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Condensed Financial Information of Registrant (Parent Company) - Balance Sheets (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 558.4 | $ 502.8 | $ 369.7 | $ 419.5
Total current assets | 1,697.5 | 1,423.8 |  |
Property, plant and equipment, net | 5,537.0 | 5,238.0 |  |
Other assets | 259.0 | 217.7 |  |
Total assets | 11,582.2 | 10,847.2 | 10,514.2 |
Current liabilities |  |  |  |
Total current liabilities | 1,690.1 | 1,442.0 |  |
Commitments and contingencies |  |  |  |
Common stockholders’ equity: |  |  |  |
Common Stock, without par value (authorized – 450,000,000 shares; issued – 173,987,691 and 173,894,141 shares, respectively) | 1,188.6 | 1,201.6 |  |
Retained earnings | 2,106.7 | 1,834.1 |  |
Accumulated other comprehensive loss | (93.4) | (154.7) |  |
Treasury stock, at cost | (38.6) | (36.9) |  |
Total UGI Corporation stockholders’ equity | 3,163.3 | 2,844.1 |  |
Total liabilities and equity | $ 11,582.2 | $ 10,847.2 |  |
Condensed Financial Information of Registrant [Abstract] |  |  |  |
Common stock, shares authorized | 450,000,000 | 450,000,000 |  |
Common stock, shares issued | 173,987,691 | 173,894,141 |  |
Parent Company |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | $ 15.8 | $ 4.8 | $ 1.9 | $ 0.8
Accounts receivable – related parties | 4.5 | 9.2 |  |
Prepaid expenses and other current assets | 15.6 | 5.0 |  |
Total current assets | 35.9 | 19.0 |  |
Property, plant and equipment, net | 0.4 | 0.0 |  |
Investments in subsidiaries | 3,119.7 | 2,825.7 |  |
Other assets | 82.0 | 69.8 |  |
Total assets | 3,238.0 | 2,914.5 |  |
Current liabilities |  |  |  |
Accounts and notes payable | 12.3 | 11.4 |  |
Accrued liabilities | 5.9 | 4.4 |  |
Total current liabilities | 18.2 | 15.8 |  |
Noncurrent liabilities | 56.5 | 54.6 |  |
Commitments and contingencies |  |  |  |
Common stockholders’ equity: |  |  |  |
Common Stock, without par value (authorized – 450,000,000 shares; issued – 173,987,691 and 173,894,141 shares, respectively) | 1,188.6 | 1,201.6 |  |
Retained earnings | 2,106.7 | 1,834.1 |  |
Accumulated other comprehensive loss | (93.4) | (154.7) |  |
Treasury stock, at cost | (38.6) | (36.9) |  |
Total UGI Corporation stockholders’ equity | 3,163.3 | 2,844.1 |  |
Total liabilities and equity | $ 3,238.0 | $ 2,914.5 |  |
Condensed Financial Information of Registrant [Abstract] |  |  |  |
Common stock, shares authorized | 450,000,000 | 450,000,000 |  |
Common stock, shares issued | 173,987,691 | 173,894,141 |  |

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