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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Shares |  |  |  |
Shares under option - beginning balance (in shares) | 8,197,069 | 8,781,748 | 8,488,451 |
Granted (in shares) | 1,197,100 | 1,401,400 | 1,343,800 |
Canceled (in shares) | (123,012) | (152,017) | (60,236) |
Expired (in shares) | (13,699) | (1,666) |  |
Exercised (in shares) | (779,353) | (1,832,396) | (990,267) |
Shares under option - ending balance (in shares) | 8,478,105 | 8,197,069 | 8,781,748 | 8,488,451
Weighted - Average Option Price |  |  |  |
Shares under option - beginning balance (in dollars per share) | $ 33.93 | $ 30.20 | $ 26.68 |
Granted (in dollars per share) | 53.27 | 47.85 | 46.51 |
Canceled (in dollars per share) | 48.69 | 42.14 | 41.86 |
Exercised (in dollars per share) | 25.75 | 26.00 | 21.40 |
Expired (in dollars per share) | 47.49 | 35.80 |  |
Shares under option - ending balance (in dollars per share) | $ 37.18 | $ 33.93 | $ 30.20 | $ 26.68
Total Intrinsic Value |  |  |  |
Shares under option - beginning balance | $ 176.6 | $ 146.7 | $ 157.6 |
Exercised | 22.8 | 44.5 | 26.7 |
Shares under option - beginning balance | $ 114.9 | $ 176.6 | $ 146.7 | $ 157.6
Weighted - Average Contract Term (Years) |  |  |  |
Weighted - Average Contract Term (Years) | 5 years 10 months 24 days | 6 years 2 months 12 days | 6 years 3 months 18 days | 6 years 7 months 6 days
Options Exercisable |  |  |  |
Options exercisable (in shares) | 5,963,530 | 5,498,330 | 5,973,668 |
Option exercisable (in dollars per share) | $ 32.02 | $ 28.63 | $ 25.53 |
Total Intrinsic Value | $ 109.3 |  |  |
Weighted - Average Contract Term (Years) | 4 years 10 months 24 days |  |  |
Options Not Exercisable |  |  |  |
Options not exercisable (in shares) | 2,514,575 |  |  |
Options not exercisable (in dollars per share) | $ 49.43 |  |  |
Total Intrinsic Value | $ 5.6 |  |  |
Weighted - Average Contract Term (Years) | 7 years 4 months 24 days |  |  |

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