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Pension and Postretirement Benefit Costs - Schedule of Net Periodic Benefit (Benefit) Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic pension cost | $ (10.1) | $ (10.0) | $ (30.4) | $ (29.4)
Defined benefit pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 0.1 | 0.1 | 0.1 | 0.1
Interest cost on projected benefit obligation | 1.7 | 3.6 | 4.9 | 18.4
Expected return on plan assets | (1.3) | (3.1) | (3.7) | (16.3)
Net periodic pension cost | 0.5 | 0.6 | 1.3 | 2.2
Postretirement benefit plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 0.1 | 0.1 | 0.3 | 0.4
Interest cost on projected benefit obligation | 2.3 | 2.6 | 6.9 | 7.6
Expected return on plan assets | (0.1) | (0.1) | (0.3) | (0.4)
Amortization of prior service credit | (13.3) | (13.5) | (39.8) | (40.3)
Net periodic pension cost | $ (11.0) | $ (10.9) | $ (32.9) | $ (32.7)

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