Debt (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010
Long-Term Debt
Carrying value long-term debt	$ 2,157.7	$ 2,005.8
Less: current maturities	(47.4)	(573.6)
Total long-term debt due after one year	2,110.3	1,432.2
AmeriGas Propane [Member]
Long-Term Debt
Carrying value long-term debt	933.5	791.4
AmeriGas Propane [Member] | 6.50%, Due May 2021 [Member]
Long-Term Debt
Carrying value long-term debt	470.0	0
AmeriGas Propane [Member] | 6.25%, Due August 2019 [Member]
Long-Term Debt
Carrying value long-term debt	450.0	0
AmeriGas Propane [Member] | 8.875%, Due May 2011 [Member]
Long-Term Debt
Carrying value long-term debt	0	14.7
AmeriGas Propane [Member] | 7.25%, Due, May 2015 [Member]
Long-Term Debt
Carrying value long-term debt	0	415.0
AmeriGas Propane [Member] | 7.125%, Due May 2016 [Member]
Long-Term Debt
Carrying value long-term debt	0	350.0
AmeriGas Propane [Member] | Other [Member]
Long-Term Debt
Carrying value long-term debt	13.5	11.7
6.375% Notes, due September 2013 [Member] | UGI Utilities [Member]
Long-Term Debt
Carrying value long-term debt	108.0	108.0
UGI Utilities [Member]
Long-Term Debt
Carrying value long-term debt	640.0	640.0
UGI Utilities [Member] | 5.75%, due September 2016 [Member]
Long-Term Debt
Carrying value long-term debt	175.0	175.0
UGI Utilities [Member] | 6.21%, due September 2036 [Member]
Long-Term Debt
Carrying value long-term debt	100.0	100.0
UGI Utilities [Member] | 5.53% Notes, due September 2012 [Member]
Long-Term Debt
Carrying value long-term debt	40.0	40.0
UGI Utilities [Member] | 5.37% Notes, due August 2013 [Member]
Long-Term Debt
Carrying value long-term debt	25.0	25.0
UGI Utilities [Member] | 5.16% Notes, due May 2015 [Member]
Long-Term Debt
Carrying value long-term debt	20.0	20.0
UGI Utilities [Member] | 7.37% Notes, due October 2015 [Member]
Long-Term Debt
Carrying value long-term debt	22.0	22.0
UGI Utilities [Member] | 5.64% Notes, due December 2015 [Member]
Long-Term Debt
Carrying value long-term debt	50.0	50.0
UGI Utilities [Member] | 6.17% Notes, due June 2017 [Member]
Long-Term Debt
Carrying value long-term debt	20.0	20.0
UGI Utilities [Member] | 7.25% Notes, due November 2017 [Member]
Long-Term Debt
Carrying value long-term debt	20.0	20.0
UGI Utilities [Member] | 5.67% Notes, due January 2018 [Member]
Long-Term Debt
Carrying value long-term debt	20.0	20.0
UGI Utilities [Member] | 6.50% Notes, due August 2033 [Member]
Long-Term Debt
Carrying value long-term debt	20.0	20.0
UGI Utilities [Member] | 6.13% Notes, due October 2034 [Member]
Long-Term Debt
Carrying value long-term debt	20.0	20.0
International Propane [Member]
Long-Term Debt
Carrying value long-term debt	571.3	561.1
International Propane [Member] | Antargaz 2011 Senior Facilities term loan due March 2016 [Member]
Long-Term Debt
Carrying value long-term debt	508.7	0
International Propane [Member] | Antargaz Senior Facilities term loan due March 2011 [Member]
Long-Term Debt
Carrying value long-term debt	0	518.1
International Propane [Member] | Flaga term loan due through September 2016 [Member]
Long-Term Debt
Carrying value long-term debt	53.5	0
International Propane [Member] | Flaga term loan due through September 2011 [Member]
Long-Term Debt
Carrying value long-term debt	0	32.7
International Propane [Member] | Flaga term loan due through June 2014 [Member]
Long-Term Debt
Carrying value long-term debt	5.6	7.6
International Propane [Member] | International Propane, Other [Member]
Long-Term Debt
Carrying value long-term debt	3.5	2.7
Other Long Term Debt [Member]
Long-Term Debt
Carrying value long-term debt	$ 12.9	$ 13.3