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Common Stock and Equity Based Compensation - Stock Option Awards (Details) - UGI Stock Option Awards - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Shares |  |  |  |
Shares under option - beginning balance (in shares) | 8,957,290 | 10,193,952 | 12,086,658 |
Granted (in shares) | 1,336,985 | 1,665,600 | 2,275,350 |
Canceled (in shares) | (85,365) | (86,707) | (134,754) |
Exercised (in shares) | (953,533) | (2,815,555) | (4,033,302) |
Shares under option - ending balance (in shares) | 9,255,377 | 8,957,290 | 10,193,952 | 12,086,658
Weighted Average Option Price |  |  |  |
Shares under option - beginning balance (in usd per share) | $ 21.44 | $ 19.28 | $ 17.75 |
Granted (in usd per share) | 37.70 | 27.93 | 22.38 |
Canceled (in usd per share) | 30.45 | 22.76 | 20.34 |
Exercised (in usd per share) | 19.10 | 17.44 | 16.39 |
Shares under option - ending balance (in usd per share) | $ 23.97 | $ 21.44 | $ 19.28 | $ 17.75
Total Intrinsic Value |  |  |  |
Shares under option - beginning balance (in usd) | $ 113.3 | $ 69.6 | $ 41.4 |
Exercised (in usd) | 15.4 | 37.4 | 35.4 |
Shares under option - beginning balance (in usd) | $ 104.5 | $ 113.3 | $ 69.6 | $ 41.4
Weighted Average Contract Term |  |  |  |
Weighted average contract term (in years) | 6 years 7 months 18 days | 7 years | 6 years 9 months 18 days | 6 years 1 month 6 days
Options Exercisable [Abstract] |  |  |  |
Options exercisable (in shares) | 6,050,946 | 5,073,347 | 5,871,091 |
Option exercisable (in usd per share) | $ 20.74 | $ 19.45 | $ 17.95 |
Option exercisable (in usd) | $ 85.4 |  |  |
Option exercisable (in years) | 5 years 9 months 18 days |  |  |
Options Not Exercisable [Abstract] |  |  |  |
Options not exercisable (in shares) | 3,204,431 |  |  |
Options not exercisable (in usd per share) | $ 30.05 |  |  |
Options not exercisable (in usd) | $ 19.1 |  |  |
Options not exercisable (in years) | 8 years 3 months 18 days |  |  |

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