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v3.25.3

Segment Information (Tables) | 12 Months Ended
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Sep. 30, 2025
Segment Reporting Information [Line Items] |
Schedule of Information about Segment Revenue, Segment Expenses and Adjusted Earnings | The following tables present information about Spire’s segment revenue, segment expenses, and Adjusted Earnings.
2025 |  | Gas Utility |  |  | Gas Marketing |  |  | Midstream |  |  | Total Reportable Segments |  |  | Other(b) |  |  | Intersegment Eliminations |  |  | Consolidated |
Revenues from external customers |  | $ | 2,207.5 |  |  | $ | 157.2 |  |  | $ | 109.2 |  |  | $ | 2,473.9 |  |  | $ | 2.5 |  |  | $ | — |  |  | $ | 2,476.4 |
Intersegment revenues |  |  | 0.1 |  |  |  | - |  |  |  | 46.3 |  |  |  | 46.4 |  |  |  | — |  |  |  | (46.4 | ) |  |  | - |
Total Operating Revenues |  |  | 2,207.6 |  |  |  | 157.2 |  |  |  | 155.5 |  |  |  | 2,520.3 |  |  |  | 2.5 |  |  |  | (46.4 | ) |  |  | 2,476.4 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant segment expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of gas sold, incl. gross receipts taxes |  |  | 970.9 |  |  |  | 93.7 |  |  |  | 3.0 |  |  |  | 1,067.6 |  |  |  | — |  |  |  | (46.4 | ) |  |  | 1,021.2 |
Operation and maintenance expense |  |  | 467.1 |  |  |  | 19.4 |  |  |  | 45.3 |  |  |  | 531.8 |  |  |  | 10.3 |  |  |  | — |  |  |  | 542.1 |
Depreciation and amortization expense |  |  | 277.6 |  |  |  | 1.0 |  |  |  | 19.2 |  |  |  | 297.8 |  |  |  | 0.4 |  |  |  | — |  |  |  | 298.2 |
Interest expense |  |  | 137.1 |  |  |  | — |  |  |  | 11.6 |  |  |  | 148.7 |  |  |  | 55.4 |  |  |  | — |  |  |  | 204.1 |
Income tax expense (benefit) |  |  | 47.4 |  |  |  | 11.1 |  |  |  | 15.7 |  |  |  | 74.2 |  |  |  | (14.5 | ) |  |  | — |  |  |  | 59.7 |
Other segment items (a) |  |  | 76.1 |  |  |  | 6.1 |  |  |  | 4.4 |  |  |  | 86.6 |  |  |  | (11.0 | ) |  |  | — |  |  |  | 75.6 |
Adjusted earnings (loss) [Non-GAAP] |  | $ | 231.4 |  |  | $ | 25.9 |  |  | $ | 56.3 |  |  | $ | 313.6 |  |  | $ | (38.1 | ) |  | $ | - |  |  | $ | 275.5 |
Capital expenditures |  |  | 816.8 |  |  |  | 0.1 |  |  |  | 106.8 |  |  |  | 923.7 |  |  |  | (1.3 | ) |  |  | — |  |  |  | 922.4 |
2024 |  | Gas Utility |  |  | Gas Marketing |  |  | Midstream |  |  | Total Reportable Segments |  |  | Other(b) |  |  | Intersegment Eliminations |  |  | Consolidated |
Revenues from external customers |  | $ | 2,436.2 |  |  | $ | 99.2 |  |  | $ | 56.9 |  |  | $ | 2,592.3 |  |  | $ | 0.7 |  |  | $ | — |  |  | $ | 2,593.0 |
Intersegment revenues |  |  | 1.7 |  |  |  | — |  |  |  | 43.8 |  |  |  | 45.5 |  |  |  | - |  |  |  | (45.5 | ) |  |  | - |
Total Operating Revenues |  |  | 2,437.9 |  |  |  | 99.2 |  |  |  | 100.7 |  |  |  | 2,637.8 |  |  |  | 0.7 |  |  |  | (45.5 | ) |  |  | 2,593.0 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant segment expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of gas sold, incl. gross receipts taxes |  |  | 1,238.7 |  |  |  | 37.1 |  |  |  | 1.1 |  |  |  | 1,276.9 |  |  |  | 0.1 |  |  |  | (45.5 | ) |  |  | 1,231.5 |
Operation and maintenance expense |  |  | 452.8 |  |  |  | 18.2 |  |  |  | 34.7 |  |  |  | 505.7 |  |  |  | 1.7 |  |  |  | — |  |  |  | 507.4 |
Depreciation and amortization expense |  |  | 263.6 |  |  |  | 1.5 |  |  |  | 12.8 |  |  |  | 277.9 |  |  |  | 0.5 |  |  |  | — |  |  |  | 278.4 |
Interest expense |  |  | 147.3 |  |  |  | — |  |  |  | 7.0 |  |  |  | 154.3 |  |  |  | 46.8 |  |  |  | — |  |  |  | 201.1 |
Income tax expense (benefit) |  |  | 48.0 |  |  |  | 10.8 |  |  |  | 9.6 |  |  |  | 68.4 |  |  |  | (9.7 | ) |  |  | — |  |  |  | 58.7 |
Other segment items (a) |  |  | 66.7 |  |  |  | 8.2 |  |  |  | 2.0 |  |  |  | 76.9 |  |  |  | (8.4 | ) |  |  | — |  |  |  | 68.5 |
Adjusted earnings (loss) [Non-GAAP] |  | $ | 220.8 |  |  | $ | 23.4 |  |  | $ | 33.5 |  |  | $ | 277.7 |  |  | $ | (30.3 | ) |  | $ | - |  |  | $ | 247.4 |
Capital expenditures |  |  | 691.1 |  |  |  | 0.1 |  |  |  | 171.3 |  |  |  | 862.5 |  |  |  | (1.2 | ) |  |  | — |  |  |  | 861.3 |
2023 |  | Gas Utility |  |  | Gas Marketing |  |  | Midstream |  |  | Total Reportable Segments |  |  | Other(b) |  |  | Intersegment Eliminations |  |  | Consolidated |
Revenues from external customers |  | $ | 2,456.6 |  |  | $ | 179.1 |  |  | $ | 29.9 |  |  | $ | 2,665.6 |  |  | $ | 0.7 |  |  | $ | — |  |  | $ | 2,666.3 |
Intersegment revenues |  |  | 0.3 |  |  |  | — |  |  |  | 36.2 |  |  |  | 36.5 |  |  |  | — |  |  |  | (36.5 | ) |  |  | - |
Total Operating Revenues |  |  | 2,456.9 |  |  |  | 179.1 |  |  |  | 66.1 |  |  |  | 2,702.1 |  |  |  | 0.7 |  |  |  | (36.5 | ) |  |  | 2,666.3 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant segment expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of gas sold, incl. gross receipts taxes |  |  | 1,321.1 |  |  |  | 108.0 |  |  |  | — |  |  |  | 1,429.1 |  |  |  | — |  |  |  | (36.5 | ) |  |  | 1,392.6 |
Operation and maintenance expense |  |  | 461.8 |  |  |  | 19.4 |  |  |  | 30.5 |  |  |  | 511.7 |  |  |  | 5.9 |  |  |  | — |  |  |  | 517.6 |
Depreciation and amortization expense |  |  | 244.4 |  |  |  | 1.5 |  |  |  | 8.4 |  |  |  | 254.3 |  |  |  | 0.5 |  |  |  | — |  |  |  | 254.8 |
Interest expense |  |  | 139.9 |  |  |  | — |  |  |  | 8.6 |  |  |  | 148.5 |  |  |  | 37.2 |  |  |  | — |  |  |  | 185.7 |
Income tax expense (benefit) |  |  | 32.7 |  |  |  | 12.8 |  |  |  | 3.8 |  |  |  | 49.3 |  |  |  | (10.5 | ) |  |  | — |  |  |  | 38.8 |
Other segment items (a) |  |  | 56.5 |  |  |  | (10.2 | ) |  |  | 0.7 |  |  |  | 47.0 |  |  |  | 1.7 |  |  |  | — |  |  |  | 48.7 |
Adjusted earnings (loss) |  | $ | 200.5 |  |  | $ | 47.6 |  |  | $ | 14.1 |  |  | $ | 262.2 |  |  | $ | (34.1 | ) |  | — |  |  | $ | 228.1 |
Capital expenditures |  |  | 588.6 |  |  |  | 0.4 |  |  |  | 73.6 |  |  |  | 662.6 |  |  |  | (0.1 | ) |  |  | — |  |  |  | 662.5 |
(a) Other segment items for each reportable segment include fair value and timing adjustments, acquisition and restructuring activities, taxes other than income and gross receipt taxes, and miscellaneous income and deductions. (b) All other components of the Company's consolidated information include Spire's subsidiaries engaged in the operation of a propane pipeline and risk management, among other activities, and unallocated corporate items, including certain debt and associated interest costs.
Reconciliation Of Consolidated Net Economic Earnings To Consolidated Net Income |
Reconciliation of Consolidated Net Income to Consolidated Adjusted Earnings |  | 2025 |  |  | 2024 |  |  | 2023 |
Net Income |  | $ | 271.7 |  |  | $ | 250.9 |  |  | $ | 217.5 |
Adjustments, pre-tax: |  |  |  |  |  |  |  |  |
Fair value and timing adjustments |  |  | (10.4 | ) |  |  | (12.4 | ) |  |  | 11.4 |
Acquisition and restructuring activities |  |  | 15.2 |  |  |  | 7.6 |  |  |  | 2.5 |
Income tax adjustments |  |  | (1.0 | ) |  |  | 1.3 |  |  |  | (3.3 | )
Adjusted Earnings |  | $ | 275.5 |  |  | $ | 247.4 |  |  | $ | 228.1 |
Spire Missouri [Member] |
Segment Reporting Information [Line Items] |
Schedule of Financial Data Related to Gross Receipt Taxes and Capital Expenditures | Financial data related to gross receipt taxes and capital expenditures are as follows:
|  | 2025 |  |  | 2024 |  |  | 2023 |
Gross Receipt Taxes |  | $ | 82.9 |  |  | $ | 93.1 |  |  | $ | 96.7 |
Capital Expenditures |  |  | 641.2 |  |  |  | 553.0 |  |  |  | 447.5 |
Spire Alabama Inc [Member] |
Segment Reporting Information [Line Items] |
Schedule of Financial Data Related to Gross Receipt Taxes and Capital Expenditures | Financial data related to gross receipt taxes and capital expenditures are as follows:
|  | 2025 |  |  | 2024 |  |  | 2023 |
Gross Receipt Taxes |  |  | 27.9 |  |  |  | 30.1 |  |  |  | 29.9 |
Capital Expenditures |  |  | 144.2 |  |  |  | 112.8 |  |  |  | 117.6 |

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