Other (Income)/Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Other Income and Expenses [Abstract]
Interest income on corporate funds	$ (55.9)	$ (24.1)	$ (159.3)	$ (82.8)
Realized losses on available-for-sale securities, net	1.2	0.9	5.2	13.9
Gain on sale of assets	(1.2)	0.0	(17.1)	0.0
Impairment of assets	0.0	0.0	0.0	0.3
Non-service components of pension income, net (see Note 11)	(8.4)	(13.1)	(25.6)	(37.7)
Other (income)/expense, net	$ (64.3)	$ (36.3)	$ (196.8)	$ (106.3)