Goodwill and Intangible Assets, net - Components of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Jun. 30, 2024
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 5,687.0	$ 5,227.3
Intangible assets, accumulated amortization	(4,082.7)	(3,891.3)
Intangible assets, net	1,604.3	1,336.0
Software and software licenses
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	4,042.7	3,803.7
Intangible assets, accumulated amortization	(2,762.8)	(2,642.6)
Customer contracts and lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	1,394.8	1,181.6
Intangible assets, accumulated amortization	(1,076.7)	(1,007.6)
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	249.5	242.0
Intangible assets, accumulated amortization	$ (243.2)	$ (241.1)