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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, 2015 | Jun. 30, 2015 | [1] | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | [2] | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Condensed Financial Statements, Captions |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 1,082.8 | $ 1,148.1 | $ 2,455.6 | $ 2,004.6 | $ 1,311.4 | $ 1,486.7 | $ 3,163.3 | $ 2,315.9 | $ 6,691.1 | $ 8,277.3 | $ 7,194.7
Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |
Operating and administrative expenses |  |  |  |  |  |  |  |  |  | 1,773.9 | 1,752.6 | 1,692.0
Other income, net |  |  |  |  |  |  |  |  |  | 44.4 | 36.1 | 32.8
Total costs and expenses |  |  |  |  |  |  |  |  |  | 5,856.2 | 7,271.7 | 6,363.6
Operating income |  | (6.6) | 56.1 | 702.1 | 83.3 | (9.4) | 62.7 | 588.6 | 363.7 | 834.9 | 1,005.6 | 831.1
Income tax expense |  |  |  |  |  |  |  |  |  | 177.8 | 235.2 | 162.8
Equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  |  | (1.2) | (0.1) | (0.4)
Net income attributable to UGI Corporation |  | $ (9.2) | $ 9.6 | $ 246.5 | $ 34.1 | $ (19.8) | $ 20.6 | $ 214.4 | $ 122.0 | 281.0 | 337.2 | 278.1
Comprehensive income attributable to UGI Corporation |  |  |  |  |  |  |  |  |  | $ 187.6 | $ 307.6 | $ 341.7
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  | $ (0.05) | $ 0.06 | $ 1.42 | $ 0.20 | $ (0.11) | $ 0.12 | $ 1.24 | $ 0.71 | $ 1.62 | $ 1.95 | $ 1.63
Diluted (in dollars per share) |  | $ (0.05) | $ 0.05 | $ 1.40 | $ 0.19 | $ (0.11) | $ 0.12 | $ 1.22 | $ 0.70 | $ 1.60 | $ 1.92 | $ 1.60
Weighted-average common shares outstanding (thousands): |  |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) |  |  |  |  |  |  |  |  |  | 173,115 | 172,733 | 170,885
Diluted (in shares) |  |  |  |  |  |  |  |  |  | 175,667 | 175,231 | 173,282
Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.0
Costs and Expenses |  |  |  |  |  |  |  |  |  |  |  |
Operating and administrative expenses |  |  |  |  |  |  |  |  |  | 48.7 | 44.5 | 36.9
Other income, net | [3] |  |  |  |  |  |  |  |  | 48.5 | 44.2 | 36.7
Total costs and expenses |  |  |  |  |  |  |  |  |  | 0.2 | 0.3 | 0.2
Operating income |  |  |  |  |  |  |  |  |  | (0.2) | (0.3) | (0.2)
Intercompany interest income |  |  |  |  |  |  |  |  |  | 0.1 | 0.2 | 0.2
Loss before income taxes |  |  |  |  |  |  |  |  |  | (0.1) | (0.1) | 0.0
Income tax expense |  |  |  |  |  |  |  |  |  | 1.9 | 2.4 | 3.1
Loss before equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  |  | (2.0) | (2.5) | (3.1)
Equity in income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  |  | 283.0 | 339.7 | 281.2
Net income attributable to UGI Corporation |  |  |  |  |  |  |  |  |  | 281.0 | 337.2 | 278.1
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 0.1 | (0.7) | 1.1
Equity in other comprehensive (loss) income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  |  | (93.5) | (28.9) | 62.5
Comprehensive income attributable to UGI Corporation |  |  |  |  |  |  |  |  |  | $ 187.6 | $ 307.6 | $ 341.7
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.62 | $ 1.95 | $ 1.63
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.60 | $ 1.92 | $ 1.60
Weighted-average common shares outstanding (thousands): |  |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) |  |  |  |  |  |  |  |  |  | 173,115 | 172,733 | 170,885
Diluted (in shares) |  |  |  |  |  |  |  |  |  | 175,667 | 175,231 | 173,282
[1] | Includes loss on early extinguishment of debt at Antargaz which decreased net income attributable to UGI Corporation by $4.6 or $0.03 per diluted share (see Note 6)
[2] | Includes income tax expense of $5.7 to reflect the retroactive effects to Fiscal 2013 of new tax legislation in France regarding the deductibility of certain interest expense which decreased net income attributable to UGI Corporation by $5.7 or $0.03 per diluted share (see Note 7).
[3] | UGI provides certain financial and administrative services to certain of its subsidiaries. UGI bills these subsidiaries monthly for all direct expenses incurred by UGI on behalf of its subsidiaries as well as allocated shares of indirect corporate expense incurred or paid with respect to services provided by UGI. The allocation of indirect UGI corporate expenses to certain of its subsidiaries utilizes a weighted, three-component formula comprising revenues, operating expenses, and net assets employed and considers the relative percentage of such items for each subsidiary to the total of such items for all UGI operating subsidiaries for which general and administrative services are provided. Management believes that this allocation method is reasonable and equitable to its subsidiaries. These billed expenses are classified as “Other income, net” in the Statements of Income above.

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