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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived computer software, gross amount | $ 28.6 | $ 33.9
Finite-lived intangible assets, gross amount | 70.9 | 27.4
Finite-lived intangible assets, accumulated amortization | (21.4) | (15.5)
Finite-lived intangible assets, net amount | 49.5 | 11.9
Indefinite-lived intangible assets, gross amount | 5.3 | 4.8
Intangible assets, gross amount | 76.2 | 32.2
Total intangible assets, net amount | 54.8 | 16.7
Website Domains [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived license agreements | 2.1 | 2.1
Business Licenses [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets, gross amount | 3.2 | 2.7
Trade/Domain Names [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived trade names, gross amount | 3.7 | 0.0
Finite-lived intangible assets, accumulated amortization | (0.2) | 0.0
Finite-lived intangible assets, net amount | 3.5 | 0.0
Software Programs/Platforms [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived computer software, gross amount | 29.0 | 5.3
Finite-lived intangible assets, accumulated amortization | (4.9) | (3.0)
Finite-lived intangible assets, net amount | 24.1 | 2.3
Customer Base [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived customer lists, gross amount | 38.2 | 22.1
Finite-lived intangible assets, accumulated amortization | (16.3) | (12.5)
Finite-lived intangible assets, net amount | $ 21.9 | $ 9.6

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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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