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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract] |
Components of Net Periodic Cost for Defined Benefit Pension Plan and for Postretirement Benefit Plan | 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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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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