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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, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Shares        
Shares under option - beginning balance (in shares) 9,255,377 8,957,290 10,193,952  
Granted (in shares) 1,510,625 1,336,985 1,665,600  
Canceled (in shares) (84,213) (85,365) (86,707)  
Exercised (in shares) (2,193,338) (953,533) (2,815,555)  
Shares under option - ending balance (in shares) 8,488,451 9,255,377 8,957,290 10,193,952
Weighted Average Option Price        
Shares under option - beginning balance (in dollars per share) $ 23.97 $ 21.44 $ 19.28  
Granted (in dollars per share) 34.67 37.70 27.93  
Canceled (in dollars per share) 34.13 30.45 22.76  
Exercised (in dollars per share) 20.38 19.10 17.44  
Shares under option - ending balance (in dollars per share) $ 26.68 $ 23.97 $ 21.44 $ 19.28
Total Intrinsic Value        
Shares under option - beginning balance $ 104.5 $ 113.3 $ 69.6  
Exercised 40.1 15.4 37.4  
Shares under option - beginning balance $ 157.6 $ 104.5 $ 113.3 $ 69.6
Weighted Average Contract Term        
Weighted average contract term (in years) 6 years 7 months 6 years 7 months 18 days 7 years 6 years 9 months 18 days
Options Exercisable        
Options exercisable (in shares) 5,522,370 6,050,946 5,073,347  
Option exercisable (in dollars per share) $ 22.94 $ 20.74 $ 19.45  
Option exercisable $ 123.2      
Option exercisable (in years) 5 years 7 months      
Options Not Exercisable        
Options not exercisable (in shares) 2,966,081      
Options not exercisable (in dollars per share) $ 33.63      
Options not exercisable $ 34.4      
Options not exercisable (in years) 8 years 2 months