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Pension Benefits and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Benefit Cost | The components of net periodic benefit cost (credit) were as follows:
| Pension Benefits
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in millions) | 2024 |  | 2023 |  | 2024 |  | 2023
Interest cost | $ | 0.3 |  |  | $ | 0.2 |  |  | $ | 0.5 |  |  | $ | 0.5 |
Expected return of plan assets | (0.3) |  |  | (0.3) |  |  | (0.6) |  |  | (0.7) |
Amortization of net loss (gain) | 0.1 |  |  | 0.2 |  |  | 0.2 |  |  | 0.3 |
Net periodic benefit cost (credit) | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |

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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 -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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