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Employee Benefit Plans | 3 Months Ended
--- | ---
Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract] |
Employee Benefit Plans | 8. Employee Benefit Plans The components of net periodic cost for our defined benefit pension plan and for our postretirement benefit plan are included in the following tables:
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Net Periodic Pension Cost |  | (Dollars in millions) |
Interest cost |  | $ | 1.7 |  |  | $ | 3.2 |
Actuarial loss amortization |  |  | 4.3 |  |  |  | 3.9 |
Less: Expected return on plan assets |  |  | (3.3 | ) |  |  | (5.7 | )
Net periodic pension cost |  | $ | 2.7 |  |  | $ | 1.4 |
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Net Periodic Postretirement Benefit |  | (Dollars in millions) |
Interest cost |  | $ | — |  |  | $ | 0.1 |
Actuarial gain amortization |  |  | (0.5 | ) |  |  | (0.6 | )
Prior service credit amortization |  |  | — |  |  |  | (0.1 | )
Net periodic postretirement benefit gain |  | $ | (0.5 | ) |  | $ | (0.6 | )

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