Commitments and Contingencies - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014 lb	Mar. 31, 2014 PNG MGP	Mar. 31, 2014 Environmental Matters CPG MGP	Mar. 31, 2014 Environmental Matters PNG MGP	Mar. 31, 2014 Environmental Matters UGI Utilities	Mar. 31, 2014 CPG and PNG COAs UGI Utilities	Mar. 31, 2013 CPG and PNG COAs UGI Utilities
Commitments and Contingencies
Environmental expenditures cap during calendar year			$ 1.8	$ 1.1
Loss Contingency, Settlement Agreement, Terms		P2Y
Accrual for environmental loss contingencies						$ 11.1	$ 14.3
Base year for determination of investigation and remediation cost (in years)					5 years
Amount of propane in cylinders before reduction	17
Amount of propane in cylinders after reduction	15