Restatements of Condensed Consolidated Financial Statements - Condensed Consolidated Statement of Comprehensive income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net (loss) income	$ (12.7)	$ (22.8)	$ 592.6	$ 486.7
Net gains on derivative instruments, net of tax	(0.6)	(7.6)	46.2	(7.2)
Reclassification of net (gains) losses on derivative instruments, net of tax	(1.5)	9.7	(46.7)	52.3
Other comprehensive income	(2.1)	11.2	11.8	47.5
Comprehensive (loss) income	(14.8)	(11.6)	604.4	534.2
Add comprehensive loss (deduct comprehensive income) attributable to noncontrolling interests, principally in AmeriGas Partners	36.5	39.9	(230.4)	(214.0)
Comprehensive income attributable to UGI Corporation	21.7	28.3	374.0	320.2
As Previously Reported
Net (loss) income		(15.1)		481.8
Net gains on derivative instruments, net of tax		(11.0)		(11.1)
Reclassification of net (gains) losses on derivative instruments, net of tax		8.9		59.7
Other comprehensive income		7.0		51.0
Comprehensive (loss) income		(8.1)		532.8
Add comprehensive loss (deduct comprehensive income) attributable to noncontrolling interests, principally in AmeriGas Partners		37.8		(212.2)
Comprehensive income attributable to UGI Corporation		29.7		320.6
Adjustment
Net (loss) income		(7.7)		4.9
Net gains on derivative instruments, net of tax		3.4		3.9
Reclassification of net (gains) losses on derivative instruments, net of tax		0.8		(7.4)
Other comprehensive income		4.2		(3.5)
Comprehensive (loss) income		(3.5)		1.4
Add comprehensive loss (deduct comprehensive income) attributable to noncontrolling interests, principally in AmeriGas Partners		2.1		(1.8)
Comprehensive income attributable to UGI Corporation		$ (1.4)		$ (0.4)