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Goodwill and Intangible Assets - Components of Company's Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
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Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Goodwill (not subject to amortization) | $ 3,154.8 | $ 3,160.4 | $ 3,185.5
Intangible assets: |  |  |
Customer relationships, noncompete agreements and other | 853.0 | 848.6 | 862.0
Trademarks and tradenames | 7.9 | 7.9 | 0.0
Accumulated amortization | (405.4) | (393.2) | (355.0)
Intangible assets, net (definite-lived) | 455.5 | 463.3 | 507.0
Trademarks and tradenames (indefinite-lived) | 49.7 | 50.3 | 134.9
Total intangible assets, net | $ 505.2 | $ 513.6 | $ 641.9

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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=66006027&loc=d3e16323-109275 + Details
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