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Pensions and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Pensions and Other Postretirement Benefits | Pensions and Other Postretirement Benefits The following table summarizes the components of net annual benefit cost (income):
(in Millions) | Three Months Ended June 30, |  | Six Months Ended June 30,
Pensions |  | Other Benefits |  | Pensions |  | Other Benefits
2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 0.7 |  |  | $ | 0.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 1.5 |  |  | $ | 1.4 |  |  | $ | — |  |  | $ | — |
Interest cost | 11.9 |  |  | 12.5 |  |  | 0.1 |  |  | 0.2 |  |  | 23.9 |  |  | 25.1 |  |  | 0.2 |  |  | 0.3 |
Expected return on plan assets | (11.2) |  |  | (11.8) |  |  | — |  |  | — |  |  | (22.4) |  |  | (23.7) |  |  | — |  |  | — |
Amortization of net actuarial and other (gain) loss | 3.5 |  |  | 3.9 |  |  | (0.2) |  |  | (0.2) |  |  | 7.0 |  |  | 7.9 |  |  | (0.4) |  |  | (0.4) |
Recognized (gain) loss due to curtailments, settlements, and other | 0.1 |  |  | — |  |  | — |  |  | — |  |  | 0.2 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | 5.0 |  |  | $ | 5.3 |  |  | $ | (0.1) |  |  | $ | — |  |  | $ | 10.2 |  |  | $ | 10.7 |  |  | $ | (0.2) |  |  | $ | (0.1) |

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