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RETIREMENT BENEFIT PLANS | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
RETIREMENT BENEFIT PLANS | RETIREMENT BENEFIT PLANS The Company has a number of defined benefit pension plans and other postretirement benefit plans covering eligible salaried and hourly employees and their dependents. The estimated contributions to the Company's defined benefit pension plans for 2021 range from $15 million to $25 million, of which $7 million has been contributed through the first three months of the year. The other postretirement benefit plans, which provide medical and life insurance benefits, are funded on a pay-as-you-go basis. The components of net periodic benefit (income) cost recorded in the Condensed Consolidated Statements of Operations are as follows:
|  | Pension benefits |  | Other postretirement employee benefits
(in millions) |  | 2021 |  | 2020 |
Three Months Ended March 31, |  | US |  | Non-US |  | US |  | Non-US |  | 2021 |  | 2020
Service cost |  | $ | — |  |  | $ | 6 |  |  | $ | — |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |
Interest cost |  | 1 |  |  | 8 |  |  | 1 |  |  | 2 |  |  | — |  |  | 1 |
Expected return on plan assets |  | (3) |  |  | (21) |  |  | (3) |  |  | (6) |  |  | — |  |  | — |
Amortization of unrecognized prior service credit |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |
Amortization of unrecognized loss |  | 1 |  |  | 3 |  |  | 1 |  |  | 3 |  |  | — |  |  | — |
Net periodic benefit (income) cost |  | $ | (1) |  |  | $ | (4) |  |  | $ | (1) |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |
The components of net periodic benefit (income) cost other than the service cost component are included in Other postretirement income in the Condensed Consolidated Statements of Operations.

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