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Pension and Postretirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Net Pension and Postretirement Cost | Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the three and nine months ended September 30, 2024 and 2023 are set forth below (in millions):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Pension benefits |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost |  | $ | 2.0 |  |  | $ | 2.4 |  |  | $ | 6.2 |  |  | $ | 7.2 |
Interest cost |  | 7.0 |  |  | 7.5 |  |  | 20.9 |  |  | 22.0 |
Expected return on plan assets |  | (7.7) |  |  | (7.5) |  |  | (23.1) |  |  | (22.1) |
Amortization of net actuarial losses |  | 2.3 |  |  | 2.2 |  |  | 6.7 |  |  | 6.4 |
Amortization of prior service cost |  | 0.4 |  |  | 0.3 |  |  | 1.1 |  |  | 1.0 |
Net periodic pension cost |  | $ | 4.0 |  |  | $ | 4.9 |  |  | $ | 11.8 |  |  | $ | 14.5 |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Postretirement benefits |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |
Interest cost |  | 0.4 |  |  | 0.4 |  |  | 1.2 |  |  | 1.0 |
Amortization of prior service cost |  | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Net periodic postretirement benefit cost |  | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 1.4 |  |  | $ | 1.1 |

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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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