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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | $ (118.8) | $ (104.1) | $ (341.3) | $ (301.5)
Interest expense | (56.5) | (56.8) | (172.8) | (168.0)
Impairment of tradenames | (75.0) | 0.0 | (75.0) | 0.0
Loss on extinguishments of debt | 0.0 | (4.4) | 0.0 | (59.7)
(Loss) income before income taxes | (1.1) | (79.3) | $ 849.8 | 735.8
Cost-method Investments, other than temporary impairment |  |  |  | 7.0
Amerigas Propane | AmeriGas OLP |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
General Partnership interest (percentage) |  |  | 1.01% |
Corporate & Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | (0.2) | (0.2) | $ (0.7) | (0.7)
Interest expense | (0.1) | (0.1) | (0.4) | (0.1)
Loss on extinguishments of debt |  | 0.0 |  | 0.0
(Loss) income before income taxes | 89.2 | (54.6) | 37.0 | 15.1
Gains (losses) on unsettled commodity derivative instruments, net | 95.5 | (52.7) | 54.0 | 28.9
Operating Segments | Amerigas Propane |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Partnership Adjusted EBITDA | 67.2 | 58.4 | 570.8 | 514.7
Depreciation and amortization | (46.4) | (46.2) | (139.0) | (135.8)
Interest expense | (40.4) | (40.6) | (122.0) | (120.6)
Impairment of tradenames | (75.0) | 0.0 | (75.0) | 0.0
Loss on extinguishments of debt | 0.0 | (4.4) | 0.0 | (59.7)
MGP environmental remediation accrual | 0.0 | (7.5) | 0.0 | (7.5)
Noncontrolling interest | (0.5) | (0.1) | 3.0 | 2.4
(Loss) income before income taxes | $ (95.1) | $ (40.4) | $ 237.8 | $ 193.5

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- Definition Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596 + Details
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