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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, 2024 | Jun. 30, 2023
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Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 678.5 | $ 843.8
Fair value of plan assets | 471.8 | 654.8
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | 172.8 | 182.3
Fair value of plan assets | $ 136.3 | $ 120.4

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