Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 532.6	$ 427.6	$ 197.7
Net gains (losses) on derivative instruments (net of tax of $(12.2), $(7.2) and $29.3, respectively)	54.0	14.4	(105.4)
Reclassifications of net (gains) losses on derivative instruments (net of tax of $2.0, $(10.3) and $(14.6), respectively)	(45.2)	53.5	56.3
Foreign currency translation adjustments (net of tax of $13.8, $(6.6) and $2.8, respectively)	(23.2)	28.8	(20.6)
Foreign currency (losses) gains on long-term intra-company transactions (net of tax of $10.6, $(0.8) and $0.7, respectively)	(19.8)	3.2	(1.7)
Benefit plans (net of tax of $2.6, $(3.8) and $6.0, respectively)	(5.2)	5.3	(11.5)
Reclassifications of benefit plans actuarial losses and prior service costs to net income (net of tax of $(0.6), $(0.8) and $(0.5), respectively)	1.0	1.2	0.7
Other comprehensive (loss) income	(38.4)	106.4	(82.2)
Comprehensive income	494.2	534.0	115.5
(Deduct comprehensive income) add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners	(186.6)	(192.3)	38.6
Comprehensive income attributable to UGI Corporation	$ 307.6	$ 341.7	$ 154.1