WESCO International (WCC) 10-Q 5 May 23 2023 Q1 Quarterly report Financial data

COVER PAGE

COVER PAGE - shares	3 Months Ended
	Mar. 31, 2023	May 04, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	001-14989
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	25-1723342
Entity Address, Address Line One	225 West Station Square DriveSuite 700
Entity Address, City or Town	Pittsburgh,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15219
City Area Code	412
Local Phone Number	454-2200
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Registrant Name	WESCO International, Inc.
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Central Index Key	0000929008
Entity Common Stock, Shares Outstanding		51,272,245
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		51,272,245
Common Class A [Member]
Cover [Abstract]
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	WCC
Security Exchange Name	NYSE
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	WCC
Security Exchange Name	NYSE
Series A Preferred Stock [Member]
Cover [Abstract]
Title of 12(b) Security	Depositary Shares, each representing a 1/1,000th interest in a share of Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock
Trading Symbol	WCC PR A
Security Exchange Name	NYSE
Entity Listings [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/1,000th interest in a share of Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock
Trading Symbol	WCC PR A
Security Exchange Name	NYSE

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 349.1	$ 527.3
Accounts Receivable, after Allowance for Credit Loss, Current	3,807.4	3,662.7
Accounts and Other Receivables, Net, Current	344.3	435.7
Inventories, net	3,729.5	3,498.8
Prepaid expenses and other current assets	217.8	206
Assets, Current	8,448.1	8,330.5
Property, buildings and equipment, net of accumulated depreciation of $229,041 and $213,758 in 2014 and 2013, respectively	402.1	402.7
Operating Lease, Right-of-Use Asset	660.1	625.1
Intangible assets, net	1,921.5	1,943.4
Goodwill	3,244.8	3,240.9
Other assets	294.6	269.1
Assets	14,971.2	14,811.7
Accounts payable	2,648.3	2,728.2
Accrued payroll and benefit costs	121.6	269.1
Current portion of long-term debt	7.6	70.5
Other Liabilities, Current	761.4	749.5
Liabilities, Current	3,538.9	3,817.3
Total long-term debt	5,595.1	5,346
Operating Lease, Liability, Noncurrent	540.5	510.4
Deferred Income Tax Liabilities, Net	472.1	460.7
Other Liabilities, Noncurrent	234.9	227.7
Liabilities	10,381.5	10,362.1
Commitments and Contingencies
Additional capital	2,003.3	2,005.4
Retained earnings	$ 3,933	$ 3,795
Treasury Stock, Common, Shares	22,195,470	22,115,653
Treasury stock, at cost; 22,195,470 and 22,115,653 shares in 2023 and 2022, respectively	$ (982)	$ (969.1)
Accumulated other comprehensive income	(360.7)	(377.7)
Total WESCO International, Inc. stockholders' equity	4,594.3	4,454.3
Noncontrolling interest	(4.6)	(4.7)
Total stockholders’ equity	4,589.7	4,449.6
Liabilities and Equity	$ 14,971.2	$ 14,811.7
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Series A Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (in shares)	25,000
Preferred stock, shares outstanding (in shares)	21,612
Preferred stock, shares issued (in shares)	21,612	21,612
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	210,000,000	210,000,000
Common stock, shares, issued (in shares)	69,110,060	68,535,704
Common stock, shares outstanding (in shares)	51,254,021	50,759,482
Common stock	$ 0.7	$ 0.7
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares, issued (in shares)	4,339,431	4,339,431
Common stock, shares outstanding (in shares)	0	0
Common stock	$ 0	$ 0

CONSOLIDATED BALANCE SHEETS (pa

CONSOLIDATED BALANCE SHEETS (parenthetical items) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss, Current	$ 52.5	$ 46.5
Accumulated depreciation	452.9	425.8
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 54.2	$ 57.9

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Gross Profit [Abstract]
Revenues	$ 5,521.9	$ 4,932.2
Cost of goods sold	4,313.4	3,883.1
Operating Expenses [Abstract]
Selling, general and administrative expense	817.7	718.1
Depreciation and amortization	44.4	47
Income from operations	346.4	284
Interest expense, net	95	63.6
Other expense, net	10.1	1.1
Income before income taxes	241.3	219.3
Provision for income taxes	44.1	37.7
Net income	197.2	181.6
Net (loss) income attributable to noncontrolling interest	0.1	0.4
Net income attributable to WESCO International, Inc.	197.1	181.2
Preferred Stock Dividends, Income Statement Impact	14.4	14.4
Net Income (Loss) Available to Common Stockholders, Basic	182.7	166.8
Comprehensive Income:
Foreign currency translation adjustment	17	31.6
Comprehensive income attributable to WESCO International, Inc.	$ 199.7	$ 198.4
Basic (in dollars per share)	$ 3.58	$ 3.30
Diluted (in dollars per share)	$ 3.48	$ 3.19

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net income	$ 197.2	$ 181.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44.4	47
Stock-based compensation expense	11.7	8.9
Amortization of Debt Issuance Costs and Discounts	3.6	4.6
Deferred income taxes	11.6	(4.5)
Other operating activities, net	0.3	1.5
Changes in assets and liabilities
Increase (Decrease) in Accounts Receivable	133.5	324.6
Increase (Decrease) in Accounts and Other Receivables	91.5	17.8
Inventories, net	(223.8)	(214.2)
Increase (Decrease) in Other Operating Assets	(25.2)	(34.2)
Accounts payable	(86.5)	200
Accrued payroll and benefit costs	(149.6)	(135.9)
Other current and noncurrent liabilities	2.9	80
Net cash provided by operating activities	(255.4)	(172)
Investing Activities:
Capital expenditures	(13.9)	(15.2)
Other investing activities	1.3	0.1
Net cash used in investing activities	(12.6)	(15.1)
Financing Activities:
Proceeds from (Repayments of) Short-term Debt	(4.8)	1.5
Repayments of Senior Debt	58.6	0
Proceeds from issuance of long-term debt	968.3	982.3
Repayments of Other Long-term Debt	723.9	792.5
Payments for Repurchase of Common Stock	(51.6)	(16.8)
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	14.4	14.4
Payments of Ordinary Dividends, Common Stock	(19.2)	0
Other financing activities, net	(7.2)	7.1
Net cash used in financing activities	88.6	167.2
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations	1.2	8.8
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(178.2)	(11.1)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	349.1	201.5
Supplemental Cash Flow Information [Abstract]
Interest Paid, Excluding Capitalized Interest, Operating Activities	37.6	8.9
Income Taxes Paid	36.4	27.8
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 59.9	$ 79.1

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Millions	Total	Common Class B [Member]	Common Stock [Member]	Series A Preferred Stock [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Retained Earnings [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]
Common stock		$ 0	$ 0.7
Common Stock, Shares, Issued		4,339,431	68,162,297
Additional capital	$ 1,969.3
Retained Earnings (Accumulated Deficit)	3,004.7
Treasury Stock, Value	(956.2)
Stockholders' Equity Attributable to Noncontrolling Interest	(6.3)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (236)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Treasury Stock, Common, Shares	22,026,922
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 0						$ (0.6)
APIC, Share-based Payment Arrangement, Recognition and Exercise	$ 0
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	8.9
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 0				$ 8.1	$ 7.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			365,833						858
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(129,869)
Net Income (Loss) Attributable to Parent	181.2
Dividends, Preferred Stock	(14.4)
Net Income (Loss) Attributable to Noncontrolling Interest	0.4					$ 0.4
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax					$ 31.6
Common stock		$ 0	$ 0.7
Common Stock, Shares, Issued		4,339,431	68,398,261
Additional capital	1,970.4
Retained Earnings (Accumulated Deficit)	3,163.4
Treasury Stock, Value	(956.8)
Stockholders' Equity Attributable to Noncontrolling Interest	(5.9)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (204.4)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Treasury Stock, Common, Shares	22,027,780
Common stock		$ 0	$ 0.7
Common Stock, Shares, Issued		4,339,431	68,535,704
Additional capital	$ 2,005.4
Retained Earnings (Accumulated Deficit)	3,795
Treasury Stock, Value	(969.1)
Stockholders' Equity Attributable to Noncontrolling Interest	(4.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (377.7)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Treasury Stock, Common, Shares	22,115,653
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 0						$ (12.9)
APIC, Share-based Payment Arrangement, Recognition and Exercise	$ 0.3
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	11.7
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 0				24.5	14.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			811,309						79,817
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(236,953)
Net Income (Loss) Attributable to Parent	197.1
Dividends, Preferred Stock	(14.4)
Stockholders' Equity, Other							$ (1)	$ 0.1
Net Income (Loss) Attributable to Noncontrolling Interest	0.1					$ 0.1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax					$ 17
Dividends, Common Stock	(19.2)
Common stock		$ 0	$ 0.7
Common Stock, Shares, Issued		4,339,431	69,110,060
Additional capital	2,003.3
Retained Earnings (Accumulated Deficit)	3,933
Treasury Stock, Value	(982)
Stockholders' Equity Attributable to Noncontrolling Interest	(4.6)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (360.7)
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding				$ 0
Preferred stock, shares issued (in shares)				21,612
Treasury Stock, Common, Shares	22,195,470

ORGANIZATION

ORGANIZATION	3 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION	WESCO International, Inc. (“Wesco International”) and its subsidiaries (collectively, “Wesco” or the “Company”), headquartered in Pittsburgh, Pennsylvania, is a leading provider of business-to-business distribution, logistics services and supply chain solutions.

ACCOUNTING POLICIES

ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
ACCOUNTING POLICIES	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of Wesco have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). The unaudited condensed consolidated financial information should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in WESCO International, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2022, as filed with the SEC on February 21, 2023. The Condensed Consolidated Balance Sheet at December 31, 2022 was derived from the audited Consolidated Financial Statements as of that date, but does not include all the disclosures required by accounting principles generally accepted in the United States of America. The unaudited Condensed Consolidated Balance Sheet as of March 31, 2023, the unaudited Condensed Consolidated Statements of Income and Comprehensive Income, the unaudited Condensed Consolidated Statements of Stockholders' Equity, and the unaudited Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2023, and 2022, respectively, in the opinion of management, have been prepared on the same basis as the audited Consolidated Financial Statements and include all adjustments necessary for the fair statement of the results of the interim periods presented herein. All adjustments reflected in the unaudited condensed consolidated financial information are of a normal recurring nature unless indicated. The results for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year. Recently Adopted and Recently Issued Accounting Standards In September 2022, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2022-04, Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations , which requires that a buyer in a supplier finance program disclose sufficient information about the program to allow a user of financial statements to understand the program's nature, activity during the period, changes from period to period, and potential magnitude. The amendments in this ASU are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. The Company adopted this ASU in the first quarter of 2023, except for the amendment on rollforward information, which the Company will begin disclosing in its Annual Report on Form 10-K for the fiscal year ending December 31, 2023. The adoption of this ASU resulted in additional disclosure of the Company's supplier finance program, as described below. Other pronouncements issued by the FASB or other authoritative accounting standards groups with future effective dates are either not applicable or are not expected to be significant to Wesco’s financial position, results of operations or cash flows.
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recently Adopted and Recently Issued Accounting Standards
Supplier Finance Program	Supplier Finance Programs The Company has a supplier finance program that is administered by an intermediary. Under this arrangement, participating suppliers may elect to receive early payment of invoices that have been confirmed by the Company, less an interest deduction, which is paid to the supplier by a third-party finance provider. Wesco agrees to pay the stated amount of confirmed invoices in full on the original due date of the invoices, which is typically within 45 to 90 days of the invoice date, regardless of whether the supplier elects to receive early payment from the third-party finance provider. The Company does not provide assets pledged as security or other forms of guarantees to the finance provider or intermediary under this arrangement. As of March 31, 2023 and December 31, 2022, the amounts due to suppliers that participate in the Company's supplier finance program were approximately $30.0 million and $30.7 million, respectively, which are included in accounts payable in the Condensed Consolidated Balance Sheet.

REVENUE (Notes)

REVENUE (Notes)	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	3. REVENUE Wesco distributes products and provides services to customers globally in various end markets within its business segments. The segments operate in the United States, Canada and various other countries. The following tables disaggregate Wesco’s net sales by segment and geography for the periods presented: Three Months Ended March 31 (In millions) 2023 2022 Electrical & Electronic Solutions $ 2,135.1 $ 2,090.0 Communications & Security Solutions 1,732.0 1,434.2 Utility & Broadband Solutions 1,654.8 1,408.0 Total by segment $ 5,521.9 $ 4,932.2 Three Months Ended March 31 (In millions) 2023 2022 United States $ 4,090.5 $ 3,654.4 Canada 759.4 715.0 Other International (1) 672.0 562.8 Total by geography (2) $ 5,521.9 $ 4,932.2 (1) No individual country's net sales are greater than 10% of total net sales. (2) Wesco attributes revenues from external customers to individual countries on the basis of point of sale. Due to the terms of certain contractual arrangements, Wesco bills or receives payment from its customers in advance of satisfying the respective performance obligation. Such advance billings or payments are recorded as deferred revenue and recognized as revenue when the performance obligation has been satisfied and control has transferred to the customer, which is generally upon shipment. Deferred revenue is usually recognized within a year or less from the date of the advance billing or payment. At March 31, 2023 and December 31, 2022, $112.2 million and $99.6 million, respectively, of deferred revenue was recorded as a component of other current liabilities in the Condensed Consolidated Balance Sheets. The Company recognized $21.0 million of revenue during the three months ended March 31, 2023 that was included in the deferred revenue balance as of December 31, 2022. The amount of revenue recognized during the three months ended March 31, 2022 that was deferred as of December 31, 2021 was not material. The Company also has certain long-term contractual arrangements where revenue is recognized over time based on the cost-to-cost input method. As of March 31, 2023 and December 31, 2022, the Company had contract assets of $34.8 million and $27.5 million, respectively, resulting from contracts where the amount of revenue recognized exceeded the amount billed to the customer. Contract assets are recorded in the Condensed Consolidated Balance Sheets as a component of prepaid expenses and other current assets. Wesco’s revenues are adjusted for variable consideration, which includes customer volume rebates, returns and discounts. Wesco measures variable consideration by estimating expected outcomes using analysis and inputs based upon historical data, as well as current and forecasted information. Variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended March 31, 2023 and 2022 by approximately $96.5 million and $95.1 million, respectively. The variable consideration for the three months ended March 31, 2022 reflects an adjustment that reduced the previously disclosed amount by $20.1 million. As of March 31, 2023 and December 31, 2022, the Company's estimated product return obligation was $43.9 million and $46.5 million, respectively.

GOODWILL (Notes)

GOODWILL (Notes)	3 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure	The following table sets forth the changes in the carrying value of goodwill by reportable segment for the period presented: Three Months Ended March 31, 2023 EES CSS UBS Total (In millions) Beginning balance, January 1 $ 825.5 $ 1,208.9 $ 1,206.5 $ 3,240.9 Foreign currency exchange rate changes 1.3 (0.7) 0.7 1.3 Adjustments to goodwill for acquisitions (1) — 2.6 — 2.6 Ending balance, March 31 $ 826.8 $ 1,210.8 $ 1,207.2 $ 3,244.8 (1) Reflects the effect on goodwill of adjustments to the assets acquired and liabilities assumed in the acquisition of Rahi Systems since their initial measurement, which is part of the CSS segment, as described in Note 4, "Acquisitions". The components of intangible assets are as follows: As of March 31, 2023 December 31, 2022 Life (in years) Gross Carrying Amount (1) Accumulated Amortization (1) Net Carrying Amount Gross Carrying Amount (1) Accumulated Amortization (1) Net Carrying Amount Intangible assets: (In millions) Trademarks Indefinite $ 792.2 $ — $ 792.2 $ 792.1 $ — $ 792.1 Customer relationships 10 - 20 1,516.6 (399.3) 1,117.3 1,516.0 (377.6) 1,138.4 Distribution agreements 15 - 19 29.2 (24.8) 4.4 29.2 (24.4) 4.8 Trademarks 5 and 12 15.5 (7.9) 7.6 15.5 (7.4) 8.1 $ 2,353.5 $ (432.0) $ 1,921.5 $ 2,352.8 $ (409.4) $ 1,943.4 (1) Excludes the original cost and related accumulated amortization of fully-amortized intangible assets. Amortization expense related to intangible assets totaled $22.0 million and $25.7 million for the three months ended March 31, 2023 and 2022, respectively. The following table sets forth the remaining estimated amortization expense for intangible assets for the next five years and thereafter: For the year ending December 31, (In millions) 2023 $ 66.6 2024 86.1 2025 83.0 2026 77.7 2027 74.8 Thereafter 741.1

STOCK-BASED COMPENSATION (Notes

STOCK-BASED COMPENSATION (Notes)	3 Months Ended
	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION	Wesco’s stock-based compensation awards consist of stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled stock appreciation rights is determined using the Black-Scholes model. The fair value of restricted stock units and performance-based awards with performance conditions is determined by the grant-date closing price of Wesco’s common stock. The forfeiture assumption is based on Wesco’s historical participant behavior that is reviewed on at least an annual basis. For stock options and stock-settled stock appreciation rights that are exercised, and for restricted stock units and performance-based awards that vest, shares are issued out of Wesco's outstanding common stock. Stock options and stock-settled stock appreciation rights vest ratably over a three-year period and terminate on the tenth anniversary of the grant date unless terminated sooner under certain conditions. Restricted stock unit awards that were granted under the Company’s 1999 Long-Term Incentive Plan, as amended and restated, vest fully on the third anniversary of the date of grant. The special award described below vests in tranches. Restricted stock units awarded under the WESCO International, Inc. 2021 Omnibus Incentive Plan, which was adopted on May 27, 2021, vest ratably over a three-year period on each of the first, second and third anniversaries of the grant date. Vesting of performance-based awards is based on a three-year performance period, and the number of shares earned, if any, depends on the attainment of certain performance levels. Outstanding awards would vest upon the consummation of a change in control transaction with performance-based awards vesting at the target level. On July 2, 2020, a special award of restricted stock units was granted to certain officers of the Company. These awards vested in tranches of 30% on each of the first and second anniversaries of the grant date and will vest 40% on the third anniversary of the grant date, subject to continued employment through the applicable anniversary date. Performance-based awards are based on two equally-weighted performance measures: the three-year average growth rate of Wesco's net income attributable to common stockholders and the three-year cumulative return on net assets. These awards are accounted for as awards with performance conditions; compensation cost is recognized over the performance period based upon Wesco's determination of whether it is probable that the performance targets will be achieved. During the three months ended March 31, 2023 and 2022, Wesco granted the following stock options, restricted stock units, and performance-based awards at the following weighted-average fair values: Three Months Ended March 31, March 31, Stock options granted 75,182 89,550 Weighted-average fair value $ 76.77 $ 57.26 Restricted stock units granted 170,569 224,946 Weighted-average fair value $ 171.03 $ 122.11 Performance-based awards granted (1) 208,371 83,991 Weighted-average fair value (1) $ 85.94 $ 122.09 (1) As described further below, the three months ended March 31, 2023 includes performance-based awards granted in February 2020 for which actual achievement levels were certified in February 2023. The fair values of stock options, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods: Three Months Ended March 31, March 31, Risk free interest rate 4.1 % 1.9 % Expected life (in years) 5 7 Expected volatility 50 % 43 % Expected dividend yield 0.88 % n/a The risk-free interest rate is based on the U.S. Treasury Daily Yield Curve rate as of the grant date. The expected life is based on historical exercise experience, the expected volatility is based on the volatility of the Company's daily stock price over the expected life preceding the grant date of the award, and the expected dividend yield is based on the calculated yield on the Company's common stock at date of grant using the current fiscal year projected dividend distribution rate. The Company did not pay dividends to holders of its common stock during the three months ended March 31, 2022. The following table sets forth a summary of stock options and related information for the three months ended March 31, 2023: Awards Weighted- Weighted- Aggregate Outstanding at December 31, 2022 87,347 $ 121.55 Granted 75,182 170.04 Exercised (1,279) 122.09 Forfeited — — Outstanding at March 31, 2023 161,250 $ 144.15 9.4 $ 2.9 Exercisable at March 31, 2023 27,329 $ 122.09 8.9 $ 0.9 For the three months ended March 31, 2023, the aggregate intrinsic value of stock options exercised during such period was not material. The following table sets forth a summary of stock-settled stock appreciation rights and related information for the three months ended March 31, 2023: Awards Weighted- Weighted- Aggregate Outstanding at December 31, 2022 1,248,115 $ 62.02 Granted — — Exercised (339,649) 68.51 Forfeited (638) 72.15 Outstanding at March 31, 2023 907,828 $ 59.59 5.6 $ 86.2 Exercisable at March 31, 2023 865,198 $ 58.72 5.5 $ 82.9 For the three months ended March 31, 2023, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $31.6 million. The following table sets forth a summary of restricted stock units and related information for the three months ended March 31, 2023: Awards Weighted- Unvested at December 31, 2022 774,233 $ 73.79 Granted 170,569 171.03 Vested (323,156) 72.05 Forfeited (184) 102.64 Unvested at March 31, 2023 621,462 $ 101.38 The following table sets forth a summary of performance-based awards and related information for the three months ended March 31, 2023: Awards Weighted- Unvested at December 31, 2022 335,329 $ 75.26 Granted (1) 208,371 85.94 Vested (289,394) 48.32 Forfeited — — Unvested at March 31, 2023 254,306 $ 114.66 (1) Includes 63,098 performance-based awards granted in February 2023 with a fair value of $171.96 and three-year performance period ending December 31, 2025, and 144,697 performance-based awards granted in February 2020 with a fair value of $48.32 and three-year performance period ended December 31, 2022 for which actual achievement levels were certified in February 2023. Wesco recognized $11.7 million and $8.9 million of non-cash stock-based compensation expense for the three months ended March 31, 2023 and 2022, respectively, which is included in selling, general and administrative expenses for such periods. As of March 31, 2023, there was $85.2 million of total unrecognized compensation expense related to non-vested stock-based compensation arrangements for all awards previously made of which approximately $35.1 million is expected to be recognized over the remainder of 2023, $31.5 million in 2024, $16.7 million in 2025 and $1.9 million in 2026.

EARNINGS PER SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
EARNINGS PER SHARE	Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the periods. Diluted earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of equity awards. The following table sets forth the computation of basic and diluted earnings per share for the periods presented: Three Months Ended March 31 (In millions, except per share data) 2023 2022 Net income attributable to WESCO International, Inc. $ 197.1 $ 181.2 Less: Preferred stock dividends 14.4 14.4 Net income attributable to common stockholders $ 182.7 $ 166.8 Weighted-average common shares outstanding used in computing basic earnings per share 51.0 50.6 Common shares issuable upon exercise of dilutive equity awards 1.5 1.6 Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share 52.5 52.2 Earnings per share attributable to common stockholders Basic $ 3.58 $ 3.30 Diluted $ 3.48 $ 3.19

DEBT (Notes)

DEBT (Notes)	3 Months Ended
	Mar. 31, 2023
Debt Instrument [Line Items]
Debt Disclosure [Text Block]	8. DEBT The following table sets forth Wesco's outstanding indebtedness: As of March 31, December 31, (In millions) International lines of credit $ 2.2 $ 7.1 Accounts Receivable Securitization Facility 1,613.0 1,535.0 Revolving Credit Facility 1,189.8 1,023.6 5.50% Anixter Senior Notes due 2023 — 58.6 6.00% Anixter Senior Notes due 2025 4.2 4.2 7.125% Senior Notes due 2025 1,500.0 1,500.0 7.250% Senior Notes due 2028, less debt discount of $6.5 and $6.8 in 2023 and 2022, respectively 1,318.5 1,318.2 Finance lease obligations 22.6 20.6 Total debt 5,650.3 5,467.3 Plus: Fair value adjustments to the Anixter Senior Notes 0.1 0.3 Less: Unamortized debt issuance costs (47.7) (51.1) Less: Short-term debt and current portion of long-term debt (1) (7.6) (70.5) Total long-term debt $ 5,595.1 $ 5,346.0 (1) As of December 31, 2022, short-term debt and current portion of long-term debt included the $58.6 million aggregate principal amount of the Company's 5.50% Anixter Senior Notes due 2023, which matured on March 1, 2023. 5.50% Anixter Senior Notes due 2023 On March 1, 2023, Wesco Distribution repaid the $58.6 million aggregate principal amount of its 5.50% Anixter Senior Notes due 2023 plus accrued interest up to, but not including, the maturity date. The repayment was funded with borrowings under the Company's Revolving Credit Facility and had no impact on the Company's results of operations.

EMPLOYEE BENEFIT PLANS (Notes)

EMPLOYEE BENEFIT PLANS (Notes)	3 Months Ended
	Mar. 31, 2023
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	9. EMPLOYEE BENEFIT PLANS The following table sets forth the components of net periodic pension (benefit) cost for the Company's defined benefit plans: Three Months Ended (In millions) March 31, 2023 March 31, 2022 March 31, 2023 March 31, 2022 March 31, 2023 March 31, 2022 Domestic Plans (1) Foreign Plans (2) Total Service cost $ — $ — $ 1.2 $ 2.2 $ 1.2 $ 2.2 Interest cost 2.6 2.1 2.8 2.3 5.4 4.4 Expected return on plan assets (2.4) (3.5) (3.0) (4.3) (5.4) (7.8) Recognized actuarial gain (3) — — (0.3) (0.2) (0.3) (0.2) Net periodic pension (benefit) cost $ 0.2 $ (1.4) $ 0.7 $ — $ 0.9 $ (1.4) (1) Defined as the Anixter Inc. Pension Plan, Anixter Inc. Executive Benefit Plan, and the Anixter Inc. Supplemental Executive Retirement Plan. (2) Defined as the EECOL Electric ULC Retirement Plan, the EECOL Electric ULC Supplemental Executive Retirement Plan, the Pension Plan for Employees of Anixter Canada Inc., and various defined benefit pension plans covering employees of foreign subsidiaries in Europe. (3) For the three months ended March 31, 2023 and 2022, no material amounts were reclassified from accumulated other comprehensive income into net income. Service cost is reported as a component of selling, general and administrative expenses. The other components of net periodic pension (benefit) cost totaling net benefits of $0.3 million and $3.6 million for the three months ended March 31, 2023 and 2022, respectively, are presented as components of other expense (income), net. The Company expects to contribute approximately $7.0 million to its Foreign Plans in 2023, of which approximately $2.4 million was contributed during the three months ended March 31, 2023. The Company does not expect to make a contribution to its domestic qualified pension plan in 2023 due to its overfunded status. Other Employee Benefit Plans Wesco sponsors defined contribution retirement savings plans for the majority of its employees in the U.S. and certain employees in Canada, which provide employer contributions. Wesco incurred charges of $21.4 million and $18.1 million for the three months ended March 31, 2023 and 2022, respectively, for its defined contribution plans. Wesco Distribution sponsors a non-qualified deferred compensation plan (the “Wesco Deferred Compensation Plan”) that permits select employees to make pre-tax deferrals of salary and bonus. Employees have the option to transfer balances allocated to their accounts in the Wesco Deferred Compensation Plan into any of the available investment options. The Wesco Deferred Compensation Plan is an unfunded plan. As of March 31, 2023 and December 31, 2022, the Company's obligation under the Wesco Deferred Compensation Plan was $24.7 million and $20.3 million, respectively, which is included in other noncurrent liabilities in the Condensed Consolidated Balance Sheets.
Compensation Related Costs, General	Other Employee Benefit Plans Wesco sponsors defined contribution retirement savings plans for the majority of its employees in the U.S. and certain employees in Canada, which provide employer contributions.

FAIR VALUE (Notes)

FAIR VALUE (Notes)	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	10. FAIR VALUE OF FINANCIAL INSTRUMENTS The Company’s financial instruments primarily consist of cash and cash equivalents, accounts receivable, accounts payable, bank overdrafts, outstanding indebtedness, foreign currency forward contracts, and benefit plan assets. Except for benefit plan assets, outstanding indebtedness and foreign currency forward contracts, the carrying value of the Company’s other financial instruments approximates fair value. The assets of the Company's various defined benefit plans are primarily comprised of common/collective/pool funds (i.e., mutual funds). These funds are valued at the net asset value (NAV) of shares held in the underlying funds. Investments for which fair value is measured using the NAV per share practical expedient are not classified in the fair value hierarchy. The Company uses a market approach to determine the fair value of its debt instruments, utilizing quoted prices in active markets, interest rates and other relevant information generated by market transactions involving similar instruments. Therefore, the inputs used to measure the fair value of the Company's debt instruments are classified as Level 2 within the fair value hierarchy. The carrying value of Wesco's debt instruments with fixed interest rates was $2,822.8 million and $2,881.2 million as of March 31, 2023 and December 31, 2022, respectively. The estimated fair value of this debt was $2,896.8 million and $2,929.5 million as of March 31, 2023 and December 31, 2022, respectively. The reported carrying values of Wesco's other debt instruments, including those with variable interest rates, approximated their fair values as of March 31, 2023 and December 31, 2022. The Company purchases foreign currency forward contracts to reduce the effect of fluctuations in foreign currency-denominated accounts on its earnings. The foreign currency forward contracts are not designated as hedges for accounting purposes. The Company's strategy is to negotiate terms for its derivatives and other financial instruments to be highly effective, such that the change in the value of the derivative offsets the impact of the underlying hedge. Its counterparties to foreign currency forward contracts have investment-grade credit ratings. The Company regularly monitors the creditworthiness of its counterparties to ensure no issues exist that could affect the value of its derivatives. The Company does not hedge 100% of its foreign currency-denominated accounts. In addition, the results of hedging can vary significantly based on various factors, such as the timing of executing foreign currency forward contracts versus the movement of currencies, as well as fluctuations in the account balances throughout each reporting period. The fair value of foreign currency forward contracts is based on the difference between the contract rate and the current price of a forward contract with an equivalent remaining term. The fair value of foreign currency forward contracts is measured using observable market information. These inputs are considered Level 2 in the fair value hierarchy. At March 31, 2023 and December 31, 2022, foreign currency forward contracts were revalued at then-current foreign exchange rates with the changes in valuation reflected directly in other non-operating expense (income) in the Condensed Consolidated Statements of Income and Comprehensive Income offsetting the transaction gain (loss) recorded on foreign currency-denominated accounts. At March 31, 2023 and December 31, 2022, the gross and net notional amounts of foreign currency forward contracts outstanding were approximately $162.4 million and $172.8 million, respectively. While all of the Company's foreign currency forward contracts are subject to master netting arrangements with its counterparties, assets and liabilities related to these contracts are presented on a gross basis within the Condensed Consolidated Balance Sheets. The gross fair value of assets and liabilities related to foreign currency forward contracts were immaterial.
Derivatives and Fair Value	The Company purchases foreign currency forward contracts to reduce the effect of fluctuations in foreign currency-denominated accounts on its earnings. The foreign currency forward contracts are not designated as hedges for accounting purposes. The Company's strategy is to negotiate terms for its derivatives and other financial instruments to be highly effective, such that the change in the value of the derivative offsets the impact of the underlying hedge. Its counterparties to foreign currency forward contracts have investment-grade credit ratings. The Company regularly monitors the creditworthiness of its counterparties to ensure no issues exist that could affect the value of its derivatives. The Company does not hedge 100% of its foreign currency-denominated accounts. In addition, the results of hedging can vary significantly based on various factors, such as the timing of executing foreign currency forward contracts versus the movement of currencies, as well as fluctuations in the account balances throughout each reporting period. The fair value of foreign currency forward contracts is based on the difference between the contract rate and the current price of a forward contract with an equivalent remaining term. The fair value of foreign currency forward contracts is measured using observable market information. These inputs are considered Level 2 in the fair value hierarchy. At March 31, 2023 and December 31, 2022, foreign currency forward contracts were revalued at then-current foreign exchange rates with the changes in valuation reflected directly in other non-operating expense (income) in the Condensed Consolidated Statements of Income and Comprehensive Income offsetting the transaction gain (loss) recorded on foreign currency-denominated accounts. At March 31, 2023 and December 31, 2022, the gross and net notional amounts of foreign currency forward contracts outstanding were approximately $162.4 million and $172.8 million, respectively. While all of the Company's foreign currency forward contracts are subject to master netting arrangements with its counterparties, assets and liabilities related to these contracts are presented on a gross basis within the Condensed Consolidated Balance Sheets. The gross fair value of assets and liabilities related to foreign currency forward contracts were immaterial.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	From time to time, a number of lawsuits and claims have been or may be asserted against the Company relating to the conduct of its business, including litigation relating to commercial, product and employment matters (including wage and hour). The outcome of any litigation cannot be predicted with certainty, and some lawsuits may be determined adversely to Wesco. However, management does not believe that the ultimate outcome of any such pending matters is likely to have a material adverse effect on Wesco's financial condition or liquidity, although the resolution in any fiscal period of one or more of these matters may have a material adverse effect on Wesco's results of operations for that period.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2022
Income Tax Disclosure [Abstract]
INCOME TAXES	The effective tax rate for the three months ended March 31, 2023 and 2022 was 18.3% and 17.2%, respectively. For the three months ended March 31, 2023 and 2022, the effective tax rate reflects discrete income tax benefits of $21.2 million and $5.8 million, respectively, resulting from the exercise and vesting of stock-based awards. For the three months ended March 31, 2022, the effective tax rate also reflects a discrete income tax benefit of $13.4 million resulting from a reduction to the valuation allowance recorded against foreign tax credit carryforwards. These discrete income tax benefits reduced the estimated annual effective tax rate in such periods by approximately 8.8 and 8.7 percentage points, respectively. The estimated annual effective tax rate differs from the federal statutory income tax rate due primarily to state income taxes and nondeductible expenses. There have been no material adjustments to liabilities for uncertain tax positions since December 31, 2022.

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Segment Reporting Disclosure	13. BUSINESS SEGMENTS The Company has operating segments comprising three strategic business units consisting of EES, CSS and UBS. These operating segments are equivalent to the Company's reportable segments. The Company's chief operating decision maker evaluates the performance of its operating segments based primarily on net sales, adjusted earnings before interest, taxes, depreciation and amortization (“EBITDA”), and adjusted EBITDA margin percentage. The Company incurs corporate costs primarily related to treasury, tax, information technology, legal and other centralized functions. The Company also has various corporate assets. Segment assets may not include jointly used assets, but segment results include depreciation expense or other allocations related to those assets. Interest expense and other non-operating items are either not allocated to the segments or reviewed on a segment basis. Corporate expenses and assets not directly identifiable with a reportable segment are reported in the tables below to reconcile the reportable segments to the consolidated financial statements. The following tables set forth financial information by reportable segment for the periods presented: (In millions) Three Months Ended March 31, 2023 EES CSS UBS Total Net sales $ 2,135.1 $ 1,732.0 $ 1,654.8 $ 5,521.9 Three Months Ended March 31, 2022 (In millions) EES CSS UBS Total Net sales $ 2,090.0 $ 1,434.2 $ 1,408.0 $ 4,932.2 (In millions) Three Months Ended March 31, 2023 EES CSS UBS Adjusted EBITDA $ 183.0 $ 155.5 $ 187.7 Adjusted EBITDA Margin % 8.6 % 9.0 % 11.3 % Three Months Ended March 31, 2022 (In millions) EES CSS UBS Adjusted EBITDA $ 192.4 $ 123.0 $ 136.3 Adjusted EBITDA Margin % 9.2 % 8.6 % 9.7 % The following table sets forth total assets by reportable segment for the periods presented: As of March 31, 2023 (In millions) EES CSS UBS Corporate (1) Total Total assets $ 4,490.9 $ 5,586.0 $ 4,038.1 $ 856.2 $ 14,971.2 As of December 31, 2022 (In millions) EES CSS UBS Corporate (1) Total Total assets $ 4,480.4 $ 5,504.0 $ 3,827.4 $ 999.9 $ 14,811.7 (1) Total assets for Corporate primarily consist of cash and cash equivalents, deferred income taxes, property, buildings and equipment, capitalized cloud computing arrangement costs, operating lease assets, and pension assets. The following tables reconcile net income attributable to common stockholders to adjusted EBITDA and adjusted EBITDA margin % by segment, which are non-GAAP financial measures, for the periods presented: Three Months Ended March 31, 2023 (In millions) EES CSS UBS Corporate Total Net income attributable to common stockholders $ 171.3 $ 135.4 $ 180.3 $ (304.3) $ 182.7 Net (loss) income attributable to noncontrolling interests (0.1) 0.2 — — 0.1 Preferred stock dividends — — — 14.4 14.4 Provision for income taxes — — — 44.1 44.1 Interest expense, net — — — 95.0 95.0 Depreciation and amortization 9.9 18.0 6.0 10.5 44.4 Other expense, net 0.5 0.8 0.6 8.2 10.1 Stock-based compensation expense (1) 1.4 1.1 0.8 7.1 10.4 Merger-related and integration costs — — — 19.5 19.5 Adjusted EBITDA $ 183.0 $ 155.5 $ 187.7 $ (105.5) $ 420.7 Adjusted EBITDA margin % 8.6 % 9.0 % 11.3 % (1) Stock-based compensation expense in the calculation of adjusted EBITDA for the three months ended March 31, 2023 excludes $1.3 million that is included in merger-related and integration costs. Three Months Ended March 31, 2022 (In millions) EES CSS UBS Corporate Total Net income attributable to common stockholders $ 178.7 $ 103.7 $ 129.9 $ (245.5) $ 166.8 Net income attributable to noncontrolling interests 0.2 — — 0.2 0.4 Preferred stock dividends — — — 14.4 14.4 Provision for income taxes — — — 37.7 37.7 Interest expense, net — — — 63.6 63.6 Depreciation and amortization 12.0 18.1 5.8 11.1 47.0 Other (income) expense, net (0.1) 0.3 — 0.9 1.1 Stock-based compensation expense (1) 1.6 0.9 0.6 4.4 7.5 Merger-related and integration costs — — — 25.6 25.6 Adjusted EBITDA $ 192.4 $ 123.0 $ 136.3 $ (87.6) $ 364.1 Adjusted EBITDA margin % 9.2 % 8.6 % 9.7 % (1) Stock-based compensation expense in the calculation of adjusted EBITDA for the three months ended March 31, 2022 excludes $1.4 million that is included in merger-related and integration costs. Note: Adjusted EBITDA and Adjusted EBITDA margin % are non-GAAP financial measures that provide indicators of the Company's performance and its ability to meet debt service requirements. Adjusted EBITDA is defined as earnings before interest, taxes, depreciation and amortization before other non-operating expenses (income), non-cash stock-based compensation expense, and merger-related and integration costs. Adjusted EBITDA margin % is calculated by dividing Adjusted EBITDA by net sales.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2023
Subsequent Events [Abstract]
Subsequent Events [Text Block]	14. SUBSEQUENT EVENTS

Business Combinations and Asset

Business Combinations and Asset Acquisitions	3 Months Ended
	Mar. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Business Combination Disclosure	Rahi Systems Holdings, Inc. On November 1, 2022, through its wholly-owned subsidiary WESCO Distribution, Inc. (“Wesco Distribution”), the Company acquired 100% of the equity securities of Rahi Systems Holdings, Inc. (“Rahi Systems” or “Rahi”). Headquartered in Fremont, California, Rahi Systems is a leading provider of global hyperscale data center solutions with over 900 employees in 25 countries. Rahi's expertise with complex information technology projects and global presence strengthen Wesco's data center solution offerings. Wesco Distribution funded the purchase price paid at closing with cash on hand as well as borrowings under its accounts receivable securitization and revolving credit facilities. Since the initial measurement of the identified assets acquired and liabilities assumed, the Company has recorded adjustments to inventories of $25.4 million and accounts payable of $28.0 million. The net impact of these adjustments was an increase to goodwill of $2.6 million. The estimated fair values of assets acquired and liabilities assumed are based on preliminary calculations and valuations using estimates and assumptions at the time of acquisition. As the Company obtains additional information during the measurement period (not to exceed one year from the acquisition date), estimates and assumptions for the preliminary purchase consideration allocations may change materially. The results of operations of Rahi Systems are included in Wesco's unaudited condensed consolidated financial statements beginning on November 1, 2022, the acquisition date. For the three months ended March 31, 2023, the condensed consolidated statement of income includes $136.3 million of net sales and an immaterial amount of income from operations for Rahi Systems. The Company has not presented supplemental pro forma revenue and earnings of the combined business as the acquisition of Rahi Systems is not material to Wesco's unaudited condensed consolidated financial statements.

ACCOUNTING POLICIES (Policies)

ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of Wesco have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (the “SEC”). The unaudited condensed consolidated financial information should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in WESCO International, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2022, as filed with the SEC on February 21, 2023. The Condensed Consolidated Balance Sheet at December 31, 2022 was derived from the audited Consolidated Financial Statements as of that date, but does not include all the disclosures required by accounting principles generally accepted in the United States of America. The unaudited Condensed Consolidated Balance Sheet as of March 31, 2023, the unaudited Condensed Consolidated Statements of Income and Comprehensive Income, the unaudited Condensed Consolidated Statements of Stockholders' Equity, and the unaudited Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2023, and 2022, respectively, in the opinion of management, have been prepared on the same basis as the audited Consolidated Financial Statements and include all adjustments necessary for the fair statement of the results of the interim periods presented herein. All adjustments reflected in the unaudited condensed consolidated financial information are of a normal recurring nature unless indicated. The results for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year.
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recently Adopted and Recently Issued Accounting Standards
New Accounting Pronouncements, Policy	Recently Adopted and Recently Issued Accounting Standards In September 2022, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2022-04, Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations , which requires that a buyer in a supplier finance program disclose sufficient information about the program to allow a user of financial statements to understand the program's nature, activity during the period, changes from period to period, and potential magnitude. The amendments in this ASU are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. The Company adopted this ASU in the first quarter of 2023, except for the amendment on rollforward information, which the Company will begin disclosing in its Annual Report on Form 10-K for the fiscal year ending December 31, 2023. The adoption of this ASU resulted in additional disclosure of the Company's supplier finance program, as described below. Other pronouncements issued by the FASB or other authoritative accounting standards groups with future effective dates are either not applicable or are not expected to be significant to Wesco’s financial position, results of operations or cash flows.

REVENUE (Tables)

REVENUE (Tables)	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	The following tables disaggregate Wesco’s net sales by segment and geography for the periods presented: Three Months Ended March 31 (In millions) 2023 2022 Electrical & Electronic Solutions $ 2,135.1 $ 2,090.0 Communications & Security Solutions 1,732.0 1,434.2 Utility & Broadband Solutions 1,654.8 1,408.0 Total by segment $ 5,521.9 $ 4,932.2 Three Months Ended March 31 (In millions) 2023 2022 United States $ 4,090.5 $ 3,654.4 Canada 759.4 715.0 Other International (1) 672.0 562.8 Total by geography (2) $ 5,521.9 $ 4,932.2

GOODWILL (Tables)

GOODWILL (Tables)	3 Months Ended
	Mar. 31, 2023
Goodwill [Line Items]
Schedule of Goodwill [Table Text Block]	Three Months Ended March 31, 2023 EES CSS UBS Total (In millions) Beginning balance, January 1 $ 825.5 $ 1,208.9 $ 1,206.5 $ 3,240.9 Foreign currency exchange rate changes 1.3 (0.7) 0.7 1.3 Adjustments to goodwill for acquisitions (1) — 2.6 — 2.6 Ending balance, March 31 $ 826.8 $ 1,210.8 $ 1,207.2 $ 3,244.8 (1) Reflects the effect on goodwill of adjustments to the assets acquired and liabilities assumed in the acquisition of Rahi Systems since their initial measurement, which is part of the CSS segment, as described in Note 4, "Acquisitions".
Schedule of Finite-Lived Intangible Assets	The components of intangible assets are as follows: As of March 31, 2023 December 31, 2022 Life (in years) Gross Carrying Amount (1) Accumulated Amortization (1) Net Carrying Amount Gross Carrying Amount (1) Accumulated Amortization (1) Net Carrying Amount Intangible assets: (In millions) Trademarks Indefinite $ 792.2 $ — $ 792.2 $ 792.1 $ — $ 792.1 Customer relationships 10 - 20 1,516.6 (399.3) 1,117.3 1,516.0 (377.6) 1,138.4 Distribution agreements 15 - 19 29.2 (24.8) 4.4 29.2 (24.4) 4.8 Trademarks 5 and 12 15.5 (7.9) 7.6 15.5 (7.4) 8.1 $ 2,353.5 $ (432.0) $ 1,921.5 $ 2,352.8 $ (409.4) $ 1,943.4
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following table sets forth the remaining estimated amortization expense for intangible assets for the next five years and thereafter: For the year ending December 31, (In millions) 2023 $ 66.6 2024 86.1 2025 83.0 2026 77.7 2027 74.8 Thereafter 741.1

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	During the three months ended March 31, 2023 and 2022, Wesco granted the following stock options, restricted stock units, and performance-based awards at the following weighted-average fair values: Three Months Ended March 31, March 31, Stock options granted 75,182 89,550 Weighted-average fair value $ 76.77 $ 57.26 Restricted stock units granted 170,569 224,946 Weighted-average fair value $ 171.03 $ 122.11 Performance-based awards granted (1) 208,371 83,991 Weighted-average fair value (1) $ 85.94 $ 122.09 (1) As described further below, the three months ended March 31, 2023 includes performance-based awards granted in February 2020 for which actual achievement levels were certified in February 2023.
Share-based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]	The following table sets forth a summary of stock-settled stock appreciation rights and related information for the three months ended March 31, 2023: Awards Weighted- Weighted- Aggregate Outstanding at December 31, 2022 1,248,115 $ 62.02 Granted — — Exercised (339,649) 68.51 Forfeited (638) 72.15 Outstanding at March 31, 2023 907,828 $ 59.59 5.6 $ 86.2 Exercisable at March 31, 2023 865,198 $ 58.72 5.5 $ 82.9 For the three months ended March 31, 2023, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $31.6 million.
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	The following table sets forth a summary of restricted stock units and related information for the three months ended March 31, 2023: Awards Weighted- Unvested at December 31, 2022 774,233 $ 73.79 Granted 170,569 171.03 Vested (323,156) 72.05 Forfeited (184) 102.64 Unvested at March 31, 2023 621,462 $ 101.38
Schedule of Nonvested Performance-based Units Activity [Table Text Block]	The following table sets forth a summary of performance-based awards and related information for the three months ended March 31, 2023: Awards Weighted- Unvested at December 31, 2022 335,329 $ 75.26 Granted (1) 208,371 85.94 Vested (289,394) 48.32 Forfeited — — Unvested at March 31, 2023 254,306 $ 114.66 (1) Includes 63,098 performance-based awards granted in February 2023 with a fair value of $171.96 and three-year performance period ending December 31, 2025, and 144,697 performance-based awards granted in February 2020 with a fair value of $48.32 and three-year performance period ended December 31, 2022 for which actual achievement levels were certified in February 2023.
Share-Based Payment Arrangement, Option, Activity	The following table sets forth a summary of stock options and related information for the three months ended March 31, 2023: Awards Weighted- Weighted- Aggregate Outstanding at December 31, 2022 87,347 $ 121.55 Granted 75,182 170.04 Exercised (1,279) 122.09 Forfeited — — Outstanding at March 31, 2023 161,250 $ 144.15 9.4 $ 2.9 Exercisable at March 31, 2023 27,329 $ 122.09 8.9 $ 0.9 For the three months ended March 31, 2023, the aggregate intrinsic value of stock options exercised during such period was not material.
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The fair values of stock options, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods: Three Months Ended March 31, March 31, Risk free interest rate 4.1 % 1.9 % Expected life (in years) 5 7 Expected volatility 50 % 43 % Expected dividend yield 0.88 % n/a

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of basic and diluted earnings per share for the periods presented: Three Months Ended March 31 (In millions, except per share data) 2023 2022 Net income attributable to WESCO International, Inc. $ 197.1 $ 181.2 Less: Preferred stock dividends 14.4 14.4 Net income attributable to common stockholders $ 182.7 $ 166.8 Weighted-average common shares outstanding used in computing basic earnings per share 51.0 50.6 Common shares issuable upon exercise of dilutive equity awards 1.5 1.6 Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share 52.5 52.2 Earnings per share attributable to common stockholders Basic $ 3.58 $ 3.30 Diluted $ 3.48 $ 3.19

DEBT (Tables)

DEBT (Tables)	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Schedule of Debt	The following table sets forth Wesco's outstanding indebtedness: As of March 31, December 31, (In millions) International lines of credit $ 2.2 $ 7.1 Accounts Receivable Securitization Facility 1,613.0 1,535.0 Revolving Credit Facility 1,189.8 1,023.6 5.50% Anixter Senior Notes due 2023 — 58.6 6.00% Anixter Senior Notes due 2025 4.2 4.2 7.125% Senior Notes due 2025 1,500.0 1,500.0 7.250% Senior Notes due 2028, less debt discount of $6.5 and $6.8 in 2023 and 2022, respectively 1,318.5 1,318.2 Finance lease obligations 22.6 20.6 Total debt 5,650.3 5,467.3 Plus: Fair value adjustments to the Anixter Senior Notes 0.1 0.3 Less: Unamortized debt issuance costs (47.7) (51.1) Less: Short-term debt and current portion of long-term debt (1) (7.6) (70.5) Total long-term debt $ 5,595.1 $ 5,346.0 (1) As of December 31, 2022, short-term debt and current portion of long-term debt included the $58.6 million aggregate principal amount of the Company's 5.50% Anixter Senior Notes due 2023, which matured on March 1, 2023. 5.50% Anixter Senior Notes due 2023 On March 1, 2023, Wesco Distribution repaid the $58.6 million aggregate principal amount of its 5.50% Anixter Senior Notes due 2023 plus accrued interest up to, but not including, the maturity date. The repayment was funded with borrowings under the Company's Revolving Credit Facility and had no impact on the Company's results of operations.

EMPLOYEE BENEFIT PLANS Schedule

EMPLOYEE BENEFIT PLANS Schedule of Net Benefit Costs (Tables)	3 Months Ended
	Mar. 31, 2023
Postemployment Benefits [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	The following table sets forth the components of net periodic pension (benefit) cost for the Company's defined benefit plans: Three Months Ended (In millions) March 31, 2023 March 31, 2022 March 31, 2023 March 31, 2022 March 31, 2023 March 31, 2022 Domestic Plans (1) Foreign Plans (2) Total Service cost $ — $ — $ 1.2 $ 2.2 $ 1.2 $ 2.2 Interest cost 2.6 2.1 2.8 2.3 5.4 4.4 Expected return on plan assets (2.4) (3.5) (3.0) (4.3) (5.4) (7.8) Recognized actuarial gain (3) — — (0.3) (0.2) (0.3) (0.2) Net periodic pension (benefit) cost $ 0.2 $ (1.4) $ 0.7 $ — $ 0.9 $ (1.4) (1) Defined as the Anixter Inc. Pension Plan, Anixter Inc. Executive Benefit Plan, and the Anixter Inc. Supplemental Executive Retirement Plan. (2) Defined as the EECOL Electric ULC Retirement Plan, the EECOL Electric ULC Supplemental Executive Retirement Plan, the Pension Plan for Employees of Anixter Canada Inc., and various defined benefit pension plans covering employees of foreign subsidiaries in Europe. (3) For the three months ended March 31, 2023 and 2022, no material amounts were reclassified from accumulated other comprehensive income into net income.

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	(In millions) Three Months Ended March 31, 2023 EES CSS UBS Total Net sales $ 2,135.1 $ 1,732.0 $ 1,654.8 $ 5,521.9 Three Months Ended March 31, 2022 (In millions) EES CSS UBS Total Net sales $ 2,090.0 $ 1,434.2 $ 1,408.0 $ 4,932.2 (In millions) Three Months Ended March 31, 2023 EES CSS UBS Adjusted EBITDA $ 183.0 $ 155.5 $ 187.7 Adjusted EBITDA Margin % 8.6 % 9.0 % 11.3 % Three Months Ended March 31, 2022 (In millions) EES CSS UBS Adjusted EBITDA $ 192.4 $ 123.0 $ 136.3 Adjusted EBITDA Margin % 9.2 % 8.6 % 9.7 % The following tables reconcile net income attributable to common stockholders to adjusted EBITDA and adjusted EBITDA margin % by segment, which are non-GAAP financial measures, for the periods presented: Three Months Ended March 31, 2023 (In millions) EES CSS UBS Corporate Total Net income attributable to common stockholders $ 171.3 $ 135.4 $ 180.3 $ (304.3) $ 182.7 Net (loss) income attributable to noncontrolling interests (0.1) 0.2 — — 0.1 Preferred stock dividends — — — 14.4 14.4 Provision for income taxes — — — 44.1 44.1 Interest expense, net — — — 95.0 95.0 Depreciation and amortization 9.9 18.0 6.0 10.5 44.4 Other expense, net 0.5 0.8 0.6 8.2 10.1 Stock-based compensation expense (1) 1.4 1.1 0.8 7.1 10.4 Merger-related and integration costs — — — 19.5 19.5 Adjusted EBITDA $ 183.0 $ 155.5 $ 187.7 $ (105.5) $ 420.7 Adjusted EBITDA margin % 8.6 % 9.0 % 11.3 % (1) Stock-based compensation expense in the calculation of adjusted EBITDA for the three months ended March 31, 2023 excludes $1.3 million that is included in merger-related and integration costs. Three Months Ended March 31, 2022 (In millions) EES CSS UBS Corporate Total Net income attributable to common stockholders $ 178.7 $ 103.7 $ 129.9 $ (245.5) $ 166.8 Net income attributable to noncontrolling interests 0.2 — — 0.2 0.4 Preferred stock dividends — — — 14.4 14.4 Provision for income taxes — — — 37.7 37.7 Interest expense, net — — — 63.6 63.6 Depreciation and amortization 12.0 18.1 5.8 11.1 47.0 Other (income) expense, net (0.1) 0.3 — 0.9 1.1 Stock-based compensation expense (1) 1.6 0.9 0.6 4.4 7.5 Merger-related and integration costs — — — 25.6 25.6 Adjusted EBITDA $ 192.4 $ 123.0 $ 136.3 $ (87.6) $ 364.1 Adjusted EBITDA margin % 9.2 % 8.6 % 9.7 % (1) Stock-based compensation expense in the calculation of adjusted EBITDA for the three months ended March 31, 2022 excludes $1.4 million that is included in merger-related and integration costs.
Reconciliation of Assets from Segment to Consolidated	The following table sets forth total assets by reportable segment for the periods presented: As of March 31, 2023 (In millions) EES CSS UBS Corporate (1) Total Total assets $ 4,490.9 $ 5,586.0 $ 4,038.1 $ 856.2 $ 14,971.2 As of December 31, 2022 (In millions) EES CSS UBS Corporate (1) Total Total assets $ 4,480.4 $ 5,504.0 $ 3,827.4 $ 999.9 $ 14,811.7 (1) Total assets for Corporate primarily consist of cash and cash equivalents, deferred income taxes, property, buildings and equipment, capitalized cloud computing arrangement costs, operating lease assets, and pension assets.

ACCOUNTING POLICIES (Details)

ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Supplier Finance Program, Obligation	$ 30	$ 30.7

REVENUE (Details)

REVENUE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Deferred Revenue	$ 112.2		$ 99.6
Revenue from Contract with Customer, Excluding Assessed Tax	5,521.9	$ 4,932.2
Cost of goods sold	4,313.4	3,883.1
Contract with Customer, Refund Liability	43.9		$ 46.5
EES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,135.1	2,090
CSS
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,732	1,434.2
UBS
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,654.8	1,408
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,090.5	3,654.4
CANADA
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	759.4	715
Non-US [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	672	562.8
Shipping and Handling [Member]
Disaggregation of Revenue [Line Items]
Cost of goods sold	$ 76.9	$ 67.6

REVENUE Deferred Revenue (Detai

REVENUE Deferred Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Deferred Revenue	$ 112.2	$ 99.6
Contract with Customer, Asset, before Allowance for Credit Loss	34.8	$ 27.5
Deferred Revenue, Revenue Recognized	$ 21

REVENUE Shipping and Handling C

REVENUE Shipping and Handling Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cost of goods sold	$ 4,313.4	$ 3,883.1
Shipping and Handling [Member]
Cost of goods sold	$ 76.9	$ 67.6

REVENUE Variable Consideration

REVENUE Variable Consideration (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue, Methods, Inputs, and Assumptions Used [Abstract]
Revenue, Variable Consideration Constraint Increase (Decrease)	$ 96.5	$ 95.1
Prior Period Adjustment [Abstract]
Prior Period Reclassification Adjustment		$ (20.1)

REVENUE Revenue, Performance Ob

REVENUE Revenue, Performance Obligation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue from Contract with Customer [Abstract]
Cost of goods sold	$ 4,313.4	$ 3,883.1

GOODWILL (Details)

GOODWILL (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 3,244.8		$ 3,240.9
Goodwill, Foreign Currency Translation Gain (Loss)	1.3
Goodwill, Purchase Accounting Adjustments	2.6
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,353.5		2,352.8
Finite-Lived Intangible Assets, Accumulated Amortization	(432)		(409.4)
Finite-Lived Intangible Assets, Net	1,921.5		1,943.4
Finite-Lived Intangible Asset, Expected Amortization, Year One	66.6
Finite-Lived Intangible Asset, Expected Amortization, Year Two	86.1
Finite-Lived Intangible Asset, Expected Amortization, Year Three	83
Finite-Lived Intangible Asset, Expected Amortization, Year Four	77.7
Finite-Lived Intangible Asset, Expected Amortization, Year Five	74.8
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	741.1
Amortization of Intangible Assets	22	$ 25.7
Amortization of Intangible Assets	22	$ 25.7
Finite-Lived Intangible Asset, Expected Amortization, Year Three	83
Finite-Lived Intangible Asset, Expected Amortization, Year Four	77.7
Finite-Lived Intangible Asset, Expected Amortization, Year Five	74.8
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	741.1
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	15.5		15.5
Finite-Lived Intangible Assets, Accumulated Amortization	(7.9)		(7.4)
Finite-Lived Intangible Assets, Net	$ 7.6		8.1
Trademarks [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,516.6		1,516
Finite-Lived Intangible Assets, Accumulated Amortization	(399.3)		(377.6)
Finite-Lived Intangible Assets, Net	$ 1,117.3		1,138.4
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Distribution Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 29.2		29.2
Finite-Lived Intangible Assets, Accumulated Amortization	(24.8)		(24.4)
Finite-Lived Intangible Assets, Net	$ 4.4		4.8
Distribution Rights [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Distribution Rights [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	19 years
EES
Goodwill [Line Items]
Goodwill	$ 826.8		825.5
Goodwill, Foreign Currency Translation Gain (Loss)	1.3
Goodwill, Purchase Accounting Adjustments	0
CSS
Goodwill [Line Items]
Goodwill	1,210.8		1,208.9
Goodwill, Acquired During Period	(0.7)
Goodwill, Purchase Accounting Adjustments	2.6
UBS
Goodwill [Line Items]
Goodwill	1,207.2		1,206.5
Goodwill, Acquired During Period	0.7
Goodwill, Purchase Accounting Adjustments	0
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 792.2		$ 792.1

STOCK-BASED COMPENSATION AWARDS

STOCK-BASED COMPENSATION AWARDS (Details) - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	170,569	224,946
Granted, Weighted Average Fair Value (in dollars per share)	$ 171.03	$ 122.11
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	208,371	83,991
Granted, Weighted Average Fair Value (in dollars per share)	$ 85.94	$ 122.09
Performance Shares [Member] | 2020 Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	144,697
Granted, Weighted Average Fair Value (in dollars per share)	$ 48.32
Performance Shares [Member] | 2023 Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	63,098
Granted, Weighted Average Fair Value (in dollars per share)	$ 171.96
Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	75,182	89,550
Granted, Weighted Average Fair Value (in dollars per share)	$ 76.77	$ 57.26

SCHEDULE OF SHARE-BASED COMPENS

SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	907,828	1,248,115
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 59.59	$ 62.02
Granted (in shares)	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised	(339,649)
Weighted Average Exercise Price, Exercises in Period (in dollars per share)	$ 68.51
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures	(638)
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)	$ 72.15
Weighted Average Remaining Contractual Term, Outstanding (in years)	5 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding	$ 86.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	865,198
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 58.72
Weighted Average Remaining Contractual Term, Exercisable (in years)	5 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 82.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 31.6

SCHEDULE OF SHARE-BASED PAYMENT

SCHEDULE OF SHARE-BASED PAYMENT AWARD, VALUATION ASSUMPTIONS (Details)	3 Months Ended
	Mar. 31, 2023 Rate	Mar. 31, 2022 Rate
Share-Based Payment Arrangement [Abstract]
WESCO expected volatility	50%	43%
Risk free interest rate	4.10%	1.90%
Expected life (in years)	5 years	7 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.88%

SUMMARY OF RESTRICTED STOCK UNI

SUMMARY OF RESTRICTED STOCK UNITS (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based awards outstanding (in shares)	621,462		774,233
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 101.38		$ 73.79
Granted (in shares)	170,569	224,946
Granted, Weighted Average Fair Value (in dollars per share)	$ 171.03	$ 122.11
Vested (in shares)	(323,156)
Vested in Period, Weighted Average Fair Value (in dollars per share)	$ 72.05
Forfeited (in shares)	(184)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 102.64

SUMMARY OF PERFORMANCE-BASED AW

SUMMARY OF PERFORMANCE-BASED AWARDS (Details) - Performance Shares [Member] - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	254,306		335,329
Granted (in shares)	208,371	83,991
Vested (in shares)	(289,394)
Forfeited (in shares)	0
Unvested, Weighted Average Fair Value (in dollars per share)	$ 114.66		$ 75.26
Granted, Weighted Average Fair Value (in dollars per share)	85.94	$ 122.09
Forfeited in Period, Weighted Average Fair Value (in dollars per share)	$ 0

STOCK-BASED COMPENSATION (Detai

STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 11.7	$ 8.9
Total unrecognized compensation cost	$ 85.2
Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 1.9	$ 16.7	$ 31.5	$ 35.1

Summary of Non-Qualified Stock

Summary of Non-Qualified Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	907,828		1,248,115
Granted (in shares)	0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised	(339,649)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures	(638)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	865,198
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 59.59		$ 62.02
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	0
Weighted Average Exercise Price, Exercises in Period (in dollars per share)	68.51
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)	72.15
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 58.72
Weighted Average Remaining Contractual Term, Outstanding (in years)	5 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding	$ 86.2
Weighted Average Remaining Contractual Term, Exercisable (in years)	5 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 82.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 31.6
Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	161,250		87,347
Granted (in shares)	75,182	89,550
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised	(1,279)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	27,329
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 144.15		$ 121.55
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	170.04
Weighted Average Exercise Price, Exercises in Period (in dollars per share)	122.09
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)	0
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 122.09
Weighted Average Remaining Contractual Term, Outstanding (in years)	9 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding	$ 2.9
Weighted Average Remaining Contractual Term, Exercisable (in years)	8 years 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 0.9

SCHEDULE OF EARNINGS PER SHARE,

SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 197.1	$ 181.2
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	51	50.6
Common shares issuable upon exercise of dilutive stock options (in shares)	1.5	1.6
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	52.5	52.2
Diluted (in dollars per share)	$ 3.48	$ 3.19
Basic (in dollars per share)	$ 3.58	$ 3.30
Net Income (Loss) Available to Common Stockholders, Basic	$ 182.7	$ 166.8
Preferred Stock Dividends, Income Statement Impact	$ 14.4	$ 14.4

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Stock Appreciation Rights (SARs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.4	0.1

SCHEDULE OF DEBT (Details)

SCHEDULE OF DEBT (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Finance lease obligations	$ 22.6	$ 20.6
Total debt	5,650.3	5,467.3
Fair value adjustment to the Anixter Notes	0.1	0.3
Unamortized debt issuance costs	(47.7)	(51.1)
Short-term debt and current portion of long-term debt	(7.6)	(70.5)
Total long-term debt	5,595.1	5,346
Foreign Line of Credit
Debt Instrument [Line Items]
Long-term Debt	2.2	7.1
Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Long-term Debt	1,613	1,535
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt	1,189.8	1,023.6
5.50% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term Debt	0	58.6
6.00% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term Debt	4.2	4.2
7.125% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term Debt	1,500	1,500
7.250% Senior Notes due 2028
Debt Instrument [Line Items]
Long-term Debt	1,318.5	1,318.2
Debt Instrument, Unamortized Discount	$ 6.5	$ 6.8

DEBT (Details)

DEBT (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Long-term Debt	$ 1,613	$ 1,535
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt	1,189.8	1,023.6
5.50% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term Debt	0	58.6
6.00% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term Debt	4.2	4.2
7.125% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term Debt	1,500	1,500
7.250% Senior Notes due 2028
Debt Instrument [Line Items]
Long-term Debt	$ 1,318.5	$ 1,318.2

Defined Contribution Plans (Det

Defined Contribution Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Postemployment Benefits [Abstract]
Defined Contribution Plan, Cost	$ 21.4	$ 18.1

Defined Benefit Plans (Details)

Defined Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.2	$ 2.2
Interest cost	5.4	4.4
Expected return on plan assets	(5.4)	(7.8)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(0.3)	(0.2)
Net periodic benefit cost	0.9	(1.4)
Defined Benefit Plan, Service Cost	1.2	2.2
Defined Benefit Plan, Plan Assets, Contributions by Employer	2.4
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	2.6	2.1
Expected return on plan assets	(2.4)	(3.5)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	0
Net periodic benefit cost	0.2	(1.4)
Defined Benefit Plan, Service Cost	0	0
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.2	2.2
Interest cost	2.8	2.3
Expected return on plan assets	(3)	(4.3)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(0.3)	(0.2)
Net periodic benefit cost	0.7	0
Defined Benefit Plan, Service Cost	1.2	2.2
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	7
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Nonoperating Gains (Losses)	$ (0.3)	$ (3.6)

Compensation Related Costs, Pos

Compensation Related Costs, Postemployment Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Defined Contribution Plan Disclosure [Line Items]
Service cost	$ 1.2	$ 2.2
Interest cost	5.4	4.4
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	5.4	7.8
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0.3	0.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	0.9	(1.4)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	2.4
WESCODeferredCompensationPlanMember
Defined Contribution Plan Disclosure [Line Items]
Deferred Compensation Liability, Classified, Noncurrent	24.7		$ 20.3
Pension Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other Nonoperating Gains (Losses)	(0.3)	(3.6)
UNITED STATES
Defined Contribution Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	2.6	2.1
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	2.4	3.5
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	0.2	(1.4)
Foreign Plan
Defined Contribution Plan Disclosure [Line Items]
Service cost	1.2	2.2
Interest cost	2.8	2.3
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	3	4.3
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0.3	0.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 0.7	$ 0

FAIR VALUE (Details)

FAIR VALUE (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Notional Amount	$ 162.4	$ 172.8
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	2,896.8	2,929.5
Long-term Debt	$ 2,822.8	$ 2,881.2

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Contingency [Line Items]
Effective tax rate	18.30%	17.20%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount	$ 21.2	$ 5.8
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 13.4

INCOME TAXES Income Tax Rates (

INCOME TAXES Income Tax Rates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	18.30%	17.20%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	880%	870%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount	$ 21.2	$ 5.8

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Reporting [Abstract]
Revenues	$ 5,521.9	$ 4,932.2
Operating Income (Loss)	346.4	284
Adjusted EBITDA	420.7	364.1
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,521.9	4,932.2
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	346.4	284
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	14,971.2		$ 14,811.7
EES
Segment Reporting [Abstract]
Adjusted EBITDA	$ 183	$ 192.4
Adjusted EBITDA Margin %	8.60%	9.20%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,135.1	$ 2,090
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,490.9		4,480.4
CSS
Segment Reporting [Abstract]
Adjusted EBITDA	$ 155.5	$ 123
Adjusted EBITDA Margin %	9%	8.60%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,732	$ 1,434.2
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	5,586		5,504
UBS
Segment Reporting [Abstract]
Adjusted EBITDA	$ 187.7	$ 136.3
Adjusted EBITDA Margin %	11.30%	9.70%
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,654.8	$ 1,408
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,038.1		3,827.4
Corporate Segment
Segment Reporting [Abstract]
Adjusted EBITDA	(105.5)	$ (87.6)
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 856.2		$ 999.9

Segment Reporting - ADJ EBITDA

Segment Reporting - ADJ EBITDA Reconciliations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net Income (Loss) Available to Common Stockholders, Basic	$ 182.7	$ 166.8
Net (loss) income attributable to noncontrolling interest	0.1	0.4
Preferred Stock Dividends, Income Statement Impact	14.4	14.4
Provision for income taxes	44.1	37.7
Interest expense, net	95	63.6
Depreciation and amortization	44.4	47
Other expense, net	10.1	1.1
StockBasedCompensationExpenseEBITDA	10.4	7.5
MergerRelatedAndIntegrationCosts	19.5	25.6
Adjusted EBITDA	420.7	364.1
Stock-based compensation expense	11.7	8.9
Merger Related Stock Based Compensation Expense	1.3	1.4
EES
Net Income (Loss) Available to Common Stockholders, Basic	171.3	178.7
Net (loss) income attributable to noncontrolling interest	(0.1)	0.2
Preferred Stock Dividends, Income Statement Impact	0	0
Provision for income taxes	0	0
Interest expense, net	0	0
Depreciation and amortization	9.9	12
Other expense, net	0.5	(0.1)
StockBasedCompensationExpenseEBITDA	1.4	1.6
MergerRelatedAndIntegrationCosts	0	0
Adjusted EBITDA	$ 183	$ 192.4
Adjusted EBITDA Margin %	8.60%	9.20%
CSS
Net Income (Loss) Available to Common Stockholders, Basic	$ 135.4	$ 103.7
Net (loss) income attributable to noncontrolling interest	0.2	0
Preferred Stock Dividends, Income Statement Impact	0	0
Provision for income taxes	0	0
Interest expense, net	0	0
Depreciation and amortization	18	18.1
Other expense, net	0.8	0.3
StockBasedCompensationExpenseEBITDA	1.1	0.9
MergerRelatedAndIntegrationCosts	0	0
Adjusted EBITDA	$ 155.5	$ 123
Adjusted EBITDA Margin %	9%	8.60%
UBS
Net Income (Loss) Available to Common Stockholders, Basic	$ 180.3	$ 129.9
Net (loss) income attributable to noncontrolling interest	0	0
Preferred Stock Dividends, Income Statement Impact	0	0
Provision for income taxes	0	0
Interest expense, net	0	0
Depreciation and amortization	6	5.8
Other expense, net	0.6	0
StockBasedCompensationExpenseEBITDA	0.8	0.6
MergerRelatedAndIntegrationCosts	0	0
Adjusted EBITDA	$ 187.7	$ 136.3
Adjusted EBITDA Margin %	11.30%	9.70%
Corporate Segment
Net Income (Loss) Available to Common Stockholders, Basic	$ (304.3)	$ (245.5)
Net (loss) income attributable to noncontrolling interest	0	0.2
Preferred Stock Dividends, Income Statement Impact	14.4	14.4
Provision for income taxes	44.1	37.7
Interest expense, net	95	63.6
Depreciation and amortization	10.5	11.1
Other expense, net	8.2	0.9
StockBasedCompensationExpenseEBITDA	7.1	4.4
MergerRelatedAndIntegrationCosts	19.5	25.6
Adjusted EBITDA	$ (105.5)	$ (87.6)

Business Combinations and Ass_2

Business Combinations and Asset Acquisitions (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Asset Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Reasons	The estimated fair values of assets acquired and liabilities assumed are based on preliminary calculations and valuations using estimates and assumptions at the time of acquisition. As the Company obtains additional information during the measurement period (not to exceed one year from the acquisition date), estimates and assumptions for the preliminary purchase consideration allocations may change materially.
Goodwill, Purchase Accounting Adjustments	$ 2.6
Rahi Systems
Asset Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 136.3
Business Acquisition, Description of Acquired Entity	Headquartered in Fremont, California, Rahi Systems is a leading provider of global hyperscale data center solutions with over 900 employees in 25 countries.
Business Combination, Reason for Business Combination	Rahi's expertise with complex information technology projects and global presence strengthen Wesco's data center solution offerings.
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory	$ 25.4
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayable	28
Goodwill, Purchase Accounting Adjustments	$ 2.6