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Pension Benefit Obligations | 6 Months Ended
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Mar. 31, 2024
Pension Benefit Obligations |
Pension Benefit Obligations | 6. Pension Benefit Obligations ​ In the U.S., the Company sponsors various qualified defined benefit pension plans. Benefits under these plans generally are based on the employee’s years of creditable service and compensation; however, all U.S. defined benefit plans are closed to new participants and have frozen accruals. ​ The Company also sponsors various non-qualified plans in the U.S.; all of these plans are frozen. Outside the U.S., the Company sponsors various pension plans, which are appropriate to the country in which the Company operates, some of which are government mandated. ​ The components of net periodic benefit cost other than the service cost component are included in other income in the consolidated statement of operations. The following table details the components of net periodic benefit cost for the Company’s pension plans for the three and six months ended March 31, 2024 and 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | March 31, 2024 | ​ | March 31, 2023 | ​ | March 31, 2024 | ​ | March 31, 2023
​ |  | U.S. |  | Int’l |  | U.S. |  | Int’l |  | U.S. |  | Int’l |  | U.S. |  | Int’l
​ | ​ | (in millions)
Components of net periodic benefit cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service costs | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 0.1 | ​ | $ | — | ​ | $ | 0.1 | ​ | $ | — | ​ | $ | 0.2
Interest cost on projected benefit obligation | ​ |  | 2.5 | ​ | ​ | 10.9 | ​ | ​ | 2.4 | ​ | ​ | 11.9 | ​ | ​ | 4.9 | ​ | ​ | 21.6 | ​ | ​ | 4.9 | ​ | ​ | 23.4
Expected return on plan assets | ​ |  | (1.4) | ​ | ​ | (14.2) | ​ | ​ | (1.4) | ​ | ​ | (15.1) | ​ | ​ | (2.8) | ​ | ​ | (28.3) | ​ | ​ | (2.9) | ​ | ​ | (29.8)
Amortization of net loss (gain) | ​ |  | 0.7 | ​ | ​ | (0.6) | ​ | ​ | 0.8 | ​ | ​ | (0.2) | ​ | ​ | 1.5 | ​ | ​ | (1.2) | ​ | ​ | 1.7 | ​ | ​ | (0.3)
Net periodic benefit cost (credit) | ​ | $ | 1.8 | ​ | $ | (3.9) | ​ | $ | 1.8 | ​ | $ | (3.3) | ​ | $ | 3.6 | ​ | $ | (7.8) | ​ | $ | 3.7 | ​ | $ | (6.5)
​ The total amounts of employer contributions paid for the six months ended March 31, 2024 were $4.4 million for U.S. plans and $13.1 million for non-U.S. plans. The expected remaining scheduled annual employer contributions for the fiscal year ending September 30, 2024 are $8.5 million for U.S. plans and $12.6 million for non-U.S. plans.

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