Condensed Consolidated Statements of Changes in Equity (unaudited) - USD ($) $ in Millions	Total	Total UGI Corporation stockholders’ equity	Common stock, without par value	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting for employee share-based payments				$ 5.0
Balance, beginning of period at Sep. 30, 2016			$ 1,201.6	1,840.9	$ (154.7)	$ (36.9)	$ 750.9
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans (including losses on treasury stock transactions), net of tax withheld			(1.2)
Equity-based compensation expense			1.6
Sale of treasury stock			1.4			0.2
Net income	$ 290.9			230.7			60.2
Cash dividends on Common Stock				(41.2)
Net (losses) gains on derivative instruments	12.3				12.3
Reclassification of net gains on derivative instruments	(4.5)				(4.5)
Benefit plans	1.0				1.0
Foreign currency adjustments	(70.9)				(70.9)
Common stock issued in connection with employee and director plans, net of tax withheld						2.8
Repurchases of Common Stock						0.0
Reacquired common stock — employee and director plans						(0.4)
Dividends and distributions							(65.0)
Other							(0.7)
Balance, end of period at Dec. 31, 2016	3,733.1	$ 2,987.7	1,203.4	2,035.4	(216.8)	(34.3)	745.4
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting for employee share-based payments				0.0
Balance, beginning of period at Sep. 30, 2017	3,740.9		1,188.6	2,106.7	(93.4)	(38.6)	577.6
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans (including losses on treasury stock transactions), net of tax withheld			(1.3)
Equity-based compensation expense			2.0
Sale of treasury stock			0.0			0.0
Net income	434.2			365.9			68.3
Cash dividends on Common Stock				(43.3)
Net (losses) gains on derivative instruments	(0.4)				(0.4)
Reclassification of net gains on derivative instruments	(0.4)				(0.4)
Benefit plans	0.4				0.4
Foreign currency adjustments	22.3				22.3
Common stock issued in connection with employee and director plans, net of tax withheld						2.7
Repurchases of Common Stock						(9.5)
Reacquired common stock — employee and director plans						0.0
Dividends and distributions							(65.7)
Other							0.2
Balance, end of period at Dec. 31, 2017	$ 4,082.1	$ 3,501.7	$ 1,189.3	$ 2,429.3	$ (71.5)	$ (45.4)	$ 580.4