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Quarterly Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,113.9 | $ 1,153.5 | $ 2,173.8 | $ 1,679.5 | $ 976.2 | $ 1,130.8 | $ 1,972.1 | $ 1,606.6 | $ 6,120.7 | $ 5,685.7 | $ 6,691.1
Operating income (loss) | 27.6 | (2.8) | 513.2 | 466.2 | (88.6) | 155.7 | 615.4 | 305.5 | 1,004.2 | 988.0 | 834.9
(Loss) income from equity investees | 1.3 | 0.9 | 2.3 | (0.2) | (0.1) | 0.0 | 0.0 | (0.1) | 4.3 | (0.2) | (1.2)
Loss on extinguishments of debt | 0.0 | (4.4) | (22.1) | (33.2) | (11.8) | (37.1) | 0.0 | 0.0 | (59.7) | (48.9) | 0.0
Net income (loss) including noncontrolling interests | (16.7) | (62.2) | 311.8 | 290.9 | (115.7) | 28.6 | 408.0 | 167.9 | 523.8 | 488.8 | 414.0
Net income (loss) attributable to UGI Corporation | $ 5.0 | $ (19.0) | $ 219.9 | $ 230.7 | $ (43.8) | $ 60.7 | $ 233.2 | $ 114.6 | $ 436.6 | $ 364.7 | $ 281.0
Earnings (loss) per common share attributable to UGI Corporation stockholders: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.03 | $ (0.11) | $ 1.27 | $ 1.33 | $ (0.25) | $ 0.35 | $ 1.35 | $ 0.66 | $ 2.51 | $ 2.11 | $ 1.62
Diluted (in dollars per share) | $ 0.03 | $ (0.11) | $ 1.24 | $ 1.30 | $ (0.25) | $ 0.34 | $ 1.33 | $ 0.65 | $ 2.46 | $ 2.08 | $ 1.60
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in net income attributable to UGI Corporation, income tax settlement refund |  |  |  | $ 6.7 |  |  |  |  |  |  |
Increase in net income attributable to UGI Corporation, income tax settlement refund (in dollars per share) |  |  |  | $ 0.04 |  |  |  |  |  |  |
Increase in net income attributable to UGI Corporation due to release of valuation allowance against future uses of foreign tax credit carryforwards | $ 7.6 |  |  |  |  |  |  |  | $ (7.2) |  |
Increase in net income per diluted share due to release of valuation allowance against future uses of foreign tax credit carryforwards (in dollars per share) | $ 0.04 |  |  |  |  |  |  |  |  |  |
Increase (decrease) in net income (loss) attributable to UGI Corporation, loss on extinguishments of debt |  | $ (0.7) | $ (3.6) | $ (5.3) | $ (1.8) | $ (6.1) |  |  |  |  |
Increase (decrease) in net income (loss) attributable to UGI Corporation, loss on extinguishments of debt (in dollars per share) |  | $ (0.01) | $ (0.02) | $ (0.03) | $ (0.01) | $ (0.03) |  |  |  |  |
Decrease in net income attributable to UGI Corporation, impairment of cost basis investment | $ 2.6 |  | $ 4.5 |  |  |  |  |  |  |  |
Decrease in net income attributable to UGI Corporation, impairment of cost basis investment (in dollars per share) | $ 0.02 |  | $ 0.03 |  |  |  |  |  |  |  |
UGI France |  |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in net income attributable to UGI Corporation, adjustments to net deferred income tax liabilities |  |  |  | $ 27.4 |  |  |  |  |  |  |
Increase in net income attributable to UGI Corporation, adjustments to net deferred income tax liabilities (in dollars per share) |  |  |  | $ 0.15 |  |  |  |  |  |  |

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