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EMPLOYEE BENEFITS | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [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) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 11.8 |  |  | $ | 11.8 |  |  | $ | 23.1 |  |  | $ | 23.8 |
Interest cost |  | 30.2 |  |  | 28.7 |  |  | 60.8 |  |  | 57.0 |
Expected return on plan assets |  | (48.2 | ) |  | (48.8 | ) |  | (96.9 | ) |  | (98.4 | )
Loss on plan settlement |  | 1.0 |  |  | 0.3 |  |  | 1.8 |  |  | 0.7 |
Amortization of prior service cost |  | 0.5 |  |  | 0.6 |  |  | 1.1 |  |  | 1.3 |
Amortization of net actuarial loss |  | 18.7 |  |  | 23.9 |  |  | 37.7 |  |  | 47.0 |
Net periodic benefit cost |  | $ | 14.0 |  |  | $ | 16.5 |  |  | $ | 27.6 |  |  | $ | 31.4 |
|  | OPEB Costs
|  | Three Months Ended June 30 |  | Six Months Ended June 30
(in millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 3.8 |  |  | $ | 5.6 |  |  | $ | 8.2 |  |  | $ | 11.8 |
Interest cost |  | 6.3 |  |  | 7.4 |  |  | 12.8 |  |  | 14.9 |
Expected return on plan assets |  | (13.6 | ) |  | (14.8 | ) |  | (27.3 | ) |  | (29.7 | )
Amortization of prior service credit |  | (3.8 | ) |  | (3.9 | ) |  | (7.7 | ) |  | (7.7 | )
Amortization of net actuarial (gain) loss |  | (2.0 | ) |  | 0.2 |  |  | (2.7 | ) |  | 0.5 |
Net periodic benefit credit |  | $ | (9.3 | ) |  | $ | (5.5 | ) |  | $ | (16.7 | ) |  | $ | (10.2 | )
During the six months ended June 30, 2019, we made contributions and payments of $6.9 million related to our pension plans and $1.4 million related to our OPEB plans. We expect to make contributions and payments of $4.9 million related to our pension plans and $5.3 million related to our OPEB plans during the remainder of 2019, dependent upon various factors affecting us, including our liquidity position and the effects of the Tax Legislation.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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