Utility Regulatory Assets and Liabilities and Regulatory Matters (Details) - UGI Utilities - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Regulatory Assets
Regulatory assets	$ 300.6	$ 301.0	$ 360.1
Regulatory Liabilities
Regulatory liabilities	376.2	390.2	412.5
Postretirement benefits
Regulatory Liabilities
Regulatory liabilities	16.5	17.8	16.9
Deferred fuel and power refunds
Regulatory Liabilities
Regulatory liabilities	12.4	36.7	44.5
State tax benefits — distribution system repairs
Regulatory Liabilities
Regulatory liabilities	25.2	22.6	20.7
PAPUC temporary rates order
Regulatory Liabilities
Regulatory liabilities	25.4	24.4	24.1
Excess federal deferred income taxes
Regulatory Liabilities
Regulatory liabilities	282.7	285.2	301.2
Other
Regulatory Liabilities
Regulatory liabilities	14.0	3.5	5.1
Income taxes recoverable
Regulatory Assets
Regulatory assets	123.9	110.1	130.0
Underfunded pension and postretirement plans
Regulatory Assets
Regulatory assets	81.8	87.1	132.2
Environmental costs
Regulatory Assets
Regulatory assets	56.6	58.8	59.8
Removal costs, net
Regulatory Assets
Regulatory assets	29.3	32.0	31.0
Other
Regulatory Assets
Regulatory assets	$ 9.0	$ 13.0	$ 7.1