| 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 | | $ | 3.2 |
| | $ | 3.3 |
| | $ | 9.5 |
| | $ | 9.9 |
| Interest cost | | 11.3 |
| | 10.6 |
| | 33.9 |
| | 31.7 |
| Expected return on plan assets | | (18.1 | ) | | (18.8 | ) | | (54.3 | ) | | (56.4 | ) | Amortization of prior service cost | | 0.2 |
| | 0.2 |
| | 0.4 |
| | 0.6 |
| Amortization of net actuarial loss | | 7.0 |
| | 9.5 |
| | 21.0 |
| | 28.5 |
| Net periodic benefit cost | | $ | 3.6 |
| | $ | 4.8 |
| | $ | 10.5 |
| | $ | 14.3 |
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| | | | | | | | | | | | | | | | | | | | OPEB Costs | | | Three Months Ended September 30 | | Nine Months Ended September 30 | (in millions) | | 2019 | | 2018 | | 2019 | | 2018 | Service cost | | $ | 1.2 |
| | $ | 1.7 |
| | $ | 3.4 |
| | $ | 5.2 |
| Interest cost | | 2.3 |
| | 2.8 |
| | 7.1 |
| | 8.3 |
| Expected return on plan assets | | (3.6 | ) | | (3.8 | ) | | (10.7 | ) | | (11.6 | ) | Amortization of prior service credit | | (0.4 | ) | | (0.6 | ) | | (1.4 | ) | | (1.7 | ) | Amortization of net actuarial gain | | (0.5 | ) | | — |
| | (1.6 | ) | | — |
| Net periodic benefit (credit) cost | | $ | (1.0 | ) | | $ | 0.1 |
| | $ | (3.2 | ) | | $ | 0.2 |
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During the nine months ended September 30, 2019, we made contributions and payments of $3.4 million related to our pension plans and $1.2 million related to our OPEB plans. We expect to make contributions and payments of $0.4 million related to our pension plans and $2.4 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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