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Segment Information - Schedule of Segment Reporting (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,273.1 | $ 1,440.9 | $ 2,812.0 | $ 2,125.2 | $ 1,113.9 | $ 1,153.5 | $ 2,173.8 | $ 1,679.5 | $ 7,651.2 | $ 6,120.7 | $ 5,685.7
Cost of sales |  |  |  |  |  |  |  |  | 4,074.9 | 2,837.3 | 2,437.5
Operating income | 54.3 | 28.5 | 589.5 | 391.8 | 27.6 | (2.8) | 513.2 | 466.2 | 1,064.1 | 1,004.2 | 988.0
Income (loss) from equity investees |  |  |  |  |  |  |  |  | 4.3 | 4.3 | (0.2)
Gain (loss) on foreign currency contracts, net |  |  |  |  |  |  |  |  | 16.2 | (23.9) | 0.0
Loss on extinguishments of debt |  |  |  |  |  | (0.7) | (3.6) | (5.3) | 0.0 | (59.7) | (48.9)
Interest expense |  |  |  |  |  |  |  |  | (230.1) | (223.5) | (228.9)
Income before income taxes |  |  |  |  |  |  |  |  | 854.5 | 701.4 | 710.0
Net income attributable to UGI | 24.4 | $ 52.4 | $ 276.0 | $ 365.9 | 5.0 | $ (19.0) | $ 219.9 | $ 230.7 | 718.7 | 436.6 | 364.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 455.1 | 416.3 | 400.9
Noncontrolling interests’ net income |  |  |  |  |  |  |  |  | 103.7 | 87.2 | 124.1
Total assets | 11,980.9 |  |  |  | 11,582.2 |  |  |  | 11,980.9 | 11,582.2 | 10,847.2
Short-term borrowings | 424.9 |  |  |  | 366.9 |  |  |  | 424.9 | 366.9 | 291.7
Capital expenditures (including the effects of accruals) |  |  |  |  |  |  |  |  | 597.0 | 624.3 | 604.6
Investments in equity investees | 87.6 |  |  |  | 59.1 |  |  |  | 87.6 | 59.1 | 25.9
Goodwill | 3,160.4 |  |  |  | 3,107.2 |  |  |  | 3,160.4 | 3,107.2 | 2,989.0
AmeriGas Propane |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  |  | (48.9)
Goodwill | 2,003.0 |  |  |  | 2,001.3 |  |  |  | 2,003.0 | 2,001.3 | 1,978.3
UGI International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  |  | 0.0
Goodwill | 963.7 |  |  |  | 912.2 |  |  |  | 963.7 | 912.2 | 817.0
Midstream & Marketing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  |  | 0.0
Goodwill | 11.6 |  |  |  | 11.6 |  |  |  | 11.6 | 11.6 | 11.6
UGI Utilities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  |  | 0.0
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (370.8) | (222.7) | (133.9)
Cost of sales |  |  |  |  |  |  |  |  | (366.6) | (218.3) | (131.5)
Operating income |  |  |  |  |  |  |  |  | 0.3 | 0.3 | 0.2
Income (loss) from equity investees |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gain (loss) on foreign currency contracts, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Interest expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income before income taxes |  |  |  |  |  |  |  |  | 0.3 | 0.3 | 0.2
Net income attributable to UGI |  |  |  |  |  |  |  |  | (1.1) | 0.1 | 0.1
Depreciation and amortization |  |  |  |  |  |  |  |  | (0.3) | (0.2) | (0.2)
Noncontrolling interests’ net income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total assets | (125.3) |  |  |  | (51.5) |  |  |  | (125.3) | (51.5) | (136.6)
Short-term borrowings | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Capital expenditures (including the effects of accruals) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Investments in equity investees | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Goodwill | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Eliminations | AmeriGas Propane |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Eliminations | UGI International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Eliminations | Midstream & Marketing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 272.6 | 178.2 | 114.3
Eliminations | UGI Utilities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 93.9 | 40.1 | 17.1
Operating Segments | AmeriGas Propane |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,823.0 | 2,453.5 | 2,311.8
Cost of sales |  |  |  |  |  |  |  |  | 1,314.7 | 1,002.9 | 864.8
Operating income |  |  |  |  |  |  |  |  | 347.2 | 355.3 | 356.3
Income (loss) from equity investees |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gain (loss) on foreign currency contracts, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  | 0.0 | (59.7) | (48.9)
Interest expense |  |  |  |  |  |  |  |  | (163.1) | (160.2) | (164.1)
Income before income taxes |  |  |  |  |  |  |  |  | 184.1 | 135.4 | 143.3
Net income attributable to UGI |  |  |  |  |  |  |  |  | 174.7 | 44.6 | 43.2
Depreciation and amortization |  |  |  |  |  |  |  |  | 185.8 | 190.5 | 190.0
Noncontrolling interests’ net income |  |  |  |  |  |  |  |  | 97.6 | 64.4 | 75.9
Partnership Adjusted EBITDA |  |  |  |  |  |  |  |  | 605.5 | 551.3 | 543.0
Total assets | 3,933.9 |  |  |  | 4,069.4 |  |  |  | 3,933.9 | 4,069.4 | 4,071.8
Short-term borrowings | 232.0 |  |  |  | 140.0 |  |  |  | 232.0 | 140.0 | 153.2
Capital expenditures (including the effects of accruals) |  |  |  |  |  |  |  |  | 101.3 | 98.1 | 101.7
Investments in equity investees | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Goodwill | 2,003.0 |  |  |  | 2,001.3 |  |  |  | 2,003.0 | 2,001.3 | 1,978.3
Operating Segments | UGI International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,683.8 | 1,877.5 | 1,868.8
Cost of sales |  |  |  |  |  |  |  |  | 1,620.1 | 935.3 | 903.8
Operating income |  |  |  |  |  |  |  |  | 223.1 | 195.7 | 206.6
Income (loss) from equity investees |  |  |  |  |  |  |  |  | (0.5) | 0.0 | (0.2)
Gain (loss) on foreign currency contracts, net |  |  |  |  |  |  |  |  | (12.7) | (0.1) |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  | 0.0 |
Interest expense |  |  |  |  |  |  |  |  | (21.1) | (20.6) | (24.4)
Income before income taxes |  |  |  |  |  |  |  |  | 188.8 | 175.0 | 182.0
Net income attributable to UGI |  |  |  |  |  |  |  |  | 138.6 | 158.6 | 111.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 140.6 | 117.4 | 112.4
Noncontrolling interests’ net income |  |  |  |  |  |  |  |  | (3.0) | 0.2 |
Total assets | 3,279.0 |  |  |  | 3,132.0 |  |  |  | 3,279.0 | 3,132.0 | 2,865.1
Short-term borrowings | 1.4 |  |  |  | 17.9 |  |  |  | 1.4 | 17.9 | 0.5
Capital expenditures (including the effects of accruals) |  |  |  |  |  |  |  |  | 111.4 | 90.3 | 99.9
Investments in equity investees | 12.8 |  |  |  | 8.1 |  |  |  | 12.8 | 8.1 | 8.5
Goodwill | 963.7 |  |  |  | 912.2 |  |  |  | 963.7 | 912.2 | 817.0
Operating Segments | Midstream & Marketing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,149.1 | 943.0 | 752.3
Cost of sales |  |  |  |  |  |  |  |  | 1,090.8 | 856.7 | 602.2
Operating income |  |  |  |  |  |  |  |  | 173.9 | 139.2 | 146.7
Income (loss) from equity investees |  |  |  |  |  |  |  |  | 4.8 | 4.3 | 0.0
Gain (loss) on foreign currency contracts, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  | 0.0 |
Interest expense |  |  |  |  |  |  |  |  | (2.4) | (2.1) | (2.1)
Income before income taxes |  |  |  |  |  |  |  |  | 176.3 | 141.4 | 144.6
Net income attributable to UGI |  |  |  |  |  |  |  |  | 196.8 | 86.9 | 87.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 43.5 | 35.4 | 30.6
Noncontrolling interests’ net income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total assets | 1,328.9 |  |  |  | 1,165.5 |  |  |  | 1,328.9 | 1,165.5 | 1,038.2
Short-term borrowings | 2.0 |  |  |  | 39.0 |  |  |  | 2.0 | 39.0 | 25.5
Capital expenditures (including the effects of accruals) |  |  |  |  |  |  |  |  | 43.1 | 117.5 | 140.4
Investments in equity investees | 74.8 |  |  |  | 51.0 |  |  |  | 74.8 | 51.0 | 17.4
Goodwill | 11.6 |  |  |  | 11.6 |  |  |  | 11.6 | 11.6 | 11.6
Operating Segments | UGI Utilities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 998.5 | 847.5 | 751.4
Cost of sales |  |  |  |  |  |  |  |  | 522.9 | 367.3 | 289.8
Operating income |  |  |  |  |  |  |  |  | 237.5 | 228.3 | 200.9
Income (loss) from equity investees |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gain (loss) on foreign currency contracts, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  | 0.0 |
Interest expense |  |  |  |  |  |  |  |  | (42.9) | (40.2) | (37.6)
Income before income taxes |  |  |  |  |  |  |  |  | 194.6 | 188.1 | 163.3
Net income attributable to UGI |  |  |  |  |  |  |  |  | 148.9 | 116.0 | 97.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 84.6 | 72.3 | 67.3
Noncontrolling interests’ net income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total assets | 3,266.6 |  |  |  | 2,994.0 |  |  |  | 3,266.6 | 2,994.0 | 2,743.1
Short-term borrowings | 189.5 |  |  |  | 170.0 |  |  |  | 189.5 | 170.0 | 112.5
Capital expenditures (including the effects of accruals) |  |  |  |  |  |  |  |  | 338.5 | 317.7 | 262.5
Investments in equity investees | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Goodwill | 182.1 |  |  |  | 182.1 |  |  |  | 182.1 | 182.1 | 182.1
Corporate & Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (3.2) | (0.8) | 1.4
Cost of sales |  |  |  |  |  |  |  |  | (107.0) | (106.6) | (91.6)
Operating income |  |  |  |  |  |  |  |  | 82.1 | 85.4 | 77.3
Income (loss) from equity investees |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gain (loss) on foreign currency contracts, net |  |  |  |  |  |  |  |  | 28.9 | (23.8) |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Interest expense |  |  |  |  |  |  |  |  | (0.6) | (0.4) | (0.7)
Income before income taxes |  |  |  |  |  |  |  |  | 110.4 | 61.2 | 76.6
Net income attributable to UGI |  |  |  |  |  |  |  |  | 60.8 | 30.4 | 25.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.9 | 0.9 | 0.8
Noncontrolling interests’ net income |  |  |  |  |  |  |  |  | 9.1 | 22.6 | 48.2
Total assets | 297.8 |  |  |  | 272.8 |  |  |  | 297.8 | 272.8 | 265.6
Short-term borrowings | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Capital expenditures (including the effects of accruals) |  |  |  |  |  |  |  |  | 2.7 | 0.7 | 0.1
Investments in equity investees | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Goodwill | $ 0.0 |  |  |  | $ 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Corporate, Intersegment Eliminations & Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 4.3 | $ 4.4 | $ 2.5

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