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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 29, 2025
Equity [Abstract] |
Schedule of Total Comprehensive Income (Loss) | The following table summarizes total comprehensive income:
| Three Months Ended |  | Six Months Ended
| June 29, 2025 |  | June 30, 2024 |  | June 29, 2025 |  | June 30, 2024
| (In thousands)
Net income | $ | 61,006 |  |  | $ | 49,034 |  |  | $ | 112,943 |  |  | $ | 86,343 |
Foreign currency translation adjustments, net of tax | (40,107) |  |  | 6,986 |  |  | (77,467) |  |  | 16,208 |
Adjustments to pension and postretirement liability, net of tax | 211 |  |  | (74) |  |  | 421 |  |  | (148) |
Total comprehensive income | 21,110 |  |  | 55,946 |  |  | 35,897 |  |  | 102,403 |
Less: Comprehensive loss attributable to noncontrolling interests | — |  |  | (10) |  |  | — |  |  | (14) |
Comprehensive income attributable to Belden | $ | 21,110 |  |  | $ | 55,956 |  |  | $ | 35,897 |  |  | $ | 102,417 |
Schedule of Components of Other Comprehensive Income (Loss), Net of Tax | The accumulated balances related to each component of other comprehensive loss, net of tax, are as follows:
| Foreign Currency Translation Component |  | Pension and Other Postretirement Benefit Plans |  | Accumulated Other Comprehensive Loss
| (In thousands)
Balance at December 31, 2024 | $ | 3,129 |  |  | $ | (6,661) |  |  | $ | (3,532) |
Other comprehensive loss attributable to Belden before reclassifications | (77,467) |  |  | — |  |  | (77,467) |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 421 |  |  | 421 |
Net current period other comprehensive loss attributable to Belden | (77,467) |  |  | 421 |  |  | (77,046) |
Balance at June 29, 2025 | $ | (74,338) |  |  | $ | (6,240) |  |  | $ | (80,578) |
Schedule of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) | The following table summarizes the effects of reclassifications from accumulated other comprehensive loss for the six months ended June 29, 2025:
| Amounts Reclassified from Accumulated Other Comprehensive Loss |  | Affected Line Item in the Consolidated Statements of Operations and Comprehensive Income
| (In thousands) |  |
Amortization of pension and other postretirement benefit plan items: |  |  |
Actuarial losses | $ | 474 |  |  | (1)
Prior service cost | 76 |  |  | (1)
Total before tax | 550 |  |  |
Tax benefit | (129) |  |  |
Total net of tax | $ | 421 |  |  |
(1) The amortization of these accumulated other comprehensive loss components are included in the computation of net periodic benefit costs (see Note 13).

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-1 + Details
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