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Pension Benefit Obligations (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021
United States |  |  |
Components of net periodic benefit cost: |  |  |
Service costs |  |  |
Interest cost on projected benefit obligation | $ 1.0 | 1.6 |
Expected return on plan assets | (1.6) | (1.8) |
Amortization of net loss | 1.5 | 1.2 |
Net periodic benefit cost | 0.9 | 1.0 |
Change in benefit obligation: |  |  |
Employer contributions | 3.0 |  |
Expected remaining scheduled annual employer contributions for the current fiscal year |  |  | $ 9.2
International |  |  |
Components of net periodic benefit cost: |  |  |
Service costs | 0.1 | 0.2 |
Interest cost on projected benefit obligation | 5.3 | 5.6 |
Expected return on plan assets | (10.5) | (9.4) |
Amortization of net loss | 2.2 | 2.1 |
Net periodic benefit cost | (2.9) | $ (1.5) |
Change in benefit obligation: |  |  |
Employer contributions | $ 7.3 |  |
Expected remaining scheduled annual employer contributions for the current fiscal year |  |  | $ 21.7

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