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Property and Equipment, net - Accumulated Depreciation (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Property, Plant and Equipment, Net [Abstract]    
Furniture and fixtures $ 10.2 $ 10.6
Software 28.6 33.9
Equipment 30.8 28.1
Leasehold improvements 38.3 20.3
Total property and equipment 107.9 92.9
Less accumulated depreciation (45.8) (49.0)
Property and equipment, net $ 62.1 $ 43.9