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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 3 Months Ended
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Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Fair value of financial instruments | The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis for the Company are as follows:
|  |  |  |  | Classification of Estimated Fair Value
| Carrying Amount |  | Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 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 September 30, 2016 |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 5.2 |  |  | $ | 5.2 |  |  | $ | 5.2 |  |  | $ | — |  |  | $ | — |
Short-term debt | 398.7 |  |  | 398.7 |  |  | — |  |  | 398.7 |  |  | — |
Long-term debt, including current portion | 2,070.7 |  |  | 2,257.1 |  |  | — |  |  | 2,257.1 |  |  | — |
As of December 31, 2015 |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 4.6 |  |  | $ | 4.6 |  |  | $ | 4.6 |  |  | $ | — |  |  | $ | — |
Short-term debt | 377.1 |  |  | 377.1 |  |  | — |  |  | 377.1 |  |  | — |
Long-term debt | 1,838.9 |  |  | 1,916.5 |  |  | — |  |  | 1,916.5 |  |  | — |
Laclede Gas |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Fair value of financial instruments | The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis for Laclede Gas are as follows:
|  |  |  |  | Classification of Estimated Fair Value
| Carrying Amount |  | Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
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 |  |  | — |
As of September 30, 2016 |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 2.1 |  |  | $ | 2.1 |  |  | $ | 2.1 |  |  | $ | — |  |  | $ | — |
Short-term debt | 243.7 |  |  | 243.7 |  |  | — |  |  | 243.7 |  |  | — |
Long-term debt | 804.1 |  |  | 900.4 |  |  | — |  |  | 900.4 |  |  | — |
As of December 31, 2015 |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 1.3 |  |  | $ | 1.3 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | — |
Short-term debt | 274.1 |  |  | 274.1 |  |  | — |  |  | 274.1 |  |  | — |
Long-term debt | 803.6 |  |  | 858.5 |  |  | — |  |  | 858.5 |  |  | — |
Alagasco |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Fair value of financial instruments | The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis for Alagasco are as follows:
|  |  |  |  | Classification of Estimated Fair Value
| Carrying Amount |  | Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
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 September 30, 2016 |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Short-term debt | 82.0 |  |  | 82.0 |  |  | — |  |  | 82.0 |  |  | — |
Long-term debt | 247.6 |  |  | 275.5 |  |  | — |  |  | 275.5 |  |  | — |
As of December 31, 2015 |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | — |
Short-term debt | 43.0 |  |  | 43.0 |  |  | — |  |  | 43.0 |  |  | — |
Long-term debt | 247.6 |  |  | 256.5 |  |  | — |  |  | 256.5 |  |  | — |

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