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Employee Benefit Plans and Other Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2023
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Costs | The components of net periodic benefit cost for our pension plans were as follows (dollars in millions):
|  | Pension Plans |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 3.3 |  |  | $ | 4.6 |  |  | $ | 10.5 |  |  | $ | 14.4 |
Interest cost |  |  | 13.8 |  |  |  | 8.6 |  |  |  | 41.9 |  |  |  | 26.0 |
Expected return on plan assets |  |  | (14.2 | ) |  |  | (13.9 | ) |  |  | (42.8 | ) |  |  | (41.8 | )
Net amortization of unrecognized amounts |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | 1.3 |  |  |  | 0.9 |  |  |  | 3.9 |  |  |  | 2.7 |
Actuarial loss |  |  | 1.0 |  |  |  | 0.9 |  |  |  | 3.1 |  |  |  | 2.6 |
Net periodic benefit cost |  | $ | 5.2 |  |  | $ | 1.1 |  |  | $ | 16.6 |  |  | $ | 3.9 |

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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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