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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, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Shares |  |  |  |
Shares under option - beginning balance (in shares) | 8,488,451 | 9,255,377 | 8,957,290 |
Granted (in shares) | 1,343,800 | 1,510,625 | 1,336,985 |
Canceled (in shares) | (60,236) | (84,213) | (85,365) |
Exercised (in shares) | (990,267) | (2,193,338) | (953,533) |
Shares under option - ending balance (in shares) | 8,781,748 | 8,488,451 | 9,255,377 | 8,957,290
Weighted Average Option Price |  |  |  |
Shares under option - beginning balance (in dollars per share) | $ 26.68 | $ 23.97 | $ 21.44 |
Granted (in dollars per share) | 46.51 | 34.67 | 37.70 |
Canceled (in dollars per share) | 41.86 | 34.13 | 30.45 |
Exercised (in dollars per share) | 21.40 | 20.38 | 19.10 |
Shares under option - ending balance (in dollars per share) | $ 30.20 | $ 26.68 | $ 23.97 | $ 21.44
Total Intrinsic Value |  |  |  |
Shares under option - beginning balance | $ 157.6 | $ 104.5 | $ 113.3 |
Exercised | 26.7 | 40.1 | 15.4 |
Shares under option - beginning balance | $ 146.7 | $ 157.6 | $ 104.5 | $ 113.3
Weighted Average Contract Term (Years) |  |  |  |
Weighted average contract term (in years) | 6 years 3 months 18 days | 6 years 7 months | 6 years 7 months 18 days | 7 years
Options Exercisable |  |  |  |
Options exercisable (in shares) | 5,973,668 | 5,522,370 | 6,050,946 |
Option exercisable (in dollars per share) | $ 25.53 | $ 22.94 | $ 20.74 |
Option exercisable | $ 127.4 |  |  |
Option exercisable (in years) | 5 years 3 months 18 days |  |  |
Options Not Exercisable |  |  |  |
Options not exercisable (in shares) | 2,808,080 |  |  |
Options not exercisable (in dollars per share) | $ 40.13 |  |  |
Options not exercisable | $ 19.3 |  |  |
Options not exercisable (in years) | 7 years 9 months 18 days |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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