Debt (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011	Aug. 31, 2011 6.25%, Due August 2019 [Member]	Sep. 30, 2012 Other [Member]	Sep. 30, 2011 Other [Member]	Sep. 30, 2012 AmeriGas Propane [Member]	Sep. 30, 2011 AmeriGas Propane [Member]	Sep. 30, 2012 AmeriGas Propane [Member] 7.00%, due May 2022 [Member]	Sep. 30, 2011 AmeriGas Propane [Member] 7.00%, due May 2022 [Member]	Sep. 30, 2012 AmeriGas Propane [Member] 6.75%, due May 2020 [Member]	Sep. 30, 2011 AmeriGas Propane [Member] 6.75%, due May 2020 [Member]	Sep. 30, 2012 AmeriGas Propane [Member] 6.50%, Due May 2021 [Member]	Sep. 30, 2011 AmeriGas Propane [Member] 6.50%, Due May 2021 [Member]	Sep. 30, 2012 AmeriGas Propane [Member] 6.25%, Due August 2019 [Member]	Sep. 30, 2011 AmeriGas Propane [Member] 6.25%, Due August 2019 [Member]	Sep. 30, 2012 AmeriGas Propane [Member] HOLP Senior Secured Notes [Member]	Sep. 30, 2012 AmeriGas Propane [Member] Other [Member]	Sep. 30, 2011 AmeriGas Propane [Member] Other [Member]	Sep. 30, 2012 International Propane [Member]	Sep. 30, 2011 International Propane [Member]	Sep. 30, 2012 International Propane [Member] Antargaz 2011 Senior Facilities term loan due March 2016 [Member]	Sep. 30, 2011 International Propane [Member] Antargaz 2011 Senior Facilities term loan due March 2016 [Member]	Sep. 30, 2012 International Propane [Member] Flaga term loan due through September 2016 [Member]	Sep. 30, 2011 International Propane [Member] Flaga term loan due through September 2016 [Member]	Sep. 30, 2012 International Propane [Member] Flaga term loan due October 2016 [Member]	Sep. 30, 2011 International Propane [Member] Flaga term loan due October 2016 [Member]	Sep. 30, 2011 International Propane [Member] Flaga term loan due through June 2014 [Member]	Sep. 30, 2012 International Propane [Member] Other [Member]	Sep. 30, 2011 International Propane [Member] Other [Member]	Sep. 30, 2012 UGI Utilities [Member]	Sep. 30, 2011 UGI Utilities [Member]	Sep. 30, 2012 UGI Utilities [Member] 6.375%, due September 2013 [Member]	Sep. 30, 2011 UGI Utilities [Member] 6.375%, due September 2013 [Member]	Sep. 30, 2012 UGI Utilities [Member] 5.75%, due September 2016 [Member]	Sep. 30, 2011 UGI Utilities [Member] 5.75%, due September 2016 [Member]	Sep. 30, 2012 UGI Utilities [Member] 6.21%, due September 2036 [Member]	Sep. 30, 2011 UGI Utilities [Member] 6.21%, due September 2036 [Member]	Sep. 30, 2012 UGI Utilities [Member] 5.53%, due September 2012 [Member]	Sep. 30, 2011 UGI Utilities [Member] 5.53%, due September 2012 [Member]	Sep. 30, 2012 UGI Utilities [Member] 5.37%, due August 2013 [Member]	Sep. 30, 2011 UGI Utilities [Member] 5.37%, due August 2013 [Member]	Sep. 30, 2012 UGI Utilities [Member] 5.16%, due May 2015 [Member]	Sep. 30, 2011 UGI Utilities [Member] 5.16%, due May 2015 [Member]	Sep. 30, 2012 UGI Utilities [Member] 7.37%, due October 2015 [Member]	Sep. 30, 2011 UGI Utilities [Member] 7.37%, due October 2015 [Member]	Sep. 30, 2012 UGI Utilities [Member] 5.64%, due December 2015 [Member]	Sep. 30, 2011 UGI Utilities [Member] 5.64%, due December 2015 [Member]	Sep. 30, 2012 UGI Utilities [Member] 6.17%, due June 2017 [Member]	Sep. 30, 2011 UGI Utilities [Member] 6.17%, due June 2017 [Member]	Sep. 30, 2012 UGI Utilities [Member] 7.25%, due November 2017 [Member]	Sep. 30, 2011 UGI Utilities [Member] 7.25%, due November 2017 [Member]	Sep. 30, 2012 UGI Utilities [Member] 5.67%, due January 2018 [Member]	Sep. 30, 2011 UGI Utilities [Member] 5.67%, due January 2018 [Member]	Sep. 30, 2012 UGI Utilities [Member] 6.50%, due August 2033 [Member]	Sep. 30, 2011 UGI Utilities [Member] 6.50%, due August 2033 [Member]	Sep. 30, 2012 UGI Utilities [Member] 6.13%, due October 2034 [Member]	Sep. 30, 2011 UGI Utilities [Member] 6.13%, due October 2034 [Member]
Long-Term Debt
Carrying value long-term debt	$ 3,514.3	$ 2,157.7		$ 12.4	$ 12.9	$ 2,328.0	$ 933.5	$ 980.8	$ 0	$ 550.0	$ 0	$ 270.0	$ 470.0	$ 450.0	$ 450.0	$ 55.6	$ 21.6	$ 13.5	$ 573.9	$ 571.3	$ 488.7	$ 508.7	$ 51.4	$ 53.5	$ 24.6	$ 0	$ 5.6	$ 5.6	$ 3.5	$ 600.0	$ 640.0	$ 108.0	$ 108.0	$ 175.0	$ 175.0	$ 100.0	$ 100.0	$ 0	$ 40.0	$ 25.0	$ 25.0	$ 20.0	$ 20.0	$ 22.0	$ 22.0	$ 50.0	$ 50.0	$ 20.0	$ 20.0	$ 20.0	$ 20.0	$ 20.0	$ 20.0	$ 20.0	$ 20.0	$ 20.0	$ 20.0
Less: current maturities	(166.7)	(47.4)
Total long-term debt due after one year	$ 3,347.6	$ 2,110.3
Interest rate stated percentage			6.25%					7.00%		6.75%		6.50%		6.25%																		6.375%		5.75%		6.21%		5.53%		5.37%		5.16%		7.37%		5.64%		6.17%		7.25%		5.67%		6.50%		6.13%