Net Investment Hedge	6 Months Ended
	Jun. 28, 2020
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 June 28, 2020, €767.8 million 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 six months ended June 28, 2020 and June 30, 2019, the transaction gain associated with the net investment hedge reported in other comprehensive income was $18.2 million and $6.9 million, respectively.