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Acquisitions - Unaudited Pro Forma Revenues, Net Income, and Earnings Per Share Data (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
Business Combinations [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
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 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
Totalgaz SAS |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 7,065.8
Net income attributable to UGI Corporation |  |  |  |  |  |  |  |  |  |  | $ 341.2
Earnings per common share attributable to UGI Corporation stockholders: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.97
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1.94

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