Goodwill and Intangible Assets, net - Components Of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Total - gross	$ 4,998.7	$ 4,931.4
Total - accumulated amortization	(3,666.9)	(3,587.8)
Intangible assets, net	1,331.8	1,343.6
Software and software licenses
Finite-Lived Intangible Assets [Line Items]
Total - gross	3,608.6	3,548.9
Total - accumulated amortization	(2,496.2)	(2,442.6)
Customer contracts and lists
Finite-Lived Intangible Assets [Line Items]
Total - gross	1,148.2	1,140.6
Total - accumulated amortization	(931.9)	(907.5)
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Total - gross	241.9	241.9
Total - accumulated amortization	$ (238.8)	$ (237.7)