Condensed Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 227.0	$ 215.6	$ 337.1	$ 370.6
Net (losses) gains on derivative instruments (net of tax of $16.2, $(1.3), $39.3 and $(13.1), respectively)	(39.4)	10.5	(80.7)	36.4
Reclassifications of net losses on derivative instruments (net of tax of ($13.8) $(6.1), $(21.8) and $(17.0), respectively)	32.2	0.2	44.7	13.9
Foreign currency adjustments (net of tax of $(8.0), $(9.3), $(1.5) and $(6.0), respectively)	23.9	36.7	1.7	24.6
Benefit plans (net of tax of $(0.1), $0.1, $(0.2) and $(1.4), respectively)	0.1	(0.1)	0.2	2.1
Comprehensive income	243.8	262.9	303.0	447.6
Less: comprehensive income attributable to noncontrolling interests, principally in AmeriGas Partners	(91.4)	(64.7)	(107.7)	(111.4)
Comprehensive income attributable to UGI Corporation	$ 152.4	$ 198.2	$ 195.3	$ 336.2