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Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Pensions |  |
Components of net annual benefit cost (income): |  |
Service cost | $ 0.8 | $ 0.7
Interest cost | 11.9 | 12.6
Expected return on plan assets | (11.2) | (11.9)
Amortization of net actuarial and other (gain) loss | 3.5 | 4.0
Recognized (gain) loss due to curtailments, settlements, and other | (0.1) | 0.0
Net periodic benefit cost (income) | 5.1 | 5.4
Other Benefits |  |
Components of net annual benefit cost (income): |  |
Service cost | 0.0 | 0.0
Interest cost | 0.1 | 0.1
Expected return on plan assets | 0.0 | 0.0
Amortization of net actuarial and other (gain) loss | (0.2) | (0.2)
Recognized (gain) loss due to curtailments, settlements, and other | 0.0 | 0.0
Net periodic benefit cost (income) | $ (0.1) | $ (0.1)

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