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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 0.4 | $ 0.3 | $ 0.8 | $ 0.7
Interest cost | 40.1 | 46.8 | 80.1 | 92.4
Expected return on plan assets | (35.8) | (48.5) | (71.8) | (95.6)
Amortization of prior service benefit | (1.3) | (1.2) | (2.4) | (2.3)
Recognized net actuarial gain | 26.4 | 24.5 | 53.1 | 48.5
Net periodic pension and postretirement expense (income) | 29.8 | 21.9 | 59.8 | 43.7
Pension Plans | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.0
Interest cost | 21.4 | 27.9 | 42.9 | 55.8
Expected return on plan assets | (15.6) | (26.3) | (31.3) | (52.6)
Amortization of prior service benefit | (0.7) | (0.7) | (1.3) | (1.3)
Recognized net actuarial gain | 17.5 | 18.1 | 35.0 | 36.1
Net periodic pension and postretirement expense (income) | 22.6 | 19.0 | 45.3 | 38.0
Pension Plans | International Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.4 | 0.3 | 0.8 | 0.7
Interest cost | 18.7 | 18.9 | 37.2 | 36.6
Expected return on plan assets | (20.2) | (22.2) | (40.5) | (43.0)
Amortization of prior service benefit | (0.6) | (0.5) | (1.1) | (1.0)
Recognized net actuarial gain | 8.9 | 6.4 | 18.1 | 12.4
Net periodic pension and postretirement expense (income) | 7.2 | 2.9 | 14.5 | 5.7
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.0 | 0.1 | 0.0 | 0.1
Interest cost | 0.6 | 0.6 | 1.2 | 1.2
Expected return on plan assets | 0.0 | 0.0 | 0.0 | (0.1)
Amortization of prior service benefit | 0.2 | 0.0 | 0.3 | 0.1
Recognized net actuarial gain | (0.2) | (0.6) | (0.4) | (1.1)
Net periodic pension and postretirement expense (income) | $ 0.6 | $ 0.1 | $ 1.1 | $ 0.2

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