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ACQUISITIONS - Missouri Gas Energy (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2014 Laclede Gas | Sep. 30, 2013 Laclede Gas | Sep. 30, 2012 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) | Feb. 14, 2014 Missouri Gas Energy (MGE) Laclede Gas | Dec. 20, 2013 Missouri Gas Energy (MGE) Laclede Gas | Sep. 01, 2013 Missouri Gas Energy (MGE) Laclede Gas | Sep. 30, 2014 Missouri Gas Energy (MGE) Laclede Gas | Sep. 30, 2013 Missouri Gas Energy (MGE) Laclede Gas | Sep. 01, 2013 Scenario, Previously Reported Missouri Gas Energy (MGE) | Sep. 01, 2013 Scenario, Previously Reported Missouri Gas Energy (MGE) Laclede Gas
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition purchase price | $ (23.9) | $ 975.0 | $ 0 | $ (23.9) | $ 975.0 | $ 0 |  |  |  |  |  |  |  |  | $ 475.0 |  | $ 975.0
Fair value adjustment of assets |  |  |  |  |  |  |  |  |  |  | 23.9 |  |  |  |  |  |
Proceeds from final reconciliation of acquisition of Missouri Gas Energy |  |  |  |  |  |  |  |  |  |  |  | 11.0 |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  | 940.2 | 940.2 |  |  |
Goodwill | $ 937.8 | $ 247.1 |  | $ 210.2 | $ 247.1 |  | $ 210.2 | $ 210.2 | $ 247.1 | $ 210.2 |  |  |  | $ 210.2 | $ 247.1 | $ 247.1 | $ 247.1

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