Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Schedule of Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, including NCI		$ 1,166,302	$ 1,143,950
Other comprehensive income (loss), net of tax	$ (93,672)	37,746	(35,404)
Ending balance, including NCI			1,166,302
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,294,736
Other comprehensive income (loss) attributable to Belden before reclassifications	(94,991)
Amounts reclassified from accumulated other comprehensive income	1,319
Net current period other comprehensive income (loss) attributable to Belden	(93,672)
Ending balance	1,264,424	1,294,736
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, including NCI		(41,279)	(5,871)
Other comprehensive income attributable to Belden before reclassifications		38,007
Amounts reclassified from accumulated other comprehensive income		(260)
Other comprehensive income (loss), net of tax		37,747	(35,408)
Ending balance, including NCI			(41,279)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,532)
Net current period other comprehensive income (loss) attributable to Belden	(93,672)
Ending balance	(97,204)	(3,532)
Foreign Currency Translation Component
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, including NCI		(26,514)
Other comprehensive income attributable to Belden before reclassifications		29,643
Amounts reclassified from accumulated other comprehensive income		0
Other comprehensive income (loss), net of tax		29,643
Ending balance, including NCI			(26,514)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	3,129
Other comprehensive income (loss) attributable to Belden before reclassifications	(94,937)
Amounts reclassified from accumulated other comprehensive income	0
Ending balance	(91,808)	3,129
Pension and Other Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, including NCI		(14,765)
Other comprehensive income attributable to Belden before reclassifications		8,364
Amounts reclassified from accumulated other comprehensive income		(260)
Other comprehensive income (loss), net of tax		8,104
Ending balance, including NCI			$ (14,765)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,661)
Other comprehensive income (loss) attributable to Belden before reclassifications	(54)
Amounts reclassified from accumulated other comprehensive income	1,319
Net current period other comprehensive income (loss) attributable to Belden	1,265
Ending balance	$ (5,396)	$ (6,661)

BELDEN INC. 10-K