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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2020
Fair Value Disclosures [Abstract] |
Summary of Financial Instruments Measured at Fair Value on Recurring Basis | The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis were as follows:
|  |  |  |  |  |  |  |  |  | Classification of Estimated Fair Value |
|  | Carrying Amount |  |  | Fair Value |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Observable Inputs (Level 2) |
Spire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 4.1 |  |  | $ | 4.1 |  |  | $ | 4.1 |  |  | $ | — |
Notes payable |  |  | 648.0 |  |  |  | 648.0 |  |  |  | — |  |  |  | 648.0 |
Long-term debt, including current portion |  |  | 2,484.1 |  |  |  | 2,908.6 |  |  |  | — |  |  |  | 2,908.6 |
As of September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 5.8 |  |  | $ | 5.8 |  |  | $ | 5.8 |  |  | $ | — |
Notes payable |  |  | 743.2 |  |  |  | 743.2 |  |  |  | — |  |  |  | 743.2 |
Long-term debt, including current portion |  |  | 2,122.6 |  |  |  | 2,373.4 |  |  |  | — |  |  |  | 2,373.4 |
Spire Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable - associated companies |  | $ | 301.2 |  |  | $ | 301.2 |  |  | $ | — |  |  | $ | 301.2 |
Long-term debt |  |  | 1,092.0 |  |  |  | 1,313.5 |  |  |  | — |  |  |  | 1,313.5 |
As of September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 2.6 |  |  | $ | 2.6 |  |  | $ | 2.6 |  |  | $ | — |
Notes payable - associated companies |  |  | 386.4 |  |  |  | 386.4 |  |  |  | — |  |  |  | 386.4 |
Long-term debt |  |  | 925.0 |  |  |  | 1,065.2 |  |  |  | — |  |  |  | 1,065.2 |
Spire Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable - associated companies |  | $ | 121.3 |  |  | $ | 121.3 |  |  | $ | — |  |  | $ | 121.3 |
Long-term debt, including current portion |  |  | 471.8 |  |  |  | 576.9 |  |  |  | — |  |  |  | 576.9 |
As of September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable - associated companies |  | $ | 128.7 |  |  | $ | 128.7 |  |  | $ | — |  |  | $ | 128.7 |
Long-term debt, including current portion |  |  | 412.2 |  |  |  | 474.8 |  |  |  | — |  |  |  | 474.8 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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