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Leases (Tables) | 12 Months Ended
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Sep. 30, 2020
Leases [Abstract] |
Operating Lease Cost Cash Flow and Noncash Information | Operating lease cost, cash flow and noncash information for the year ended September 30, 2020, are shown in the following table.
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
Operating lease cost, including amounts capitalized |  | $ | 8.7 |  |  | $ | 0.5 |  |  | $ | 3.5 |
Cash flow and noncash information about operating leases: |  |  |  |  |  |  |  |  |  |  |  |
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities |  |  | 8.5 |  |  |  | 0.5 |  |  |  | 3.3 |
Right-of-use assets obtained in exchange for lease liabilities |  |  | 71.1 |  |  |  | 2.1 |  |  |  | 10.0 |
Summary of Balance Sheet and Weighted-Average Information about Operating Leases | The following table shows balance sheet and weighted-average information about operating leases as of September 30, 2020.
| Balance sheet classification |  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
Right-of-use assets | Deferred Charges and Other Assets: Other |  | $ | 65.1 |  |  | $ | 1.7 |  |  | $ | 6.7 |
Lease liabilities, current | Current Liabilities, Other |  |  | 6.5 |  |  |  | 0.3 |  |  |  | 1.9 |
Lease liabilities, noncurrent | Deferred Credits and Other Liabilities: Other |  |  | 58.4 |  |  |  | 1.4 |  |  |  | 4.7 |
Weighted-average remaining lease term |  |  | 15.9 years |  |  | 5.3 years |  |  | 3.3 years |
Weighted-average discount rate |  |  |  | 4.2 | % |  |  | 2.5 | % |  |  | 2.2 | %
Schedule of Maturity Analysis for Operating Lease Liabilities | Following is a maturity analysis by fiscal year for operating lease liabilities as of September 30, 2020.
|  |  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
2021 |  | $ | 6.6 |  |  | $ | 0.3 |  |  | $ | 1.9 |
2022 |  |  | 7.2 |  |  |  | 0.4 |  |  |  | 2.1 |
2023 |  |  | 7.2 |  |  |  | 0.3 |  |  |  | 2.1 |
2024 |  |  | 5.8 |  |  |  | 0.3 |  |  |  | 0.7 |
2025 |  |  | 5.1 |  |  |  | 0.3 |  |  |  | — |
Thereafter |  |  | 58.4 |  |  |  | 0.2 |  |  |  | — |
Total undiscounted lease payments |  |  | 90.3 |  |  |  | 1.8 |  |  |  | 6.8 |
Less present value discount |  |  | (25.4 | ) |  |  | (0.1 | ) |  |  | (0.2 | )
Total current and noncurrent lease liabilities |  | $ | 64.9 |  |  | $ | 1.7 |  |  | $ | 6.6 |
Schedule of Annual Minimum Rental Commitments for Operating Leases | The aggregate rental expense for fiscal years 2018 and 2019 and the annual minimum rental commitments for all leases having an initial or remaining non-cancelable term of more than one year as of September 30, 2019, were as follows (under ASC 840).
|  | Aggregate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Rental Expense |  |  | Minimum Rental Commitments as of September 30, 2019 |
|  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | Later |  |  | Total |
Spire |  | $ | 10.0 |  |  | $ | 10.9 |  |  | $ | 8.2 |  |  | $ | 7.0 |  |  | $ | 6.8 |  |  | $ | 6.1 |  |  | $ | 4.8 |  |  | $ | 36.5 |  |  | $ | 69.4 |
Spire Missouri |  |  | 3.6 |  |  |  | 3.7 |  |  |  | 0.5 |  |  |  | 0.2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.7 |
Spire Alabama |  |  | 4.7 |  |  |  | 5.2 |  |  |  | 2.9 |  |  |  | 2.1 |  |  |  | 2.1 |  |  |  | 2.1 |  |  |  | 0.7 |  |  |  | — |  |  |  | 9.9 |

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=121580752&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41499-112717 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41502-112717 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121549808&loc=d3e36991-112694 + Details
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