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Condensed Financial Information of Registrant (Parent Company) - Balance Sheets (Details) (USD $) In Millions, except Share data, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 419.5 | $ 389.3 | $ 319.9 | $ 238.5
Deferred income taxes | 10.1 | 10.6 |  |
Total current assets | 1,663.0 | 1,627.3 |  |
Other assets | 209.0 | 182.6 |  |
Total assets | 10,093.0 | 10,008.8 | 9,676.9 |
Current liabilities |  |  |  |
Derivative instruments | 40.2 | 30.0 |  |
Total current liabilities | 1,430.9 | 1,424.9 |  |
Commitments and contingencies (Note 1) |  |  |  |
Common stockholders’ equity: |  |  |  |
UGI Common Stock, without par value (authorized - 450,000,000 shares; issued - 173,770,641 and 173,675,691 shares, respectively) | 1,215.6 | 1,208.1 |  |
Retained earnings | 1,509.4 | 1,308.3 |  |
Accumulated other comprehensive (loss) income | (21.2) | 8.4 |  |
Treasury stock, at cost | (44.7) | (32.3) |  |
Total UGI Corporation stockholders’ equity | 2,659.1 | 2,492.5 |  |
Total liabilities and equity | 10,093.0 | 10,008.8 |  |
Condensed Financial Information of Registrant [Abstract] |  |  |  |
UGI Common Stock, without par value (in dollars per share) | $ 0.00 | $ 0.00 |  |
UGI Common Stock, without par value authorized (in shares) | 450,000,000 | 450,000,000 |  |
UGI Common Stock, without par value, issued (in shares) | 173,770,641 | 173,675,691 |  |
Parent Company |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0.8 | 0.9 | 1.9 | 0.4
Accounts and notes receivable | 3.9 | 2.9 |  |
Deferred income taxes | 0.4 | 0.4 |  |
Prepaid expenses and other current assets | 0.3 | 0.3 |  |
Total current assets | 5.4 | 4.5 |  |
Investments in subsidiaries | 2,663.9 | 2,488.7 |  |
Other assets | 55.5 | 49.9 |  |
Total assets | 2,724.8 | 2,543.1 |  |
Current liabilities |  |  |  |
Accounts and notes payable | 11.8 | 11.0 |  |
Derivative instruments | 0 | 0 |  |
Accrued liabilities | 6.0 | 3.9 |  |
Total current liabilities | 17.8 | 14.9 |  |
Noncurrent liabilities | 47.9 | 35.7 |  |
Commitments and contingencies (Note 1) |  |  |  |
Common stockholders’ equity: |  |  |  |
UGI Common Stock, without par value (authorized - 450,000,000 shares; issued - 173,770,641 and 173,675,691 shares, respectively) | 1,215.6 | 1,208.1 |  |
Retained earnings | 1,509.4 | 1,308.3 |  |
Accumulated other comprehensive (loss) income | (21.2) | 8.4 |  |
Treasury stock, at cost | (44.7) | (32.3) |  |
Total UGI Corporation stockholders’ equity | 2,659.1 | 2,492.5 |  |
Total liabilities and equity | $ 2,724.8 | $ 2,543.1 |  |
Condensed Financial Information of Registrant [Abstract] |  |  |  |
UGI Common Stock, without par value (in dollars per share) | $ 0 | $ 0 |  |
UGI Common Stock, without par value authorized (in shares) | 450,000,000 | 450,000,000 |  |
UGI Common Stock, without par value, issued (in shares) | 173,770,641 | 173,675,691 |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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