Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Statement of Financial Position [Abstract]
Accounts receivable, allowances for doubtful accounts	$ 32.1	$ 29.7	$ 40.3
Property, plant and equipment, accumulated depreciation and amortization	$ 3,037.9	$ 2,835.0	$ 2,773.6
UGI Common Stock, without par value, shares authorized	450,000,000	450,000,000	450,000,000
UGI Common Stock, without par value, shares issued	173,875,641	173,806,991	173,806,991