Pension and Other Postretirement Benefits - Schedule of Projected Benefit Obligations in Excess of Plan Assets and Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Millions	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 843.8	$ 956.4
Fair value of plan assets	654.8	759.4
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	182.3	206.1
Fair value of plan assets	$ 120.4	$ 114.7