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Goodwill and Intangible Assets - Components of Company's Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016
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Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |
Goodwill (not subject to amortization) | $ 2,948.4 | $ 2,989.0 | $ 2,998.6 | [1]
Intangible assets: |  |  |  |
Customer relationships, noncompete agreements and other | 764.3 | 773.5 | 778.3 |
Accumulated amortization | (342.4) | (324.8) | (312.3) |
Intangible assets, net (definite-lived) | 421.9 | 448.7 | 466.0 |
Trademarks and tradenames (indefinite-lived) | 129.1 | 131.6 | 132.2 |
Total intangible assets, net | $ 551.0 | $ 580.3 | $ 598.2 |
[1] | Restated to reflect (1) the current-year changes in the presentation of our UGI International and Midstream & Marketing reportable segments and (2) the adoption of new accounting guidance related to debt issuance costs (see Note 2).

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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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