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Condensed Financial Information of Registrant (Parent Company) - Balance Sheets (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 369.7 | $ 419.5 | $ 389.3 | $ 319.9
Deferred income taxes | 7.8 | 10.1 |  |
Total current assets | 1,459.8 | 1,663.0 |  |
Other assets | 212.8 | 209.0 |  |
Total assets | 10,546.6 | 10,093.0 | 10,008.8 |
Current liabilities |  |  |  |
Total current liabilities | $ 1,678.9 | $ 1,430.9 |  |
Commitments and contingencies |  |  |  |
Common stockholders’ equity: |  |  |  |
UGI Common Stock, without par value (authorized - 450,000,000 shares; issued - 173,806,991 and 173,770,641 shares, respectively) | $ 1,214.6 | $ 1,215.6 |  |
Retained earnings | 1,636.9 | 1,509.4 |  |
Accumulated other comprehensive loss | (114.6) | (21.2) | 8.4 |
Treasury stock, at cost | (44.9) | (44.7) |  |
Total UGI Corporation stockholders’ equity | 2,692.0 | 2,659.1 |  |
Total liabilities and equity | $ 10,546.6 | $ 10,093.0 |  |
Condensed Financial Information of Registrant [Abstract] |  |  |  |
Common stock, shares authorized | 450,000,000 | 450,000,000 |  |
Common stock, shares issued | 173,806,991 | 173,770,641 |  |
Parent Company |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | $ 1.9 | $ 0.8 | $ 0.9 | $ 1.9
Accounts receivable - related parties | 3.3 | 3.9 |  |
Deferred income taxes | 0.4 | 0.4 |  |
Prepaid expenses and other current assets | 4.3 | 0.3 |  |
Total current assets | 9.9 | 5.4 |  |
Investments in subsidiaries | 2,689.7 | 2,663.9 |  |
Other assets | 58.7 | 55.5 |  |
Total assets | 2,758.3 | 2,724.8 |  |
Current liabilities |  |  |  |
Accounts and notes payable | 10.9 | 11.8 |  |
Accrued liabilities | 5.0 | 6.0 |  |
Total current liabilities | 15.9 | 17.8 |  |
Noncurrent liabilities | $ 50.4 | $ 47.9 |  |
Commitments and contingencies |  |  |  |
Common stockholders’ equity: |  |  |  |
UGI Common Stock, without par value (authorized - 450,000,000 shares; issued - 173,806,991 and 173,770,641 shares, respectively) | $ 1,214.6 | $ 1,215.6 |  |
Retained earnings | 1,636.9 | 1,509.4 |  |
Accumulated other comprehensive loss | (114.6) | (21.2) |  |
Treasury stock, at cost | (44.9) | (44.7) |  |
Total UGI Corporation stockholders’ equity | 2,692.0 | 2,659.1 |  |
Total liabilities and equity | $ 2,758.3 | $ 2,724.8 |  |
Condensed Financial Information of Registrant [Abstract] |  |  |  |
Common stock, shares authorized | 450,000,000 | 450,000,000 |  |
Common stock, shares issued | 173,806,991 | 173,770,641 |  |

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