Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 414.0	$ 532.6	$ 427.6
Net gains (losses) on derivative instruments (net of tax of $(8.0), $(12.2) and $(7.2), respectively)	16.8	54.0	14.4
Reclassifications of net losses (gains) on derivative instruments (net of tax of $(2.8), $2.0 and $(10.3), respectively)	1.6	(45.2)	53.5
Foreign currency translation adjustments (net of tax of $(1.0), $13.8 and $(6.6), respectively)	(63.5)	(23.2)	28.8
Foreign currency (losses) gains on long-term intra-company transactions (net of tax of $(6.7), $10.6 and $(0.8), respectively)	(50.6)	(19.8)	3.2
Benefit plans (net of tax of $1.4, $2.6 and $(3.8), respectively)	(1.2)	(5.2)	5.3
Reclassifications of benefit plans actuarial losses and prior service costs(net of tax of $(0.8), $(0.6) and $(0.8), respectively)	1.4	1.0	1.2
Other comprehensive (loss) income	(95.5)	(38.4)	106.4
Comprehensive income including noncontrolling interests	318.5	494.2	534.0
Deduct comprehensive income attributable to noncontrolling interests, principally in AmeriGas Partners	(130.9)	(186.6)	(192.3)
Comprehensive income attributable to UGI Corporation	$ 187.6	$ 307.6	$ 341.7