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Pension and Other Post-Retirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Components of pension and other post retirement benefit costs | The following table shows the components of net periodic cost for the three months ended March 31, 2024 and 2023 (in millions):
| 2024 Pension Benefits |  | 2023 Pension Benefits |  | 2024 Retiree Health and Life |  | 2023 Retiree Health and Life
Service cost | $ | 1.4 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | — |
Interest cost | 4.0 |  |  | 4.2 |  |  | 0.2 |  |  | 0.2 |
Expected return on plan assets | (5.4) |  |  | (5.4) |  |  | — |  |  | — |
Amortization of (1): |  |  |  |  |  |  |
Unrecognized prior service credit | — |  |  | — |  |  | (0.1) |  |  | (0.1) |
Unrecognized net actuarial loss (gain) | 0.2 |  |  | 0.2 |  |  | (0.1) |  |  | (0.1) |
Net periodic cost | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |
_________ (1) Amounts reclassified from accumulated other comprehensive loss.

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- Definition Tabular disclosure of pension and other postretirement benefit arrangements with individual employees, which are generally based on employment contracts between the entity and one or more selected officers or key employees, and which contain a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period and the carrying amount as of the balance sheet date of the related liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 710 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483070/710-10-25-9 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 710 -SubTopic 10 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483043/710-10-30-1 + Details
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