Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011
Accounts receivable, allowances for doubtful accounts	$ 45.7	$ 36.8	$ 45.0
Property, plant and equipment, accumulated depreciation and amortization	$ 2,226.8	$ 2,080.0	$ 2,077.1
UGI Common Stock, without par value (in dollars per share)
UGI Common Stock, without par value, shares authorized (in shares)	300,000,000	300,000,000	300,000,000
UGI Common Stock, without par value, shares issued (in shares)	115,623,094	115,507,094	115,507,094