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Pension and Other Postretirement Employee Benefit Plans | 3 Months Ended
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Jun. 30, 2021
Postemployment Benefits [Abstract] |
Pension and Other Postretirement Employee Benefit Plans | PENSION AND POSTRETIREMENT EMPLOYEE BENEFIT PLANS The following table details the components of net periodic cost of our company-sponsored pension and other postretirement employee benefit plans for the periods presented:
| Three Months Ended June 30, |  | Six Months Ended June 30,
Pension Benefit Plans | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 0.5 |  |  | $ | 0.6 |  |  | $ | 0.9 |  |  | $ | 1.2 |
Interest cost | 2.1 |  |  | 2.6 |  |  | 4.2 |  |  | 5.2 |
Expected return on plan assets | (2.6) |  |  | (3.7) |  |  | (5.3) |  |  | (7.5) |
Amortization of actuarial loss | 2.6 |  |  | 2.5 |  |  | 5.1 |  |  | 5.0 |
Net periodic cost | $ | 2.5 |  |  | $ | 2.0 |  |  | $ | 5.0 |  |  | $ | 3.9 |
| Three Months Ended June 30, |  | Six Months Ended June 30,
Other Postretirement Employee Benefit Plans | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |
Interest cost | 0.5 |  |  | 0.6 |  |  | $ | 0.9 |  |  | $ | 1.1 |
Net periodic cost | $ | 0.5 |  |  | $ | 0.6 |  |  | $ | 1.0 |  |  | $ | 1.2 |
We record the service component of net periodic cost (benefit) as part of "Cost of sales" and "Selling, general, and administrative expenses," while the non-service components of net periodic cost (benefit) are recorded to "Other non-operating expense" on our Consolidated Statements of Operations. For the three and six months ended June 30, 2021, we recorded $0.4 million and $0.9 million to "Cost of sales" and less than $0.1 million and $0.1 million to "Selling, general, and administrative expenses." For the three and six months ended June 30, 2020, we recorded $0.4 million and $0.7 million to "Cost of sales" and $0.2 million and $0.5 million to "Selling, general, and administrative expenses."

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