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Leases | 12 Months Ended
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Sep. 30, 2025
Leases [Abstract] |
Leases | 17. LEASES The lease agreement covering the Company’s primary office space in St. Louis extends through February 2035, with an option to renew for an additional five years. Spire Alabama’s lease agreement for office space in Birmingham extends through January 2037, with an option to renew for two additional five-year terms. The lease agreement covering Spire Marketing and Spire Storage office space in Houston extends through December 2028, with options to terminate three years earlier or to renew for an additional five years. The renewal options in the St. Louis and Houston leases were deemed reasonably certain to be exercised and are included in the lease term used to determine the right-of-use assets and lease liabilities. The Company and its subsidiaries have other relatively minor rental arrangements for real estate and equipment with remaining terms of up to nine years. Operating lease cost, cash flow and noncash information are shown in the following table.
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2025 |  |  | 2024 |  |  | 2023 |  |  | 2025 |  |  | 2024 |  |  | 2023 |  |  | 2025 |  |  | 2024 |  |  | 2023 |
Operating lease cost, including amounts capitalized |  | $ | 7.1 |  |  | $ | 7.3 |  |  | $ | 7.3 |  |  | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 2.0 |
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities |  |  | 7.3 |  |  |  | 7.4 |  |  |  | 7.3 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 2.2 |  |  |  | 2.1 |  |  |  | 2.1 |
Right-of-use assets obtained in exchange for lease liabilities |  |  | — |  |  |  | — |  |  |  | 0.8 |  |  |  | — |  |  |  | — |  |  |  | 0.8 |  |  |  | — |  |  |  | — |  |  |  | — |
The following table shows year-end balance sheet and weighted-average information about operating leases.
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Right-of-use assets |  | $ | 59.2 |  |  | $ | 63.1 |  |  | $ | 1.6 |  |  | $ | 1.7 |  |  | $ | 17.0 |  |  | $ | 18.1 |
Lease liabilities, current |  |  | 6.1 |  |  |  | 6.6 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 2.0 |  |  |  | 1.9 |
Lease liabilities, noncurrent |  |  | 59.1 |  |  |  | 62.7 |  |  |  | 1.2 |  |  |  | 1.3 |  |  |  | 20.9 |  |  |  | 22.3 |
Weighted-average remaining lease term (in years) |  |  | 12.6 |  |  |  | 13.5 |  |  |  | 4.8 |  |  |  | 5.1 |  |  |  | 11.3 |  |  |  | 12.3 |
Weighted-average discount rate |  |  | 4.2 | % |  |  | 4.2 | % |  |  | 3.8 | % |  |  | 3.4 | % |  |  | 3.7 | % |  |  | 3.7 | %
On the balance sheets, right-of-use assets are included in “Deferred Charges and Other Assets: Other,” current lease liabilities are in “Current Liabilities: Other,” and noncurrent lease liabilities are in “Deferred Credits and Other Liabilities: Other.” Following is a maturity analysis by fiscal year for operating lease liabilities as of September 30, 2025.
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
2026 |  | $ | 6.3 |  |  | $ | 0.5 |  |  | $ | 2.0 |
2027 |  |  | 6.7 |  |  |  | 0.4 |  |  |  | 2.3 |
2028 |  |  | 6.8 |  |  |  | 0.3 |  |  |  | 2.3 |
2029 |  |  | 6.7 |  |  |  | 0.3 |  |  |  | 2.4 |
2030 |  |  | 6.7 |  |  |  | 0.2 |  |  |  | 2.4 |
Thereafter |  |  | 51.3 |  |  |  | 0.2 |  |  |  | 16.9 |
Total undiscounted lease payments |  |  | 84.5 |  |  |  | 1.9 |  |  |  | 28.3 |
Less present value discount |  |  | (19.3 | ) |  |  | (0.2 | ) |  |  | (5.4 | )
Total current and noncurrent lease liabilities |  | $ | 65.2 |  |  | $ | 1.7 |  |  | $ | 22.9 |
There are no significant finance leases, short-term leases, subleases, variable lease payments, residual value guarantees, restrictions or covenants pertaining to leases. The Company elected, for all asset classes, not to recognize right-of-use assets and lease liabilities for short-term leases. Instead, the lease payments for short-term leases are recognized in profit or loss on a straight-line basis over the lease term and variable lease payments are recognized in the period in which the obligation for those payments is incurred. The Company elected, for all asset classes, not to separate non-lease components from lease components and instead to account for each separate lease component and the non-lease components associated with that lease component as a single lease component. The discount rate used for all the leases is the applicable incremental borrowing rate, which is the rate of interest that a lessee would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. For a subsidiary lessee, the rate applicable to the subsidiary is used unless the lease terms are influenced by parent credit.

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/842-20/tableOfContent + Details
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