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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Mar. 31, 2021
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 are shown in the following tables, classified according to the fair value hierarchy. There were no such instruments classified as Level 3 (significant unobservable inputs) as of March 31, 2021, September 30, 2020, and March 31, 2020.
|  |  |  |  |  |  |  |  |  | Classification of Estimated Fair Value |
|  | Carrying Amount |  |  | Fair Value |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Observable Inputs (Level 2) |
Spire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 104.0 |  |  | $ | 104.0 |  |  | $ | 104.0 |  |  | $ | — |
Notes payable |  |  | 653.5 |  |  |  | 653.5 |  |  |  | — |  |  |  | 653.5 |
Long-term debt, including current portion |  |  | 2,803.3 |  |  |  | 3,090.9 |  |  |  | — |  |  |  | 3,090.9 |
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 March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 108.4 |  |  | $ | 108.4 |  |  | $ | 108.4 |  |  | $ | — |
Notes payable |  |  | 560.6 |  |  |  | 560.6 |  |  |  | — |  |  |  | 560.6 |
Long-term debt, including current portion |  |  | 2,490.2 |  |  |  | 2,671.0 |  |  |  | — |  |  |  | 2,671.0 |
Spire Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  | $ | 250.0 |  |  | $ | 250.0 |  |  | $ | — |  |  | $ | 250.0 |
Notes payable – associated companies |  |  | 369.4 |  |  |  | 369.4 |  |  |  | — |  |  |  | 369.4 |
Long-term debt |  |  | 1,092.4 |  |  |  | 1,254.2 |  |  |  | — |  |  |  | 1,254.2 |
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 March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 5.1 |  |  | $ | 5.1 |  |  | $ | 5.1 |  |  | $ | — |
Notes payable |  |  | 185.1 |  |  |  | 185.1 |  |  |  | — |  |  |  | 185.1 |
Notes payable – associated companies |  |  | 39.6 |  |  |  | 39.6 |  |  |  | — |  |  |  | 39.6 |
Long-term debt |  |  | 1,098.7 |  |  |  | 1,231.2 |  |  |  | — |  |  |  | 1,231.2 |
Spire Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 18.2 |  |  | $ | 18.2 |  |  | $ | 18.2 |  |  | $ | — |
Notes receivable – associated companies |  |  | 20.0 |  |  |  | 20.0 |  |  |  | — |  |  |  | 20.0 |
Long-term debt, including current portion |  |  | 621.1 |  |  |  | 682.3 |  |  |  | — |  |  |  | 682.3 |
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 March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |
Notes payable |  |  | 50.0 |  |  |  | 50.0 |  |  |  | — |  |  |  | 50.0 |
Notes payable – associated companies |  |  | 33.0 |  |  |  | 33.0 |  |  |  | — |  |  |  | 33.0 |
Long-term debt |  |  | 471.7 |  |  |  | 535.1 |  |  |  | — |  |  |  | 535.1 |

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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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