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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2025
Retirement Benefits [Abstract] |
Schedule of Changes in Projected Benefit Obligations and Fair Value of Plan Assets | The following table provides the changes in the benefit obligation and fair value of plan assets and the funded status of the plans.
| Pension Benefits |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
| (in millions of dollars)
Change in Benefit Obligation |  |  |  |  |  |  |  |  |  |  |
Benefit Obligation at Beginning of Year | $ | 1,518.6 |  |  | $ | 1,575.3 |  |  | $ | 152.1 |  |  | $ | 172.3 |  |  | $ | 72.8 |  |  | $ | 79.0 |
Service Cost | 9.4 |  |  | 9.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Interest Cost | 85.5 |  |  | 82.9 |  |  | 8.6 |  |  | 7.6 |  |  | 4.0 |  |  | 4.0 |
Plan Participant Contributions | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.1 |
Actuarial Loss (Gain) (1) | 8.7 |  |  | (57.7) |  |  | (6.4) |  |  | (19.3) |  |  | 2.1 |  |  | (1.5) |
Benefits and Expenses Paid | (94.9) |  |  | (91.1) |  |  | (5.7) |  |  | (5.9) |  |  | (8.5) |  |  | (8.8) |
Settlement | (367.2) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Change in Foreign Exchange Rates | — |  |  | — |  |  | 11.6 |  |  | (2.6) |  |  | — |  |  | — |
Benefit Obligation at End of Year | $ | 1,160.1 |  |  | $ | 1,518.6 |  |  | $ | 160.2 |  |  | $ | 152.1 |  |  | $ | 70.4 |  |  | $ | 72.8 |
Accumulated Benefit Obligation at December 31 | $ | 1,160.1 |  |  | $ | 1,518.6 |  |  | $ | 160.2 |  |  | $ | 152.1 |  |  | N/A |  | N/A
Change in Fair Value of Plan Assets |  |  |  |  |  |  |  |  |  |  |
Fair Value of Plan Assets at Beginning of Year | $ | 1,241.6 |  |  | $ | 1,295.9 |  |  | $ | 125.3 |  |  | $ | 145.4 |  |  | $ | 7.9 |  |  | $ | 8.2 |
Actual Return on Plan Assets | 147.3 |  |  | 27.1 |  |  | 5.1 |  |  | (12.1) |  |  | — |  |  | 0.1 |
Employer Contributions | 10.3 |  |  | 9.7 |  |  | 19.2 |  |  | — |  |  | 8.0 |  |  | 8.3 |
Plan Participant Contributions | — |  |  | — |  |  | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Benefits and Expenses Paid | (94.9) |  |  | (91.1) |  |  | (5.7) |  |  | (5.9) |  |  | (8.5) |  |  | (8.8) |
Settlement | (367.2) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Change in Foreign Exchange Rates | — |  |  | — |  |  | 10.0 |  |  | (2.1) |  |  | — |  |  | — |
Fair Value of Plan Assets at End of Year | $ | 937.1 |  |  | $ | 1,241.6 |  |  | $ | 153.9 |  |  | $ | 125.3 |  |  | $ | 7.5 |  |  | $ | 7.9 |
Underfunded Status | $ | 223.0 |  |  | $ | 277.0 |  |  | $ | 6.3 |  |  | $ | 26.8 |  |  | $ | 62.9 |  |  | $ | 64.9 |
(1) The actuarial loss recognized in 2025 for the U.S. plans was driven by unfavorable demographic experience. The actuarial gain recognized in 2025 for the U.K. plan was driven by a decrease in inflation-related assumptions and an increase in the discount rate assumption. The actuarial loss recognized in 2025 for the OPEB plan was driven by a decrease in the discount rate assumption. The actuarial gains recognized in 2024 for the U.S., U.K., and OPEB plans were driven by increases in the discount rate assumption.
Schedule of Amounts Recognized in Balance Sheet | The amounts recognized in our consolidated balance sheets for our pension and OPEB plans at December 31, 2025 and 2024 are as follows.
| Pension Benefits |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
| (in millions of dollars)
Current Liability | $ | 9.7 |  |  | $ | 9.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.7 |  |  | $ | 0.7 |
Noncurrent Liability | 213.3 |  |  | 267.6 |  |  | 6.3 |  |  | 26.8 |  |  | 62.2 |  |  | 64.2 |
Underfunded Status | $ | 223.0 |  |  | $ | 277.0 |  |  | $ | 6.3 |  |  | $ | 26.8 |  |  | $ | 62.9 |  |  | $ | 64.9 |
Unrecognized Pension and Postretirement Benefit Costs |  |  |  |  |  |  |  |  |  |  |
Net Actuarial Gain (Loss) | $ | (325.8) |  |  | $ | (496.0) |  |  | $ | (93.2) |  |  | $ | (91.7) |  |  | $ | 17.7 |  |  | $ | 21.2 |
Prior Service Credit (Cost) | (0.5) |  |  | (0.5) |  |  | (0.2) |  |  | (0.2) |  |  | 1.8 |  |  | 2.1 |
| (326.3) |  |  | (496.5) |  |  | (93.4) |  |  | (91.9) |  |  | 19.5 |  |  | 23.3 |
Income Tax | 163.4 |  |  | 200.1 |  |  | 21.7 |  |  | 21.4 |  |  | 4.2 |  |  | 3.4 |
Total Included in Accumulated Other Comprehensive Income (Loss) | $ | (162.9) |  |  | $ | (296.4) |  |  | $ | (71.7) |  |  | $ | (70.5) |  |  | $ | 23.7 |  |  | $ | 26.7 |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) | The following table provides the changes recognized in other comprehensive income for the years ended December 31, 2025 and 2024.
| Pension Benefits |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
| (in millions of dollars)
Accumulated Other Comprehensive Income (Loss) at Beginning of Year | $ | (296.4) |  |  | $ | (299.6) |  |  | $ | (70.5) |  |  | $ | (73.0) |  |  | $ | 26.7 |  |  | $ | 26.9 |
Net Actuarial Gain (Loss) |  |  |  |  |  |  |  |  |  |  |
Amortization | 14.9 |  |  | 14.6 |  |  | 2.9 |  |  | 2.9 |  |  | (1.2) |  |  | (1.1) |
All Other Changes | 51.5 |  |  | (0.4) |  |  | (4.4) |  |  | 0.4 |  |  | (2.3) |  |  | 1.1 |
Prior Service Credit (Cost) |  |  |  |  |  |  |  |  |  |  |
Amortization | — |  |  | 0.1 |  |  | — |  |  | — |  |  | (0.3) |  |  | (0.2) |
Settlement Loss | 103.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Change in Income Tax | (36.7) |  |  | (11.1) |  |  | 0.3 |  |  | (0.8) |  |  | 0.8 |  |  | — |
Accumulated Other Comprehensive Income (Loss) at End of Year | $ | (162.9) |  |  | $ | (296.4) |  |  | $ | (71.7) |  |  | $ | (70.5) |  |  | $ | 23.7 |  |  | $ | 26.7 |
Defined Benefit Plan, Plan Assets, Category | The categorization of fair value measurements by input level for the invested assets in our U.S. plans is shown below. The carrying values of investment-related receivables and payables approximate fair value due to the short-term nature of the securities and are not included in the following chart. Investments valued using NAV as a practical expedient are not required to be categorized by input level, but these investments are included as follows to reconcile to total invested assets.
| December 31, 2025
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | NAV as a Practical Expedient |  | Total
| (in millions of dollars)
Invested Assets |  |  |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |  |  |
Global | $ | 32.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 228.0 |  |  | $ | 260.1 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |
U.S. Government and Agencies 1 | 323.5 |  |  | (7.8) |  |  | — |  |  | — |  |  | 315.7 |
Corporate | — |  |  | — |  |  | — |  |  | 92.9 |  |  | 92.9 |
Non-U.S. Emerging Markets | — |  |  | — |  |  | — |  |  | 44.6 |  |  | 44.6 |
Opportunistic Credits | — |  |  | — |  |  | — |  |  | 82.9 |  |  | 82.9 |
Real Estate | — |  |  | — |  |  | — |  |  | 177.6 |  |  | 177.6 |
Alternative Investments: |  |  |  |  |  |  |  |  |
Private Equity Direct Investments | — |  |  | — |  |  | — |  |  | 56.3 |  |  | 56.3 |
Private Equity Funds of Funds | — |  |  | — |  |  | — |  |  | 30.3 |  |  | 30.3 |
Repurchase Agreements | — |  |  | (141.9) |  |  | — |  |  | — |  |  | (141.9) |
Cash Equivalents | 26.6 |  |  | — |  |  | — |  |  | — |  |  | 26.6 |
Net Invested Assets | $ | 382.2 |  |  | $ | (149.7) |  |  | $ | — |  |  | $ | 712.6 |  |  | $ | 945.1 |
1 Includes derivatives which hedge the risk associated with certain U.S. Government and Agencies Securities.
| December 31, 2024
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | NAV as a Practical Expedient |  | Total
| (in millions of dollars)
Invested Assets |  |  |  |  |  |  |  |  |
Equity Securities: |  |  |  |  |  |  |  |  |
Global | $ | 52.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 372.3 |  |  | $ | 424.8 |
Fixed Income Securities: |  |  |  |  |  |  |  |  |
U.S. Government and Agencies 1 | 357.5 |  |  | (16.1) |  |  | — |  |  | — |  |  | 341.4 |
Corporate | — |  |  | — |  |  | — |  |  | 124.1 |  |  | 124.1 |
Non-U.S. Emerging Markets | — |  |  | — |  |  | — |  |  | 32.4 |  |  | 32.4 |
Opportunistic Credits | — |  |  | — |  |  | — |  |  | 139.6 |  |  | 139.6 |
Real Estate | — |  |  | — |  |  | — |  |  | 166.1 |  |  | 166.1 |
Alternative Investments: |  |  |  |  |  |  |  |  |
Private Equity Direct Investments | — |  |  | — |  |  | — |  |  | 63.1 |  |  | 63.1 |
Private Equity Funds of Funds | — |  |  | — |  |  | — |  |  | 35.2 |  |  | 35.2 |
Repurchase Agreements | — |  |  | (123.0) |  |  | — |  |  | — |  |  | (123.0) |
Cash Equivalents | 17.2 |  |  | — |  |  | — |  |  | — |  |  | 17.2 |
Net Invested Assets | $ | 427.2 |  |  | $ | (139.1) |  |  | $ | — |  |  | $ | 932.8 |  |  | $ | 1,220.9 |
1 Includes derivatives which hedge the risk associated with certain U.S. Government and Agencies Securities. Prior year amounts in the table above were reclassified to conform to current year presentation. The categorization of fair value measurements by input level for the invested assets in our U.K. plan is shown below. The carrying values of investment-related receivables and payables approximate fair value due to the short-term nature of the securities and are not included in the following chart. Investments valued using NAV as a practical expedient are not required to be categorized by input level, but these investments are included as follows to reconcile to total invested assets.
| December 31, 2025
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | NAV as a Practical Expedient |  | Total
| (in millions of dollars)
Invested Assets |  |  |  |  |  |  |  |  |
Diversified Growth Assets | $ | 64.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 64.7 |
Liability Driven Investments | — |  |  | 56.3 |  |  | — |  |  | — |  |  | 56.3 |
Alternative Investments | — |  |  | — |  |  | — |  |  | 30.9 |  |  | 30.9 |
Cash Equivalents | 2.6 |  |  | — |  |  | — |  |  | — |  |  | 2.6 |
Total Invested Assets | $ | 67.3 |  |  | $ | 56.3 |  |  | $ | — |  |  | $ | 30.9 |  |  | $ | 154.5 |
| December 31, 2024
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | NAV as a Practical Expedient |  | Total
| (in millions of dollars)
Invested Assets |  |  |  |  |  |  |  |  |
Diversified Growth Assets | $ | 25.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 9.8 |  |  | $ | 35.4 |
Fixed Income and Index-linked Securities | 50.5 |  |  | — |  |  | — |  |  | — |  |  | 50.5 |
Alternative Investments | — |  |  | — |  |  | — |  |  | 34.5 |  |  | 34.5 |
Cash Equivalents | 5.3 |  |  | — |  |  | — |  |  | — |  |  | 5.3 |
Total Invested Assets | $ | 81.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 44.3 |  |  | $ | 125.7 |
The categorization of fair value measurements by input level for the assets in our OPEB plan is as follows:
| December 31, 2025
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Assets |  |  |  |  |  |  |
Life Insurance Contracts | $ | — |  |  | $ | — |  |  | $ | 7.5 |  |  | $ | 7.5 |
| December 31, 2024
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (in millions of dollars)
Assets |  |  |  |  |  |  |
Life Insurance Contracts | $ | — |  |  | $ | — |  |  | $ | 7.9 |  |  | $ | 7.9 |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets | Changes in our OPEB plan assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2025 and 2024 are as follows:
| Year Ended December 31, 2025
| Beginning of Year |  | Actual Return on Plan Assets |  | Contributions |  | Net Benefits and Expenses Paid |  | End of Year
| (in millions of dollars)
Life Insurance Contracts | $ | 7.9 |  |  | $ | — |  |  | $ | 8.1 |  |  | $ | (8.5) |  |  | $ | 7.5 |
| Year Ended December 31, 2024
| Beginning of Year |  | Actual Return on Plan Assets |  | Contributions |  | Net Benefits and Expenses Paid |  | End of Year
| (in millions of dollars)
Life Insurance Contracts | $ | 8.2 |  |  | $ | 0.1 |  |  | $ | 8.4 |  |  | $ | (8.8) |  |  | $ | 7.9 |
Schedule of Assumptions Used | We use a December 31 measurement date for each of our plans. The weighted average assumptions used in the measurement of our benefit obligations as of December 31 and our net periodic benefit costs for the years ended December 31 are as follows:
| Pension Benefits |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Benefit Obligations |  |  |  |  |  |  |  |  |  |  |
Discount Rate | 5.80 | % |  | 5.80 | % |  | 5.60 | % |  | 5.50 | % |  | 5.40 | % |  | 5.80 | %
Rate of Compensation Increase | N/A |  | N/A |  | 2.30 | % |  | 2.50 | % |  | N/A |  | N/A
Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |
Discount Rate | 5.80 | % |  | 5.40 | % |  | 5.50 | % |  | 4.50 | % |  | 5.80 | % |  | 5.40 | %
Expected Return on Plan Assets | 7.25 | % |  | 7.25 | % |  | 7.40 | % |  | 6.50 | % |  | 5.75 | % |  | 5.75 | %
Rate of Compensation Increase | N/A |  | N/A |  | 2.40 | % |  | 2.40 | % |  | N/A |  | N/A
Schedule of Net Benefit Costs | The following table provides the components of the net periodic benefit cost (credit) for the years ended December 31.
| Pension Benefits |  |  |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023
| (in millions of dollars)
Service Cost | $ | 9.4 |  |  | $ | 9.2 |  |  | $ | 9.2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest Cost | 85.5 |  |  | 82.9 |  |  | 87.9 |  |  | 8.6 |  |  | 7.6 |  |  | 7.7 |  |  | 4.0 |  |  | 4.0 |  |  | 4.5 |
Expected Return on Plan Assets | (87.2) |  |  | (91.3) |  |  | (92.0) |  |  | (8.8) |  |  | (8.4) |  |  | (8.5) |  |  | (0.3) |  |  | (0.4) |  |  | (0.5) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Actuarial Loss (Gain) | 14.9 |  |  | 14.6 |  |  | 15.2 |  |  | 2.9 |  |  | 2.9 |  |  | 2.5 |  |  | (1.2) |  |  | (1.1) |  |  | (10.5) |
Prior Service Cost (Credit) | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.3) |  |  | (0.2) |  |  | (0.2) |
Settlement Loss | 103.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Net Periodic Benefit Cost (Credit) | $ | 126.4 |  |  | $ | 15.5 |  |  | $ | 20.3 |  |  | $ | 2.7 |  |  | $ | 2.1 |  |  | $ | 1.7 |  |  | $ | 2.2 |  |  | $ | 2.3 |  |  | $ | (6.7) |
Schedule of Expected Benefit Payments | The following table provides expected benefit payments, which reflect expected future service, as appropriate.
| U.S. Plans |  | U.K. Plan |  | OPEB
| (in millions of dollars)
Year | Pension Benefits |  | Gross |  | Subsidy Payments |  | Net
2026 | $ | 59.0 |  |  | $ | 6.0 |  |  | $ | 8.4 |  |  | $ | — |  |  | $ | 8.4 |
2027 | 63.1 |  |  | 6.1 |  |  | 8.0 |  |  | — |  |  | 8.0 |
2028 | 66.4 |  |  | 6.3 |  |  | 7.6 |  |  | — |  |  | 7.6 |
2029 | 69.3 |  |  | 6.4 |  |  | 7.3 |  |  | — |  |  | 7.3 |
2030 | 72.1 |  |  | 6.5 |  |  | 6.9 |  |  | — |  |  | 6.9 |
2031-2035 | 402.9 |  |  | 35.0 |  |  | 28.7 |  |  | 0.1 |  |  | 28.6 |

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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (a) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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