Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,503.3	$ 2,439.0
Less: accumulated depreciation	(1,817.7)	(1,757.6)
Property, plant and equipment, net	685.6	681.4
Land and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	648.1	682.2
Data processing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,185.2	1,087.5
Furniture, leaseholds and other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 670.0	$ 669.3