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Commitments and Contingencies - Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |
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Jun. 30, 2014 lb | Jun. 30, 2014 Minimum lawsuit | Jun. 30, 2014 PNG MGP | Jun. 30, 2014 Environmental Matters CPG MGP | Jun. 30, 2014 Environmental Matters PNG MGP | Jun. 30, 2014 Environmental Matters UGI Utilities | Jun. 30, 2014 CPG and PNG COAs UGI Utilities | Jun. 30, 2013 CPG and PNG COAs UGI Utilities
Commitments and Contingencies |  |  |  |  |  |  |  |
Environmental expenditures cap during calendar year |  |  |  | $ 1.8 | $ 1.1 |  |  |
Loss Contingency, Settlement Agreement, Terms |  |  | P2Y |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  |  |  | $ 11.4 | $ 14.4
Base year for determination of investigation and remediation cost (in years) |  |  |  |  |  | 5 years |  |
Amount of propane in cylinders before reduction | 17 |  |  |  |  |  |  |
Amount of propane in cylinders after reduction | 15 |  |  |  |  |  |  |
Class action lawsuits (more than 20) |  | 20 |  |  |  |  |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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