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Defined Benefit and Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2023
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | For all plans, the components of net periodic benefit for the three months ended September 30, 2023, and 2022 are as follows:
| Pension |  | Postretirement
(in millions) | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost | $ | (0.2) |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | — |
Interest cost | 7.8 |  |  | 6.9 |  |  | (0.2) |  |  | 0.2 |
Expected return on plan assets | (9.8) |  |  | (15.7) |  |  | — |  |  | — |
Amortization of prior service cost (benefit) | 0.5 |  |  | — |  |  | 0.2 |  |  | (0.3) |
Amortization of net loss | 3.9 |  |  | 3.3 |  |  | 0.2 |  |  | — |
Net periodic loss (benefit) | $ | 2.2 |  |  | $ | (3.8) |  |  | $ | 0.2 |  |  | $ | (0.1) |
For all plans, the components of net periodic benefit for the nine months ended September 30, 2023, and 2022 are as follows:
| Pension |  | Postretirement
(in millions) | 2023 a |  | 2022 |  | 2023 b |  | 2022
Service cost | $ | 2.4 |  |  | $ | 4.3 |  |  | $ | — |  |  | $ | 0.1 |
Interest cost | 26.7 |  |  | 17.4 |  |  | 0.3 |  |  | 0.5 |
Expected return on plan assets | (34.2) |  |  | (43.6) |  |  | — |  |  | — |
Amortization of prior service cost (benefit) | 0.5 |  |  | (0.1) |  |  | (0.3) |  |  | (0.8) |
Amortization of net loss (benefit) | 11.5 |  |  | 12.9 |  |  | (0.2) |  |  | — |
Curtailment and Settlement loss from discontinued operations | 1.9 |  |  | — |  |  | — |  |  | — |
Net periodic loss (benefit) | $ | 8.8 |  |  | $ | (9.1) |  |  | $ | (0.2) |  |  | $ | (0.2) |
a | Includes $1.9 million of pension net periodic loss related to discontinued operations for nine months ended September 30, 2023.
b | Includes $0.2 million of net periodic benefit related to discontinued operations for the nine months ended September 30, 2023.
Schedule of Contributions By Benefit Plan Type | We expect to contribute the following to our pension and postretirement plans:
(in millions) | Pension |  | Postretirement
Expected contributions in 2023 | $ | 18.1 |  |  | $ | 0.5 |
Amounts contributed during the nine months ended September 30, 2023 | $ | 16.1 |  |  | $ | — |

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