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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement charge | $ 51.9 | $ 0.0 | $ 0.0
Plan's current allocation policy | 95.00% |  |
Percentage increase in funding level to shift assets from return seeking to liability hedging | 5.00% |  |
Return Seeking Asset |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan's current allocation policy | 75.00% |  |
Liability Matching Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan's current allocation policy | 25.00% |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Change in discount rate | $ 5.4 |  |
Change in plan experience | 3.1 | 9.2 |
Mortality update | 4.9 | 13.8 |
Settlement charge | 51.9 | 0.0 | 0.0
Employer contributions | 14.5 | 3.6 |
Pension Benefits | Qualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 11.3 | 0.0 | 0.7
Expected contributions for next fiscal year | 26.3 |  |
Pension Benefits | Nonqualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 3.2 | 3.6 | 3.1
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Mortality update | 2.1 | 70.9 |
Settlement charge | 0.0 | 0.0 | 0.0
Employer contributions | $ 2.6 | 3.3 |
Other Benefits | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan's current allocation policy | 95.00% |  |
Other Benefits | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan's current allocation policy | 5.00% |  |
Defined Contribution Retirement and Savings Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to defined contribution retirement and savings plans | $ 26.5 | $ 23.3 | $ 21.0

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