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Notes Payable and Credit Agreements | 12 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Notes Payable and Credit Agreements | 7. NOTES PAYABLE AND CREDIT AGREEMENTS Spire, Spire Missouri and Spire Alabama have a syndicated revolving credit facility pursuant to a loan agreement with 12 banks through October 11, 2029. The loan agreement has an aggregate credit commitment of $1,500.0, including sublimits of $525.0 for the Spire holding company, $700.0 for Spire Missouri and $275.0 for Spire Alabama. These sublimits may be reallocated from time to time among the three borrowers within the $1,500.0 aggregate commitment, with commitment fees and interest margins applied for each borrower relative to its credit rating. The Spire holding company may use its line to provide for the funding needs of various subsidiaries. The agreement also contains financial covenants limiting each borrower’s consolidated total debt, including short-term debt, to no more than 70% of its total capitalization. As defined in the line of credit, on September 30, 2025, total debt was less than 65% of total capitalization for each borrower. There were no borrowings against this credit facility as of September 30, 2025 and 2024. Spire has a commercial paper program (“CP Program”) pursuant to which it may issue short-term, unsecured commercial paper notes. Amounts available under the CP Program may be borrowed, repaid and re-borrowed from time to time, with the aggregate face or principal amount of the notes outstanding under the CP Program at any time not to exceed $1,500.0. The notes may have maturities of up to 365 days from date of issue. On January 3, 2024, Spire Missouri entered into a short-term loan agreement with several banks for a $200.0 unsecured term loan. Interest accrued at the one-month term secured overnight financing rate (“SOFR”) plus a SOFR adjustment of 0.10% per annum plus a margin of 0.90% per annum. Spire Missouri repaid $50.0 of this loan on April 5, 2024 and the remaining $150.0 balance on May 6, 2024. Information about short-term borrowings, including Spire Missouri’s and Spire Alabama’s borrowings from Spire, is presented in the following table. As of September 30, 2025, $741.0 of Spire’s short-term borrowings were used to support lending to the Utilities.
|  | Spire |  |  | Spire |  |  | Spire |  |  |  |
|  | (Parent Only) |  |  | Missouri |  |  | Alabama |  |  | Spire |
|  | CP |  |  |  | Spire |  |  | Spire |  |  | Consol- |
|  | Program |  |  |  | Note |  |  | Note |  |  | idated |
Year Ended September 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Highest borrowings outstanding |  | $ | 1,348.0 |  |  |  | $ | 615.0 |  |  | $ | 130.6 |  |  | $ | 1,348.0 |
Lowest borrowings outstanding |  |  | 896.0 |  |  |  |  | 299.5 |  |  |  | 1.2 |  |  |  | 896.0 |
Weighted average borrowings |  |  | 1,085.7 |  |  |  |  | 482.6 |  |  |  | 50.8 |  |  |  | 1,085.7 |
Weighted average interest rate |  |  | 4.5 | % |  |  |  | 4.7 | % |  |  | 4.7 | % |  |  | 4.5 | %
As of September 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  | $ | 1,317.0 |  |  |  | $ | 566.3 |  |  | $ | 130.1 |  |  | $ | 1,317.0 |
Weighted average interest rate |  |  | 4.4 | % |  |  |  | 4.4 | % |  |  | 4.4 | % |  |  | 4.4 | %
As of September 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  | $ | 947.0 |  |  |  | $ | 495.3 |  |  | $ | 48.4 |  |  | $ | 947.0 |
Weighted average interest rate |  |  | 5.2 | % |  |  |  | 5.2 | % |  |  | 5.2 | % |  |  | 5.2 | %
For additional information regarding the pending acquisition of Tennessee natural gas business from Piedmont Natural Gas, see Note 18 – Business Combinations, which is supported by a fully committed bridge financing facility discussed therein.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A Reference 2: http://www.xbrl.org/2003/role/disclosureRef 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