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Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 2,812.0 | $ 2,173.8 | $ 4,937.2 | $ 3,853.3 |
Cost of sales | 1,560.2 | 1,071.2 | 2,697.6 | 1,718.6 |
Segment profit: |  |  |  |  |
Operating income (loss) | 589.5 | 513.2 | 981.3 | 979.4 |
Income (loss) from equity investees | 0.7 | 2.3 | 1.7 | 2.1 |
(Losses) gains on foreign currency contracts, net | (11.0) | (1.2) | (15.8) | 0.1 |
Loss on extinguishments of debt | 0.0 | (22.1) | 0.0 | (55.3) |
Interest expense | (58.1) | (55.8) | (116.3) | (111.2) |
Income (loss) before income taxes | 521.1 | 436.4 | 850.9 | 815.1 |
Noncontrolling interests’ net income (loss) | 131.7 | 91.9 | 200.0 | 152.1 |
Depreciation and amortization | 112.2 | 99.3 | 222.5 | 197.4 |
Capital expenditures (including the effects of accruals) | 110.1 | 126.2 | 238.6 | 299.8 |
Total assets | 12,445.3 | 11,385.5 | 12,445.3 | 11,385.5 | $ 11,582.2
Short-term borrowings | 302.8 | 50.1 | 302.8 | 50.1 | 366.9
Goodwill | 3,218.1 | 2,948.4 | 3,218.1 | 2,948.4 | $ 3,107.2
Cost-method Investments, Other than Temporary Impairment |  | 7.0 | 7.0 |  |
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (188.9) | (95.8) | (286.0) | (164.3) |
Cost of sales | (187.9) | (94.9) | (283.9) | (162.6) |
Segment profit: |  |  |  |  |
Operating income (loss) | 0.3 | 0.0 | 0.5 | 0.1 |
Income (loss) from equity investees | 0.0 | 0.0 | 0.0 | 0.0 |
(Losses) gains on foreign currency contracts, net | 0.0 | 0.0 | 0.0 | 0.0 |
Loss on extinguishments of debt |  | 0.0 |  | 0.0 |
Interest expense | 0.0 | 0.0 | 0.0 | 0.0 |
Income (loss) before income taxes | 0.3 | 0.0 | 0.5 | 0.1 |
Noncontrolling interests’ net income (loss) | 0.0 | 0.0 | 0.0 | 0.0 |
Depreciation and amortization | (0.1) | (0.1) | (0.1) | (0.1) |
Capital expenditures (including the effects of accruals) | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | (59.4) | (58.6) | (59.4) | (58.6) |
Short-term borrowings | 0.0 | 0.0 | 0.0 | 0.0 |
Goodwill | 0.0 | 0.0 | 0.0 | 0.0 |
Eliminations | AmeriGas Propane |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Eliminations | UGI International |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Eliminations | Midstream & Marketing |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 129.0 | 76.2 | 207.2 | 136.4 |
Eliminations | UGI Utilities |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 58.7 | 18.8 | 76.4 | 26.3 |
Corporate, Intersegment Eliminations & Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 1.2 | 0.8 | 2.4 | 1.6 |
Operating Segments | AmeriGas Propane |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 1,040.3 | 863.6 | 1,827.6 | 1,540.8 |
Cost of sales | 483.7 | 355.8 | 849.8 | 616.5 |
Segment profit: |  |  |  |  |
Operating income (loss) | 266.6 | 227.3 | 414.5 | 369.2 |
Income (loss) from equity investees | 0.0 | 0.0 | 0.0 | 0.0 |
(Losses) gains on foreign currency contracts, net | 0.0 | 0.0 | 0.0 | 0.0 |
Loss on extinguishments of debt | 0.0 | (22.1) | 0.0 | (55.3) |
Interest expense | (41.0) | (40.0) | (81.6) | (80.0) |
Income (loss) before income taxes | 225.6 | 165.2 | 332.9 | 233.9 |
Partnership Adjusted EBITDA | 309.5 | 271.2 | 503.6 | 456.3 |
Noncontrolling interests’ net income (loss) | 155.7 | 112.7 | 223.7 | 153.9 |
Depreciation and amortization | 45.2 | 45.0 | 92.6 | 89.6 |
Capital expenditures (including the effects of accruals) | 23.6 | 27.2 | 47.2 | 53.6 |
Total assets | 4,149.8 | 4,238.1 | 4,149.8 | 4,238.1 |
Short-term borrowings | 154.5 | 0.0 | 154.5 | 0.0 |
Goodwill | 2,001.3 | 1,981.2 | 2,001.3 | 1,981.2 |
Operating Segments | UGI International |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 909.6 | 620.7 | 1,693.8 | 1,159.8 |
Cost of sales | 541.1 | 313.1 | 1,025.9 | 571.1 |
Segment profit: |  |  |  |  |
Operating income (loss) | 131.8 | 121.0 | 224.9 | 209.9 |
Income (loss) from equity investees | (0.1) | (0.1) | (0.3) | (0.3) |
(Losses) gains on foreign currency contracts, net | (9.0) | 0.1 | (13.7) | 0.2 |
Loss on extinguishments of debt |  | 0.0 |  | 0.0 |
Interest expense | (5.2) | (4.8) | (10.8) | (9.6) |
Income (loss) before income taxes | 117.5 | 116.2 | 200.1 | 200.2 |
Noncontrolling interests’ net income (loss) | (1.2) | 0.1 | (1.5) | 0.3 |
Depreciation and amortization | 34.9 | 27.6 | 67.1 | 55.5 |
Capital expenditures (including the effects of accruals) | 26.1 | 21.5 | 47.8 | 43.0 |
Total assets | 3,562.3 | 2,804.7 | 3,562.3 | 2,804.7 |
Short-term borrowings | 3.3 | 1.6 | 3.3 | 1.6 |
Goodwill | 1,023.2 | 773.6 | 1,023.2 | 773.6 |
Operating Segments | Midstream & Marketing |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 436.2 | 347.5 | 686.0 | 557.1 |
Cost of sales | 418.6 | 309.8 | 657.6 | 501.6 |
Segment profit: |  |  |  |  |
Operating income (loss) | 107.5 | 82.1 | 159.8 | 131.8 |
Income (loss) from equity investees | 0.8 | 2.4 | 2.0 | 2.4 |
(Losses) gains on foreign currency contracts, net | 0.0 | 0.0 | 0.0 | 0.0 |
Loss on extinguishments of debt |  | 0.0 |  | 0.0 |
Interest expense | (0.7) | (0.7) | (1.6) | (1.3) |
Income (loss) before income taxes | 107.6 | 83.8 | 160.2 | 132.9 |
Noncontrolling interests’ net income (loss) | 0.0 | 0.0 | 0.0 | 0.0 |
Depreciation and amortization | 10.8 | 8.8 | 20.9 | 16.8 |
Capital expenditures (including the effects of accruals) | 4.3 | 20.8 | 15.6 | 82.3 |
Total assets | 1,347.7 | 1,200.7 | 1,347.7 | 1,200.7 |
Short-term borrowings | 10.0 | 0.0 | 10.0 | 0.0 |
Goodwill | 11.5 | 11.5 | 11.5 | 11.5 |
Operating Segments | UGI Utilities |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 424.6 | 341.2 | 730.0 | 595.1 |
Cost of sales | 257.3 | 164.5 | 409.1 | 274.0 |
Segment profit: |  |  |  |  |
Operating income (loss) | 135.1 | 116.4 | 231.4 | 198.6 |
Income (loss) from equity investees | 0.0 | 0.0 | 0.0 | 0.0 |
(Losses) gains on foreign currency contracts, net | 0.0 | 0.0 | 0.0 | 0.0 |
Loss on extinguishments of debt |  | 0.0 |  | 0.0 |
Interest expense | (11.1) | (10.3) | (22.0) | (20.3) |
Income (loss) before income taxes | 124.0 | 106.1 | 209.4 | 178.3 |
Noncontrolling interests’ net income (loss) | 0.0 | 0.0 | 0.0 | 0.0 |
Depreciation and amortization | 21.1 | 17.7 | 41.5 | 35.1 |
Capital expenditures (including the effects of accruals) | 55.1 | 56.5 | 126.8 | 120.6 |
Total assets | 3,204.0 | 2,909.7 | 3,204.0 | 2,909.7 |
Short-term borrowings | 135.0 | 48.5 | 135.0 | 48.5 |
Goodwill | 182.1 | 182.1 | 182.1 | 182.1 |
Corporate & Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 1.3 | 0.8 | (0.2) | 0.5 |
Cost of sales | 47.4 | 22.9 | 39.1 | (82.0) |
Segment profit: |  |  |  |  |
Operating income (loss) | (51.8) | (33.6) | (49.8) | 69.8 |
Income (loss) from equity investees | 0.0 | 0.0 | 0.0 | 0.0 |
(Losses) gains on foreign currency contracts, net | (2.0) | (1.3) | (2.1) | (0.1) |
Loss on extinguishments of debt |  | 0.0 |  | 0.0 |
Interest expense | (0.1) | 0.0 | (0.3) | 0.0 |
Income (loss) before income taxes | (53.9) | (34.9) | (52.2) | 69.7 |
Noncontrolling interests’ net income (loss) | (22.8) | (20.9) | (22.2) | (2.1) |
Depreciation and amortization | 0.3 | 0.3 | 0.5 | 0.5 |
Capital expenditures (including the effects of accruals) | 1.0 | 0.2 | 1.2 | 0.3 |
Total assets | 240.9 | 290.9 | 240.9 | 290.9 |
Short-term borrowings | 0.0 | 0.0 | 0.0 | 0.0 |
Goodwill | 0.0 | 0.0 | 0.0 | 0.0 |
Gains (losses) on unsettled commodity derivative instruments, net | $ (48.1) | $ (23.9) | $ (41.5) | $ 81.6 |

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