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Pension and Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit | For all plans, the components of net periodic benefit for the three months ended June 30, 2024, and 2023 are as follows:
| Pension |  | Postretirement
(in millions) | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 0.6 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | — |
Interest cost | 0.5 |  |  | 0.6 |  |  | 0.2 |  |  | 0.2 |
Expected return on plan assets | (0.8) |  |  | (0.8) |  |  | — |  |  | — |
Amortization of prior service cost | (0.2) |  |  | (0.2) |  |  | (0.2) |  |  | (0.2) |
Amortization of net gain | — |  |  | — |  |  | (0.2) |  |  | (0.2) |
Net periodic expense (benefit) | $ | 0.1 |  |  | $ | — |  |  | $ | (0.2) |  |  | $ | (0.2) |
For all plans, the components of net periodic benefit for the six months ended June 30, 2024, and 2023 are as follows:
| Pension |  | Postretirement
(in millions) | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 1.1 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | — |
Interest cost | 1.0 |  |  | 1.1 |  |  | 0.3 |  |  | 0.4 |
Expected return on plan assets | (1.6) |  |  | (1.6) |  |  | — |  |  | — |
Amortization of prior service cost | (0.4) |  |  | (0.4) |  |  | (0.4) |  |  | (0.5) |
Amortization of net loss (gain) | 0.1 |  |  | — |  |  | (0.4) |  |  | (0.3) |
Net periodic expense (benefit) | $ | 0.2 |  |  | $ | — |  |  | $ | (0.5) |  |  | $ | (0.4) |
Expected Contributions to Pension and Postretirement Plans | We expect to contribute the following to our pension and postretirement plans:
(in millions) | Pension |  | Postretirement
Expected contributions in 2024 | $ | 2.0 |  |  | $ | 1.3 |
Amounts contributed during the six months ended June 30, 2024 | $ | 1.1 |  |  | $ | 1.2 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details
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