Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,577.4	$ 2,503.3
Less: accumulated depreciation	(1,922.0)	(1,817.7)
Property, plant and equipment, net	655.4	685.6
Land and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	637.2	648.1
Data processing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,264.5	1,185.2
Furniture, leaseholds and other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 675.7	$ 670.0