Goodwill and Intangible Assets, net - Schedule of Components of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 5,849.9	$ 5,782.8
Intangible assets, accumulated amortization	(4,251.9)	(4,179.8)
Intangible assets, net	1,598.0	1,603.0
Software and software licenses
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	4,161.4	4,103.6
Intangible assets, accumulated amortization	(2,883.1)	(2,830.3)
Customer contracts and lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	1,438.5	1,429.4
Intangible assets, accumulated amortization	(1,124.3)	(1,105.6)
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	250.0	249.8
Intangible assets, accumulated amortization	$ (244.5)	$ (243.9)