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Benefit Plans and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2021
Benefit Plans and Other Postretirement Benefits |
Benefit Plans and Other Postretirement Benefits | Note 10—Benefit Plans and Other Postretirement Benefits ​ The Company and certain of its domestic subsidiaries have defined benefit pension plans (the “U.S. Plans”), which cover certain U.S. employees and which represent the majority of the plan assets and benefit obligations of the aggregate defined benefit plans of the Company. The U.S. Plans’ benefits are generally based on years of service and compensation and are generally noncontributory. The majority of U.S. employees are not covered by the U.S. Plans and are covered by defined contribution plans. Certain foreign subsidiaries have defined benefit plans covering their employees (the “Foreign Plans” and, together with the U.S. Plans, the “Plans”). ​ The following is a summary, based on the most recent actuarial valuations of the Company’s net cost for pension benefits, of the Plans for the three and six months ended June 30, 2021 and 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits
Three Months Ended June 30: |  | 2021 |  | 2020
Service cost |  | $ | 1.9 |  | $ | 1.8
Interest cost | ​ |  | 2.8 | ​ |  | 4.1
Expected return on plan assets | ​ |  | (7.8) | ​ |  | (9.3)
Amortization of prior service cost | ​ |  | 0.5 | ​ |  | 0.6
Amortization of net actuarial losses | ​ |  | 6.2 | ​ |  | 6.3
Net pension expense |  | $ | 3.6 |  | $ | 3.5
​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30: | ​ | ​ | ​ | ​ | ​ | ​
Service cost |  | $ | 3.8 |  | $ | 3.8
Interest cost | ​ |  | 5.6 | ​ |  | 8.3
Expected return on plan assets | ​ |  | (15.6) | ​ |  | (18.6)
Amortization of prior service cost | ​ |  | 1.0 | ​ |  | 1.1
Amortization of net actuarial losses | ​ |  | 12.4 | ​ |  | 12.5
Net pension expense |  | $ | 7.2 |  | $ | 7.1
​ Based on the Company’s current investment strategy for its U.S. Plans, the Company’s expected long-term rate of return assumption to determine net periodic pension expense for 2021 is 6.0%. There is no current requirement for cash contributions to any of the U.S. Plans, and the Company plans to evaluate annually, based on actuarial calculations and the investment performance of the Plans’ assets, the timing and amount of cash contributions in the future. ​ The Company offers various defined contribution plans for certain U.S. and foreign employees. Participation in these plans is based on certain eligibility requirements. The Company matches employee contributions to the U.S. defined contribution plans up to a maximum of 6% of eligible compensation. During the six months ended June 30, 2021 and 2020, the Company provided matching contributions to the U.S. defined contribution plans of approximately $8.4 and $6.7, respectively.

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