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EMPLOYEE BENEFITS | 9 Months Ended
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Sep. 30, 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 September 30 |  | Nine Months Ended September 30
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost |  | $ | 13.3 |  |  | $ | 12.5 |  |  | $ | 40.8 |  |  | $ | 37.3 |
Interest cost |  | 22.2 |  |  | 25.6 |  |  | 65.8 |  |  | 77.8 |
Expected return on plan assets |  | (50.1) |  |  | (47.4) |  |  | (150.8) |  |  | (143.0) |
Loss on plan settlement |  | 0.9 |  |  | 5.2 |  |  | 2.9 |  |  | 15.5 |
Amortization of prior service cost |  | 0.4 |  |  | 0.4 |  |  | 1.2 |  |  | 1.2 |
Amortization of net actuarial loss |  | 26.4 |  |  | 26.1 |  |  | 82.0 |  |  | 75.8 |
Net periodic benefit cost |  | $ | 13.1 |  |  | $ | 22.4 |  |  | $ | 41.9 |  |  | $ | 64.6 |
|  | OPEB Benefits
|  | Three Months Ended September 30 |  | Nine Months Ended September 30
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost |  | $ | 4.0 |  |  | $ | 3.8 |  |  | $ | 11.8 |  |  | $ | 11.4 |
Interest cost |  | 3.7 |  |  | 4.7 |  |  | 10.9 |  |  | 14.0 |
Expected return on plan assets |  | (16.5) |  |  | (15.0) |  |  | (49.5) |  |  | (45.2) |
Amortization of prior service credit |  | (4.1) |  |  | (3.8) |  |  | (12.0) |  |  | (11.3) |
Amortization of net actuarial gain |  | (5.9) |  |  | (5.6) |  |  | (18.1) |  |  | (16.8) |
Net periodic benefit credit |  | $ | (18.8) |  |  | $ | (15.9) |  |  | $ | (56.9) |  |  | $ | (47.9) |
During the nine months ended September 30, 2021, we made contributions and payments of $9.8 million related to our pension plans and $1.5 million related to our OPEB plans. We expect to make contributions and payments of $1.9 million related to our pension plans and $0.7 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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