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EMPLOYEE BENEFITS | 3 Months Ended
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Mar. 31, 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 March 31
(in millions) |  | 2019 |  | 2018
Service cost |  | $ | 11.3 |  |  | $ | 12.0 |
Interest cost |  | 30.6 |  |  | 28.3 |
Expected return on plan assets |  | (48.7 | ) |  | (49.6 | )
Loss on plan settlement |  | 0.8 |  |  | 0.4 |
Amortization of prior service cost |  | 0.6 |  |  | 0.7 |
Amortization of net actuarial loss |  | 19.0 |  |  | 23.1 |
Net periodic benefit cost |  | $ | 13.6 |  |  | $ | 14.9 |
|  | OPEB Costs
|  | Three Months Ended March 31
(in millions) |  | 2019 |  | 2018
Service cost |  | $ | 4.4 |  |  | $ | 6.2 |
Interest cost |  | 6.5 |  |  | 7.5 |
Expected return on plan assets |  | (13.7 | ) |  | (14.9 | )
Amortization of prior service credit |  | (3.9 | ) |  | (3.8 | )
Amortization of net actuarial (gain) loss |  | (0.7 | ) |  | 0.3 |
Net periodic benefit credit |  | $ | (7.4 | ) |  | $ | (4.7 | )
During the three months ended March 31, 2019, we made contributions and payments of $3.6 million related to our pension plans and $0.6 million related to our OPEB plans. We expect to make contributions and payments of $8.4 million related to our pension plans and $6.1 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 new 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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