Revisions and Restatements of Consolidated Financial Statements - Statements of Income (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
Non-utility revenue									$ 6,255.7	$ 5,638.8	$ 4,955.4
Non-utility cost of sales									3,858.4	3,640.0	3,304.2
Operating and administrative expenses	396.1	407.5	461.5	426.9	400.1	404.5	443.8	342.7	1,692.0	1,591.1	1,267.0
Depreciation	78.5	76.4	74.0	72.5	72.4	69.4	68.5	52.9	301.4	263.2	201.0
Other income, net	(8.3)	(7.0)	(7.5)	(10.0)	(10.8)	(8.1)	(12.8)	(8.1)	(32.8)	(39.8)	(45.5)
Operating income	(12.3)	41.5	507.7	294.2	(15.0)	3.2	385.0	165.4	831.1	538.6	642.4
Interest expense	(59.5)	(59.2)	(60.1)	(61.5)	(61.0)	(60.9)	(62.5)	(36.0)	(240.3)	(220.4)	(138.0)
Income before income taxes	(72.3)	(17.7)	447.7	232.7	(76.1)	(57.7)	309.1	129.3	590.4	304.6	465.4
Income taxes	13.2	(5.1)	(106.0)	(64.9)	7.7	(4.1)	(77.2)	(33.3)	(162.8)	(106.9)	(145.4)
Net income	(59.1)	(22.8)	341.7	167.8	(68.4)	(61.8)	231.9	96.0	427.6	197.7	320.0
(Deduct net income) add net loss attributable to noncontrolling interests, principally in AmeriGas Partners	44.9	31.9	(161.0)	(65.3)	62.1	67.1	(95.6)	(21.1)	(149.5)	12.5	(74.6)
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
Basic earnings per share	$ (0.12)	$ 0.08	$ 1.59	$ 0.91	$ (0.06)	$ 0.05	$ 1.21	$ 0.67	$ 2.44	$ 1.87	$ 2.20
Diluted earnings per share	$ (0.12)	$ 0.08	$ 1.57	$ 0.90	$ (0.06)	$ 0.05	$ 1.20	$ 0.66	$ 2.41	$ 1.85	$ 2.17
As Previously Reported
Non-utility revenue										5,636.7	4,955.8
Non-utility cost of sales										3,652.1	3,332.4
Operating and administrative expenses		404.7	465.8	426.9	400.2	405.8	443.3	342.4		1,591.7	1,266.4
Depreciation		76.5	71.7	71.8	73.2	69.5	68.7	52.8		264.2	201.2
Other income, net		(9.0)	(7.5)	(10.0)	(11.2)	(8.1)	(10.9)	(8.1)		(38.3)	(46.5)
Operating income		53.1	486.2	296.1	(28.6)	(19.2)	380.8	188.3		521.3	616.0
Interest expense		(59.2)	(60.1)	(60.3)	(58.9)	(61.3)	(65.3)	(36.0)		(221.5)	(138.0)
Income before income taxes		(6.1)	426.2	235.8	(87.6)	(80.5)	302.1	152.2		286.2	439.0
Income taxes		(9.0)	(100.0)	(65.1)	13.6	4.0	(75.1)	(42.1)		(99.6)	(130.8)
Net income		(15.1)	326.2	170.7	(74.0)	(76.5)	227.0	110.1		186.6	308.2
(Deduct net income) add net loss attributable to noncontrolling interests, principally in AmeriGas Partners		29.8	(154.3)	(68.1)	59.3	70.2	(93.6)	(23.1)		12.8	(75.3)
Net income attributable to UGI Corporation		14.7	171.9	102.6	(14.7)	(6.3)	133.4	87.0		199.4	232.9
Basic earnings per share		$ 0.13	$ 1.51	$ 0.91	$ (0.13)	$ (0.06)	$ 1.19	$ 0.78		$ 1.77	$ 2.09
Diluted earnings per share		$ 0.13	$ 1.49	$ 0.90	$ (0.13)	$ (0.06)	$ 1.18	$ 0.77		$ 1.76	$ 2.06
Adjustment
Non-utility revenue										2.1	(0.4)
Non-utility cost of sales										(12.1)	(28.2)
Operating and administrative expenses		2.8	(4.3)		(0.1)	(1.3)	0.5	0.3		(0.6)	0.6
Depreciation		(0.1)	2.3	0.7	(0.8)	(0.1)	(0.2)	0.1		(1.0)	(0.2)
Other income, net		2.0			0.4		(1.9)			(1.5)	1.0
Operating income		(11.6)	21.5	(1.9)	13.6	22.4	4.2	(22.9)		17.3	26.4
Interest expense				(1.2)	(2.1)	0.4	2.8			1.1
Income before income taxes		(11.6)	21.5	(3.1)	11.5	22.8	7.0	(22.9)		18.4	26.4
Income taxes		3.9	(6.0)	0.2	(5.9)	(8.1)	(2.1)	8.8		(7.3)	(14.6)
Net income		(7.7)	15.5	(2.9)	5.6	14.7	4.9	(14.1)		11.1	11.8
(Deduct net income) add net loss attributable to noncontrolling interests, principally in AmeriGas Partners		2.1	(6.7)	2.8	2.8	(3.1)	(2.0)	2.0		(0.3)	0.7
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 earnings per share		$ (0.05)	$ 0.08	$ 0.00	$ 0.07	$ 0.10	$ 0.03	$ (0.11)		$ 0.09	$ 0.11