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, 2022	Jun. 30, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 956.4	$ 1,217.6
Fair value of plan assets	759.4	999.4
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	206.1	249.3
Fair value of plan assets	$ 114.7	$ 136.3