Goodwill and Intangible Assets, net - Components Of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021
Finite-Lived Intangible Assets [Line Items]
Total - gross	$ 4,323.7	$ 4,252.0
Total - accumulated amortization	(3,112.1)	(3,041.9)
Intangible assets, net	1,211.6	1,210.1
Software and software licenses
Finite-Lived Intangible Assets [Line Items]
Total - gross	3,001.4	2,950.8
Total - accumulated amortization	(2,138.3)	(2,090.4)
Customer contracts and lists
Finite-Lived Intangible Assets [Line Items]
Total - gross	1,081.3	1,062.2
Total - accumulated amortization	(744.1)	(723.4)
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Total - gross	241.0	239.0
Total - accumulated amortization	$ (229.7)	$ (228.1)