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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | $ (111.2) | $ (110.3)
Interest expense | (60.2) | (58.2)
(Loss) income before income taxes | $ 111.9 | 329.8
AmeriGas Propane | AmeriGas OLP |  |
Segment Reporting Information [Line Items] |  |
General partnership interest (percentage) | 1.01% |
Operating Segments | AmeriGas Propane |  |
Segment Reporting Information [Line Items] |  |
Partnership Adjusted EBITDA | $ 210.7 | 194.1
Depreciation and amortization | (45.7) | (47.4)
Interest expense | (42.4) | (40.6)
Noncontrolling interest | 1.6 | 1.2
(Loss) income before income taxes | 124.2 | 107.3
Corporate & Other |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | (0.1) | (0.2)
Interest expense | (0.2) | (0.2)
(Loss) income before income taxes | (168.0) | 1.7
Gains (losses) on unsettled commodity derivative instruments, net | $ (165.9) | $ 6.6

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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