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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other non-operating income (expense), net | Other non-operating income (expense), net |
Defined Benefit Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company contributions |  |  | $ 20.8 | $ 25.6 | $ 34.7
Defined Benefit Pension Plan | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total expected contributions for current fiscal year | $ 30.0 |  | 30.0 |  |
Defined Benefit Pension Plan | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total expected contributions for current fiscal year | 40.0 |  | 40.0 |  |
Other Postretirement Benefits Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Amortization of actuarial gain | $ 0.0 | $ 0.1 | $ 0.4 | $ 0.4 |

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