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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Apr. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Indefinite-lived Intangible Assets [Line Items] |  |  |
Customer relationships, noncompete agreements and other (subject to amortization) |  | $ 7.9 |
Trademarks and tradenames (not subject to amortization) | $ 50.3 |  | $ 134.1
Gross carrying amount | 906.8 |  | 951.9
Accumulated amortization | (393.2) |  | (340.2)
Intangible assets, net | 513.6 |  | 611.7
Customer relationships, noncompete agreements, and other |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Customer relationships, noncompete agreements and other (subject to amortization) | 848.6 |  | 817.8
Trademarks and Trade Names |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Customer relationships, noncompete agreements and other (subject to amortization) | $ 7.9 |  | $ 0.0

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite 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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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite 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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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having 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=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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