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Notes Payable and Credit Agreements (Tables) | 12 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Short-Term Debt | 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 Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + 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(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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