Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts receivable, allowances for doubtful accounts	$ 29.2	$ 27.3	$ 30.6
Property, plant and equipment, accumulated depreciation and amortization	$ 3,139.8	$ 3,107.3	$ 2,896.9
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	173,903,191	173,894,141	173,825,741