Equity (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Changes in UGI's equity and the equity of the noncontrolling interests
Beginning Balance			$ 2,061.6	$ 1,816.8
Net income	(13.5)	(4.2)	357.1	374.1
Net gains (losses) on derivative instruments			25.6	(4.1)
Reclassifications of net losses (gains) on derivative instruments (net of taxes)			11.0	16.5
Benefit plans			2.1	2.3
Foreign currency translation adjustments			37.8	(99.1)
Comprehensive (loss) income (including noncontrolling interests)	(14.0)	(62.4)	433.6	289.7
Dividends and distributions			(154.4)	(137.3)
Equity transactions			38.9	28.4
Other			1.2	(3.6)
Ending Balance	2,380.9	1,994.0	2,380.9	1,994.0
Noncontrolling interests [Member]
Changes in UGI's equity and the equity of the noncontrolling interests
Beginning Balance			237.1	225.4
Net income			101.8	115.2
Net gains (losses) on derivative instruments			14.8	6.9
Reclassifications of net losses (gains) on derivative instruments (net of taxes)			(16.0)	(14.4)
Comprehensive (loss) income (including noncontrolling interests)			100.6	107.7
Dividends and distributions			(69.7)	(66.2)
Equity transactions			0.5	0.7
Other			1.2	(3.6)
Ending Balance	269.7	264.0	269.7	264.0
Common Stock [Member]
Changes in UGI's equity and the equity of the noncontrolling interests
Beginning Balance			906.1	875.6
Equity transactions			28.8	20.5
Ending Balance	934.9	896.1	934.9	896.1
Retained earnings [Member]
Changes in UGI's equity and the equity of the noncontrolling interests
Beginning Balance			966.7	804.3
Net income			255.3	258.9
Comprehensive (loss) income (including noncontrolling interests)			255.3	258.9
Dividends and distributions			(84.7)	(71.1)
Ending Balance	1,137.3	992.1	1,137.3	992.1
Accumulated other comprehensive income (loss) [Member]
Changes in UGI's equity and the equity of the noncontrolling interests
Beginning Balance			(10.1)	(38.9)
Net gains (losses) on derivative instruments			10.8	(11.0)
Reclassifications of net losses (gains) on derivative instruments (net of taxes)			27.0	30.9
Benefit plans			2.1	2.3
Foreign currency translation adjustments			37.8	(99.1)
Comprehensive (loss) income (including noncontrolling interests)			77.7	(76.9)
Ending Balance	67.6	(115.8)	67.6	(115.8)
Treasury stock [Member]
Changes in UGI's equity and the equity of the noncontrolling interests
Beginning Balance			(38.2)	(49.6)
Equity transactions			9.6	7.2
Ending Balance	$ (28.6)	$ (42.4)	$ (28.6)	$ (42.4)

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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