8 |  |  | $ | 1,108.9 |  |  |  |  |  |  |
(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.
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 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.
| December 31,
| 2024 |  | 2023
| (Dollars in millions)
Restricted cash (1) |  |  |
Surety trust accounts (2) | $ | 394.6 |  |  | $ | 444.0 |
Credit support facilities (2) (3) | 287.6 |  |  | 236.9 |
| 682.2 |  |  | 680.9 |
Other cash collateral (1) |  |  |
Deposits with regulatory authorities for reclamation and other obligations (3) | 127.6 |  |  | 276.7 |
Restricted cash and collateral | $ | 809.8 |  |  | $ | 957.6 |
(1) Restricted cash balances are combined with unrestricted cash and cash equivalents in the accompanying 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 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. At December 31, 2023, the Australian dollar denominated balances supporting the bank guarantee facilities and the deposits with regulatory authorities were $95 million and $404 million, respectively.

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