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Pension Benefit Obligations (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022
Percentage of Plan Assets: |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Nonoperating Income (Expense) |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Nonoperating Income (Expense) |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Nonoperating Income (Expense) |  |
United States |  |  |
Percentage of Plan Assets: |  |  |
Interest cost on projected benefit obligation | $ 2.5 | $ 1.2 |
Expected return on plan assets | (1.5) | (1.4) |
Amortization of net loss/(gain) | 0.9 | 1.4 |
Net periodic benefit cost (credit) | 1.9 | 1.2 |
Change in benefit obligation: |  |  |
Employer contributions | 2.5 |  |
Expected remaining scheduled annual employer contributions for the current fiscal year |  |  | $ 6.2
International. |  |  |
Percentage of Plan Assets: |  |  |
Service costs | 0.1 | 0.1 |
Interest cost on projected benefit obligation | 11.5 | 6.4 |
Expected return on plan assets | (14.7) | (11.0) |
Amortization of net loss/(gain) | (0.1) | 1.9 |
Net periodic benefit cost (credit) | (3.2) | $ (2.6) |
Change in benefit obligation: |  |  |
Employer contributions | $ 4.8 |  |
Expected remaining scheduled annual employer contributions for the current fiscal year |  |  | $ 18.0

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