v3.26.1
Postretirement Benefits - Schedule of Pension Assets by Component at Fair Value (Details) - Pension Plan
$ in Thousands
Mar. 31, 2026
USD ($)
fund
Dec. 31, 2025
USD ($)
fund
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 660,081 $ 684,279
Percentage of plan assets 100.00% 100.00%
Investment funds, percentage ownership by pension plan 1.00% 1.00%
Number of long-term investment funds | fund 3 2
Exchange traded fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category $ 52,641 $ 53,437
Percentage of total plan assets, within plan asset category 8.00% 8.00%
Investment grade securities issued term 10 years 10 years
Equity exchange traded fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category $ 328,164 $ 344,409
Percentage of total plan assets, within plan asset category 50.00% 50.00%
U.S. Government and Agency    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category $ 180,553 $ 180,974
Percentage of total plan assets, within plan asset category 27.00% 26.00%
Other bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category $ 3 $ 3
Percentage of total plan assets, within plan asset category 0.00% 0.00%
Guaranteed annuity contract    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category $ 46,454 $ 46,341
Percentage of total plan assets, within plan asset category 7.00% 7.00%
Short-term investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category $ 2,620 $ 6,957
Percentage of total plan assets, within plan asset category 0.00% 1.00%
Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category $ 1,127 $ 3,747
Percentage of total plan assets, within plan asset category 0.00% 1.00%
Fair Value, Inputs, Level 1, 2 and 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 611,562 $ 635,868
Percentage of plan assets 92.00% 93.00%
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 384,552 $ 408,550
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 52,641 53,437
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity exchange traded fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 328,164 344,409
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government and Agency    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Guaranteed annuity contract    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 2,620 6,957
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 1,127 3,747
Significant Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 227,010 227,318
Significant Observable Inputs (Level 2) | Exchange traded fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Observable Inputs (Level 2) | Equity exchange traded fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Observable Inputs (Level 2) | U.S. Government and Agency    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 180,553 180,974
Significant Observable Inputs (Level 2) | Other bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 3 3
Significant Observable Inputs (Level 2) | Guaranteed annuity contract    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 46,454 46,341
Significant Observable Inputs (Level 2) | Short-term investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Observable Inputs (Level 2) | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Unobservable Inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Significant Unobservable Inputs (Level 3) | Exchange traded fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Unobservable Inputs (Level 3) | Equity exchange traded fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Unobservable Inputs (Level 3) | U.S. Government and Agency    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Unobservable Inputs (Level 3) | Other bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Unobservable Inputs (Level 3) | Guaranteed annuity contract    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Unobservable Inputs (Level 3) | Short-term investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Significant Unobservable Inputs (Level 3) | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, within plan asset category 0 0
Fair Value Measured at Net Asset Value Per Share    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 48,519 $ 48,411
Percentage of plan assets 8.00% 7.00%