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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Gas Utility and Electric Utility (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Regulatory Assets And Liabilities      
Regulatory assets $ 345.3 $ 304.2 $ 254.2
Regulatory liabilities [1] 69.9 71.0 77.5
Postretirement benefits      
Regulatory Assets And Liabilities      
Regulatory liabilities [1] 19.7 20.0 19.6
Deferred fuel and power refunds      
Regulatory Assets And Liabilities      
Regulatory liabilities [1] 34.4 36.6 45.6
State tax benefits—distribution system repairs      
Regulatory Assets And Liabilities      
Regulatory liabilities [1] 14.6 13.3 10.9
Other      
Regulatory Assets And Liabilities      
Regulatory liabilities [1] 1.2 1.1 1.4
Income taxes recoverable      
Regulatory Assets And Liabilities      
Regulatory assets 119.6 115.9 111.8
Underfunded pension and postretirement plans      
Regulatory Assets And Liabilities      
Regulatory assets 133.4 140.8 103.2
Environmental costs      
Regulatory Assets And Liabilities      
Regulatory assets [2] 60.7 20.0 14.5
Removal costs, net      
Regulatory Assets And Liabilities      
Regulatory assets 22.4 21.2 19.6
Other      
Regulatory Assets And Liabilities      
Regulatory assets $ 9.2 $ 6.3 $ 5.1
[1] Regulatory liabilities are recorded in other current and other noncurrent liabilities on the Condensed Consolidated Balance Sheets.
[2] Environmental costs at June 30, 2016, include amounts probable of recovery recorded in conjunction with UGI Gas’ Consent Order and Agreement with the Pennsylvania Department of Environmental Protection (see Note 9).