Employee Benefit Plans - Schedule of Components of Net Pension (Income)/Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Retirement Benefits [Abstract]
Service cost – benefits earned during the period	$ 2.0	$ 1.5
Interest cost on projected benefits	21.7	21.9
Expected return on plan assets	(28.3)	(29.0)
Net amortization and deferral	0.8	0.7
Net pension (income)/expense	$ (3.8)	$ (4.9)