Revisions and Restatements of Consolidated Financial Statements - Statements of Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Net income	$ (59.1)	$ (22.8)	$ 341.7	$ 167.8	$ (68.4)	$ (61.8)	$ 231.9	$ 96.0	$ 427.6	$ 197.7	$ 320.0
Net gains (losses) on derivative instruments, net of tax									14.4	(105.4)	3.9
Reclassifications of net gains (losses) on derivative instruments									53.5	56.3	(19.0)
Comprehensive income									534.0	115.5	290.8
Comprehensive income attributable to UGI Corporation									341.7	154.1	221.7
As Previously Reported
Net income		(15.1)	326.2	170.7	(74.0)	(76.5)	227.0	110.1		186.6	308.2
Net gains (losses) on derivative instruments, net of tax										(127.1)	(10.8)
Reclassifications of net gains (losses) on derivative instruments										87.9	11.8
Comprehensive income										114.3	295.1
Comprehensive income attributable to UGI Corporation										153.2	225.3
Adjustment
Net income		(7.7)	15.5	(2.9)	5.6	14.7	4.9	(14.1)		11.1	11.8
Net gains (losses) on derivative instruments, net of tax										21.7	14.7
Reclassifications of net gains (losses) on derivative instruments										(31.6)	(30.8)
Comprehensive income										1.2	(4.3)
Comprehensive income attributable to UGI Corporation										$ 0.9	$ (3.6)