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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived computer software, gross amount $ 28.6 $ 33.9
Finite-lived intangible assets, gross amount 70.9 27.4
Finite-lived intangible assets, accumulated amortization (21.4) (15.5)
Finite-lived intangible assets, net amount 49.5 11.9
Indefinite-lived intangible assets, gross amount 5.3 4.8
Intangible assets, gross amount 76.2 32.2
Total intangible assets, net amount 54.8 16.7
Website Domains [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived license agreements 2.1 2.1
Business Licenses [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets, gross amount 3.2 2.7
Trade/Domain Names [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived trade names, gross amount 3.7 0.0
Finite-lived intangible assets, accumulated amortization (0.2) 0.0
Finite-lived intangible assets, net amount 3.5 0.0
Software Programs/Platforms [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived computer software, gross amount 29.0 5.3
Finite-lived intangible assets, accumulated amortization (4.9) (3.0)
Finite-lived intangible assets, net amount 24.1 2.3
Customer Base [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived customer lists, gross amount 38.2 22.1
Finite-lived intangible assets, accumulated amortization (16.3) (12.5)
Finite-lived intangible assets, net amount $ 21.9 $ 9.6