Common Stock and Equity Based Compensation - Stock Option Awards (Details) (UGI Stock Option Awards, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
UGI Stock Option Awards
Shares
Shares under option - beginning balance (in shares)	10,193,952	12,086,658	11,509,769
Granted	1,665,600	2,275,350	2,262,075
Cancelled	(86,707)	(134,754)	(482,400)
Exercised	(2,815,555)	(4,033,302)	(1,202,786)
Shares under option - ending balance (in shares)	8,957,290	10,193,952	12,086,658	11,509,769
Weighted Average Option Price
Shares under option - beginning balance (in usd per share)	$ 19.28	$ 17.75	$ 17.03
Granted	$ 27.93	$ 22.38	$ 19.51
Cancelled	$ 22.76	$ 20.34	$ 18.49
Exercised	$ 17.44	$ 16.39	$ 13.95
Shares under option - ending balance (in usd per share)	$ 21.44	$ 19.28	$ 17.75	$ 17.03
Total Intrinsic Value
Shares under option - beginning balance (in usd)	$ 69.6	$ 41.4	$ 15.1
Exercised	37.4	35.4	7.2
Shares under option - beginning balance (in usd)	113.3	69.6	41.4	15.1
Weighted Average Contract Term
Weighted average contract term (in years)	7 years 0 months 0 days	6 years 9 months 18 days	6 years 1 month 6 days	6 years 2 months 12 days
Options Exercisable [Abstract]
Options exercisable (in shares)	5,073,347	5,871,091	7,976,547
Option exercisable (in usd per share)	$ 19.45	$ 17.95	$ 16.88
Option exercisable (in usd)	74.2
Option exercisable (in years)	6 years 0 months 0 days
Options Not Exercisable [Abstract]
Options not exercisable (in shares)	3,883,943
Options not exercisable (in usd per share)	$ 24.02
Options not exercisable (in usd)	$ 39.1
Options not exercisable (in years)	8 years 6 months