CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income including noncontrolling interests	$ (46.5)	$ (11.7)	$ 438.7	$ 830.2
Other comprehensive income (loss):
Net (losses) gains on derivative instruments (net of tax of $0.6, $(1.5), $2.0 and $(0.6), respectively)	(1.6)	3.7	(4.3)	1.7
Reclassifications of net losses on derivative instruments (net of tax of $(0.2), $(0.2), $(0.5) and $(1.6), respectively)	0.7	0.2	1.4	2.6
Foreign currency adjustments (net of tax of $2.7, $0.0, $(2.2) and $(0.1), respectively)	16.1	(82.0)	(26.3)	(23.8)
Benefit plans (net of tax of $(0.1), $(0.2), $(0.3) and $(0.5), respectively)	0.2	0.6	0.8	1.3
Other comprehensive income (loss)	15.4	(77.5)	(28.4)	(18.2)
Comprehensive (loss) income including noncontrolling interests	(31.1)	(89.2)	410.3	812.0
Add comprehensive loss (deduct comprehensive income) attributable to noncontrolling interests, principally in AmeriGas Partners	44.6	64.1	(131.0)	(135.9)
Comprehensive income (loss) attributable to UGI Corporation	$ 13.5	$ (25.1)	$ 279.3	$ 676.1