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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 | 12 Months Ended
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Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ (13.3) | $ 21.7 | $ 108.0 | $ 45.2 | $ (14.2) | $ 10.7 | $ 100.8 | $ 46.9 | $ 161.6 | $ 144.2 | $ 136.9
Unrealized loss (gain) on energy-related derivatives |  |  |  |  |  |  |  |  | 6.0 | (0.1) | (2.8)
Lower of cost or market inventory adjustments |  |  |  |  |  |  |  |  | 0.0 | 0.2 | 0.4
Realized (gain) loss on economic hedges prior to the sale of the physical commodity |  |  |  |  |  |  |  |  | (0.3) | (1.6) | 2.4
Acquisition, divestiture and restructuring activities |  |  |  |  |  |  |  |  | 4.0 | 9.2 | 9.8
Gain on sale of property |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (7.6)
Income tax effect of adjustments |  |  |  |  |  |  |  |  | (3.7) | (2.8) | (0.8)
Net Economic Earnings |  |  |  |  |  |  |  |  | $ 167.6 | $ 149.1 | $ 138.3

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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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