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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Sep. 30, 2020
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | $ 70.9 | $ 70.9
Finite-lived intangible assets, accumulated amortization | (28.8) | (21.4)
Total intangible assets subject to amortization | 42.1 | 49.5
Indefinite-lived intangible assets | 5.9 | 5.3
Intangible assets, gross amount | 76.8 | 76.2
Total intangible assets, net amount | 48.0 | 54.8
Website domains |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived license agreements | 2.1 | 2.1
Business licenses |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 3.8 | 3.2
Trade/domain names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived trade/domain names, gross amount | 3.7 | 3.7
Finite-lived intangible assets, accumulated amortization | (0.5) | (0.2)
Total intangible assets subject to amortization | 3.2 | 3.5
Software programs/platforms |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived software programs/platforms, gross amount | 29.0 | 29.0
Finite-lived intangible assets, accumulated amortization | (9.1) | (4.9)
Total intangible assets subject to amortization | 19.9 | 24.1
Customer base |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived customer base, gross amount | 38.2 | 38.2
Finite-lived intangible assets, accumulated amortization | (19.2) | (16.3)
Total intangible assets subject to amortization | $ 19.0 | $ 21.9

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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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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a reasonably expected period of economic benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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