Employee Benefit Plans - Defined Benefit Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Rabbi trust assets	$ 57.8	$ 55.6
Benefit expense	3.8	6.2	$ 6.1
Benefit obligation	58.6	57.0	65.9
SORP | Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit expense	3.4	5.7	5.6
Benefit obligation	53.4	51.6	59.5
SERP | Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit expense	0.4	0.5	0.5
Benefit obligation	$ 5.2	$ 5.4	$ 6.4