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INFORMATION BY OPERATING SEGMENT - Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting [Abstract] |  |
Net Income | $ 45.2 | $ 46.9
Unrealized loss (gain) on energy-related derivative contracts | 3.8 | (4.9)
Lower of cost or market inventory adjustments | (0.1) | 0.6
Realized gain on economic hedges prior to sale of the physical commodity | (0.1) | (0.1)
Acquisition, divestiture and restructuring activities | 0.1 | 1.3
Income tax effect of adjustments | (1.4) | 1.3
Net Economic Earnings | $ 47.5 | $ 45.1

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- Definition Net economic earnings exclude from reported net income the after-tax impact of net unrealized gains and losses and other timing differences associated with energy-related transactions. Net economic earnings will also exclude, if applicable, the after-tax impact of costs related to acquisition, divestiture, and restructuring activities. + References No definition available. + Details
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