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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Components of Company's Goodwill and Intangible Assets | Goodwill and intangible assets comprise the following:
|  | June 30, 2018 |  | September 30, 2017 |  | June 30, 2017
Goodwill (not subject to amortization) |  | $ | 3,169.0 |  |  | $ | 3,107.2 |  |  | $ | 3,032.3 |
Intangible assets: |  |  |  |  |  |
Customer relationships, noncompete agreements and other |  | $ | 852.5 |  |  | $ | 817.8 |  |  | $ | 801.6 |
Trademarks and tradenames |  | 7.9 |  |  | — |  |  | — |
Accumulated amortization |  | (381.2 | ) |  | (340.2 | ) |  | (362.8 | )
Intangible assets, net (definite-lived) |  | 479.2 |  |  | 477.6 |  |  | 438.8 |
Trademarks and tradenames (indefinite-lived) |  | 50.6 |  |  | 134.1 |  |  | 132.4 |
Total intangible assets, net |  | $ | 529.8 |  |  | $ | 611.7 |  |  | $ | 571.2 |

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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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