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Pension and Other Postretirement Benefits - Schedule of Reconciliation of Benefit Obligations, Plan Assets and Funded Status of the Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year |  |  |
Fair value of plan assets at end of year |  |  |
Pension Benefits |  |  |
Change in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 848.2 | 959.4 |
Service cost | 8.2 | 8.1 | $ 8.6
Interest cost | 43.7 | 46.2 | 36.6
Benefits paid | (68.8) | (77.5) |
Actuarial gain | (2.3) | (65.3) |
Plan settlements | (147.2) | (23.3) |
Other | 0.9 | 0.6 |
Projected benefit obligation at end of year | 682.7 | 848.2 | 959.4
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 654.8 | 759.4 |
Actual return | 18.5 | (7.4) |
Benefits paid | (68.8) | (77.5) |
Contributions | 14.5 | 3.6 |
Plan settlements | (147.2) | (23.3) |
Fair value of plan assets at end of year | 471.8 | 654.8 | 759.4
Funded status of the plans | (210.9) | (193.4) |
Amounts recognized in the consolidated balance sheets: |  |  |
Accrued liabilities - current | (3.3) | (3.3) |
Accrued pension and postretirement benefits - noncurrent | (207.6) | (190.1) |
Amounts recognized in the consolidated balance sheets | (210.9) | (193.4) |
Other Benefits |  |  |
Change in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 182.3 | 206.2 |
Service cost | 1.5 | 1.8 | 2.4
Interest cost | 10.2 | 10.0 | 7.4
Benefits paid | (12.3) | (13.5) |
Actuarial gain | (8.9) | (22.2) |
Plan settlements | 0.0 | 0.0 |
Other | 0.0 | 0.0 |
Projected benefit obligation at end of year | 172.8 | 182.3 | 206.2
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 120.4 | 114.7 |
Actual return | 25.6 | 15.9 |
Benefits paid | (12.3) | (13.5) |
Contributions | 2.6 | 3.3 |
Plan settlements | 0.0 | 0.0 |
Fair value of plan assets at end of year | 136.3 | 120.4 | $ 114.7
Funded status of the plans | (36.5) | (61.9) |
Amounts recognized in the consolidated balance sheets: |  |  |
Accrued liabilities - current | (15.4) | (16.1) |
Accrued pension and postretirement benefits - noncurrent | (21.1) | (45.8) |
Amounts recognized in the consolidated balance sheets | $ (36.5) | $ (61.9) |

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