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v3.23.2

Pension and Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Benefit Cost (Credit) | The net periodic benefit cost (credit) for pension and postretirement benefits includes the following components:
|  | Pension |  |  | Postretirement Benefits |
|  | Three Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
|  | (Dollars in Millions) |
Service cost |  | $ | 9.3 |  |  | $ | 14.0 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 14.6 |  |  |  | 11.9 |  |  |  | 0.2 |  |  |  | 0.1 |
Expected return on assets |  |  | (20.3 | ) |  |  | (22.5 | ) |  |  | — |  |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  |  | 1.7 |  |  |  | 1.4 |  |  |  | (0.1 | ) |  |  | (0.2 | )
Actuarial loss (gain) |  |  | 0.2 |  |  |  | 1.2 |  |  |  | (0.2 | ) |  |  | (0.1 | )
Net periodic benefit cost (credit) |  | $ | 5.5 |  |  | $ | 6.0 |  |  | $ | (0.1 | ) |  | $ | (0.2 | )
|  | Pension |  |  | Postretirement Benefits |
|  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
|  | (Dollars in Millions) |
Service cost |  | $ | 16.4 |  |  | $ | 24.0 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 25.7 |  |  |  | 20.6 |  |  |  | 0.2 |  |  |  | 0.2 |
Expected return on assets |  |  | (35.7 | ) |  |  | (38.7 | ) |  |  | — |  |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  |  | 2.9 |  |  |  | 2.5 |  |  |  | (0.1 | ) |  |  | (0.4 | )
Actuarial loss (gain) |  |  | 0.3 |  |  |  | 2.0 |  |  |  | (0.3 | ) |  |  | (0.1 | )
Net periodic benefit cost (credit) |  | $ | 9.6 |  |  | $ | 10.4 |  |  | $ | (0.2 | ) |  | $ | (0.3 | )

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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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