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DEBT (Tables) | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Debt | Debt is detailed as follows:
in millions | Effective Interest Rates | September 30 2025 | December 31 2024 | September 30 2024
Bank line of credit expires 2029 |  | $ | 0.0 |  | $ | 0.0 |  | $ | 0.0 |
Commercial paper expires 2029 |  | 0.0 |  | 0.0 |  | 0.0 |
Total short-term debt |  | $ | 0.0 |  | $ | 0.0 |  | $ | 0.0 |
Bank line of credit expires 2029 1 |  | $ | 0.0 |  | $ | 0.0 |  | $ | 0.0 |
Commercial paper expires 2029 1 |  | 0.0 |  | 550.0 |  | 550.0 |
4.50% notes due 2025 |  | 0.0 |  | 400.0 |  | 400.0 |
3.90% notes due 2027 | 4.00% | 400.0 |  | 400.0 |  | 400.0 |
4.95% notes due 2029 | 5.17% | 500.0 |  | 500.0 |  | 0.0 |
3.50% notes due 2030 | 3.94% | 750.0 |  | 750.0 |  | 750.0 |
5.35% notes due 2034 | 5.48% | 750.0 |  | 750.0 |  | 0.0 |
7.15% notes due 2037 | 8.05% | 129.2 |  | 129.2 |  | 129.2 |
4.50% notes due 2047 | 4.59% | 700.0 |  | 700.0 |  | 700.0 |
4.70% notes due 2048 | 5.42% | 460.9 |  | 460.9 |  | 460.9 |
5.70% notes due 2054 | 5.82% | 750.0 |  | 750.0 |  | 0.0 |
Other notes |  | 0.4 |  | 1.0 |  | 1.0 |
Total long-term debt - face value |  | $ | 4,440.5 |  | $ | 5,391.1 |  | $ | 3,391.1 |
Unamortized discounts and debt issuance costs |  | (79.7) |  | (83.7) |  | (61.4) |
Total long-term debt - book value |  | $ | 4,360.8 |  | $ | 5,307.4 |  | $ | 3,329.7 |
Current maturities |  | (0.4) |  | (400.5) |  | (0.5) |
Total long-term debt - reported value |  | $ | 4,360.4 |  | $ | 4,906.9 |  | $ | 3,329.2 |
Estimated fair value of long-term debt |  | $ | 4,354.8 |  | $ | 4,762.6 |  | $ | 3,286.9 |
1 Borrowings on the bank line of credit and commercial paper are classified as long-term if we have the intent and ability to extend payment beyond twelve months.
Schedule of Standby Letters of Credit | Our standby letters of credit as of September 30, 2025 are summarized by purpose in the table below:
in millions |
Risk management insurance | $ | 9.8 |
Reclamation/restoration requirements | 18.7 |
Total standby letters of credit | $ | 28.5 |

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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