Utility Regulatory Assets and Liabilities and Regulatory Matters Schedule of Regulatory Assets and Liabilities (Details) - UGI Utilities - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019
Regulatory Assets
Regulatory assets	$ 390.9	$ 395.6	$ 299.3
Regulatory Liabilities
Regulatory liabilities	345.9	358.8	379.5
Postretirement benefit overcollections
Regulatory Liabilities
Regulatory liabilities	13.7	14.5	16.9
Deferred fuel and power refunds
Regulatory Liabilities
Regulatory liabilities	11.3	6.1	17.7
State tax benefits — distribution system repairs
Regulatory Liabilities
Regulatory liabilities	27.7	25.0	24.3
PAPUC Temporary Rates Order
Regulatory Liabilities
Regulatory liabilities	15.4	31.3	25.1
Excess federal deferred income taxes
Regulatory Liabilities
Regulatory liabilities	276.7	279.5	276.7
Other
Regulatory Liabilities
Regulatory liabilities	1.1	2.4	18.8
Income taxes recoverable
Regulatory Assets
Regulatory assets	127.3	115.2	120.3
Underfunded pension and postretirement plans
Regulatory Assets
Regulatory assets	171.8	178.6	83.6
Environmental costs
Regulatory Assets
Regulatory assets	56.8	59.5	58.8
Removal costs, net
Regulatory Assets
Regulatory assets	24.5	28.3	30.1
Other
Regulatory Assets
Regulatory assets	$ 10.5	$ 14.0	$ 6.5