Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net income	$ 427.6	$ 197.7	$ 320.0
Net gains (losses) on derivative instruments (net of tax of $(7.2), $29.3 and $5.0, respectively)	14.4	(105.4)	3.9
Reclassifications of net losses (gains) on derivative instruments (net of tax of $(10.3), $(14.6) and $1.5, respectively)	53.5	56.3	(19.0)
Foreign currency translation adjustments (net of tax of $(6.6), $2.8 and $4.5, respectively)	28.8	(20.6)	(14.0)
Foreign currency gains and (losses) on long-term intra-company transactions (net of tax of $(0.8), $0.7 and $0.4, respectively)	3.2	(1.7)	(0.8)
Benefit plans (net of tax of $(3.8), $6.0 and $(0.1), respectively)	5.3	(11.5)	0.1
Reclassifications of benefit plans actuarial losses and prior service costs to net income (net of tax of $(0.8), $(0.5) and $(0.4), respectively)	1.2	0.7	0.6
Other comprehensive income (loss)	106.4	(82.2)	(29.2)
Comprehensive income	534.0	115.5	290.8
(Deduct comprehensive income) add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners	(192.3)	38.6	(69.1)
Comprehensive income attributable to UGI Corporation	$ 341.7	$ 154.1	$ 221.7