Utility Regulatory Assets and Liabilities and Regulatory Matters (Details) - UGI Utilities - USD ($) $ in Millions	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019
Regulatory Assets
Regulatory assets	$ 398.6	$ 395.6	$ 300.6
Regulatory Liabilities
Regulatory liabilities	357.6	358.8	376.2
Postretirement benefit overcollections
Regulatory Liabilities
Regulatory liabilities	13.4	14.5	16.5
Deferred fuel and power refunds
Regulatory Liabilities
Regulatory liabilities	27.9	6.1	12.4
State tax benefits — distribution system repairs
Regulatory Liabilities
Regulatory liabilities	29.0	25.0	25.2
PAPUC temporary rates order
Regulatory Liabilities
Regulatory liabilities	10.0	31.3	25.4
Excess federal deferred income taxes
Regulatory Liabilities
Regulatory liabilities	275.3	279.5	282.7
Other
Regulatory Liabilities
Regulatory liabilities	2.0	2.4	14.0
Income taxes recoverable
Regulatory Assets
Regulatory assets	133.3	115.2	123.9
Underfunded pension and postretirement plans
Regulatory Assets
Regulatory assets	168.5	178.6	81.8
Environmental costs
Regulatory Assets
Regulatory assets	61.8	59.5	56.6
Removal costs, net
Regulatory Assets
Regulatory assets	22.1	28.3	29.3
Other
Regulatory Assets
Regulatory assets	$ 12.9	$ 14.0	$ 9.0