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v3.25.1

Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | $ 35.4 | $ 46.7
Finite-lived intangible assets, accumulated amortization | (19.0) | (32.9)
Total intangible assets subject to amortization | 16.4 | 13.8
Indefinite-lived intangible assets | 5.8 | 5.8
Intangible assets, gross amount | 41.2 | 52.5
Total intangible assets, net amount | 22.2 | 19.6
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 | 3.7 | 3.7
Trade/domain names and other licenses |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived trade/domain names, gross amount | 7.7 | 4.1
Finite-lived intangible assets, accumulated amortization | (3.8) | (3.2)
Total intangible assets subject to amortization | 3.9 | 0.9
Software programs/platforms |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived software programs/platforms, gross amount | 2.4 | 4.9
Finite-lived intangible assets, accumulated amortization | (1.8) | (4.1)
Total intangible assets subject to amortization | 0.6 | 0.8
Client and supplier base |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived customer base, gross amount | 25.3 | 37.7
Finite-lived intangible assets, accumulated amortization | (13.4) | (25.6)
Total intangible assets subject to amortization | $ 11.9 | $ 12.1

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