Other (Income)/Expense, Net - Summary of Other Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Other Income, Net [Abstract]
Interest income on corporate funds	$ (319.5)	$ (241.3)	$ (149.5)
Realized losses on available-for-sale securities, net	1.7	5.9	14.7
Impairment of assets	0.0	0.0	2.1
Gain on sale of assets	(5.0)	(17.1)	0.0
Non-service components of pension income, net	(31.3)	(34.2)	(50.8)
Other income, net	$ (354.1)	$ (286.7)	$ (183.5)