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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Components of Company's Goodwill and Intangible Assets | Goodwill and intangible assets comprise the following:
|  | March 31, 2019 |  | September 30, 2018 |  | March 31, 2018
Goodwill (not subject to amortization) |  | $ | 3,147.8 |  |  | $ | 3,160.4 |  |  | $ | 3,218.1 |
Intangible assets: |  |  |  |  |  |
Customer relationships, noncompete agreements and other |  | $ | 837.3 |  |  | $ | 848.6 |  |  | $ | 867.0 |
Trademarks and tradenames |  | 16.5 |  |  | 7.9 |  |  | — |
Accumulated amortization |  | (416.3 | ) |  | (393.2 | ) |  | (376.2 | )
Intangible assets, net (definite-lived) |  | 437.5 |  |  | 463.3 |  |  | 490.8 |
Trademarks and tradenames (indefinite-lived) |  | 50.8 |  |  | 50.3 |  |  | 136.3 |
Total intangible assets, net |  | $ | 488.3 |  |  | $ | 513.6 |  |  | $ | 627.1 |

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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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