CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss) including noncontrolling interests	$ 84.7	$ (46.5)	$ 522.3	$ 438.7
Other comprehensive income (loss):
Net losses on derivative instruments (net of tax of $3.1, $0.6, $15.0, and $2.0, respectively)	(7.6)	(1.6)	(37.6)	(4.3)
Reclassifications of net losses on derivative instruments (net of tax of $(1.9), $(0.2), $(2.4), and $(0.5), respectively)	4.7		6.0
Reclassifications of net losses on derivative instruments (net of tax of $(1.9), $(0.2), $(2.4), and $(0.5), respectively)		0.7		1.4
Foreign currency adjustments (net of tax of $4.0, $2.7, $4.1, and $(2.2), respectively)	27.6	16.1	41.9	(26.3)
Benefit plans (net of tax of $(0.1), $(0.1), $(0.6), and $(0.3), respectively)	0.4	0.2	1.7	0.8
Other comprehensive income (loss)	25.1	15.4	12.0	(28.4)
Comprehensive income (loss) including noncontrolling interests	109.8	(31.1)	534.3	410.3
Add comprehensive loss (deduct comprehensive income) attributable to noncontrolling interests, principally in AmeriGas Partners prior to the AmeriGas Merger	0.6	44.6	0.5	(131.0)
Comprehensive income attributable to UGI Corporation	$ 110.4	$ 13.5	$ 534.8	$ 279.3