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ACQUISITIONS - Summary of Consideration Paid, Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 12, 2016 | Sep. 30, 2017 | Sep. 30, 2015 | Sep. 12, 2017 | Sep. 30, 2016 | Sep. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 1,171.6 |  | $ 1,171.6 | $ 946.0 |  | $ 1,164.9 | $ 937.8
Measurement period adjustments |  |  |  |  |  |  |
Goodwill |  |  | 6.7 | $ 8.2 |  |  |
EnergySouth |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Utility plant | 199.5 | $ 199.5 | 199.5 |  |  |  |
Cash | 2.0 | 2.0 | 2.0 |  |  |  |
Other current assets | 17.7 | 17.5 | 17.7 |  |  |  |
Other assets | 69.1 | 79.8 | 69.1 |  |  |  |
Long-term debt | (67.0) | (67.0) | (67.0) |  |  |  |
Other current liabilities | (42.7) | (42.7) | (42.7) |  |  |  |
Deferred tax liabilities | (35.5) | (35.5) | (35.5) |  |  |  |
Other liabilities | (52.8) | (52.8) | (52.8) |  |  |  |
Total identifiable net assets | 90.3 | 100.8 | 90.3 |  |  |  |
Goodwill | 225.6 | 218.9 | $ 225.6 |  | $ 225.6 |  |
Measurement period adjustments |  |  |  |  |  |  |
Other current assets |  | 0.2 |  |  |  |  |
Other assets |  | (10.7) |  |  |  |  |
Total identifiable net assets |  | (10.5) |  |  |  |  |
Goodwill |  | 6.7 |  |  |  |  |
Consideration (cash) |  | (3.8) |  |  |  |  |
Consideration (cash) | $ 315.9 | $ 319.7 |  |  |  |  |

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