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Pension and Postretirement Benefit Costs - Schedule of Net Periodic Benefit (Benefit) Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic pension cost (credit) | $ (9.7) | $ (12.3) | $ (19.4) | $ (24.5)
Defined benefit pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost on projected benefit obligation | 7.4 | 5.4 | 14.8 | 10.7
Expected return on plan assets | (6.6) | (6.0) | (13.2) | (11.9)
Net periodic pension cost (credit) | 0.8 | (0.6) | 1.6 | (1.2)
Postretirement benefit plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 0.2 | 0.2 | 0.3 | 0.4
Interest cost on projected benefit obligation | 2.5 | 1.8 | 5.0 | 3.5
Expected return on plan assets | (0.2) | (0.2) | (0.3) | (0.4)
Amortization of prior service credit | (13.4) | (13.5) | (26.8) | (26.9)
Net periodic pension cost (credit) | $ (10.9) | $ (11.7) | $ (21.8) | $ (23.4)

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