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v3.23.1

Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule Of Capital Expenditure Excluded From Statement Of Cash Flow [Table Text Block] |
September 30 |  | 2022 |  |  | 2021 |  |  | 2020 |
Spire |  | $ | 77.8 |  |  | $ | 59.5 |  |  | $ | 67.6 |
Spire Missouri |  |  | 45.6 |  |  |  | 37.1 |  |  |  | 34.3 |
Spire Alabama |  |  | 19.2 |  |  |  | 13.6 |  |  |  | 17.0 |
Schedule of Asset Retirement Obligations [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Asset retirement obligations, beginning of year |  | $ | 519.6 |  |  | $ | 540.1 |  |  | $ | 143.4 |  |  | $ | 153.4 |  |  | $ | 362.8 |  |  | $ | 374.3 |
Liabilities incurred during the period |  |  | 3.2 |  |  |  | 11.1 |  |  |  | 1.2 |  |  |  | 1.4 |  |  |  | 0.5 |  |  |  | 7.4 |
Liabilities settled during the period |  |  | (9.2 | ) |  |  | (21.9 | ) |  |  | (4.1 | ) |  |  | (9.7 | ) |  |  | (2.0 | ) |  |  | (10.7 | )
Accretion |  |  | 21.1 |  |  |  | 21.8 |  |  |  | 5.9 |  |  |  | 6.2 |  |  |  | 14.7 |  |  |  | 15.0 |
Revisions in estimated cash flows |  |  | (13.8 | ) |  |  | (31.5 | ) |  |  | (35.8 | ) |  |  | (7.9 | ) |  |  | 22.7 |  |  |  | (23.2 | )
Asset retirement obligations, end of year |  | $ | 520.9 |  |  | $ | 519.6 |  |  | $ | 110.6 |  |  | $ | 143.4 |  |  | $ | 398.7 |  |  | $ | 362.8 |
Schedule of Related Party Transactions [Table Text Block] |
|  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Natural gas purchases from Spire Marketing |  | $ | 86.3 |  |  | $ | 92.5 |  |  | $ | 56.9 |  |  | $ | 3.2 |  |  | $ | 10.4 |  |  | $ | 6.3 |
Natural gas sales to Spire Marketing |  |  | — |  |  |  | 1.1 |  |  |  | 0.1 |  |  |  | 0.5 |  |  |  | 0.1 |  |  |  | 0.3 |
Transportation services from Spire STL Pipeline LLC |  |  | 32.0 |  |  |  | 32.0 |  |  |  | 27.9 |  |  |  | — |  |  |  | — |  |  |  | — |
Transportation services from Spire NGL Inc. |  |  | — |  |  |  | 0.5 |  |  |  | 1.0 |  |  |  | — |  |  |  | — |  |  |  | — |
Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Allowance at beginning of year |  | $ | 30.3 |  |  | $ | 24.9 |  |  | $ | 23.0 |  |  | $ | 22.6 |  |  | $ | 18.1 |  |  | $ | 14.9 |  |  | $ | 6.6 |  |  | $ | 5.5 |  |  | $ | 6.3 |
Provision for expected credit losses |  |  | 11.6 |  |  |  | 14.7 |  |  |  | 14.0 |  |  |  | 11.2 |  |  |  | 11.1 |  |  |  | 12.7 |  |  |  | 0.3 |  |  |  | 3.1 |  |  |  | 0.9 |
Write-offs, net of recoveries |  |  | (10.0 | ) |  |  | (9.3 | ) |  |  | (12.1 | ) |  |  | (8.9 | ) |  |  | (6.6 | ) |  |  | (9.5 | ) |  |  | (0.6 | ) |  |  | (2.0 | ) |  |  | (1.7 | )
Allowance at end of year |  | $ | 31.9 |  |  | $ | 30.3 |  |  | $ | 24.9 |  |  | $ | 24.9 |  |  | $ | 22.6 |  |  | $ | 18.1 |  |  | $ | 6.3 |  |  | $ | 6.6 |  |  | $ | 5.5 |

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