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Retirement Benefit Plans - Summary of Components of Accumulated Other Comprehensive Loss Related to Pensions and Postretirement Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain) | $ 34,440 | $ 41,296
Deferred tax (benefit) expense | (6,488) | (11,201)
Net amount recorded in (AOCL) | 27,952 | 30,095
SERP |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain) | (44) | 312
Deferred tax (benefit) expense | 8 | (85)
Net amount recorded in (AOCL) | (36) | 227
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain) | (1,788) | (3,231)
Deferred tax (benefit) expense | 337 | 876
Net amount recorded in (AOCL) | $ (1,451) | $ (2,355)

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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