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%