Revisions and Restatements of Consolidated Financial Statements - Key Financial Metrics (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Operating income	$ (12.3)	$ 41.5	$ 507.7	$ 294.2	$ (15.0)	$ 3.2	$ 385.0	$ 165.4	$ 831.1	$ 538.6	$ 642.4
Net income attributable to UGI Corporation	(14.2)	9.1	180.7	102.5	(6.3)	5.3	136.3	74.9	278.1	210.2	245.4
Diluted (in dollars per share)	$ (0.12)	$ 0.08	$ 1.57	$ 0.90	$ (0.06)	$ 0.05	$ 1.20	$ 0.66	$ 2.41	$ 1.85	$ 2.17
Adjustment
Operating income		(11.6)	21.5	(1.9)	13.6	22.4	4.2	(22.9)		17.3	26.4
Net income attributable to UGI Corporation		(5.6)	8.8	(0.1)	8.4	11.6	2.9	(12.1)		10.8	12.5
Diluted (in dollars per share)		$ (0.05)	$ 0.08	$ 0.00	$ 0.07	$ 0.10	$ 0.03	$ (0.11)		$ 0.09	$ 0.11
Midstream & Marketing hedge accounting | Adjustment
Operating income		(6.9)	12.5	0.7	15.5	18.5	2.2	(19.3)		17.0	27.6
Net income attributable to UGI Corporation		(4.1)	7.3	0.4	9.1	10.8	1.3	(11.3)		10.0	16.2
Diluted (in dollars per share)		$ (0.04)	$ 0.06	$ 0.00	$ 0.08	$ 0.10	$ 0.01	$ (0.10)		$ 0.09	$ 0.14
Partnership customer credits | Adjustment
Operating income		0	7.0	(2.8)	(1.4)	3.2	(0.4)	(3.2)		(1.8)	0.1
Net income attributable to UGI Corporation		0	1.1	(0.4)	(0.2)	0.5	(0.1)	(0.8)		(0.6)	0
Diluted (in dollars per share)		$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.01)		$ 0.00	$ 0.00
Other | Adjustment
Operating income		(4.7)	2.0	0.2	(0.5)	0.7	2.4	(0.4)		2.1	(1.3)
Net income attributable to UGI Corporation		$ (1.5)	$ 0.4	$ (0.1)	$ (0.5)	$ 0.3	$ 1.7	$ 0		$ 1.4	$ (3.7)
Diluted (in dollars per share)		$ (0.01)	$ 0.01	$ 0.00	$ (0.01)	$ 0.00	$ 0.02	$ 0.00		$ 0.00	$ (0.03)