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Postretirement Benefits - Schedule of Pension Assets by Component at Fair Value (Details) - Pension Plan - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 677,797 | $ 614,845
Percentage of plan assets | 100.00% | 100.00%
Investment funds, percentage ownership by pension plan | 1.00% | 1.00%
Exchange traded fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, within plan asset category | $ 54,705 | $ 35,483
Percentage of total plan assets, within plan asset category | 8.00% | 6.00%
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 | $ 345,494 | $ 322,846
Percentage of total plan assets, within plan asset category | 51.00% | 53.00%
U.S. Government and Agency |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, within plan asset category | $ 185,818 | $ 179,418
Percentage of total plan assets, within plan asset category | 27.00% | 29.00%
Other bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, within plan asset category | $ 3 | $ 4
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 | $ 46,245 | $ 43,893
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 | $ 3,322 | $ 1,235
Percentage of total plan assets, within plan asset category | 1.00% | 0.00%
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, within plan asset category | $ 341 | $ 1,420
Percentage of total plan assets, within plan asset category | 0.00% | 0.00%
Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 635,928 | $ 584,299
Percentage of plan assets | 94.00% | 95.00%
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 403,862 | $ 360,984
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 | 54,705 | 35,483
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 | 345,494 | 322,846
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 | 3,322 | 1,235
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 | 341 | 1,420
Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 232,066 | 223,315
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 | 185,818 | 179,418
Significant Observable Inputs (Level 2) | Other bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, within plan asset category | 3 | 4
Significant Observable Inputs (Level 2) | Guaranteed annuity contract |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, within plan asset category | 46,245 | 43,893
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 | $ 41,869 | $ 30,546
Percentage of plan assets | 6.00% | 5.00%

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