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EMPLOYEE BENEFITS | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
EMPLOYEE BENEFITS | EMPLOYEE BENEFITS The following tables show the components of net periodic pension and OPEB costs for our benefit plans.
|  | Pension Costs
|  | Three Months Ended June 30 |  | Six Months Ended June 30
(in millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 10.4 |  |  | $ | 10.7 |  |  | $ | 22.1 |  |  | $ | 22.0 |
Interest cost |  | 30.2 |  |  | 33.0 |  |  | 61.4 |  |  | 66.2 |
Expected return on plan assets |  | (48.5 | ) |  | (49.0 | ) |  | (98.1 | ) |  | (98.0 | )
Loss on plan settlement |  | 5.3 |  |  | 14.1 |  |  | 5.3 |  |  | 14.1 |
Amortization of prior service cost |  | 0.8 |  |  | 0.8 |  |  | 1.5 |  |  | 1.7 |
Amortization of net actuarial loss |  | 21.1 |  |  | 20.2 |  |  | 43.0 |  |  | 40.7 |
Net periodic benefit cost |  | $ | 19.3 |  |  | $ | 29.8 |  |  | $ | 35.2 |  |  | $ | 46.7 |
|  | OPEB Costs
|  | Three Months Ended June 30 |  | Six Months Ended June 30
(in millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 5.6 |  |  | $ | 6.4 |  |  | $ | 11.9 |  |  | $ | 13.1 |
Interest cost |  | 8.4 |  |  | 9.3 |  |  | 16.9 |  |  | 18.5 |
Expected return on plan assets |  | (13.6 | ) |  | (13.3 | ) |  | (27.3 | ) |  | (26.4 | )
Amortization of prior service credit |  | (2.8 | ) |  | (2.4 | ) |  | (5.6 | ) |  | (4.7 | )
Amortization of net actuarial loss |  | 0.1 |  |  | 1.9 |  |  | 1.6 |  |  | 4.2 |
Net periodic benefit (credit) cost |  | $ | (2.3 | ) |  | $ | 1.9 |  |  | $ | (2.5 | ) |  | $ | 4.7 |
During the six months ended June 30, 2017, we made payments of $107.2 million to our pension plans and $4.3 million to our OPEB plans. We expect to make payments of $6.4 million related to our pension plans and $5.3 million related to our OPEB plans during the remainder of 2017, dependent upon various factors affecting us, including our liquidity position and possible tax law changes.

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