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Pension and Other Postretirement Benefits - Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Pension Benefits |  |
Amounts recognized in accumulated other comprehensive loss: |  |
Net actuarial loss (gain) | $ 215.4 | $ 260.3
Prior service cost (benefit) | 4.2 | 5.8
Total | 219.6 | 266.1
Other changes in plan assets and benefit obligations recognized in other comprehensive income consist of: |  |
Net actuarial loss (gain) | 15.5 | (12.5)
Amortization of net (loss) gain | (8.0) | (9.5)
Amortization of prior service (cost) benefit | (2.1) | (2.1)
Settlement charge | (51.9) | 0.0
Total, before tax effect | (46.5) | (24.1)
Additional information: |  |
Accumulated benefit obligation for all pension plans | 678.5 | 843.8
Other Benefits |  |
Amounts recognized in accumulated other comprehensive loss: |  |
Net actuarial loss (gain) | (64.3) | (39.7)
Prior service cost (benefit) | 1.5 | (2.4)
Total | (62.8) | (42.1)
Other changes in plan assets and benefit obligations recognized in other comprehensive income consist of: |  |
Net actuarial loss (gain) | (27.2) | (31.2)
Amortization of net (loss) gain | 2.5 | 1.8
Amortization of prior service (cost) benefit | 3.9 | 3.9
Settlement charge | 0.0 | 0.0
Total, before tax effect | $ (20.8) | $ (25.5)

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