Long-term Debt - Schedule of Long-term Debt Instruments (Details) $ in Millions	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)	May. 29, 2015 EUR (€)	May. 29, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jan. 12, 2012
Debt Instrument
Total long-term debt		$ 3,699.8			$ 3,510.8
Less: current maturities		(258.0)			(77.2)
Total long-term debt due after one year		3,441.8			3,433.6
AmeriGas Propane
Debt Instrument
Total long-term debt		2,283.5			2,291.7
AmeriGas Propane | Other
Debt Instrument
Total long-term debt		11.7			14.4
AmeriGas Propane | Senior Notes | 7.00% Senior Notes, due 2022
Debt Instrument
Total long-term debt		$ 980.8			$ 980.8
Stated interest rate (percentage)	7.00%	7.00%			7.00%	7.00%
AmeriGas Propane | Senior Notes | 6.75% Senior Notes, due 2020
Debt Instrument
Total long-term debt		$ 550.0			$ 550.0
Stated interest rate (percentage)	6.75%	6.75%			6.75%	6.75%
AmeriGas Propane | Senior Notes | 6.50% Senior Notes, due 2021
Debt Instrument
Total long-term debt		$ 270.0			$ 270.0
Stated interest rate (percentage)	6.50%	6.50%			6.50%
AmeriGas Propane | Senior Notes | 6.25% Senior Notes, due 2019
Debt Instrument
Total long-term debt		$ 450.0			$ 450.0
Stated interest rate (percentage)	6.25%	6.25%			6.25%
AmeriGas Propane | Senior Secured Notes | HOLP Senior Secured Notes
Debt Instrument
Total long-term debt		$ 21.0			$ 26.5
UGI International
Debt Instrument
Total long-term debt		782.8			565.0
UGI International | Other | Other
Debt Instrument
Total long-term debt		1.8			6.4
France SAS | Term Loan | 2015 Senior Facilities Agreement
Debt Instrument
Total long-term debt		670.7	€ 600,000,000	$ 659.6	0.0
Antargaz | Term Loan | 2011 Senior Facilities Agreement
Debt Instrument
Total long-term debt		0.0			432.0
Flaga | Term Loan | Flaga Term Loan, due September 2018
Debt Instrument
Total long-term debt		59.1			0.0
Flaga | Term Loan | Flaga Term Loan
Debt Instrument
Total long-term debt		0.0			52.0
Flaga | Term Loan | Flaga Term Loan, due through August 2016
Debt Instrument
Total long-term debt	€ 26,700,000	29.8			50.5
Flaga | Term Loan | Flaga Term Loan, due October 2016
Debt Instrument
Total long-term debt	€ 19,100,000	21.4			24.1
UGI Utilities
Debt Instrument
Total long-term debt		622.0			642.0
UGI Utilities | Senior Notes | 5.75% Senior Notes, due 2016
Debt Instrument
Total long-term debt		$ 175.0			$ 175.0
Stated interest rate (percentage)	5.75%	5.75%			5.75%
UGI Utilities | Senior Notes | 4.98% Senior Notes, due 2044
Debt Instrument
Total long-term debt		$ 175.0			$ 175.0
Stated interest rate (percentage)	4.98%	4.98%			4.98%
UGI Utilities | Senior Notes | 6.21% Senior Notes, due 2036
Debt Instrument
Total long-term debt		$ 100.0			$ 100.0
Stated interest rate (percentage)	6.21%	6.21%			6.21%
UGI Utilities | Medium-term Notes | 5.16% Medium-term Notes, due May 2015
Debt Instrument
Total long-term debt		$ 0.0			$ 20.0
Stated interest rate (percentage)	5.16%	5.16%			5.16%
UGI Utilities | Medium-term Notes | 7.37% Medium-term Notes, due October 2015
Debt Instrument
Total long-term debt		$ 22.0			$ 22.0
Stated interest rate (percentage)	7.37%	7.37%			7.37%
UGI Utilities | Medium-term Notes | 5.64% Medium-term Notes, due December 2015
Debt Instrument
Total long-term debt		$ 50.0			$ 50.0
Stated interest rate (percentage)	5.64%	5.64%			5.64%
UGI Utilities | Medium-term Notes | 6.17% Medium-term Notes, due June 2017
Debt Instrument
Total long-term debt		$ 20.0			$ 20.0
Stated interest rate (percentage)	6.17%	6.17%			6.17%
UGI Utilities | Medium-term Notes | 7.25% Medium-term Notes, due November 2017
Debt Instrument
Total long-term debt		$ 20.0			$ 20.0
Stated interest rate (percentage)	7.25%	7.25%			7.25%
UGI Utilities | Medium-term Notes | 5.67% Medium-term Notes, due 2018
Debt Instrument
Total long-term debt		$ 20.0			$ 20.0
Stated interest rate (percentage)	5.67%	5.67%			5.67%
UGI Utilities | Medium-term Notes | 6.50% Medium-term Notes, due 2033
Debt Instrument
Total long-term debt		$ 20.0			$ 20.0
Stated interest rate (percentage)	6.50%	6.50%			6.50%
UGI Utilities | Medium-term Notes | 6.13% Medium-term Notes, due 2034
Debt Instrument
Total long-term debt		$ 20.0			$ 20.0
Stated interest rate (percentage)	6.13%	6.13%			6.13%
Other
Debt Instrument
Total long-term debt		$ 11.5			$ 12.1