Condensed Financial Information of Registrant (Parent Company) (Details) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Current assets
Cash and cash equivalents	$ 389.3	$ 319.9	$ 238.5	$ 260.7
Deferred income taxes	10.6	29.8
Total current assets	1,627.3	1,470.4
Other assets	419.7	495.6
Total assets	10,008.8	9,676.9	6,660.9
Current liabilities
Derivative financial instruments	30.0	100.9
Total current liabilities	1,424.9	1,482.3
Commitments and contingencies (Note 1)
Common stockholders’ equity:
UGI Common Stock, without par value (authorized - 300,000,000 shares; issued - 115,783,794 and 115,624,594 shares, respectively)	1,208.1	1,157.7
Retained earnings	1,308.3	1,156.0
Accumulated other comprehensive income (loss)	8.4	(55.2)
Treasury stock, at cost	(32.3)	(28.7)
Total UGI Corporation stockholders’ equity	2,492.5	2,229.8
Total liabilities and equity	10,008.8	9,676.9
Condensed financial information of registrant (Textual) [Abstract]
UGI Common Stock, without par value (in dollars per share)	$ 0	$ 0
UGI Common Stock, without par value authorized (in shares)	300,000,000	300,000,000
UGI Common Stock, without par value, issued (in shares)	115,783,794	115,624,594	115,507,094	115,400,294
Parent Company [Member]
Current assets
Cash and cash equivalents	0.9	1.9	0.4	1.0
Accounts and notes receivable	2.9	4.0
Deferred income taxes	0.4	0.4
Prepaid expenses and other current assets	0.3	0.3
Total current assets	4.5	6.6
Investments in subsidiaries	2,488.7	2,241.1
Other assets	49.9	28.3
Total assets	2,543.1	2,276.0
Current liabilities
Accounts and notes payable	11.0	11.1
Derivative financial instruments	0	0
Accrued liabilities	3.9	2.4
Total current liabilities	14.9	13.5
Noncurrent liabilities	35.7	32.7
Commitments and contingencies (Note 1)
Common stockholders’ equity:
UGI Common Stock, without par value (authorized - 300,000,000 shares; issued - 115,783,794 and 115,624,594 shares, respectively)	1,208.1	1,157.7
Retained earnings	1,308.3	1,156.0
Accumulated other comprehensive income (loss)	8.4	(55.2)
Treasury stock, at cost	(32.3)	(28.7)
Total UGI Corporation stockholders’ equity	2,492.5	2,229.8
Total liabilities and equity	$ 2,543.1	$ 2,276.0
Condensed financial information of registrant (Textual) [Abstract]
UGI Common Stock, without par value (in dollars per share)	$ 0	$ 0
UGI Common Stock, without par value authorized (in shares)	300,000,000	300,000,000
UGI Common Stock, without par value, issued (in shares)	115,783,794	115,624,594