Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025
Property, Plant, and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,684.4	$ 2,577.4
Less: accumulated depreciation	(2,043.1)	(1,922.0)
Property, plant and equipment, net	641.3	655.4
Land and buildings
Property, Plant, and Equipment [Line Items]
Property, plant and equipment, gross	648.4	637.2
Data processing equipment
Property, Plant, and Equipment [Line Items]
Property, plant and equipment, gross	1,330.7	1,264.5
Furniture, leaseholds and other
Property, Plant, and Equipment [Line Items]
Property, plant and equipment, gross	$ 705.3	$ 675.7