Employee Benefit Plans - Components Of Net Pension (Income)/Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Retirement Benefits [Abstract]
Service cost – benefits earned during the year	$ 6.0	$ 5.2	$ 4.8
Interest cost on projected benefits	87.4	84.6	78.2
Expected return on plan assets	(116.0)	(115.9)	(127.5)
Net amortization and deferral	3.2	2.9	1.9
Special termination benefits, plan curtailments, and settlement charges	(0.3)	0.3	0.0
Net pension (income)/expense	$ (19.7)	$ (22.9)	$ (42.6)