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Segment Reporting
 6 Months Ended
Jun. 30, 2020
Segment Reporting [Abstract]  
Segment Reporting Disclosure
14. BUSINESS SEGMENTS
Prior to the completion of its merger with Anixter on June 22, 2020, as described in Note 4, WESCO had four operating segments that had been aggregated as one reportable segment. Effective on the date of acquisition, the Company added Anixter as a separate reportable segment. This is consistent with the manner in which WESCO's chief operating decision maker ("CODM") reviewed financial information during such period. In the third quarter, the Company intends to identify new operating segments that will be organized around three strategic business units. In connection with this change, the Company will consider performance measures that the CODM will review to assess each strategic business unit.
For the three and six months ended June 30, 2020 and June 30, 2019, the Company's CODM evaluated the performance of its operating segments based primarily on net sales, income from operations, and total assets. The results of operations of Anixter reflect the period from the acquisition date to June 30, 2020.