Quarterly Data (Unaudited) (Details) (USD $) In Millions, except Per Share data	3 Months Ended								12 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Quarterly Data (Unaudited) [Abstract]
Revenues	$ 1,039.3	$ 1,105.4	$ 2,181.0	$ 1,765.6	$ 890.4	$ 961.9	$ 2,120.3	$ 1,618.8	$ 6,091.3	$ 5,591.4	$ 5,737.8
Operating (loss) income	(10.5)	17.2	357.0	252.3	18.8	31.2	366.0	243.2	616.0	659.2	685.3
Loss from equity investees	(0.1)	(0.2)	(0.4)	(0.2)	(0.2)	(1.9)			(0.9)	(2.1)	(3.1)
Loss on extinguishments of debt	(19.3)		(18.8)						(38.1)
Net (loss) income	(48.9)	(13.5)	215.6	155.0	(18.4)	(4.2)	232.8	145.5	308.2	355.7	382.0
Net income attributable to UGI Corporation	$ (22.4)	$ (7.2)	$ 149.4	$ 113.1	$ 2.1	$ 3.4	$ 157.1	$ 98.4	$ 232.9	$ 261.0	$ 258.5
Earnings per common share attributable to UGI Corporation stockholders:
Basic	$ (0.20)	$ (0.06)	$ 1.34	$ 1.02	$ 0.02	$ 0.03	$ 1.44	$ 0.90	$ 2.09	$ 2.38	$ 2.38
Diluted	$ (0.20)	$ (0.06)	$ 1.32	$ 1.01	$ 0.02	$ 0.03	$ 1.43	$ 0.90	$ 2.06	$ 2.36	$ 2.36