Common Stock And Equity Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended								1 Months Ended	12 Months Ended																		0 Months Ended		12 Months Ended					12 Months Ended				12 Months Ended				12 Months Ended
	Jan. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012 UGI Corporation	Sep. 30, 2014 UGI Corporation Common Stock	Sep. 30, 2013 UGI Corporation Common Stock	Sep. 30, 2012 UGI Corporation Common Stock	Jan. 30, 2014 UGI Corporation Common Stock	Mar. 31, 2012 AmeriGas Partners Common Units	Sep. 30, 2014 UGI Stock Option Awards	Sep. 30, 2013 UGI Stock Option Awards	Sep. 30, 2012 UGI Stock Option Awards	Sep. 30, 2014 Amerigas Performance Units and Stock Units	Sep. 30, 2013 Amerigas Performance Units and Stock Units	Sep. 30, 2012 Amerigas Performance Units and Stock Units	Sep. 30, 2014 AmeriGas Performance Unit	Sep. 30, 2014 AmeriGas Partners Common Units	Sep. 30, 2014 UGI Performance Units and Stock Units	Sep. 30, 2013 UGI Performance Units and Stock Units	Sep. 30, 2012 UGI Performance Units and Stock Units	Sep. 30, 2014 UGI Stock Units		Sep. 30, 2013 UGI Stock Units	Sep. 30, 2012 UGI Stock Units	Sep. 30, 2014 UGI Performance Units	Sep. 30, 2013 UGI Performance Units	Sep. 30, 2012 UGI Performance Units	Jan. 12, 2012 Heritage Propane	Jan. 12, 2012 Heritage Propane	Sep. 30, 2014 Noncontrolling Interests	Sep. 30, 2013 Noncontrolling Interests	Sep. 30, 2012 Noncontrolling Interests	Sep. 30, 2012 Noncontrolling Interests UGI Corporation	Sep. 30, 2014 2004 Omnibus Equity Compensation Plan (OECP) UGI Corporation Common Stock	Sep. 30, 2014 2004 Omnibus Equity Compensation Plan (OECP) UGI Performance Units and Stock Units	Sep. 30, 2014 2004 Omnibus Equity Compensation Plan (OECP) UGI Performance Units	Sep. 30, 2014 2013 Omnibus Incentive Compensation Plan (OICP) UGI Corporation Common Stock	Jan. 24, 2013 2013 Omnibus Incentive Compensation Plan (OICP) UGI Corporation Common Stock	Sep. 30, 2014 2013 Omnibus Incentive Compensation Plan (OICP) UGI Performance Units and Stock Units	Sep. 30, 2014 2013 Omnibus Incentive Compensation Plan (OICP) UGI Performance Units	Sep. 30, 2014 2010 Propane Plan Amerigas Performance Units and Stock Units	Jun. 30, 2010 2010 Propane Plan Amerigas Performance Units and Stock Units	Sep. 30, 2013 2010 Propane Plan AmeriGas Performance Unit	Sep. 30, 2014 2010 Propane Plan AmeriGas Partners Common Units	Sep. 30, 2013 2010 Propane Plan AmeriGas Partners Common Units	Sep. 30, 2012 2010 Propane Plan AmeriGas Partners Common Units
Share-based Compensation Arrangement by Share-based Payment Award
Maximum number of shares authorized for repurchase									10,000,000
Stock Issued During Period, Shares, Share-based Compensation, Gross						94,950	238,800	176,250
Treasury stock acquired (in usd)		$ 44.7	$ 32.3						$ 39.8
Common Units issued by AmeriGas Partners (in units)																													29,567,362	29,567,362
Units sold in public offering										7,000,000
Increase in stockholders' equity, net					196.3
Adjustments to reflect change in ownership of AmeriGas Partners, net of tax																															0	0	(321.4)	(321.4)
Pre-tax equity-based compensation expense		25.8	17.6	14.5
After tax equity-based compensation expense		16.6	11.4	8.7
Shares of UGI Common Stock granted as awards																																							21,750,000				2,800,000
Cash received from stock option exercises		22.2	30.8	9.4
Associated tax benefits		13.0	12.1	2.3
Unrecognized compensation cost associated with unvested Amerigas unit awards		6.5												2.9					8.8
Weighted-average period for unvested Amerigas unit awards		1 year 8 months 12 days												1 year 8 months 12 days					1 year 8 months 12 days
Weighted-average fair value of stock option granted under stock plans											$ 4.97	$ 3.29	$ 2.87													$ 32.32	$ 25.31	$ 18.17																	$ 43.34	$ 42.58	$ 43.22
Award performance period																			3 years
Target award paid to employee																																				grantees may receive 0% to 200% of the target award granted. For such grants, if UGI’s TSR ranks below the 40th percentile compared to the UGI comparator group, the employee will not be paid. At the 40th percentile, the employee will be paid an award equal to 50% of the target award; at the 50th percentile, 100%; and at the 100th percentile, 200%				grantees may receive 0% to 200% of the target award granted. For such grants, if UGI’s TSR ranks below the 25th percentile compared to the UGI comparator group, the employee will not be paid. At the 25th percentile, the employee will be paid an award equal to 25% of the target award; at the 40th percentile, 70%; at the 50th percentile, 100%; and at the 90th percentile and above, 200%
Minimum percentage amount of guarantee on target award granted																																					0.00%				0.00%
Maximum percentage amount of guarantee on target award granted																																					200.00%				200.00%
Percentage of target award paid at 40th percentile																																					50.00%				70.00%
Percentage of target award paid at 50th percentile																																					100.00%				100.00%
Percentage of target award paid at 100th percentile																																					200.00%				200.00%
Expected term of Performance Unit awards																										3 years																		3 years
Granted																	53,800	32,658	234,264	381,900	359,768	44,814	[1]	51,038	63,668	189,450																			86,458	65,136	248,818
Weighted average grant date fair value unit awards																	$ 41.50	$ 46.37	$ 31.38	$ 24.87	$ 18.45	$ 27.41	[1]			$ 32.32
Unrecognized compensation cost associated with common unit														200,235	224,167				1,306,181	1,380,902
Fair value of AmeriGas units vested														4.1	2.8	5.1			8.7	6.0	3.6
Liabilities associated with share based compensation														$ 1.5	$ 1.1				$ 18.5	$ 8.0
Number of common units subject to original awards granted																																			172,646			17,499,524							2,443,808
Performance units ultimately paid																																										3 years
Granted Under Plan Term (in years)		10 years
Stock Repurchase Program, Period in Force	4 years

[1] Generally, shares granted under UGI Stock Unit awards are paid approximately 70% in shares. UGI Stock Unit awards granted in Fiscal 2013 and Fiscal 2012 were 51,038 and 63,668, respectively.