Goodwill and Intangible Assets, net - Components of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 5,309.4	$ 5,227.3
Intangible assets, accumulated amortization	(3,979.1)	(3,891.3)
Intangible assets, net	1,330.3	1,336.0
Software and software licenses
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	3,874.3	3,803.7
Intangible assets, accumulated amortization	(2,707.0)	(2,642.6)
Customer contracts and lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	1,192.9	1,181.6
Intangible assets, accumulated amortization	(1,030.5)	(1,007.6)
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	242.2	242.0
Intangible assets, accumulated amortization	$ (241.6)	$ (241.1)