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Compensation Related Costs, Postemployment Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Postemployment Benefits, Period Expense | $ 16,400 | $ 3,500 | $ 49,100 | $ 12,600 |
Service cost | 4,015 | 3,826 | 12,082 | 6,801 |
Interest cost | 4,483 | 4,844 | 13,520 | 7,170 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 8,691 | 8,399 | 26,139 | 12,001 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (103) | 1 | (311) | (52) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  | 19 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (90) | 270 | (245) | 2,022 |
Increase (Decrease) in Other Operating Assets |  |  | (19,299) | 26,655 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Postemployment Benefits, Period Expense | 16,400 | 3,500 | 49,100 | 12,600 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 2,400 | 2,200 | 8,100 | 4,000 |
Increase (Decrease) in Other Operating Assets |  |  | (19,299) | 26,655 |
UNITED STATES |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 764 | 824 | 2,291 | 944 |
Interest cost | 2,018 | 2,299 | 6,095 | 2,565 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 4,414 | 4,041 | 13,241 | 4,498 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 0 | 0 | 0 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  | 19 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (1,632) | (918) | (4,874) | (989) |
Foreign Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 3,251 | 3,002 | 9,791 | 5,857 |
Interest cost | 2,465 | 2,545 | 7,425 | 4,605 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 4,277 | 4,358 | 12,898 | 7,503 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (103) | 1 | (311) | (52) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  | 0 | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 1,542 | 1,188 | 4,629 | 3,011 |
WESCO |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Deferred Compensation Liability, Classified, Noncurrent |  |  |  |  | $ 17,300
WESCODeferredCompensationPlanMember |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Deferred Compensation Liability, Current and Noncurrent |  |  |  |  | 27,400
Deferred Compensation Liability, Current and Noncurrent |  |  |  |  | 27,400
Pension Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year One | 18,100 |  | 18,100 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year One | 18,100 |  | 18,100 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 10,400 |  |
Other Nonoperating Gains (Losses) | (4,100) | (3,600) | $ (12,300) | (4,800) |
Canadian 401K Defined Contribution Plan [Member] | Minimum [Member] |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined Contribution Plan Employer Matching Contribution Percent |  |  | 3.00% |  |
Canadian 401K Defined Contribution Plan [Member] | Maximum [Member] |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined Contribution Plan Employer Matching Contribution Percent |  |  | 5.00% |  |
US 401K Defined Contribution Plan [Member] |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  | 50.00% |  |
Defined Contribution Plan Employer Matching Contribution Percent |  |  | 6.00% |  |
Anixter Employee Savings Plan [Member] |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  | 5.00% |  |
Anixter Employee Savings Plan [Member] | Minimum [Member] |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined Contribution Plan Employer Matching Contribution Percent |  |  | 2.00% |  |
Anixter Employee Savings Plan [Member] | Maximum [Member] |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined Contribution Plan Employer Matching Contribution Percent |  |  | 2.50% |  |
WESCODeferredCompensationPlanMember |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Deferred Compensation Liability, Current |  |  |  |  | 10,100
Deferred Compensation Liability, Classified, Noncurrent | 19,900 |  | $ 19,900 |  |
Anixter Deferred Compensation Plan Member |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Assets Held-in-trust |  |  |  |  | 39,600
Deferred Compensation Liability, Current |  |  |  |  | 45,100
Increase (Decrease) in Other Operating Assets |  |  | 39,700 |  |
Deferred Compensation Arrangement with Individual, Distribution Paid |  |  | 42,800 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Distribution Paid |  |  | 42,800 |  |
Increase (Decrease) in Other Operating Assets |  |  | $ 39,700 |  |
Phantom Share Units (PSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |
Share-based Payment Arrangement, Expense | 3,400 | $ 1,400 | $ 9,800 | $ 2,300 |
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent | $ 20,500 |  | $ 20,500 |  | $ 22,800

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