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Intangible Assets - Schedule of Gross and Net Intangible Assets by Major Class (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Intangible Asset, Acquired, Finite-Lived [Line Items]    
Finite-lived intangible assets, gross amount $ 35.4 $ 46.7
Finite-lived intangible assets, accumulated amortization (20.3) (32.9)
Total intangible assets subject to amortization 15.1 13.8
Indefinite-lived intangible assets 6.0 5.8
Intangible assets, gross amount 41.4 52.5
Total intangible assets, net amount 21.1 19.6
Website domains    
Intangible Asset, Acquired, Finite-Lived [Line Items]    
Indefinite-lived license agreements 2.3 2.1
Business licenses    
Intangible Asset, Acquired, Finite-Lived [Line Items]    
Indefinite-lived intangible assets 3.7 3.7
Trade/domain names and other licenses    
Intangible Asset, Acquired, Finite-Lived [Line Items]    
Finite-lived trade/domain names and other licenses, gross amount 7.7 4.1
Finite-lived intangible assets, accumulated amortization (4.2) (3.2)
Total intangible assets subject to amortization 3.5 0.9
Software programs/platforms    
Intangible Asset, Acquired, Finite-Lived [Line Items]    
Finite-lived software programs/platforms, gross amount 2.4 4.9
Finite-lived intangible assets, accumulated amortization (1.9) (4.1)
Total intangible assets subject to amortization 0.5 0.8
Client and supplier base    
Intangible Asset, Acquired, Finite-Lived [Line Items]    
Finite-lived customer base, gross amount 25.3 37.7
Finite-lived intangible assets, accumulated amortization (14.2) (25.6)
Total intangible assets subject to amortization $ 11.1 $ 12.1