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DEBT (Tables) | 12 Months Ended
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Dec. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Debt | Debt at December 31 is detailed as follows:
in millions | Effective Interest Rates | 2024 | 2023
Bank line of credit expires 2029 1 |  | $ | 0.0 |  | $ | 0.0 |
Commercial paper expires 2029 1 |  | 0.0 |  | 0.0 |
Total short-term debt |  | $ | 0.0 |  | $ | 0.0 |
Bank line of credit expires 2029 1 |  | $ | 0.0 |  | $ | 0.0 |
Commercial paper expires 2029 1 |  | 550.0 |  | 550.0 |
4.50% notes due 2025 | 4.65% | 400.0 |  | 400.0 |
5.80% notes due 2026 |  | 0.0 |  | 550.0 |
3.90% notes due 2027 | 4.00% | 400.0 |  | 400.0 |
4.95% notes due 2029 | 5.17% | 500.0 |  | 0.0 |
3.50% notes due 2030 | 3.94% | 750.0 |  | 750.0 |
5.35% notes due 2034 | 5.48% | 750.0 |  | 0.0 |
7.15% notes due 2037 | 8.05% | 129.2 |  | 129.2 |
4.50% notes due 2047 | 4.59% | 700.0 |  | 700.0 |
4.70% notes due 2048 | 5.42% | 460.9 |  | 460.9 |
5.70% notes due 2054 | 5.82% | 750.0 |  | 0.0 |
Other notes |  | 1.0 |  | 1.4 |
Total long-term debt - face value |  | $ | 5,391.1 |  | $ | 3,941.5 |
Unamortized discounts and debt issuance costs |  | (83.7) |  | (63.4) |
Fair value adjustments 2 |  | 0.0 |  | (0.3) |
Total long-term debt - book value |  | $ | 5,307.4 |  | $ | 3,877.8 |
Current maturities |  | (400.5) |  | (0.5) |
Total long-term debt - reported value |  | $ | 4,906.9 |  | $ | 3,877.3 |
Estimated fair value of long-term debt |  | $ | 4,762.6 |  | $ | 3,798.0 |
1 Borrowings on the bank line of credit and commercial paper are classified as short-term if we intend to repay within twelve months and as long-term if we have the intent and ability to extend payment beyond twelve months. 2 See Note 5 for additional information on our fair value hedging strategy.
Schedule of Principal and Interest Debt Payments | The total scheduled (principal and interest) debt payments, excluding the line of credit, for the five years subsequent to December 31, 2024 are as follows:
in millions | Total | Principal | Interest
Scheduled Debt Payments (excluding the line of credit) |  |  |
2025 | $ | 649.2 |  | $ | 400.5 |  | $ | 248.7 |
2026 | 233.5 |  | 0.4 |  | 233.1 |
2027 | 624.9 |  | 400.0 |  | 224.9 |
2028 | 217.1 |  | 0.0 |  | 217.1 |
2029 | 1,265.3 |  | 1,050.0 |  | 215.3 |
Schedule of Standby Letters of Credit | Our standby letters of credit as of December 31, 2024 are summarized by purpose in the table below:
in millions |
Risk management insurance | $ | 81.4 |
Reclamation/restoration requirements | 23.4 |
Total standby letters of credit | $ | 104.8 |

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