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v3.25.4

Pension Plans (Fair Value of Plan Assets and Funded Status of Plans) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Type [Extensible List] | us-gaap:PensionPlansDefinedBenefitMember | us-gaap:PensionPlansDefinedBenefitMember | us-gaap:PensionPlansDefinedBenefitMember |
Defined Benefit Plan, Sponsor Location [Extensible List] | us-gaap:DomesticPlanMember | us-gaap:DomesticPlanMember | us-gaap:DomesticPlanMember | us-gaap:DomesticPlanMember
Interest cost | $ 20.5 | $ 20.4 | $ 21.9 |
Qualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Type [Extensible List] | us-gaap:PensionPlansDefinedBenefitMember | us-gaap:PensionPlansDefinedBenefitMember | us-gaap:PensionPlansDefinedBenefitMember |
Defined Benefit Plan, Sponsor Location [Extensible List] | us-gaap:DomesticPlanMember | us-gaap:DomesticPlanMember | us-gaap:DomesticPlanMember |
Benefit obligation, beginning of period | $ 331.5 | $ 348.4 |  |
Interest cost | $ 19.2 | $ 19.1 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Cost and Expense, Operating | Other Cost and Expense, Operating |  |
Actuarial (gains) losses | $ 7.4 | $ (3.8) |  |
Benefits paid | (31.7) | (32.2) |  |
Benefit obligation, end of year | 326.4 | 331.5 | $ 348.4 |
Balance at beginning of period | 340.4 | 363.0 |  |
Actual return on plan assets | 22.0 | 9.6 |  |
Benefits paid | (31.7) | (32.2) |  |
Balance at end of year | 330.7 | 340.4 | $ 363.0 |
Funded status of the plans | $ 4.3 | $ 8.9 |  |
Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Type [Extensible List] | us-gaap:PensionPlansDefinedBenefitMember | us-gaap:PensionPlansDefinedBenefitMember | us-gaap:PensionPlansDefinedBenefitMember |
Defined Benefit Plan, Sponsor Location [Extensible List] | us-gaap:DomesticPlanMember | us-gaap:DomesticPlanMember | us-gaap:DomesticPlanMember |
Benefit obligation, beginning of period | $ 21.3 | $ 22.6 |  |
Interest cost | $ 1.3 | $ 1.3 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Cost and Expense, Operating | Other Cost and Expense, Operating |  |
Actuarial (gains) losses | $ 1.1 | $ 0.2 |  |
Benefits paid | (2.7) | (2.8) |  |
Benefit obligation, end of year | 21.0 | 21.3 | $ 22.6 |
Contributions | 2.7 | 2.8 |  |
Benefits paid | (2.7) | (2.8) |  |
Funded status of the plans | $ (21.0) | $ (21.3) |  |

X
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Indicates type of defined benefit plan. 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