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Common Stock and Equity-Based Compensation - Schedule of Payment for UGI Performance Unit and UGI Stock Unit Awards in Shares and Cash (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
UGI Performance Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of original awards granted (in shares) | 136,621 | 178,450 | 308,362
Performance period beginning January 1: | 2015 | 2014 | 2013
Payment of awards: |  |  |
Shares of UGI Common Stock issued, net of shares withheld for taxes | 69,680 | 138,985 | 209,592
Cash paid | $ 1.6 | $ 10.9 | $ 13.9
UGI Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of original awards granted (in shares) | 39,680 | 43,699 | 51,037
Payment of awards: |  |  |
Shares of UGI Common Stock issued, net of shares withheld for taxes | 29,095 | 15,990 | 39,422
Cash paid | $ 0.6 | $ 0.3 | $ 0.7

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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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