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REGULATORY MATTERS - Schedule of Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory Assets, Current | $ 57.7 | $ 17.5
Regulatory assets | 637.4 | 545.9
Total Regulatory Assets | 695.1 | 563.4
Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | 38.3 | 0
Regulatory liabilities | 126.1 | 82.6
Total Regulatory Liabilities | 167.1 | 85.5
Pension and postretirement benefit costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | 19.8 | 0
Refundable negative salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | 13.3 | 0
Regulatory liabilities | 26.8 | 0
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | 5.2 | 0
Unamortized investment tax credits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 2.7 | 2.9
Postretirement liabilities |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 28.4 | 0
Accrued cost of removal |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 60.5 | 59.1
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 10.4 | 23.5
Total Regulatory Liabilities (non-current) |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 128.8 | 85.5
Pension and postretirement benefit costs |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets, Current | 1.3 | 0
Regulatory assets | 451.6 | 381.4
Unamortized purchased gas adjustments |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 54.0 | 17.5
Future income taxes due from customers |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 117.0 | 112.9
Accrued cost of removal |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 2.8 | 0
Accretion and depreciation of asset retirement obligations |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 18.4 | 0
Enhanced stability reserve |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 3.3 | 0
Purchased gas costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 4.3 | 18.2
Compensated absences |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 8.2 | 8.0
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets, Current | 2.4 | 0
Regulatory assets | 31.8 | 25.4
Sub Total Regulatory Assets (non-current) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 637.4 | 545.9
Laclede Gas |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets, Current | 54.0 | 17.5
Regulatory assets | 541.7 | 545.9
Total Regulatory Assets | 595.7 | 563.4
Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Regulatory liabilities | 70.0 | 61.9
Total Regulatory Liabilities | 72.7 | 64.8
Laclede Gas | Pension and postretirement benefit costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Laclede Gas | Refundable negative salvage |  |
Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Regulatory liabilities | 0 | 0
Laclede Gas | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | 0 | 0
Laclede Gas | Unamortized investment tax credits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 2.7 | 2.9
Laclede Gas | Postretirement liabilities |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 0 | 0
Laclede Gas | Accrued cost of removal |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 60.5 | 59.0
Laclede Gas | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 9.5 | 2.9
Laclede Gas | Total Regulatory Liabilities (non-current) |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 72.7 | 64.8
Laclede Gas | Pension and postretirement benefit costs |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory assets | 380.4 | 381.4
Laclede Gas | Unamortized purchased gas adjustments |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 54.0 | 17.5
Laclede Gas | Future income taxes due from customers |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 117.0 | 112.9
Laclede Gas | Accrued cost of removal |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 0 | 0
Laclede Gas | Accretion and depreciation of asset retirement obligations |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 0 | 0
Laclede Gas | Enhanced stability reserve |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 0 | 0
Laclede Gas | Purchased gas costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 4.3 | 18.2
Laclede Gas | Compensated absences |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 8.2 | 8.0
Laclede Gas | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory assets | 31.8 | 25.4
Laclede Gas | Sub Total Regulatory Assets (non-current) |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 541.7 | $ 545.9

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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