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Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Pensions |  |  |  |
Components of net annual benefit cost (income): |  |  |  |
Service cost | $ 0.7 | $ 0.7 | $ 1.5 | $ 1.4
Interest cost | 11.9 | 12.5 | 23.9 | 25.1
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 | 7.0 | 7.9
Recognized (gain) loss due to curtailments, settlements, and other | (0.1) | 0.0 | (0.2) | 0.0
Net periodic benefit cost (income) | 5.0 | 5.3 | 10.2 | 10.7
Other Benefits |  |  |  |
Components of net annual benefit cost (income): |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.0
Interest cost | 0.1 | 0.2 | 0.2 | 0.3
Expected return on plan assets | 0.0 | 0.0 | 0.0 | 0.0
Amortization of net actuarial and other (gain) loss | (0.2) | (0.2) | (0.4) | (0.4)
Recognized (gain) loss due to curtailments, settlements, and other | 0.0 | 0.0 | 0.0 | 0.0
Net periodic benefit cost (income) | $ (0.1) | $ 0.0 | $ (0.2) | $ (0.1)

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