Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income including noncontrolling interests	$ (62.2)	$ 28.6	$ 540.5	$ 604.5
Other comprehensive income (loss):
Net (losses) gains on derivative instruments (net of tax of $3.4, $(3.4), $(2.3) and $10.9, respectively)	(6.6)	7.8	5.2	(15.1)
Reclassifications of net (gains) losses on derivative instruments (net of tax of $(0.2), $(0.4), $4.4 and $5.5, respectively)	(0.2)	0.6	(10.1)	(9.0)
Foreign currency adjustments	75.5	(35.4)	22.4	(18.9)
Benefit plans (net of tax of $0.0, $(0.3), $(0.9) and $(0.7), respectively)	(0.1)	0.3	1.3	1.0
Other comprehensive income (loss)	68.6	(26.7)	18.8	(42.0)
Comprehensive income including noncontrolling interests	6.4	1.9	559.3	562.5
Add comprehensive loss (deduct comprehensive income) attributable to noncontrolling interests, principally in AmeriGas Partners	43.2	32.1	(108.9)	(196.0)
Comprehensive income attributable to UGI Corporation	$ 49.6	$ 34.0	$ 450.4	$ 366.5