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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 3 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of Fair value of financial instruments |
|  |  |  |  | Classification of Estimated Fair Value
| Carrying Amount |  | Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Observable Inputs (Level 2)
Spire
As of December 31, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 6.7 |  |  | $ | 6.7 |  |  | $ | 6.7 |  |  | $ | — |
Short-term debt | 583.6 |  |  | 583.6 |  |  | — |  |  | 583.6 |
Long-term debt, including current portion | 2,135.5 |  |  | 2,280.1 |  |  | — |  |  | 2,280.1 |
As of September 30, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 7.4 |  |  | $ | 7.4 |  |  | $ | 7.4 |  |  | $ | — |
Short-term debt | 477.3 |  |  | 477.3 |  |  | — |  |  | 477.3 |
Long-term debt, including current portion | 2,095.0 |  |  | 2,210.3 |  |  | — |  |  | 2,210.3 |
As of December 31, 2016 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 10.6 |  |  | $ | 10.6 |  |  | $ | 10.6 |  |  | $ | — |
Short-term debt | 506.4 |  |  | 506.4 |  |  | — |  |  | 506.4 |
Long-term debt, including current portion | 2,071.3 |  |  | 2,258.1 |  |  | — |  |  | 2,258.1 |
As of December 31, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Short-term debt | 163.1 |  |  | 163.1 |  |  | — |  |  | 163.1 |
Long-term debt | 277.8 |  |  | 303.5 |  |  | — |  |  | 303.5 |
As of September 30, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |
Short-term debt | 169.9 |  |  | 169.9 |  |  | — |  |  | 169.9 |
Long-term debt | 247.8 |  |  | 269.4 |  |  | — |  |  | 269.4 |
As of December 31, 2016 |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Short-term debt | 102.5 |  |  | 102.5 |  |  | — |  |  | 102.5 |
Long-term debt | 247.7 |  |  | 269.3 |  |  | — |  |  | 269.3 |
As of December 31, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 4.1 |  |  | $ | 4.1 |  |  | $ | 4.1 |  |  | $ | — |
Short-term debt | 275.6 |  |  | 275.6 |  |  | — |  |  | 275.6 |
Long-term debt, including current portion | 974.1 |  |  | 1,068.6 |  |  | — |  |  | 1,068.6 |
As of September 30, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 2.5 |  |  | $ | 2.5 |  |  | $ | 2.5 |  |  | $ | — |
Short-term debt | 203.0 |  |  | 203.0 |  |  | — |  |  | 203.0 |
Long-term debt, including current portion | 973.9 |  |  | 1,056.9 |  |  | — |  |  | 1,056.9 |
As of December 31, 2016 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 4.0 |  |  | $ | 4.0 |  |  | $ | 4.0 |  |  | $ | — |
Short-term debt | 312.9 |  |  | 312.9 |  |  | — |  |  | 312.9 |
Long-term debt | 804.3 |  |  | 910.7 |  |  | — |  |  | 910.7 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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