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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Components of Company's Goodwill and Intangible Assets | Goodwill and intangible assets comprise the following:
|  | March 31, 2017 |  | September 30, 2016 |  | March 31, 2016
Goodwill (not subject to amortization) |  | $ | 2,948.4 |  |  | $ | 2,989.0 |  |  | $ | 2,998.6 |
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 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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