Commitments and Contingencies (Details) $ in Millions	1 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($)	Jan. 31, 2015 USD ($)	Oct. 31, 2014 lawsuit	Jun. 30, 2017 USD ($) subsidiary lb	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)
Loss Contingencies
Amount awarded		$ 18.0
Adjustment to litigation accrual	$ 15.0
Class action lawsuits (more than) | lawsuit			35
Amount of propane in cylinders before reduction (in pounds) | lb				17
Amount of propane in cylinders after reduction (in pounds) | lb				15
UGI Gas | Environmental Matters
Loss Contingencies
Environmental expenditures cap during calendar year				$ 2.5
CPG MGP | Environmental Matters
Loss Contingencies
Environmental expenditures cap during calendar year				1.8
PNG MGP | Environmental Matters
Loss Contingencies
Environmental expenditures cap during calendar year				$ 1.1
PNG-COA
Loss Contingencies
Loss contingency, settlement agreement, terms				2 years
CPG, PNG and UGI Gas COAs
Loss Contingencies
Accrual for environmental loss contingencies	$ 55.1			$ 55.2		$ 56.0
UGI Utilities | PNG and CPG
Loss Contingencies
Number of subsidiaries acquired with similar histories | subsidiary				2
AmeriGas OLP | Saranac Lake, New York | New York State Department of Environment Conservation Remediation Plan
Loss Contingencies
Accrual for environmental loss contingencies				$ 7.5
Estimated remediation plan cost					$ 27.0