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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Fair Value of Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | $ 7.7 | [1] | $ 6.3 | [1]
Fair value of liability derivatives presented above | 12.0 | [1] | 10.6 | [1]
Gas Utility | Not Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 2.5 | [1] | 1.7 | [1]
Fair value of liability derivatives presented above | 9.3 | [1] | 8.9 | [1]
Gas Utility | Gasoline and heating oil contracts | Designated as Hedging Instrument | Accounts Receivable – Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 | [1] | 0.1 | [1]
Fair value of liability derivatives presented above | 0.2 | [1] | 0 | [1]
Gas Utility | Gasoline and heating oil contracts | Not Designated as Hedging Instrument | Accounts Receivable – Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 | [1] |  |
Fair value of liability derivatives presented above | 0.4 | [1] |  |
Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Accounts Receivable – Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 2.4 | [1] | 1.5 | [1]
Fair value of liability derivatives presented above | 5.2 | [1] | 3.5 | [1]
Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Prepayments and other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 | [1] | 0 | [1]
Fair value of liability derivatives presented above | 0 | [1] | 0 | [1]
Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Derivative Asset Instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0.1 | [1] |  |
Fair value of liability derivatives presented above | 3.7 | [1] |  |
Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Deferred Charges - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above |  |  | 0 | [1]
Fair value of liability derivatives presented above |  |  | 0 | [1]
Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Current Liabilities - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above |  |  | 0.2 | [1]
Fair value of liability derivatives presented above |  |  | 4.0 | [1]
Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Deferred Credits and Other Liabilities - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above |  |  | 0 | [1]
Fair value of liability derivatives presented above |  |  | 1.4 | [1]
Gas Marketing | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 1.4 | [1] | 2.3 | [1]
Fair value of liability derivatives presented above | 0.8 | [1] | 0.5 | [1]
Gas Marketing | Not Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 3.8 | [1] | 2.3 | [1]
Fair value of liability derivatives presented above | 1.9 | [1] | 1.2 | [1]
Gas Marketing | Natural gas contracts | Designated as Hedging Instrument | Prepayments and other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 | [1] | 2.2 | [1]
Fair value of liability derivatives presented above | 0 | [1] | 0.5 | [1]
Gas Marketing | Natural gas contracts | Designated as Hedging Instrument | Derivative Asset Instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0.7 | [1] |  |
Fair value of liability derivatives presented above | 0.4 | [1] |  |
Gas Marketing | Natural gas contracts | Designated as Hedging Instrument | Deferred Charges - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0.7 | [1] | 0 | [1]
Fair value of liability derivatives presented above | 0.2 | [1] | 0 | [1]
Gas Marketing | Natural gas contracts | Not Designated as Hedging Instrument | Accounts Receivable – Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above |  |  | 0 | [1]
Fair value of liability derivatives presented above |  |  | 0 | [1]
Gas Marketing | Natural gas contracts | Not Designated as Hedging Instrument | Prepayments and other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 | [1] | 1.9 | [1]
Fair value of liability derivatives presented above | 0 | [1] | 0.2 | [1]
Gas Marketing | Natural gas contracts | Not Designated as Hedging Instrument | Derivative Asset Instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 3.5 | [1] |  |
Fair value of liability derivatives presented above | 1.4 | [1] |  |
Gas Marketing | Natural gas contracts | Not Designated as Hedging Instrument | Deferred Charges - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0.3 | [1] | 0.1 | [1]
Fair value of liability derivatives presented above | 0 | [1] | 0.1 | [1]
Gas Marketing | Natural gas contracts | Not Designated as Hedging Instrument | Current Liabilities - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 | [1] | 0.3 | [1]
Fair value of liability derivatives presented above | 0.5 | [1] | 0.8 | [1]
Gas Marketing | Natural gas contracts | Not Designated as Hedging Instrument | Deferred Credits and Other Liabilities - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 | [1] | 0 | [1]
Fair value of liability derivatives presented above | 0 | [1] | 0.1 | [1]
Laclede Gas |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 2.5 |  | 1.8 |
Fair value of liability derivatives presented above | 9.5 |  | 8.9 |
Laclede Gas | Gas Utility |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 2.5 |  | 1.8 |
Fair value of liability derivatives presented above | 9.5 |  | 8.9 |
Laclede Gas | Gas Utility | Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 |  | 0.1 |
Fair value of liability derivatives presented above | 0.2 |  | 0 |
Laclede Gas | Gas Utility | Not Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 2.5 |  | 1.7 |
Fair value of liability derivatives presented above | 9.3 |  | 8.9 |
Laclede Gas | Gas Utility | Gasoline and heating oil contracts | Designated as Hedging Instrument | Accounts Receivable – Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 |  | 0.1 |
Fair value of liability derivatives presented above | 0.2 |  | 0 |
Laclede Gas | Gas Utility | Gasoline and heating oil contracts | Not Designated as Hedging Instrument | Accounts Receivable – Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 |  |  |
Fair value of liability derivatives presented above | 0.4 |  |  |
Laclede Gas | Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Accounts Receivable – Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 2.4 |  | 1.5 |
Fair value of liability derivatives presented above | 5.2 |  | 3.5 |
Laclede Gas | Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Prepayments and other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 |  | 0 |
Fair value of liability derivatives presented above | 0 |  | 0 |
Laclede Gas | Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Derivative Asset Instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0.1 |  |  |
Fair value of liability derivatives presented above | 3.7 |  |  |
Laclede Gas | Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Deferred Charges - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above | 0 | [1] | 0 |
Fair value of liability derivatives presented above | 0 | [1] | 0 |
Laclede Gas | Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Current Liabilities - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above |  |  | 0.2 |
Fair value of liability derivatives presented above |  |  | 4.0 |
Laclede Gas | Gas Utility | Natural gas contracts | Not Designated as Hedging Instrument | Deferred Credits and Other Liabilities - Other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair value of asset derivatives presented above |  |  | 0 |
Fair value of liability derivatives presented above |  |  | $ 1.4 |
[1] | The fair values of Asset Derivatives and Liability Derivatives exclude the fair value of cash margin receivables or payables with counterparties subject to netting arrangements. Fair value amounts of derivative contracts (including the fair value amounts of cash margin receivables and payables) for which there is a legal right to set off are presented net on the Consolidated Balance Sheets. As such, the gross balances presented in the table above are not indicative of the Company’s net economic exposure. Refer to Note 9, Fair Value Measurements, to the Financial Statements for information on the valuation of derivative instruments.

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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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