Inventories (Details Textual) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013 Storage_Agreement	Sep. 30, 2012 ft3	Mar. 31, 2012	Dec. 31, 2011 ft3
Public Utilities, Inventory [Line Items]
Number Of Storage Agreements	3
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet)		3,800,000,000		600,000,000
Carrying value of gas storage inventories released under SCAAs with non-affiliates		$ 11.4	$ 2.9
UGI Utilities [Member] | Expires in October 2013 [Member]
Public Utilities, Inventory [Line Items]
Number Of Storage Agreements	1
UGI Utilities [Member] | Expires in October 2015 [Member]
Public Utilities, Inventory [Line Items]
Number Of Storage Agreements	2