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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | $ 43.1 | $ 70.9
Finite-lived intangible assets, accumulated amortization | (27.6) | (53.4)
Total intangible assets subject to amortization | 15.5 | 17.5
Indefinite-lived intangible assets | 5.7 | 5.6
Intangible assets, gross amount | 48.8 | 76.5
Total intangible assets, net amount | 21.2 | 23.1
Website domains |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived license agreements | 2.0 | 1.9
Business licenses |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 3.7 | 3.7
Trade/domain names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived trade/domain names, gross amount | 4.1 | 4.1
Finite-lived intangible assets, accumulated amortization | (2.6) | (2.4)
Total intangible assets subject to amortization | 1.5 | 1.7
Software programs/platforms |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived software programs/platforms, gross amount | 4.9 | 28.5
Finite-lived intangible assets, accumulated amortization | (3.5) | (26.9)
Total intangible assets subject to amortization | 1.4 | 1.6
Client and supplier base |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived customer base, gross amount | 34.1 | 38.3
Finite-lived intangible assets, accumulated amortization | (21.5) | (24.1)
Total intangible assets subject to amortization | $ 12.6 | $ 14.2

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