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EMPLOYEE BENEFITS | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
EMPLOYEE BENEFITS | EMPLOYEE BENEFITS The following tables show the components of net periodic benefit cost (credit) for our benefit plans.
|  |  |  |  |  | Pension Benefits
|  |  |  | Three Months Ended March 31
(in millions) |  |  |  |  |  | 2021 |  | 2020
Service cost |  |  |  |  |  | $ | 13.9 |  |  | $ | 13.1 |
Interest cost |  |  |  |  |  | 21.9 |  |  | 26.1 |
Expected return on plan assets |  |  |  |  |  | (50.6) |  |  | (47.9) |
Loss on plan settlement |  |  |  |  |  | 0.1 |  |  | 0.3 |
Amortization of prior service cost |  |  |  |  |  | 0.4 |  |  | 0.4 |
Amortization of net actuarial loss |  |  |  |  |  | 27.4 |  |  | 24.2 |
Net periodic benefit cost |  |  |  |  |  | $ | 13.1 |  |  | $ | 16.2 |
|  |  |  |  |  | OPEB Benefits
|  |  |  | Three Months Ended March 31
(in millions) |  |  |  |  |  | 2021 |  | 2020
Service cost |  |  |  |  |  | $ | 4.2 |  |  | $ | 4.1 |
Interest cost |  |  |  |  |  | 3.6 |  |  | 4.7 |
Expected return on plan assets |  |  |  |  |  | (16.4) |  |  | (15.1) |
Amortization of prior service credit |  |  |  |  |  | (4.0) |  |  | (3.7) |
Amortization of net actuarial gain |  |  |  |  |  | (5.7) |  |  | (5.4) |
Net periodic benefit credit |  |  |  |  |  | $ | (18.3) |  |  | $ | (15.4) |
During the three months ended March 31, 2021, we made contributions and payments of $3.6 million related to our pension plans and $0.5 million related to our OPEB plans. We expect to make contributions and payments of $7.9 million related to our pension plans and $1.6 million related to our OPEB plans during the remainder of 2021, dependent upon various factors affecting us, including our liquidity position and possible tax law changes.

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