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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Income) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 USD ($) retiree | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($)
Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | $ 0.3 | $ 0.3 | $ 0.7 | $ 0.6
Interest cost |  | 46.8 | 45.0 | 92.4 | 92.9
Expected return on plan assets |  | (48.5) | (52.0) | (95.6) | (108.2)
Amortization of prior service benefit |  | (1.2) | (1.1) | (2.3) | (2.3)
Recognized net actuarial loss (gain) |  | 24.5 | 20.4 | 48.5 | 44.0
Settlement losses |  |  |  | 0.0 | 132.3
Net periodic pension and postretirement expense (income) |  | 21.9 | 12.6 | 43.7 | 159.3
Pension Plans | U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 0.0 | 0.0 | 0.0 | 0.0
Interest cost |  | 27.9 | 28.3 | 55.8 | 59.3
Expected return on plan assets |  | (26.3) | (30.2) | (52.6) | (64.6)
Amortization of prior service benefit |  | (0.7) | (0.6) | (1.3) | (1.2)
Recognized net actuarial loss (gain) |  | 18.1 | 15.2 | 36.1 | 33.6
Settlement losses |  |  |  | 0.0 | 132.3
Net periodic pension and postretirement expense (income) |  | 19.0 | 12.7 | 38.0 | 159.4
Group annuity contract to transfer projected benefit obligations, purchase amount | $ 195.0 |  |  |  |
Group annuity contract to transfer projected benefit obligations, number of retirees | retiree | 3,800 |  |  |  |
Pension Plans | International Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 0.3 | 0.3 | 0.7 | 0.6
Interest cost |  | 18.9 | 16.7 | 36.6 | 33.6
Expected return on plan assets |  | (22.2) | (21.8) | (43.0) | (43.6)
Amortization of prior service benefit |  | (0.5) | (0.5) | (1.0) | (1.1)
Recognized net actuarial loss (gain) |  | 6.4 | 5.2 | 12.4 | 10.4
Settlement losses |  |  |  | 0.0 | 0.0
Net periodic pension and postretirement expense (income) |  | 2.9 | (0.1) | 5.7 | (0.1)
Postretirement Benefit Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | 0.1 | 0.0 | 0.1 | 0.1
Interest cost |  | 0.6 | 0.6 | 1.2 | 1.2
Expected return on plan assets |  | 0.0 | (0.1) | (0.1) | (0.1)
Amortization of prior service benefit |  | 0.0 | 0.0 | 0.1 | 0.0
Recognized net actuarial loss (gain) |  | (0.6) | (0.7) | (1.1) | (1.5)
Net periodic pension and postretirement expense (income) |  | $ 0.1 | $ (0.2) | $ 0.2 | $ (0.3)

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