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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 19, 2017 | Oct. 14, 2016 | Apr. 01, 2016 | Apr. 01, 2015 | Mar. 31, 2016 | Dec. 31, 2016 | Sep. 30, 2014 | Sep. 30, 2016 | Dec. 31, 2015
Pennsylvania Public Utility Commission | Subsequent Event |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Review process period | 9 months |  |  |  |  |  |  |  |
UGI Utilities | Pennsylvania Public Utility Commission |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Operating revenue increase |  | $ 27.0 |  |  |  |  |  |  |
Maximum period since petition to file a general rate filing |  |  |  |  |  | 5 years |  |  |
DSIC, percent of amount billed to customers |  |  |  |  |  |  | 0.00% |  |
UGI Utilities | Pennsylvania Public Utility Commission | PNG |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  | 0.00% |  |  |  |  |
UGI Utilities | Pennsylvania Public Utility Commission | CPG |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  | 0.00% |  |  |  |  |  |
UGI Utilities | Pennsylvania Public Utility Commission | Maximum |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  |  | 5.00% | 5.00% |  |  |
UGI Utilities | Pennsylvania Public Utility Commission | Maximum | PNG |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  |  | 10.00% |  |  |  |
UGI Utilities | Pennsylvania Public Utility Commission | Maximum | CPG |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
DSIC, percent of amount billed to customers |  |  |  |  | 10.00% |  |  |  |
UGI Utilities | Pennsylvania Public Utility Commission | Subsequent Event |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Requested operating revenue increase | $ 21.7 |  |  |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  |  |  |  |  | $ 6.9 |  | $ 4.3 | $ (4.5)

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