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EMPLOYEE BENEFITS | 9 Months Ended
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Sep. 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 September 30 |  | Nine Months Ended September 30
(in millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 11.6 |  |  | $ | 11.9 |  |  | $ | 34.7 |  |  | $ | 35.7 |
Interest cost |  | 30.3 |  |  | 28.5 |  |  | 91.1 |  |  | 85.5 |
Expected return on plan assets |  | (48.3 | ) |  | (49.2 | ) |  | (145.2 | ) |  | (147.6 | )
Loss on plan settlement |  | 7.8 |  |  | 0.4 |  |  | 9.6 |  |  | 1.1 |
Amortization of prior service cost |  | 0.5 |  |  | 0.7 |  |  | 1.6 |  |  | 2.0 |
Amortization of net actuarial loss |  | 18.9 |  |  | 23.6 |  |  | 56.6 |  |  | 70.6 |
Net periodic benefit cost |  | $ | 20.8 |  |  | $ | 15.9 |  |  | $ | 48.4 |  |  | $ | 47.3 |
|  | OPEB Costs
|  | Three Months Ended September 30 |  | Nine Months Ended September 30
(in millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 4.1 |  |  | $ | 5.9 |  |  | $ | 12.3 |  |  | $ | 17.7 |
Interest cost |  | 6.5 |  |  | 7.5 |  |  | 19.3 |  |  | 22.4 |
Expected return on plan assets |  | (13.7 | ) |  | (14.9 | ) |  | (41.0 | ) |  | (44.6 | )
Amortization of prior service credit |  | (3.9 | ) |  | (3.8 | ) |  | (11.6 | ) |  | (11.5 | )
Amortization of net actuarial (gain) loss |  | (2.0 | ) |  | 0.3 |  |  | (4.7 | ) |  | 0.8 |
Net periodic benefit credit |  | $ | (9.0 | ) |  | $ | (5.0 | ) |  | $ | (25.7 | ) |  | $ | (15.2 | )
During the nine months ended September 30, 2019, we made contributions and payments of $9.6 million related to our pension plans and $2.5 million related to our OPEB plans. We expect to make contributions and payments of $52.2 million related to our pension plans and $4.1 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 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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