Employee Benefit Plans - Schedule of Components of Net Pension (Income)/Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Retirement Benefits [Abstract]
Service cost – benefits earned during the period	$ 2.0	$ 1.5	$ 4.0	$ 3.0
Interest cost on projected benefits	21.7	21.9	43.4	43.7
Expected return on plan assets	(28.3)	(29.0)	(56.6)	(58.0)
Net amortization and deferral	0.7	0.7	1.5	1.5
Net pension (income)/expense	$ (3.9)	$ (4.9)	$ (7.7)	$ (9.8)