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Pension Benefit Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Percentage of Plan Assets: |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income | Other Nonoperating Income | Other Nonoperating Income | Other Nonoperating Income
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income | Other Nonoperating Income | Other Nonoperating Income | Other Nonoperating Income
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income | Other Nonoperating Income | Other Nonoperating Income | Other Nonoperating Income
United States |  |  |  |
Percentage of Plan Assets: |  |  |  |
Interest cost on projected benefit obligation | $ 2.5 | $ 2.4 | $ 4.9 | $ 4.9
Expected return on plan assets | (1.4) | (1.4) | (2.8) | (2.9)
Amortization of net loss (gain) | 0.7 | 0.8 | 1.5 | 1.7
Net periodic benefit cost (credit) | 1.8 | 1.8 | 3.6 | 3.7
Change in benefit obligation: |  |  |  |
Employer contributions |  |  | 4.4 |
Expected remaining scheduled annual employer contributions for the current fiscal year | 8.5 |  | 8.5 |
International |  |  |  |
Percentage of Plan Assets: |  |  |  |
Service costs |  | 0.1 | 0.1 | 0.2
Interest cost on projected benefit obligation | 10.9 | 11.9 | 21.6 | 23.4
Expected return on plan assets | (14.2) | (15.1) | (28.3) | (29.8)
Amortization of net loss (gain) | (0.6) | (0.2) | (1.2) | (0.3)
Net periodic benefit cost (credit) | (3.9) | $ (3.3) | (7.8) | $ (6.5)
Change in benefit obligation: |  |  |  |
Employer contributions |  |  | 13.1 |
Expected remaining scheduled annual employer contributions for the current fiscal year | $ 12.6 |  | $ 12.6 |

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