Utility Regulatory Assets and Liabilities and Regulatory Matters Schedule of Regulatory Assets and Liabilities (Details) - UGI Utilities - USD ($) $ in Millions	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Regulatory Assets
Regulatory assets	$ 390.5	$ 395.6	$ 298.8
Regulatory Liabilities
Regulatory liabilities	351.2	358.8	373.5
Postretirement benefit overcollections
Regulatory Liabilities
Regulatory liabilities	14.1	14.5	17.3
Deferred fuel and power refunds
Regulatory Liabilities
Regulatory liabilities	6.3	6.1	22.2
State tax benefits — distribution system repairs
Regulatory Liabilities
Regulatory liabilities	26.3	25.0	23.5
PAPUC Temporary Rates Order
Regulatory Liabilities
Regulatory liabilities	25.0	31.3	24.8
Excess federal deferred income taxes
Regulatory Liabilities
Regulatory liabilities	278.1	279.5	280.9
Other
Regulatory Liabilities
Regulatory liabilities	1.4	2.4	4.8
Income taxes recoverable
Regulatory Assets
Regulatory assets	121.2	115.2	115.2
Underfunded pension and postretirement plans
Regulatory Assets
Regulatory assets	175.2	178.6	85.3
Environmental costs
Regulatory Assets
Regulatory assets	57.5	59.5	58.5
Removal costs, net
Regulatory Assets
Regulatory assets	26.7	28.3	31.3
Other
Regulatory Assets
Regulatory assets	$ 9.9	$ 14.0	$ 8.5