Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011	Mar. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances for doubtful accounts	$ 44.2	$ 36.8	$ 46.1
Property, plant and equipment, accumulated depreciation and amortization	$ 2,186.3	$ 2,080.0	$ 2,026.6
UGI Common Stock, without par value
UGI Common Stock, without par value, shares authorized	300,000,000	300,000,000	300,000,000
UGI Common Stock, without par value, shares issued	115,616,094	115,507,094	115,501,094