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Intangible Assets - Schedule of Gross and Net Carrying Values of Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross amount $ 33.0 $ 46.7
Finite-lived intangible assets, accumulated amortization (17.5) (32.9)
Finite-lived intangible assets, net amount 15.5 13.8
Indefinite-lived intangible assets 5.7 5.8
Intangible assets, gross amount 38.7 52.5
Total intangible assets, net amount 21.2 19.6
Website domains    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 2.0 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 and other licenses, gross amount 6.7 4.1
Finite-lived intangible assets, accumulated amortization (3.4) (3.2)
Finite-lived intangible assets, net amount 3.3 0.9
Software programs/platforms    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived software programs/platforms, gross amount 2.3 4.9
Finite-lived intangible assets, accumulated amortization (1.5) (4.1)
Finite-lived intangible assets, net amount 0.8 0.8
Client and supplier base    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived customer base, gross amount 24.0 37.7
Finite-lived intangible assets, accumulated amortization (12.6) (25.6)
Finite-lived intangible assets, net amount $ 11.4 $ 12.1