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EMPLOYEE BENEFITS | 9 Months Ended
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Sep. 30, 2017
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) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 11.1 |  |  | $ | 10.9 |  |  | $ | 33.2 |  |  | $ | 32.9 |
Interest cost |  | 30.3 |  |  | 33.2 |  |  | 91.7 |  |  | 99.4 |
Expected return on plan assets |  | (48.8 | ) |  | (49.0 | ) |  | (146.9 | ) |  | (147.0 | )
Loss on plan settlement |  | 2.9 |  |  | 0.7 |  |  | 8.2 |  |  | 14.8 |
Amortization of prior service cost |  | 0.7 |  |  | 0.9 |  |  | 2.2 |  |  | 2.6 |
Amortization of net actuarial loss |  | 21.5 |  |  | 20.4 |  |  | 64.5 |  |  | 61.1 |
Net periodic benefit cost |  | $ | 17.7 |  |  | $ | 17.1 |  |  | $ | 52.9 |  |  | $ | 63.8 |
|  | OPEB Costs
|  | Three Months Ended September 30 |  | Nine Months Ended September 30
(in millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 6.0 |  |  | $ | 6.5 |  |  | $ | 17.9 |  |  | $ | 19.6 |
Interest cost |  | 8.4 |  |  | 9.2 |  |  | 25.3 |  |  | 27.7 |
Expected return on plan assets |  | (13.6 | ) |  | (13.2 | ) |  | (40.9 | ) |  | (39.6 | )
Amortization of prior service credit |  | (2.8 | ) |  | (2.3 | ) |  | (8.4 | ) |  | (7.0 | )
Amortization of net actuarial loss |  | 0.7 |  |  | 2.2 |  |  | 2.3 |  |  | 6.4 |
Net periodic benefit (credit) cost |  | $ | (1.3 | ) |  | $ | 2.4 |  |  | $ | (3.8 | ) |  | $ | 7.1 |
During the nine months ended September 30, 2017, we made payments of $109.8 million to our pension plans and $5.6 million to our OPEB plans. We expect to make payments of $3.8 million related to our pension plans and $3.9 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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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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