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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Income) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 USD ($) retiree | Mar. 31, 2024 USD ($) retiree | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  |  | $ 0.4 | $ 0.4 | $ 1.1 | $ 1.0
Interest cost |  |  | 47.8 | 44.8 | 140.2 | 137.7
Expected return on plan assets |  |  | (57.2) | (51.6) | (152.8) | (159.8)
Amortization of prior service benefit |  |  | (1.1) | (1.2) | (3.4) | (3.5)
Recognized net actuarial loss (gain) |  |  | 25.1 | 19.8 | 73.6 | 63.8
Settlement losses |  |  | 227.7 | 0.0 | 227.7 | 132.3
Net periodic pension and postretirement expense (income) |  |  | 242.7 | 12.2 | 286.4 | 171.5
Pension Plans | U.S. Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  |  | 0.0 | 0.0 | 0.0 | 0.0
Interest cost |  |  | 28.6 | 27.6 | 84.4 | 86.9
Expected return on plan assets |  |  | (34.6) | (29.4) | (87.2) | (94.0)
Amortization of prior service benefit |  |  | (0.6) | (0.7) | (1.9) | (1.9)
Recognized net actuarial loss (gain) |  |  | 18.7 | 14.6 | 54.8 | 48.2
Settlement losses |  |  | 227.7 | 0.0 | 227.7 | 132.3
Net periodic pension and postretirement expense (income) |  |  | 239.8 | 12.1 | 277.8 | 171.5
Group annuity contract to transfer projected benefit obligations, purchase amount | $ 316.0 | $ 195.0 |  |  |  |
Group annuity contract to transfer projected benefit obligations, number of retirees | retiree | 3,150 | 3,800 |  |  |  |
Pension Plans | International Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  |  | 0.4 | 0.4 | 1.1 | 1.0
Interest cost |  |  | 19.2 | 17.2 | 55.8 | 50.8
Expected return on plan assets |  |  | (22.6) | (22.2) | (65.6) | (65.8)
Amortization of prior service benefit |  |  | (0.5) | (0.5) | (1.5) | (1.6)
Recognized net actuarial loss (gain) |  |  | 6.4 | 5.2 | 18.8 | 15.6
Settlement losses |  |  | 0.0 | 0.0 | 0.0 | 0.0
Net periodic pension and postretirement expense (income) |  |  | 2.9 | 0.1 | 8.6 | 0.0
Postretirement Benefit Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service cost |  |  | 0.0 | 0.0 | 0.1 | 0.1
Interest cost |  |  | 0.6 | 0.6 | 1.8 | 1.8
Expected return on plan assets |  |  | 0.0 | 0.0 | (0.1) | (0.1)
Amortization of prior service benefit |  |  | 0.1 | 0.1 | 0.2 | 0.1
Recognized net actuarial loss (gain) |  |  | (0.5) | (0.8) | (1.6) | (2.3)
Net periodic pension and postretirement expense (income) |  |  | $ 0.2 | $ (0.1) | $ 0.4 | $ (0.4)

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