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Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	$ 1,893.9	$ 1,908.1
Less: accumulated depreciation and amortization	(944.8)	(961.7)
Property and Equipment, Net	$ 949.1	946.4
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	35 years
Buildings and leasehold improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	$ 1,096.4	1,064.3
Buildings and leasehold improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Buildings and leasehold improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	35 years
Software [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	$ 419.9	426.6
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Equipment and Furniture [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	$ 297.6	337.9
Equipment and Furniture [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Equipment and Furniture [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	$ 80.0	$ 79.3

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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