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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross amount $ 43.7 $ 70.9
Finite-lived intangible assets, accumulated amortization (31.3) (53.4)
Total intangible assets subject to amortization 12.4 17.5
Indefinite-lived intangible assets 5.8 5.6
Intangible assets, gross amount 49.5 76.5
Total intangible assets, net amount 18.2 23.1
Website domains    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived license agreements 2.1 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 (3.0) (2.4)
Total intangible assets subject to amortization 1.1 1.7
Software programs/platforms    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived software programs/platforms, gross amount 4.8 28.5
Finite-lived intangible assets, accumulated amortization (3.8) (26.9)
Total intangible assets subject to amortization 1.0 1.6
Client and supplier base    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived customer base, gross amount 34.8 38.3
Finite-lived intangible assets, accumulated amortization (24.5) (24.1)
Total intangible assets subject to amortization $ 10.3 $ 14.2