Common Stock and Equity Based Compensation (Details 1) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
UGI Stock Option Awards
Shares under option, Beginning Balance, Shares	8,057,772	7,673,179	7,557,045
Shares under option, Granted	1,516,900	1,508,050	1,443,558
Share under option, Cancelled	(89,836)	(321,600)	(235,437)
Share under option, Exercised	(2,688,868)	(801,857)	(1,091,987)
Share under option, Ending Balance, Shares	6,795,968	8,057,772	7,673,179	7,557,045
Weighted Average Option Price, Beginning Balance	$ 26.62	$ 25.55	$ 23.81
Weighted Average Option Price, Granted	$ 33.57	$ 29.26	$ 31.55
Weighted Average Option Price, Cancelled	$ 30.51	$ 27.74	$ 27.79
Weighted Average Option Price, Exercised	$ 24.58	$ 20.93	$ 20.95
Weighted Average Option Price, Ending Balance	$ 28.92	$ 26.62	$ 25.55	$ 23.81
Shares Under Option, Total Intrinsic Value, Beginning Balance	$ 41.4	$ 15.1	$ 36.2
Exercised Shares, Total Intrinsic Value	35.4	7.2	11.4
Share Under Option, Total Intrinsic Value, Ending Balance	69.6	41.4	15.1	36.2
Weighted Average Contract Term	6 years 9 months 18 days	6 years 1 month 6 days	6 years 2 months 12 days	6 years 6 months 1 day
Option exercisable, Shares	3,914,061	5,317,698	4,879,784
Option exercisable, Weighted average option price	$ 26.93	$ 25.32	$ 24.15
Option exercisable, Total intrinsic value	47.8
Option exercisable, Weighted Average Contract Term	5 years 7 months 6 days
Non vested options, Shares	2,881,907
Non vested options, Weighted average option price	$ 31.63
Non vested options, Total intrinsic value	$ 21.8
Non Vested Options Weighted Average Contract Term	8 years 6 months
Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 0
Upper range limit	$ 24.99
Additional information relating to stock options outstanding and exercisable
Number of outstanding options	1,778,435
Options outstanding , Weighted average remaining contractual life (in years)	5 years 2 months 12 days
Options outstanding, Weighted average exercise price	$ 23.92
Number of exercisable options	1,718,735
Options exercisable, Weighted average exercise price	$ 23.91
Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 25
Upper range limit	$ 30
Additional information relating to stock options outstanding and exercisable
Number of outstanding options	2,265,255
Options outstanding , Weighted average remaining contractual life (in years)	6 years 6 months
Options outstanding, Weighted average exercise price	$ 28.34
Number of exercisable options	1,358,454
Options exercisable, Weighted average exercise price	$ 27.80
Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 30.01
Upper range limit	$ 35
Additional information relating to stock options outstanding and exercisable
Number of outstanding options	2,559,678
Options outstanding , Weighted average remaining contractual life (in years)	8 years 1 month 6 days
Options outstanding, Weighted average exercise price	$ 32.12
Number of exercisable options	836,872
Options exercisable, Weighted average exercise price	$ 31.70
Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 35
Additional information relating to stock options outstanding and exercisable
Number of outstanding options	192,600
Options outstanding , Weighted average remaining contractual life (in years)	9 years 7 months 6 days
Options outstanding, Weighted average exercise price	$ 39.45
Number of exercisable options	0
Options exercisable, Weighted average exercise price	$ 0.00