Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 290.9	$ 167.9
Other comprehensive income (loss):
Net gains on derivative instruments (net of tax of $(6.0) and $(4.2), respectively)	12.3	6.8
Reclassifications of net gains on derivative instruments (net of tax of $2.1 and $3.2, respectively)	(4.5)	(5.3)
Foreign currency adjustments	(70.9)	(30.2)
Benefit plans (net of tax of $(0.6) and $(0.3), respectively)	1.0	0.4
Other comprehensive loss	(62.1)	(28.3)
Comprehensive income including noncontrolling interests	228.8	139.6
Deduct comprehensive income attributable to noncontrolling interests, principally in AmeriGas Partners	(60.2)	(53.3)
Comprehensive income attributable to UGI Corporation	$ 168.6	$ 86.3