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Benefit Plans and Other Postretirement Benefits, Net pension expense (Details) - Pension Benefits - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Components of net pension expense: |  |  |  |
Service cost | $ 0.9 | $ 1.8 | $ 2.7 | $ 5.5
Interest cost | 6.1 | 6.5 | 18.1 | 19.5
Expected return on plan assets | (7.2) | (7.3) | (21.5) | (21.8)
Amortization of prior service cost | 0.3 | 0.4 | 0.9 | 1.3
Amortization of net actuarial losses | 0.8 | 0.6 | 2.5 | 1.6
Net pension expense | 0.9 | $ 2.0 | 2.7 | $ 6.1
United States |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Estimated future employer contribution in fiscal year | $ 0.0 |  | $ 0.0 |

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