Consolidated Statements of Comprehensive Income (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 308.2	$ 355.7	$ 382.0
Net losses on derivative instruments (net of tax of $(15.4), $(29.2) and $82.1, respectively)	(10.8)	(16.8)	(204.1)
Reclassifications of net losses on derivative instruments (net of tax of $(20.4), $(25.3) and $(78.6), respectively)	11.8	22.9	225.0
Foreign currency translation adjustments (net of tax of $4.5, $7.9 and $(8.4), respectively)	(14.0)	(39.4)	29.5
Foreign currency gain and losses on long-term intra -company transaction (net of tax of $ 0.4)	(0.8)
Benefit plans (net of tax of $(0.1), $12.7 and $31.1, respectively)	0.1	(18.7)	(44.4)
Reclassification of benefit plans actuarial losses and prior service costs (net of tax of $(0.4), $(2.9) and $(1.6), respectively) to net income	0.6	4.2	2.3
Reclassification of pension plans actuarial losses and prior service costs (net of tax of $(59.1)) to regulatory assets	0	83.3	0
Comprehensive income	295.1	391.2	390.3
Less: comprehensive income attributable to noncontrolling interests, principally in AmeriGas Partners	(69.8)	(101.4)	(155.5)
Comprehensive income attributable to UGI Corporation	$ 225.3	$ 289.8	$ 234.8