Net Investment Hedge	9 Months Ended
	Sep. 29, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net Investment Hedge	Net Investment HedgeAll of our euro denominated notes were issued by Belden Inc., a USD functional currency entity. As of September 29, 2019, all of our outstanding foreign denominated debt is designated as a net investment hedge on the foreign currency risk of our net investment in our euro foreign operations. The objective of the hedge is to protect the net investment in the foreign operation against adverse changes in the euro exchange rate. The transaction gain or loss is reported in the translation adjustment section of other comprehensive income. For the nine months ended September 29, 2019 and September 30, 2018, the transaction gain associated with these notes that was reported in other comprehensive income was $62.1 million and $46.3 million, respectively.