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v3.25.1

Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Income) (Details) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) retiree | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($)
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost |  | $ 0.4 | $ 0.3
Interest cost |  | 45.6 | 47.9
Expected return on plan assets |  | (47.1) | (56.2)
Amortization of prior service benefit |  | (1.1) | (1.2)
Recognized net actuarial loss (gain) |  | 24.0 | 23.6
Settlement losses |  | 0.0 | 132.3
Net periodic postretirement benefit expense (income) |  | 21.8 | 146.7
Pension Plans | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost |  | 0.0 | 0.0
Interest cost |  | 27.9 | 31.0
Expected return on plan assets |  | (26.3) | (34.4)
Amortization of prior service benefit |  | (0.6) | (0.6)
Recognized net actuarial loss (gain) |  | 18.0 | 18.4
Settlement losses |  | 0.0 | 132.3
Net periodic postretirement benefit expense (income) |  | 19.0 | 146.7
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 |  | 0.4 | 0.3
Interest cost |  | 17.7 | 16.9
Expected return on plan assets |  | (20.8) | (21.8)
Amortization of prior service benefit |  | (0.5) | (0.6)
Recognized net actuarial loss (gain) |  | 6.0 | 5.2
Settlement losses |  | 0.0 | 0.0
Net periodic postretirement benefit expense (income) |  | 2.8 | 0.0
Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost |  | 0.0 | 0.1
Interest cost |  | 0.6 | 0.6
Expected return on plan assets |  | (0.1) | 0.0
Amortization of prior service benefit |  | 0.1 | 0.0
Recognized net actuarial loss (gain) |  | (0.5) | (0.8)
Net periodic postretirement benefit expense (income) |  | $ 0.1 | $ (0.1)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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