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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Utilities (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Regulatory Assets and Liabilities    
Regulatory assets $ 395.1 $ 304.2
Regulatory liabilities [1] 55.6 71.0
Postretirement Benefit Overcollections    
Regulatory Assets and Liabilities    
Regulatory liabilities [1] 17.5 20.0
Deferred Fuel and Power Refunds    
Regulatory Assets and Liabilities    
Regulatory liabilities [1] 22.3 36.6
State Income Tax Benefits — Distribution System Repairs    
Regulatory Assets and Liabilities    
Regulatory liabilities [1] 15.1 13.3
Other    
Regulatory Assets and Liabilities    
Regulatory liabilities [1] 0.7 1.1
Income Taxes Recoverable    
Regulatory Assets and Liabilities    
Regulatory assets 115.7 115.9
Underfunded Pension and Postretirement Plans    
Regulatory Assets and Liabilities    
Regulatory assets 183.1 140.8
Environmental Costs    
Regulatory Assets and Liabilities    
Regulatory assets [2] 59.4 20.0
Removal Costs, Net    
Regulatory Assets and Liabilities    
Regulatory assets 27.9 21.2
Other    
Regulatory Assets and Liabilities    
Regulatory assets $ 9.0 $ 6.3
[1] Regulatory liabilities are recorded in other current and other noncurrent liabilities on the Consolidated Balance Sheets.
[2] Balance at September 30, 2016, includes amounts associated with UGI Gas’ Consent Order and Agreement with the Pennsylvania Department of Environmental Protection (see Note 15).