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ACQUISITIONS - Pro Forma Information, Revenues and Earnings of MGE (Details) (Missouri Gas Energy (MGE), USD $) In Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2014
Missouri Gas Energy (MGE) |  |
Pro Forma Information of Acquiree since Acquisition Date |  |
Total net revenues | $ 22.0 | $ 554.2
Net Income | $ 1.8 | $ 39.5
Earnings per share: |  |
Basic (in dollars per share) | $ 0.07 | $ 1.10
Diluted (in dollars per share) | $ 0.07 | $ 1.10

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