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v3.23.3

Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule Of Capital Expenditure Excluded From Statement Of Cash Flow [Table Text Block] |
September 30 |  | 2023 |  |  | 2022 |  |  | 2021 |
Spire |  | $ | 104.3 |  |  | $ | 77.8 |  |  | $ | 59.5 |
Spire Missouri |  |  | 56.5 |  |  |  | 45.6 |  |  |  | 37.1 |
Spire Alabama |  |  | 4.6 |  |  |  | 19.2 |  |  |  | 13.6 |
Schedule of Asset Retirement Obligations [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Asset retirement obligations, beginning of year |  | $ | 520.9 |  |  | $ | 519.6 |  |  | $ | 110.6 |  |  | $ | 143.4 |  |  | $ | 398.7 |  |  | $ | 362.8 |
Liabilities incurred during the period |  |  | 7.9 |  |  |  | 3.2 |  |  |  | 0.9 |  |  |  | 1.2 |  |  |  | 2.0 |  |  |  | 0.5 |
Liabilities settled during the period |  |  | (6.8 | ) |  |  | (9.2 | ) |  |  | (2.5 | ) |  |  | (4.1 | ) |  |  | (2.5 | ) |  |  | (2.0 | )
Accretion |  |  | 21.5 |  |  |  | 21.1 |  |  |  | 4.5 |  |  |  | 5.9 |  |  |  | 16.5 |  |  |  | 14.7 |
Revisions in estimated cash flows |  |  | 33.9 |  |  |  | (13.8 | ) |  |  | (2.4 | ) |  |  | (35.8 | ) |  |  | 36.3 |  |  |  | 22.7 |
Asset retirement obligations, end of year |  | $ | 577.4 |  |  | $ | 520.9 |  |  | $ | 111.1 |  |  | $ | 110.6 |  |  | $ | 451.0 |  |  | $ | 398.7 |
Schedule of Related Party Transactions [Table Text Block] |
|  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Natural gas purchases from Spire Marketing |  | $ | 57.4 |  |  | $ | 86.3 |  |  | $ | 92.5 |  |  | $ | 4.7 |  |  | $ | 3.2 |  |  | $ | 10.4 |
Natural gas sales to Spire Marketing |  |  | 0.4 |  |  |  | — |  |  |  | 1.1 |  |  |  | — |  |  |  | 0.5 |  |  |  | 0.1 |
Transportation services from Spire STL Pipeline LLC |  |  | 32.0 |  |  |  | 32.0 |  |  |  | 32.0 |  |  |  | — |  |  |  | — |  |  |  | — |
Natural gas storage services from Spire Storage Salt Plains LLC |  |  | 0.7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transportation services from Spire NGL Inc. |  |  | — |  |  |  | — |  |  |  | 0.5 |  |  |  | — |  |  |  | — |  |  |  | — |
Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Allowance at beginning of year |  | $ | 31.9 |  |  | $ | 30.3 |  |  | $ | 24.9 |  |  | $ | 24.9 |  |  | $ | 22.6 |  |  | $ | 18.1 |  |  | $ | 6.3 |  |  | $ | 6.6 |  |  | $ | 5.5 |
Provision for expected credit losses |  |  | 16.6 |  |  |  | 11.6 |  |  |  | 14.7 |  |  |  | 13.3 |  |  |  | 11.2 |  |  |  | 11.1 |  |  |  | 2.6 |  |  |  | 0.3 |  |  |  | 3.1 |
Write-offs, net of recoveries |  |  | (16.0 | ) |  |  | (10.0 | ) |  |  | (9.3 | ) |  |  | (12.0 | ) |  |  | (8.9 | ) |  |  | (6.6 | ) |  |  | (3.2 | ) |  |  | (0.6 | ) |  |  | (2.0 | )
Allowance at end of year |  | $ | 32.5 |  |  | $ | 31.9 |  |  | $ | 30.3 |  |  | $ | 26.2 |  |  | $ | 24.9 |  |  | $ | 22.6 |  |  | $ | 5.7 |  |  | $ | 6.3 |  |  | $ | 6.6 |

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