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INFORMATION BY OPERATING SEGMENT - Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ (14.9) | $ 11.7 | $ 52.2 | $ 35.6 | $ (9.6) | $ 6.6 | $ 30.2 | $ 25.6 | $ 84.6 | $ 52.8 | $ 62.6
Unrealized loss (gain) on energy-related derivatives |  |  |  |  |  |  |  |  | (0.9) | 0.5 | (0.3)
Lower of cost or market inventory adjustments |  |  |  |  |  |  |  |  | (0.7) | 0.9 | 0
Realized (gain) loss on economic hedges prior to the sale of the physical commodity |  |  |  |  |  |  |  |  | (0.2) | 0 | 0.2
Acquisition, divestiture and restructuring activities |  |  |  |  |  |  |  |  | 17.3 | 10.8 | 0.1
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  | $ 100.1 | $ 65.0 | $ 62.6

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- Definition Change in earnings, net of income tax, that represents costs related to acquisition, divestiture, and restructuring activities. + References No definition available. + Details
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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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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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