Intangible Assets - Additional Information (Details)	12 Months Ended
Intangible Assets - Additional Information (Details)	Dec. 31, 2025 USD ($) reportingUnit	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Number of reporting units used in qualitative assessment \| reportingUnit	5
Impairment		$ 0	$ 0
Reporting unit, percentage of fair value in excess of carrying amount	15.00%
Amortization expense in income from continuing operations	$ 65,600,000	59,400,000	48,100,000
Expected annual amortization expense in 2026	60,200,000
Expected annual amortization expense in 2027	56,700,000
Expected annual amortization expense in 2028	50,700,000
Expected annual amortization expense in 2029	37,900,000
Expected annual amortization expense in 2030	$ 30,100,000
Customer relationships
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Amortization Period	19 years 3 months 18 days
Developed technology
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Amortization Period	7 years 2 months 12 days
Trademarks
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Amortization Period	6 years 9 months 18 days
Non-compete agreements
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Amortization Period	5 years
Backlog
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Amortization Period	5 years
Measurement Input, Discount Rate
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Goodwill, measurement input	13.60%
Measurement Input, Long-Term Revenue Growth Rate \| Revenue Growth Rate, Tranche One
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Goodwill, measurement input	5.90%
Measurement Input, Long-Term Revenue Growth Rate \| Revenue Growth Rate, Tranche Two
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Goodwill, measurement input	3.00%
Continuing Operations
Finite And Indefinite Lived Intangible And Other Asset [Line Items]
Impairment	$ 0	$ 0	$ 0

BELDEN INC. 10-K