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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2020
Accounting Policies [Abstract] |
Schedule of Capital Expenditures Excluded from Statement of Cash Flow | Accrued capital expenditures, shown in the following table, are excluded from capital expenditures in the statements of cash flows until paid.
September 30 |  | 2020 |  |  | 2019 |  |  | 2018 |
Spire |  | $ | 67.6 |  |  | $ | 80.6 |  |  | $ | 62.1 |
Spire Missouri |  |  | 34.3 |  |  |  | 40.1 |  |  |  | 36.7 |
Spire Alabama |  |  | 17.0 |  |  |  | 11.9 |  |  |  | 8.9 |
Asset Retirement Obligations | In fiscal 2020, Spire Alabama refined certain assumptions and estimates used in calculating its asset retirement obligations, resulting in both an increase in cost to retire gas distribution assets and a change in the timing of the related cash outflows. As a result of this change in estimate, which the Company believes is more precise, Spire Alabama recorded a $221.1 increase to its asset retirement obligations. Related adjustments were made to regulatory assets and utility plant, with no impact on earnings. The following table presents a reconciliation of the beginning and ending balances of asset retirement obligations at September 30, as reported in the balance sheets.
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Asset retirement obligations, beginning of year |  | $ | 337.6 |  |  | $ | 321.1 |  |  | $ | 173.5 |  |  | $ | 174.1 |  |  | $ | 148.7 |  |  | $ | 135.7 |
Liabilities incurred during the period |  |  | 3.0 |  |  |  | 10.8 |  |  |  | 2.6 |  |  |  | 1.6 |  |  |  | — |  |  |  | 8.8 |
Liabilities settled during the period |  |  | (6.9 | ) |  |  | (8.3 | ) |  |  | (4.0 | ) |  |  | (6.8 | ) |  |  | (1.6 | ) |  |  | (0.8 | )
Accretion |  |  | 14.0 |  |  |  | 13.0 |  |  |  | 7.2 |  |  |  | 7.4 |  |  |  | 6.1 |  |  |  | 5.0 |
Revisions in estimated cash flows |  |  | 192.4 |  |  |  | 1.0 |  |  |  | (25.9 | ) |  |  | (2.8 | ) |  |  | 221.1 |  |  |  | — |
Asset retirement obligations, end of year |  | $ | 540.1 |  |  | $ | 337.6 |  |  | $ | 153.4 |  |  | $ | 173.5 |  |  | $ | 374.3 |  |  | $ | 148.7 |
Schedule of Inter-Company Transactions | In addition, Spire Missouri’s other transactions with affiliates included:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Purchases of natural gas from Spire Marketing |  | $ | 56.9 |  |  | $ | 95.3 |  |  | $ | 71.5 |
Sales of natural gas to Spire Marketing |  |  | 0.1 |  |  |  | 1.7 |  |  |  | 0.3 |
Transportation services received from STL Pipeline LLC |  |  | 27.9 |  |  |  | — |  |  |  | — |
Transportation services received from Spire NGL Inc. |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 1.0 |
Schedule of Allowance for Doubtful Accounts |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2020 |  |  | 2019 |  |  | 2018 |
Allowance at beginning of year |  | $ | 23.0 |  |  | $ | 22.4 |  |  | $ | 18.3 |  |  | $ | 14.9 |  |  | $ | 16.0 |  |  | $ | 14.1 |  |  | $ | 6.3 |  |  | $ | 3.9 |  |  | $ | 2.6 |
Additions charged to expense |  |  | 14.0 |  |  |  | 16.9 |  |  |  | 14.6 |  |  |  | 12.7 |  |  |  | 12.3 |  |  |  | 11.9 |  |  |  | 0.9 |  |  |  | 4.7 |  |  |  | 2.1 |
Net deductions |  |  | (12.1 | ) |  |  | (16.3 | ) |  |  | (10.5 | ) |  |  | (9.5 | ) |  |  | (13.4 | ) |  |  | (10.0 | ) |  |  | (1.7 | ) |  |  | (2.3 | ) |  |  | (0.8 | )
Allowance at end of year |  | $ | 24.9 |  |  | $ | 23.0 |  |  | $ | 22.4 |  |  | $ | 18.1 |  |  | $ | 14.9 |  |  | $ | 16.0 |  |  | $ | 5.5 |  |  | $ | 6.3 |  |  | $ | 3.9 |

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