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Employee Benefit Plans - Investments of the Plan Measured at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 1,938.2 | $ 1,879.6 | $ 1,854.4
Commingled trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 501.6 | 679.5 |
Commingled trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Commingled trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 501.6 | 679.5 |
Commingled trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 532.4 | 490.4 |
Government securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Government securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 532.4 | 490.4 |
Government securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Corporate and municipal bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 783.6 | 695.4 |
Corporate and municipal bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Corporate and municipal bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 783.6 | 695.4 |
Corporate and municipal bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Mortgage-backed security bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 15.7 | 3.9 |
Mortgage-backed security bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Mortgage-backed security bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 15.7 | 3.9 |
Mortgage-backed security bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Total pension asset investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1,833.3 | 1,869.2 |
Total pension asset investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.0 | 0.0 |
Total pension asset investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1,833.3 | 1,869.2 |
Total pension asset investments | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 0.0 | $ 0.0 |

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