Employee Benefit Plans - Components of Net Pension (Income)/Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Retirement Benefits [Abstract]
Service cost – benefits earned during the period	$ 1.5	$ 1.3	$ 4.5	$ 3.9
Interest cost on projected benefits	21.8	21.2	65.5	63.4
Expected return on plan assets	(29.0)	(29.0)	(87.0)	(86.9)
Net amortization and deferral	0.7	0.7	2.2	2.2
Net pension income	$ (5.0)	$ (5.8)	$ (14.8)	$ (17.4)