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Commitments and Contingencies (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Jan. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) subsidiary lb | Oct. 31, 2014 lawsuit | Dec. 31, 2015 USD ($)
Loss Contingencies |  |  |  |  |
Amount awarded |  | $ 18.0 |  |  |
Adjustment to litigation accrual | $ 15.0 |  |  |  |
Class action lawsuits (more than) | lawsuit |  |  |  | 35 |
Amount of propane in cylinders before reduction (in pounds) | lb |  |  | 17 |  |
Amount of propane in cylinders after reduction (in pounds) | lb |  |  | 15 |  |
CPG MGP | Environmental Matters |  |  |  |  |
Loss Contingencies |  |  |  |  |
Environmental expenditures cap during calendar year |  |  | $ 1.8 |  |
PNG MGP | Environmental Matters |  |  |  |  |
Loss Contingencies |  |  |  |  |
Environmental expenditures cap during calendar year |  |  | 1.1 |  |
UGI Gas | Environmental Matters |  |  |  |  |
Loss Contingencies |  |  |  |  |
Environmental expenditures cap during calendar year |  |  | $ 2.5 |  |
PNG-COA |  |  |  |  |
Loss Contingencies |  |  |  |  |
Loss contingency, settlement agreement, terms |  |  | 2 years |  |
UGI Utilities | CPG, PNG and UGI Gas COAs |  |  |  |  |
Loss Contingencies |  |  |  |  |
Accrual for environmental loss contingencies | $ 55.1 |  | $ 55.3 |  | $ 11.7
UGI Utilities | PNG and CPG |  |  |  |  |
Loss Contingencies |  |  |  |  |
Number of subsidiaries acquired with similar histories | subsidiary |  |  | 2 |  |

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