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Pension Benefit Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
United States |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Interest cost on projected benefit obligation | $ 1.6 | $ 2.1 | $ 3.2 | $ 4.3
Expected return on plan assets | (1.7) | (2.2) | (3.5) | (4.5)
Amortization of prior service cost | 0.1 | 0.1 | 0.1 | 0.1
Amortization of net loss | 1.2 | 0.9 | 2.4 | 1.9
Settlement loss recognized | 0.5 | 0.1 | 0.5 | 0.1
Net periodic benefit cost | 1.7 | 1.0 | 2.7 | 1.9
Change in benefit obligation: |  |  |  |
Employer contributions |  |  | 4.5 |
Expected remaining scheduled annual employer contributions for the current fiscal year | 4.2 |  | 4.2 |
Foreign Pension Plan, Defined Benefit |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Service costs | 0.1 | 0.1 | 0.3 | 0.2
Interest cost on projected benefit obligation | 5.7 | 7.7 | 11.3 | 15.1
Expected return on plan assets | (9.4) | (9.8) | (18.8) | (19.3)
Amortization of prior service cost |  | (0.1) |  | (0.1)
Amortization of net loss | 2.2 | 1.1 | 4.3 | 2.1
Settlement loss recognized | 0.2 |  | 0.2 | 0.1
Net periodic benefit cost | (1.2) | $ (1.0) | (2.7) | $ (1.9)
Change in benefit obligation: |  |  |  |
Employer contributions |  |  | 14.0 |
Expected remaining scheduled annual employer contributions for the current fiscal year | $ 13.7 |  | $ 13.7 |

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