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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
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