Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 311.8	$ 408.0	$ 602.7	$ 575.9
Other comprehensive income (loss):
Net (losses) gains on derivative instruments (net of tax of $0.3, $18.5, $(5.7) and $14.3, respectively)	(0.5)	(29.7)	11.8	(22.9)
Reclassifications of net gains on derivative instruments (net of tax of $2.5, $2.7, $4.6 and $5.9, respectively)	(5.4)	(4.3)	(9.9)	(9.6)
Foreign currency adjustments	17.8	46.7	(53.1)	16.5
Benefit plans (net of tax of $(0.3), $(0.1), $(0.9) and $(0.4), respectively)	0.4	0.3	1.4	0.7
Other comprehensive income (loss)	12.3	13.0	(49.8)	(15.3)
Comprehensive income including noncontrolling interests	324.1	421.0	552.9	560.6
Deduct comprehensive income attributable to noncontrolling interests, principally in AmeriGas Partners	(91.9)	(174.8)	(152.1)	(228.1)
Comprehensive income attributable to UGI Corporation	$ 232.2	$ 246.2	$ 400.8	$ 332.5