Segment and Geographic Information - Schedule of Operating Revenues, Property and Equipment by Geographic Areas (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, Net	$ 800.1	$ 743.3
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, Net	640.8	588.5
Europe, Middle East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, Net	124.0	115.4
Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, Net	29.7	32.8
Americas excluding United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, Net	$ 5.6	$ 6.6