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SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY) - STATEMENTS OF INCOME (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Financial Statements, Captions |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,150.4 | $ 1,363.7 | $ 2,606.1 | $ 2,200.2 | $ 1,273.1 | $ 1,440.9 | $ 2,812.0 | $ 2,125.2 | $ 7,320.4 | $ 7,651.2 | $ 6,120.7
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Operating and administrative expenses |  |  |  |  |  |  |  |  | 1,963.2 | 2,012.8 | 1,867.6
Other operating income, net |  |  |  |  |  |  |  |  | (31.1) | (31.3) | (10.5)
Total costs and expenses |  |  |  |  |  |  |  |  | 6,703.3 | 6,586.5 | 5,110.7
Operating income | (99.0) | 9.6 | 538.8 | 167.7 | 49.2 | 29.5 | 591.0 | 395.0 | 617.1 | 1,064.7 | 1,010.0
Pension and other postretirement plans non-service expense |  |  |  |  |  |  |  |  | 0.5 | (0.6) | (5.8)
Interest expense |  |  |  |  |  |  |  |  | (257.8) | (230.1) | (223.5)
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 92.6 | 32.1 | 177.6
Equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 9.1 | 4.3 | 4.3
Net income attributable to UGI Corporation | $ (51.5) | $ (1.9) | $ 245.4 | $ 64.2 | $ 24.4 | $ 52.4 | $ 276.0 | $ 365.9 | 256.2 | 718.7 | 436.6
Comprehensive income attributable to UGI Corporation |  |  |  |  |  |  |  |  | $ 156.6 | $ 701.7 | $ 497.9
Earnings per common share attributable to UGI Corporation stockholders: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.27) | $ (0.01) | $ 1.41 | $ 0.37 | $ 0.14 | $ 0.30 | $ 1.59 | $ 2.11 | $ 1.44 | $ 4.13 | $ 2.51
Diluted (in dollars per share) | $ (0.27) | $ (0.01) | $ 1.38 | $ 0.36 | $ 0.14 | $ 0.30 | $ 1.57 | $ 2.07 | $ 1.41 | $ 4.06 | $ 2.46
Weighted - average common shares outstanding (thousands): |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 189,905 | 174,759 | 174,501 | 174,413 | 174,391 | 173,991 | 173,570 | 173,670 | 178,417 | 173,908 | 173,662
Diluted (in shares) | 189,905 | 174,759 | 177,318 | 177,566 | 177,506 | 176,807 | 176,350 | 176,948 | 181,111 | 176,905 | 177,159
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.0
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Operating and administrative expenses |  |  |  |  |  |  |  |  | 50.0 | 63.4 | 44.5
Other operating income, net |  |  |  |  |  |  |  |  | (49.7) | (52.2) | (45.9)
Total costs and expenses |  |  |  |  |  |  |  |  | 0.3 | 11.2 | (1.4)
Operating income |  |  |  |  |  |  |  |  | (0.3) | (11.2) | 1.4
Pension and other postretirement plans non-service expense |  |  |  |  |  |  |  |  | (0.9) | (1.3) | (1.8)
Interest expense |  |  |  |  |  |  |  |  | (6.4) |  |
Intercompany interest income |  |  |  |  |  |  |  |  | 0.3 | 0.1 | 0.0
Loss before income taxes |  |  |  |  |  |  |  |  | (7.3) | (12.4) | (0.4)
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (2.8) | 6.1 | (5.7)
(Loss) income before equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | (4.5) | (18.5) | 5.3
Equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 260.7 | 737.2 | 431.3
Net income attributable to UGI Corporation |  |  |  |  |  |  |  |  | 256.2 | 718.7 | 436.6
Other comprehensive (loss) income |  |  |  |  |  |  |  |  | (3.3) | 3.4 | 1.3
Equity in other comprehensive (loss) income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | (96.3) | (20.4) | 60.0
Comprehensive income attributable to UGI Corporation |  |  |  |  |  |  |  |  | $ 156.6 | $ 701.7 | $ 497.9
Earnings per common share attributable to UGI Corporation stockholders: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.44 | $ 4.13 | $ 2.51
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.41 | $ 4.06 | $ 2.46
Weighted - average common shares outstanding (thousands): |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) |  |  |  |  |  |  |  |  | 178,417 | 173,908 | 173,662
Diluted (in shares) |  |  |  |  |  |  |  |  | 181,111 | 176,905 | 177,159

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