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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 10.6 | $ 5.2 | $ 4.6 | $ 13.8
Laclede Gas |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 4.0 | 2.1 | 1.3 | 1.7
Alagasco |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.1 | $ 7.2
Quoted Prices in Active Markets (Level 1) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 10.6 | 5.2 | 4.6 |
Short-term debt | 0.0 | 0.0 | 0.0 |
Long-term debt, including current portion | 0.0 | 0.0 | 0.0 |
Quoted Prices in Active Markets (Level 1) | Laclede Gas |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 4.0 | 2.1 | 1.3 |
Short-term debt | 0.0 | 0.0 | 0.0 |
Long-term debt, including current portion | 0.0 | 0.0 | 0.0 |
Quoted Prices in Active Markets (Level 1) | Alagasco |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.1 |
Short-term debt | 0.0 | 0.0 | 0.0 |
Long-term debt, including current portion | 0.0 | 0.0 | 0.0 |
Significant Observable Inputs (Level 2) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 |
Short-term debt | 506.4 | 398.7 | 377.1 |
Long-term debt, including current portion | 2,258.1 | 2,257.1 | 1,916.5 |
Significant Observable Inputs (Level 2) | Laclede Gas |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 |
Short-term debt | 312.9 | 243.7 | 274.1 |
Long-term debt, including current portion | 910.7 | 900.4 | 858.5 |
Significant Observable Inputs (Level 2) | Alagasco |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 |
Short-term debt | 102.5 | 82.0 | 43.0 |
Long-term debt, including current portion | 269.3 | 275.5 | 256.5 |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 |
Short-term debt | 0.0 | 0.0 | 0.0 |
Long-term debt, including current portion | 0.0 | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Laclede Gas |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 |
Short-term debt | 0.0 | 0.0 | 0.0 |
Long-term debt, including current portion | 0.0 | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Alagasco |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 |
Short-term debt | 0.0 | 0.0 | 0.0 |
Long-term debt, including current portion | 0.0 | 0.0 | 0.0 |
Carrying Amount |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 10.6 | 5.2 | 4.6 |
Short-term debt | 506.4 | 398.7 | 377.1 |
Long-term debt, including current portion | 2,071.3 | 2,070.7 | 1,838.9 |
Carrying Amount | Laclede Gas |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 4.0 | 2.1 | 1.3 |
Short-term debt | 312.9 | 243.7 | 274.1 |
Long-term debt, including current portion | 804.3 | 804.1 | 803.6 |
Carrying Amount | Alagasco |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.1 |
Short-term debt | 102.5 | 82.0 | 43.0 |
Long-term debt, including current portion | 247.7 | 247.6 | 247.6 |
Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 10.6 | 5.2 | 4.6 |
Short-term debt | 506.4 | 398.7 | 377.1 |
Long-term debt, including current portion | 2,258.1 | 2,257.1 | 1,916.5 |
Fair Value | Laclede Gas |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 4.0 | 2.1 | 1.3 |
Short-term debt | 312.9 | 243.7 | 274.1 |
Long-term debt, including current portion | 910.7 | 900.4 | 858.5 |
Fair Value | Alagasco |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.1 |
Short-term debt | 102.5 | 82.0 | 43.0 |
Long-term debt, including current portion | $ 269.3 | $ 275.5 | $ 256.5 |

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