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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Laclede Gas | Sep. 30, 2013 Laclede Gas | Sep. 01, 2013 Laclede Gas | Sep. 30, 2014 Missouri Gas Energy (MGE) | Sep. 30, 2013 Missouri Gas Energy (MGE) | Sep. 01, 2013 Missouri Gas Energy (MGE) | Sep. 30, 2014 Missouri Gas Energy (MGE) Laclede Gas | Sep. 30, 2013 Missouri Gas Energy (MGE) Laclede Gas | Aug. 31, 2014 Alagasco | Sep. 30, 2013 Alagasco | Sep. 01, 2013 Alagasco | Sep. 30, 2014 Alagasco Laclede Gas | Sep. 30, 2013 Alagasco Laclede Gas
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Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 937.8 | $ 247.1 | $ 210.2 | $ 247.1 | $ 210.2 | $ 210.2 | $ 247.1 | $ 210.2 | $ 210.2 | $ 247.1 | $ 727.6 | $ 0 | $ 727.6 | $ 0 | $ 0

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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