Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable, allowances for doubtful accounts	$ 30.6	$ 29.7	$ 37.9
Property, plant and equipment, accumulated depreciation and amortization	$ 2,896.4	$ 2,835.0	$ 2,664.2
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	173,825,741	173,806,991	173,772,391