10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2019

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                     to                     

Commission File Number: 001-14989

WESCO International, Inc.

(Exact name of registrant as specified in its charter)

Delaware		25-1723342
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)
225 West Station Square Drive Suite 700		15219
Pittsburgh,	Pennsylvania	(Zip Code)
(Address of principal executive offices)

(412) 454-2200

(Registrant's telephone number, including area code)

Not applicable.

(Former name, former address and former fiscal year, if changed since last report)

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

Title of Class	Trading Symbol(s)	Name of Exchange on which registered
Common Stock, par value $.01 per share	WCC	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for at least the past 90 days.              Yes ☑ No ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ☑ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☑	Accelerated filer	☐
Non-accelerated filer ☐		Smaller reporting company	☐
		Emerging growth company	☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☑

As of August 1, 2019, 42,478,200 shares of common stock, $0.01 par value, of the registrant were outstanding.

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

QUARTERLY REPORT ON FORM 10-Q

Table of Contents

	Page
PART I—FINANCIAL INFORMATION
Item 1. Financial Statements.	2
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations.	23
Item 3. Quantitative and Qualitative Disclosures About Market Risk.	29
Item 4. Controls and Procedures.	29
PART II—OTHER INFORMATION
Item 1. Legal Proceedings.	30
Item 1A. Risk Factors.	30
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.	30
Item 6. Exhibits.	31
Signatures	32

1

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements.

The interim financial information required by this item is set forth in the unaudited Condensed Consolidated Financial Statements and Notes thereto in this Quarterly Report on Form 10-Q, as follows:

	Page
Condensed Consolidated Balance Sheets (unaudited)	3
Condensed Consolidated Statements of Income and Comprehensive Income (unaudited)	4
Condensed Consolidated Statements of Cash Flows (unaudited)	5
Condensed Consolidated Statements of Stockholders' Equity (unaudited)	6
Notes to Condensed Consolidated Financial Statements (unaudited)	8

2

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands of dollars, except share data)

(unaudited)

	As of
Assets	June 30, 2019			December 31, 2018
Current assets:
Cash and cash equivalents	$	87,218		$	96,343
Trade accounts receivable, net of allowance for doubtful accounts of $25,821 and $24,468 in 2019 and 2018, respectively	1,355,541			1,166,607
Other accounts receivable	65,694			96,984
Inventories	1,004,127			948,726
Prepaid expenses and other current assets	72,284			76,980
Total current assets	2,584,864			2,385,640
Property, buildings and equipment, net of accumulated depreciation of $293,076 and $291,811 in 2019 and 2018, respectively	172,359			160,878
Operating lease assets (Notes 2 and 4)	233,403			—
Intangible assets, net of accumulated amortization of $271,598 and $249,539 in 2019 and 2018, respectively	304,392			316,016
Goodwill	1,752,800			1,722,603
Other assets	20,118			19,899
Total assets	$	5,067,936		$	4,605,036
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable	$	868,605		$	794,348
Accrued payroll and benefit costs	43,409			88,105
Short-term debt	27,217			30,785
Current portion of long-term debt, net of debt discount and debt issuance costs of $488 in 2018	396			25,429
Bank overdrafts	32,493			17,818
Other current liabilities (Note 4)	152,712			105,461
Total current liabilities	1,124,832			1,061,946
Long-term debt, net of debt discount and debt issuance costs of $7,773 and $9,243 in 2019 and 2018, respectively	1,399,486			1,167,311
Operating lease liabilities (Notes 2 and 4)	177,907			—
Deferred income taxes	147,306			143,967
Other noncurrent liabilities	83,582			102,086
Total liabilities	$	2,933,113		$	2,475,310
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	—			—
Common stock, $.01 par value; 210,000,000 shares authorized, 59,292,704 and 59,157,696 shares issued and 42,477,792 and 45,106,085 shares outstanding in 2019 and 2018, respectively	593			592
Class B nonvoting convertible common stock, $.01 par value; 20,000,000 shares authorized, 4,339,431 issued and no shares outstanding in 2019 and 2018, respectively	43			43
Additional capital	998,218			993,666
Retained earnings	2,412,768			2,307,462
Treasury stock, at cost; 21,154,343 and 18,391,042 shares in 2019 and 2018, respectively	(904,873		)	(758,018		)
Accumulated other comprehensive loss	(365,674		)	(408,435		)
Total WESCO International, Inc. stockholders' equity	2,141,075			2,135,310
Noncontrolling interests	(6,252		)	(5,584		)
Total stockholders’ equity	2,134,823			2,129,726
Total liabilities and stockholders’ equity	$	5,067,936		$	4,605,036

The accompanying notes are an integral part of the condensed consolidated financial statements.

3

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

(In thousands of dollars, except per share data)

(unaudited)

	Three Months Ended						Six Months Ended
	June 30						June 30
	2019			2018			2019			2018
Net sales (Note 3)	$	2,150,088		$	2,103,994		$	4,111,355		$	4,097,909
Cost of goods sold (excluding depreciation and
amortization)	1,741,114			1,704,100			3,319,886			3,318,066
Selling, general and administrative expenses	295,842			292,888			592,370			583,717
Depreciation and amortization	15,182			15,823			30,424			31,703
Income from operations	97,950			91,183			168,675			164,423
Net interest and other	17,307			17,741			34,427			37,524
Income before income taxes	80,643			73,442			134,248			126,899
Provision for income taxes	17,428			15,769			29,084			26,255
Net income	63,215			57,673			105,164			100,644
Less: Net loss attributable to noncontrolling interests	(249		)	(267		)	(668		)	(1,717		)
Net income attributable to WESCO International, Inc.	$	63,464		$	57,940		$	105,832		$	102,361
Other comprehensive income (loss):
Foreign currency translation adjustments	20,244			(28,715		)	42,763			(57,515		)
Comprehensive income attributable to WESCO International, Inc.	$	83,708		$	29,225		$	148,595		$	44,846
Earnings per share attributable to WESCO International, Inc.
Basic	$	1.46		$	1.23		$	2.39		$	2.18
Diluted	$	1.45		$	1.22		$	2.37		$	2.15

The accompanying notes are an integral part of the condensed consolidated financial statements.

4

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands of dollars)

(unaudited)

	Six Months Ended
	June 30
	2019			2018
Operating activities:
Net income	$	105,164		$	100,644
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,424			31,703
Deferred income taxes	1,983			6,100
Other operating activities, net	11,961			11,027
Changes in assets and liabilities:
Trade accounts receivable, net	(157,387		)	(102,567		)
Other accounts receivable	32,150			38,430
Inventories	(39,655		)	11,407
Prepaid expenses and other assets	(7,710		)	(12,866		)
Accounts payable	62,484			26,073
Accrued payroll and benefit costs	(43,739		)	(16,588		)
Other current and noncurrent liabilities	(4,450		)	(6,542		)
Net cash (used in) provided by operating activities	(8,775		)	86,821
Investing activities:
Capital expenditures	(21,402		)	(16,384		)
Acquisition payments	(27,742		)	—
Other investing activities	(1,155		)	(8,684		)
Net cash used in investing activities	(50,299		)	(25,068		)
Financing activities:
Proceeds from issuance of short-term debt	34,866			87,861
Repayments of short-term debt	(64,166		)	(85,761		)
Proceeds from issuance of long-term debt	883,508			794,888
Repayments of long-term debt	(654,274		)	(848,888		)
Repurchases of common stock (Note 8)	(152,722		)	(1,891		)
Increase (decrease) in bank overdrafts	14,676			(9,408		)
Repayment of deferred acquisition payable	(11,401		)	—
Other financing activities, net	(472		)	(550		)
Net cash provided by (used in) financing activities	50,015			(63,749		)
Effect of exchange rate changes on cash and cash equivalents	(66		)	(5,017		)
Net change in cash and cash equivalents	(9,125		)	(7,013		)
Cash and cash equivalents at the beginning of period	96,343			117,953
Cash and cash equivalents at the end of period	$	87,218		$	110,940
Supplemental disclosures:
Cash paid for interest	$	32,787		$	32,380
Cash paid for income taxes	35,329			33,792
The accompanying notes are an integral part of the condensed consolidated financial statements.

5

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(In thousands of dollars)

(unaudited)

																						Accumulated Other
					Class B						Retained											Comprehensive
	Common Stock				Common Stock			Additional			Earnings			Treasury Stock					Noncontrolling			Income
	Amount		Shares		Amount		Shares	Capital			(Deficit)			Amount			Shares		Interests			(Loss)
Balance, December 31, 2018	$	592	59,157,696		$	43	4,339,431	$	993,666		$	2,307,462		$	(758,018	)	(18,391,042	)	$	(5,584	)	$	(408,435	)
Exercise of stock-based awards	1		156,760					(90		)				(54		)	(184	)
Stock-based compensation expense								4,665
Repurchases of common stock								19,144						(19,144		)	(365,272	)
Tax withholding related to vesting of restricted stock units and retirement of common stock	—		(42,564	)				(1,822		)	(531		)
Noncontrolling interests																			(419		)
Net income attributable to WESCO											42,369
Translation adjustments																						22,517
Balance, March 31, 2019	$	593	59,271,892		$	43	4,339,431	$	1,015,563		$	2,349,300		$	(777,216	)	(18,756,498	)	$	(6,003	)	$	(385,918	)
Exercise of stock-based awards	—		20,831					6						(157		)	(3,029	)
Stock-based compensation expense								5,150
Repurchases of common stock								(22,500		)				(127,500		)	(2,394,816	)
Tax withholding related to vesting of restricted stock units and retirement of common stock	—		(19	)				(1		)	4
Noncontrolling interests																			(249		)
Net income attributable to WESCO											63,464
Translation adjustments																						20,244
Balance, June 30, 2019	$	593	59,292,704		$	43	4,339,431	$	998,218		$	2,412,768		$	(904,873	)	(21,154,343	)	$	(6,252	)	$	(365,674	)

The accompanying notes are an integral part of the condensed consolidated financial statements.

6

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(In thousands of dollars)

(unaudited)

																					Accumulated Other
					Class B						Retained										Comprehensive
	Common Stock				Common Stock			Additional			Earnings		Treasury Stock					Noncontrolling			Income
	Amount		Shares		Amount		Shares	Capital			(Deficit)		Amount			Shares		Interests			(Loss)
Balance, December 31, 2017	$	591	59,045,762		$	43	4,339,431	$	999,156		$	2,079,697	$	(647,158	)	(16,375,653	)	$	(3,596	)	$	(312,590	)
Exercise of stock-based awards	—		88,554					(67		)			(455		)	(5,521	)
Stock-based compensation expense								3,858
Tax withholding related to vesting of restricted stock units and retirement of common stock	—		(16,614	)				(1,153		)	417
Noncontrolling interests																		(1,450		)
Net income attributable to WESCO											44,421
Translation adjustments																					(28,800		)
Balance, March 31, 2018	$	591	59,117,702		$	43	4,339,431	$	1,001,794		$	2,124,535	$	(647,613	)	(16,381,174	)	$	(5,046	)	$	(341,390	)
Exercise of stock-based awards	—		26,867					(31		)			(230		)	(3,795	)
Stock-based compensation expense								4,102
Tax withholding related to vesting of restricted stock units and retirement of common stock	—		—					32			11
Noncontrolling interests																		(267		)
Net income attributable to WESCO											57,940
Translation adjustments																					(28,715		)
Balance, June 30, 2018	$	591	59,144,569		$	43	4,339,431	$	1,005,897		$	2,182,486	$	(647,843	)	(16,384,969	)	$	(5,313	)	$	(370,105	)

The accompanying notes are an integral part of the condensed consolidated financial statements.

7

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

1. ORGANIZATION

WESCO International, Inc. ("WESCO International") and its subsidiaries (collectively, “WESCO” or the "Company"), headquartered in Pittsburgh, Pennsylvania, is a full-line distributor of electrical, industrial and communications maintenance, repair and operating ("MRO") and original equipment manufacturer ("OEM") products, construction materials, and advanced supply chain management and logistics services used primarily in the industrial, construction, utility and commercial, institutional and government markets. WESCO serves approximately 70,000 active customers globally through approximately 500 branches primarily located in North America, with operations in 15 additional countries and 10 distribution centers located in the United States and Canada.

2. 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’s 2018 Annual Report on Form 10-K as filed with the SEC on February 27, 2019. The Condensed Consolidated Balance Sheet at December 31, 2018 was derived from the audited Consolidated Financial Statements as of that date, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America.

The unaudited Condensed Consolidated Balance Sheet as of June 30, 2019, the unaudited Condensed Consolidated Statements of Income and Comprehensive Income, and the unaudited Condensed Consolidated Statements of Stockholders' Equity for the three and six months ended June 30, 2019 and 2018, and the unaudited Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2019 and 2018, 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 Accounting Pronouncements

Effective January 1, 2019, WESCO adopted Accounting Standards Update (ASU) 2016-02, Leases, and all the related amendments (“Topic 842”), a comprehensive new standard that amended various aspects of existing accounting guidance for leases. The adoption of Topic 842 resulted in the recognition of right-of-use assets and lease liabilities for operating leases of approximately $240 million and $245 million, respectively, in the Consolidated Balance Sheet as of January 1, 2019, most of which relate to real estate. The adoption of Topic 842 did not have a material impact on the Consolidated Statements of Income and Comprehensive Income or Consolidated Statements of Cash Flows for the three and six months ended June 30, 2019, respectively.

The Company used the optional effective date transition method and therefore did not adjust the prior comparative periods presented herein. There was no cumulative-effect adjustment to beginning retained earnings as a result of using this method. In addition, the Company elected the package of practical expedients that allowed the adoption of Topic 842 without reassessing arrangements that commenced prior to the effective date. Additional qualitative and quantitative information about the Company's leases is disclosed in Note 4.

Recently Issued Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which introduces new guidance for the accounting for credit losses on certain financial instruments. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. Management does not expect the adoption of this accounting standard to have a material impact on its consolidated financial statements and notes thereto.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, which amends the disclosure requirements for recurring and nonrecurring fair value measurements by removing, modifying and adding certain disclosures. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted.

8

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

Management does not expect the adoption of this accounting standard to have a material impact on its consolidated financial statements and notes thereto.

In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans, which amends the disclosure requirements for all employers that sponsor defined benefit pension and other post retirement plans by removing and adding certain disclosures. The amendments in this ASU are effective for fiscal years ending after December 15, 2020. Early adoption is permitted. Management does not expect the adoption of this accounting standard to have a material impact on its consolidated financial statements and notes thereto.

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.

3. REVENUE

WESCO distributes products and provides services to customers globally within the following end markets: (1) industrial, (2) construction, (3) utility, and (4) commercial, institutional and government. Revenue is measured as the amount of consideration WESCO expects to receive in exchange for transferring goods or providing services.

The following tables disaggregate WESCO’s revenue by end market and geography:

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands)	2019		2018		2019		2018
Industrial	$	761,934	$	760,741	$	1,498,825	$	1,519,723
Construction	704,183		683,752		1,337,483		1,321,551
Utility	346,941		336,961		655,213		652,506
Commercial, Institutional and Government	337,030		322,540		619,834		604,129
Total by end market	$	2,150,088	$	2,103,994	$	4,111,355	$	4,097,909

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands)	2019		2018		2019		2018
United States	$	1,616,347	$	1,563,392	$	3,077,263	$	3,046,140
Canada (1)	415,030		405,981		799,700		804,689
Other International (1)	118,711		134,621		234,392		247,080
Total by geography	$	2,150,088	$	2,103,994	$	4,111,355	$	4,097,909

⁽¹⁾  The prior period has been reclassified to conform to the current period presentation.

In accordance with certain contractual arrangements, WESCO receives payment from its customers in advance and recognizes such payment as deferred revenue. Revenue for advance payment is recognized 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 customer’s advance payment. At June 30, 2019 and December 31, 2018, $10.4 million and $11.8 million, respectively, of deferred revenue was recorded as a component of other current liabilities in the Condensed Consolidated Balance Sheets.

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 anticipated performance, historical data, as well as current and forecasted information. Measurement and recognition of variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended June 30, 2019 and 2018 by approximately $28.5 million and $25.0 million, respectively, and by approximately $53.8 million and $49.4 million for the six months ended June 30, 2019 and 2018, respectively.

9

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

Shipping and handling costs are recognized in net sales when they are billed to the customer. These costs are recognized as a component of selling, general and administrative expenses when WESCO does not bill the customer. WESCO has elected to recognize shipping and handling costs as a fulfillment cost. Shipping and handling costs recorded as a component of selling, general and administrative expenses totaled $18.2 million and $18.6 million for the three months ended June 30, 2019 and 2018, respectively, and $35.2 million and $36.8 million for the six months ended June 30, 2019 and 2018, respectively.

4. LEASES

WESCO leases real estate, automobiles, trucks and other equipment. The determination of whether an arrangement is, or contains, a lease is performed at the inception of the arrangement. Classification and initial measurement of the right-of-use asset and lease liability are determined at the lease commencement date. The Company elected the short-term lease measurement and recognition exemption; therefore, leases with an initial term of 12 months or less are not recorded on the balance sheet.

The Company's arrangements include certain non-lease components such as common area and other maintenance for leased real estate, as well as mileage, fuel and maintenance costs related to leased automobiles and trucks. WESCO accounts for these nonlease components separately from the associated lease components. The Company does not guarantee any residual value in its lease agreements, and there are no material restrictions or covenants imposed by lease arrangements. Real estate leases typically include one or more options to extend the lease. The Company regularly evaluates the renewal options, and when they are reasonably certain of exercise, the Company includes the renewal period in its lease term. The Company uses the interest rate implicit in its leases to discount lease payments at the lease commencement date. When the implicit rate is not readily available, the Company uses its incremental borrowing rate.

The Company's finance leases, which are recorded in the Condensed Consolidated Balance Sheet as of June 30, 2019 as a component of property, buildings and equipment, current portion of long-term debt and long-term debt, respectively, are not material to the consolidated financial statements and notes thereto. Accordingly, finance leases have not been disclosed herein.

The following table sets forth supplemental balance sheet information related to operating leases for the period presented:

	As of
(In thousands)	June 30, 2019
Operating lease assets	$	233,403
Current operating lease liabilities	60,294
Noncurrent operating lease liabilities	177,907
Total operating lease liabilities	$	238,201

The following table sets forth the Company's total lease cost, which is recorded as a component of selling, general and administrative expenses, for the periods presented:

	Three Months Ended		Six Months Ended
	June 30		June 30
(In thousands)	2019		2019
Operating lease cost	$	18,285	$	36,274
Short-term lease cost	22		33
Variable lease cost	6,463		11,784
Total lease cost	$	24,770	$	48,091

Variable lease cost consists of the non-lease components described above, as well as taxes and insurance for WESCO's leased real estate.

10

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

The following table sets forth supplemental cash flow information related to operating leases for the period presented:

	Six Months Ended
	June 30
(In thousands)	2019
Operating cash flows from operating leases	$	32,214
Right-of-use assets obtained in exchange for new operating lease liabilities	26,731

As of June 30, 2019, the weighted-average remaining lease term for operating leases was 5.5 years and the weighted-average discount rate used to measure operating lease assets and liabilities was 4.6%.

The following table sets forth the maturities of the Company's operating lease liabilities and reconciles the respective undiscounted payments to the operating lease liabilities in the Condensed Consolidated Balance Sheet as of June 30, 2019:

	(In thousands)
2019	$	36,218
2020	64,614
2021	53,127
2022	39,774
2023	30,201
Thereafter	47,550
Total undiscounted operating lease payments	271,484
Less: interest	(33,283		)
Total operating lease liabilities	$	238,201

The following table sets forth the future minimum rental payments for operating leases accounted for in accordance with Accounting Standards Codification Topic 840, Leases, as of December 31, 2018:

Years ending December 31	(In thousands)
2019	$	71,640
2020	59,594
2021	47,264
2022	34,490
2023	24,493
Thereafter	40,302

5. ACQUISITIONS

The following table sets forth the consideration paid for acquisitions:

	Six Months Ended
	June 30
	2019
	(In thousands)
Fair value of assets acquired	$	36,188
Fair value of liabilities assumed	8,446
Cash paid for acquisitions	$	27,742

11

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

Sylvania Lighting Services Corp.

On March 5, 2019, WESCO Distribution, Inc. ("WESCO Distribution"), through its WESCO Services, LLC subsidiary, acquired certain assets and assumed certain liabilities of Sylvania Lighting Services Corp. ("SLS"). Headquartered in Wilmington, Massachusetts, SLS offers a full spectrum of energy-efficient lighting upgrade, retrofit, and renovation solutions with annual sales of approximately $100 million and approximately 220 employees across the U.S. and Canada. WESCO Distribution funded the purchase price paid at closing with borrowings under its accounts receivable securitization facility. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date, resulting in goodwill of $5.9 million, which is deductible for tax purposes.

6. GOODWILL

The following table sets forth the changes in the carrying value of goodwill:

	Six Months Ended
	June 30
(In thousands)	2019
Beginning balance January 1	$	1,722,603
Foreign currency exchange rate changes	24,251
Additions to goodwill for acquisitions	5,946
Ending balance June 30	$	1,752,800

7. STOCK-BASED COMPENSATION

WESCO’s stock-based employee compensation plans are comprised of 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-settled stock appreciation rights and performance-based awards with market conditions is determined using the Black-Scholes and Monte Carlo simulation models, respectively. 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 employee behavior that is reviewed on an annual basis. No dividends are assumed. For 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-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. Vesting of restricted stock units is based on a minimum time period of three years. 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 and performance-based awards would vest at the target level.

Performance-based awards granted in 2019 were based on two equally-weighted performance measures: the three-year average growth rate of WESCO's net income and the three-year cumulative return on net assets. Performance-based awards granted in 2018 were based on two equally-weighted performance measures: the three-year average growth rate of the Company’s fully diluted earnings per share and the three-year cumulative return on net assets. From 2015 to 2017, the two equally-weighted performance-based award metrics were the three-year average growth rate of WESCO's net income and WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period.

12

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

During the three and six months ended June 30, 2019 and 2018, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:

	Three Months Ended				Six Months Ended
	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
Stock-settled stock appreciation rights granted	—		8,402		213,618		499,631
Weighted-average fair value	$	—	$	17.85	$	16.36	$	18.39
Restricted stock units granted	—		2,502		175,544		116,771
Weighted-average fair value	$	—	$	59.95	$	54.64	$	62.75
Performance-based awards granted	—		—		126,874		44,144
Weighted-average fair value	$	—	$	—	$	54.64	$	62.80

The fair value of stock-settled stock appreciation rights was estimated using the following weighted-average assumptions:

	Three Months Ended			Six Months Ended
	June 30, 2019	June 30, 2018		June 30, 2019		June 30, 2018
Risk free interest rate	n/a	2.8	%	2.5	%	2.5	%
Expected life (in years)	n/a	5		5		5
Expected volatility	n/a	28	%	29	%	28	%

The risk-free interest rate is based on the U.S. Treasury Daily Yield Curve as of the grant date. The expected life is based on historical exercise experience and the expected volatility is based on the volatility of the Company's daily stock prices over a five-year period preceding the grant date.

The following table sets forth a summary of stock-settled stock appreciation rights and related information for the six months ended June 30, 2019:

	Awards		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (In years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2018	2,351,633		$	59.26
Granted	213,618		54.63
Exercised	(106,044	)	34.70
Forfeited	(44,877	)	70.10
Outstanding at June 30, 2019	2,414,330		59.73		6.2	$	6,739
Exercisable at June 30, 2019	1,749,679		$	59.01	5.2	$	6,739

13

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

The following table sets forth a summary of time-based restricted stock units and related information for the six months ended June 30, 2019:

	Awards		Weighted- Average Fair Value
Unvested at December 31, 2018	327,798		$	57.87
Granted	175,544		54.64
Vested	(116,858	)	44.32
Forfeited	(2,937	)	56.16
Unvested at June 30, 2019	383,547		$	60.46

Performance shares are awards for which the vesting will occur based on market or performance conditions. The following table sets forth a summary of performance-based awards for the six months ended June 30, 2019:

	Awards		Weighted- Average Fair Value
Unvested at December 31, 2018	138,896		$	59.33
Granted	126,874		54.64
Vested	(25,696	)	42.44
Forfeited	(35,486	)	50.79
Unvested at June 30, 2019	204,588		$	60.11

The unvested performance-based awards in the table above include 17,507 shares in which vesting of the ultimate number of shares is dependent upon WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period. These awards are accounted for as awards with market conditions; compensation cost is recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest.

Vesting of the remaining 187,081 shares of performance-based awards in the table above is dependent upon the achievement of certain performance targets, including 80,944 that are dependent upon the three-year average growth rate of WESCO's net income, 21,350 that are dependent upon the three-year average growth rate of the Company's fully diluted earnings per share, and 84,787 that are based upon 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.

WESCO recognized $5.2 million and $4.4 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the three months ended June 30, 2019 and 2018, respectively. WESCO recognized $9.8 million and $8.0 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the six months ended June 30, 2019 and 2018, respectively. As of June 30, 2019, there was $31.4 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements for all awards previously made, of which approximately $10.2 million is expected to be recognized over the remainder of 2019, $13.5 million in 2020, $7.0 million in 2021 and $0.7 million in 2022.

8. EARNINGS PER SHARE

Basic earnings per share is computed by dividing net income attributable to WESCO International by the weighted-average number of common shares outstanding during the periods. Diluted earnings per share is computed by dividing net income attributable to WESCO International 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.

14

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

The following table sets forth the details of basic and diluted earnings per share:

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands, except per share data)	2019		2018		2019		2018
Net income attributable to WESCO International	$	63,464	$	57,940	$	105,832	$	102,361
Weighted-average common shares outstanding used in computing basic earnings per share	43,493		47,085		44,280		47,062
Common shares issuable upon exercise of dilutive equity awards	323		465		381		516
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share	43,816		47,550		44,661		47,578
Earnings per share attributable to WESCO International
Basic	$	1.46	$	1.23	$	2.39	$	2.18
Diluted	$	1.45	$	1.22	$	2.37	$	2.15

For the three and six months ended June 30, 2019, the computation of diluted earnings per share attributable to WESCO International excluded stock-based awards of approximately 1.8 million. For the three and six months ended June 30, 2018, the computation of diluted earnings per share attributable to WESCO International excluded stock-based awards of approximately 1.5 million. These amounts were excluded because their effect would have been antidilutive.

In December 2017, the Company's Board of Directors authorized the repurchase of up to $300 million of the Company's common stock through December 31, 2020. In October 2018, the Board approved an increase to this repurchase authorization from $300 million to $400 million.

On May 7, 2019, the Company entered into an accelerated stock repurchase agreement (the "ASR Transaction") with a financial institution to repurchase additional shares of its common stock. In exchange for an up-front cash payment of $150.0 million, the Company received 2,394,816 shares during the three months ended June 30, 2019. As of June 30, 2019, the ASR Transaction had not yet settled between the counterparties. Upon settlement, the Company expects to receive additional shares. WESCO funded the repurchase primarily with borrowings under its accounts receivable securitization facility. For the six months ended June 30, 2019, the Company received a total of 2,760,088 shares, of which 365,272 were received upon the settlement of an accelerated stock repurchase agreement entered into on November 6, 2018.

The total number of shares ultimately delivered under an accelerated stock repurchase transaction is determined by the average of the volume-weighted-average price of the Company's common stock for each exchange business day during the respective settlement valuation periods. For purposes of computing earnings per share for the three and six months ended June 30, 2019, shares repurchases have been reflected as a reduction to common shares outstanding on the respective delivery dates.

9. EMPLOYEE BENEFIT PLANS

A majority of WESCO’s employees are covered by defined contribution retirement savings plans for their services rendered subsequent to WESCO’s formation. WESCO also offers a deferred compensation plan for select individuals. For U.S. participants, WESCO matches contributions made by employees at an amount equal to 50% of participants' total monthly contributions up to a maximum of 6% of eligible compensation. For Canadian participants, WESCO makes contributions in amounts ranging from 3% to 5% of participants' eligible compensation based on years of continuous service. WESCO may also make, subject to the Board of Directors' approval, a discretionary contribution to the defined contribution retirement savings plan covering U.S. participants if certain predetermined profit levels are attained. For the six months ended June 30, 2019 and 2018, WESCO incurred charges of $18.9 million and $21.9 million, respectively, for all such plans. Contributions are made in cash to employee retirement savings plan accounts. The deferred compensation plan is an unfunded plan. As of June 30, 2019 and December 31, 2018, the Company's obligation under the deferred compensation plan was $23.7 million and $21.9 million, respectively. Employees have the option to transfer balances allocated to their accounts in the defined contribution retirement savings plan and the deferred compensation plan into any of the available investment options.

15

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

The Company sponsors a contributory defined benefit plan covering substantially all Canadian employees of EECOL and a Supplemental Executive Retirement Plan (the "SERP") for certain executives of EECOL. During the three and six months ended June 30, 2019, the Company contributed $0.1 million and $0.2 million, respectively, to the SERP.

The following table sets forth the components of net periodic benefit costs for the defined benefit plans:

	Three Months Ended						Six Months Ended
	June 30						June 30
(In thousands)	2019			2018			2019			2018
Service cost	$	1,139		$	1,312		$	2,288		$	2,659
Interest cost	1,080			1,039			2,169			2,105
Expected return on plan assets	(1,410		)	(1,500		)	(2,832		)	(3,040		)
Recognized actuarial gain	(15		)	(12		)	(31		)	(24		)
Net periodic benefit cost	$	794		$	839		$	1,594		$	1,700

The service cost of $1.1 million and $1.3 million for the three months ended June 30, 2019 and 2018, respectively, and $2.3 million and $2.7 million for the six months ended June 30, 2019 and 2018, respectively, was reported as a component of selling, general and administrative expenses. The other components of net periodic benefit cost totaling a net benefit of $0.3 million and $0.5 million for the three months ended June 30, 2019 and 2018, respectively, and $0.7 million and $1.0 million for the six months ended June 30, 2019 and 2018, respectively, were presented as a component of net interest and other.

10. FAIR VALUE OF FINANCIAL INSTRUMENTS

The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable, bank overdrafts, and outstanding indebtedness. 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 reported carrying amounts of WESCO's financial instruments approximated their fair values as of June 30, 2019 and December 31, 2018.

11. 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. 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.

In an effort to expand the Company's footprint in the Middle East, WESCO has been doing business since 2009 with WESTEC Supplies General Trading (“WESTEC”), an industrial equipment supplier headquartered in the United Arab Emirates. WESTEC has a line of credit with a maximum borrowing capacity of approximately $6.8 million to support its working capital requirements and joint sales efforts with WESCO. Due to the nature of WESCO’s arrangement with WESTEC, WESCO has provided a standby letter of credit under its revolving credit facility of up to $7.3 million as security for WESTEC’s line of credit. As of June 30, 2019, WESTEC had an outstanding loan balance of $6.0 million. Management currently believes the estimated fair value of the noncontingent guarantee on the line of credit is nominal and therefore a liability has not been recorded as of June 30, 2019.

12. INCOME TAXES

The effective tax rate for the three and six months ended June 30, 2019 was 21.6% and 21.7%, respectively. The effective tax rate for the three and six months ended June 30, 2018 was 21.5% and 20.7%, respectively. WESCO’s effective tax rate is typically impacted by the tax effect of intercompany financing, foreign tax rate differences, nondeductible expenses and state income taxes. The higher effective tax rate for the six months ended June 30, 2019 was primarily due to the full application of the international provisions of U.S. tax reform. There have been no material adjustments to liabilities for uncertain tax positions since the last annual disclosure for the year ended December 31, 2018.

16

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

13. CONDENSED CONSOLIDATING FINANCIAL INFORMATION

WESCO Distribution has outstanding $500 million in aggregate principal amount of 5.375% Senior Notes due 2021 (the "2021 Notes") and $350 million in aggregate principal amount of 5.375% Senior Notes due 2024 (the "2024 Notes"). The 2021 Notes and 2024 Notes are unsecured senior obligations of WESCO Distribution and are fully and unconditionally guaranteed on a senior unsecured basis by WESCO International.

Condensed consolidating financial information for WESCO International, WESCO Distribution and the non-guarantor subsidiaries is presented in the following tables.

	Condensed Consolidating Balance Sheet
	June 30, 2019
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	—	$	34,401	$	52,817		$	—		$	87,218
Trade accounts receivable, net	—		—		1,355,541			—			1,355,541
Inventories	—		455,898		548,229			—			1,004,127
Prepaid expenses and other current assets	1,123		17,703		121,956			(2,804		)	137,978
Total current assets	1,123		508,002		2,078,543			(2,804		)	2,584,864
Intercompany receivables, net	—		—		2,521,347			(2,521,347		)	—
Property, buildings and equipment, net	—		73,401		98,958			—			172,359
Operating lease assets	—		139,468		93,935			—			233,403
Intangible assets, net	—		1,816		302,576			—			304,392
Goodwill	—		257,623		1,495,177			—			1,752,800
Investments in affiliates	3,336,052		5,276,915		—			(8,612,967		)	—
Other assets	—		2,597		17,521			—			20,118
Total assets	$	3,337,175	$	6,259,822	$	6,608,057		$	(11,137,118	)	$	5,067,936
Accounts payable	$	—	$	418,469	$	450,136		$	—		$	868,605
Short-term debt	—		—		27,217			—			27,217
Other current liabilities	—		66,660		165,154			(2,804		)	229,010
Total current liabilities	—		485,129		642,507			(2,804		)	1,124,832
Intercompany payables, net	1,196,100		1,325,247		—			(2,521,347		)	—
Long-term debt, net	—		892,909		506,577			—			1,399,486
Operating lease liabilities	—		110,360		67,547			—			177,907
Other noncurrent liabilities	—		110,125		120,763			—			230,888
Total WESCO International stockholders' equity	2,141,075		3,336,052		5,276,915			(8,612,967		)	2,141,075
Noncontrolling interests	—		—		(6,252		)	—			(6,252		)
Total liabilities and stockholders’ equity	$	3,337,175	$	6,259,822	$	6,608,057		$	(11,137,118	)	$	5,067,936

17

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

	Condensed Consolidating Balance Sheet
	December 31, 2018
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	—	$	35,931	$	60,412		$	—		$	96,343
Trade accounts receivable, net	—		—		1,166,607			—			1,166,607
Inventories	—		440,422		508,304			—			948,726
Prepaid expenses and other current assets	1,123		57,586		124,523			(9,268		)	173,964
Total current assets	1,123		533,939		1,859,846			(9,268		)	2,385,640
Intercompany receivables, net	—		—		2,403,704			(2,403,704		)	—
Property, buildings and equipment, net	—		63,506		97,372			—			160,878
Intangible assets, net	—		2,131		313,885			—			316,016
Goodwill	—		257,623		1,464,980			—			1,722,603
Investments in affiliates	3,182,469		5,137,783		—			(8,320,252		)	—
Other assets	—		2,905		16,994			—			19,899
Total assets	$	3,183,592	$	5,997,887	$	6,156,781		$	(10,733,224	)	$	4,605,036
Accounts payable	$	—	$	404,373	$	389,975		$	—		$	794,348
Short-term debt	—		—		30,785			—			30,785
Other current liabilities	—		86,600		159,481			(9,268		)	236,813
Total current liabilities	—		490,973		580,241			(9,268		)	1,061,946
Intercompany payables, net	1,048,282		1,355,422		—			(2,403,704		)	—
Long-term debt, net	—		842,093		325,218			—			1,167,311
Other noncurrent liabilities	—		126,930		119,123			—			246,053
Total WESCO International stockholders' equity	2,135,310		3,182,469		5,137,783			(8,320,252		)	2,135,310
Noncontrolling interests	—		—		(5,584		)	—			(5,584		)
Total liabilities and stockholders’ equity	$	3,183,592	$	5,997,887	$	6,156,781		$	(10,733,224	)	$	4,605,036

18

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

	Condensed Consolidating Statement of Income and Comprehensive Income
	Three Months Ended
	June 30, 2019
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	938,333	$	1,255,952		$	(44,197	)	$	2,150,088
Cost of goods sold (excluding depreciation and
amortization)	—		763,036		1,022,275			(44,197		)	1,741,114
Selling, general and administrative expenses	—		146,133		149,709			—			295,842
Depreciation and amortization	—		4,471		10,711			—			15,182
Results of affiliates’ operations	63,215		53,962		—			(117,177		)	—
Net interest and other	—		12,880		4,427			—			17,307
Income tax expense	—		2,560		14,868			—			17,428
Net income	63,215		63,215		53,962			(117,177		)	63,215
Net loss attributable to noncontrolling interests	—		—		(249		)	—			(249		)
Net income attributable to WESCO International	$	63,215	$	63,215	$	54,211		$	(117,177	)	$	63,464
Other comprehensive income:
Foreign currency translation adjustments	20,244		20,244		20,244			(40,488		)	20,244
Comprehensive income attributable to WESCO International	$	83,459	$	83,459	$	74,455		$	(157,665	)	$	83,708

	Condensed Consolidating Statement of Income and Comprehensive Income
	Six Months Ended
	June 30, 2019
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	1,796,315	$	2,398,346		$	(83,306	)	$	4,111,355
Cost of goods sold (excluding depreciation and
amortization)	—		1,452,592		1,950,600			(83,306		)	3,319,886
Selling, general and administrative expenses	—		298,562		293,808			—			592,370
Depreciation and amortization	—		9,027		21,397			—			30,424
Results of affiliates’ operations	105,164		96,375		—			(201,539		)	—
Net interest and other	—		24,914		9,513			—			34,427
Income tax expense	—		2,431		26,653			—			29,084
Net income	105,164		105,164		96,375			(201,539		)	105,164
Net loss attributable to noncontrolling interests	—		—		(668		)	—			(668		)
Net income attributable to WESCO International	$	105,164	$	105,164	$	97,043		$	(201,539	)	$	105,832
Other comprehensive income:
Foreign currency translation adjustments	42,763		42,763		42,763			(85,526		)	42,763
Comprehensive income attributable to WESCO International	$	147,927	$	147,927	$	139,806		$	(287,065	)	$	148,595

19

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

	Condensed Consolidating Statement of Income and Comprehensive Income
	Three Months Ended
	June 30, 2018
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	921,075		$	1,222,369		$	(39,450	)	$	2,103,994
Cost of goods sold (excluding depreciation and
amortization)	—			746,373			997,177			(39,450		)	1,704,100
Selling, general and administrative expenses	—			147,566			145,322			—			292,888
Depreciation and amortization	—			4,656			11,167			—			15,823
Results of affiliates’ operations	57,673			51,122			—			(108,795		)	—
Net interest and other	—			14,259			3,482			—			17,741
Income tax expense	—			1,670			14,099			—			15,769
Net income	57,673			57,673			51,122			(108,795		)	57,673
Net loss attributable to noncontrolling interests	—			—			(267		)	—			(267		)
Net income attributable to WESCO International	$	57,673		$	57,673		$	51,389		$	(108,795	)	$	57,940
Other comprehensive loss:
Foreign currency translation adjustments	(28,715		)	(28,715		)	(28,715		)	57,430			(28,715		)
Comprehensive income attributable to WESCO International	$	28,958		$	28,958		$	22,674		$	(51,365	)	$	29,225

	Condensed Consolidating Statement of Income and Comprehensive Income
	Six Months Ended
	June 30, 2018
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	1,803,474		$	2,372,479		$	(78,044	)	$	4,097,909
Cost of goods sold (excluding depreciation and
amortization)	—			1,462,631			1,933,479			(78,044		)	3,318,066
Selling, general and administrative expenses	—			298,047			285,670			—			583,717
Depreciation and amortization	—			9,275			22,428			—			31,703
Results of affiliates’ operations	100,644			96,325			—			(196,969		)	—
Net interest and other	—			28,076			9,448			—			37,524
Income tax expense	—			1,126			25,129			—			26,255
Net income	100,644			100,644			96,325			(196,969		)	100,644
Net loss attributable to noncontrolling interests	—			—			(1,717		)	—			(1,717		)
Net income attributable to WESCO International	$	100,644		$	100,644		$	98,042		$	(196,969	)	$	102,361
Other comprehensive loss:
Foreign currency translation adjustments	(57,515		)	(57,515		)	(57,515		)	115,030			(57,515		)
Comprehensive income attributable to WESCO International	$	43,129		$	43,129		$	40,527		$	(81,939	)	$	44,846

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

	Condensed Consolidating Statement of Cash Flows
	Six Months Ended
	June 30, 2019
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash provided by (used in) operating activities	$	4,904		$	128,070		$	(141,749	)	$	—		$	(8,775	)
Investing activities:
Capital expenditures	—			(5,843		)	(15,559		)	—			(21,402		)
Acquisition payments	—			(27,742		)	—			—			(27,742		)
Dividends received from subsidiaries	—			44,417			—			(44,417		)	—
Other	—			(192,235		)	(1,155		)	192,235			(1,155		)
Net cash used in investing activities	—			(181,403		)	(16,714		)	147,818			(50,299		)
Financing activities:
Borrowings	147,818			242,134			720,657			(192,235		)	918,374
Repayments	—			(193,134		)	(525,306		)	—			(718,440		)
Repurchases of common stock	(152,722		)	—			—			—			(152,722		)
Dividends paid by subsidiaries	—			—			(44,417		)	44,417			—
Other	—			2,803			—			—			2,803
Net cash (used in) provided by financing activities	(4,904		)	51,803			150,934			(147,818		)	50,015
Effect of exchange rate changes on cash and cash equivalents	—			—			(66		)	—			(66		)
Net change in cash and cash equivalents	—			(1,530		)	(7,595		)	—			(9,125		)
Cash and cash equivalents at the beginning of period	—			35,931			60,412			—			96,343
Cash and cash equivalents at the end of period	$	—		$	34,401		$	52,817		$	—		$	87,218

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(CONTINUED)

(unaudited)

	Condensed Consolidating Statement of Cash Flows
	Six Months Ended
	June 30, 2018
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash provided by operating activities	$	9,878		$	31,192		$	45,751		$	—		$	86,821
Investing activities:
Capital expenditures	—			(9,334		)	(7,050		)	—			(16,384		)
Dividends received from subsidiaries	—			95,511			—			(95,511		)	—
Other	—			(37,524		)	(8,684		)	37,524			(8,684		)
Net cash provided by (used in) investing activities	—			48,653			(15,734		)	(57,987		)	(25,068		)
Financing activities:
Borrowings	—			191,888			736,372			(45,511		)	882,749
Repayments	(7,987		)	(260,888		)	(673,761		)	7,987			(934,649		)
Repurchases of common stock	(1,891		)	—			—			—			(1,891		)
Dividends paid by subsidiaries	—			—			(95,511		)	95,511			—
Other	—			(9,958		)	—			—			(9,958		)
Net cash used in financing activities	(9,878		)	(78,958		)	(32,900		)	57,987			(63,749		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(5,017		)	—			(5,017		)
Net change in cash and cash equivalents	—			887			(7,900		)	—			(7,013		)
Cash and cash equivalents at the beginning of period	—			50,602			67,351			—			117,953
Cash and cash equivalents at the end of period	$	—		$	51,489		$	59,451		$	—		$	110,940

14. SUBSEQUENT EVENTS

The Company evaluated subsequent events and concluded that no subsequent events have occurred that would require recognition in the unaudited Condensed Consolidated Financial Statements or disclosure in the Notes thereto.

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

Item 2.    Management's Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion should be read in conjunction with the information in the unaudited condensed consolidated financial statements and notes thereto included herein and WESCO International, Inc.’s audited Consolidated Financial Statements and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in its 2018 Annual Report on Form 10-K. The matters discussed herein may contain forward-looking statements that are subject to certain risks and uncertainties that could cause actual results to differ materially from expectations. Certain of these risks are set forth in WESCO International, Inc.'s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, as well as WESCO International, Inc.’s other reports filed with the Securities and Exchange Commission.

Company Overview

WESCO International, Inc. (“WESCO International”), incorporated in 1993 and effectively formed in February 1994 upon acquiring a distribution business from Westinghouse Electric Corporation, is a leading North American-based distributor of products and provider of advanced supply chain management and logistics services used primarily in industrial, construction, utility, and commercial, institutional and government (“CIG”) markets. We are a leading provider of electrical, industrial, and communications maintenance, repair and operating ("MRO") and original equipment manufacturer ("OEM") products, construction materials, and advanced supply chain management and logistics services. Our primary product categories include general supplies, wire, cable and conduit, communications and security, electrical distribution and controls, lighting and sustainability, and automation, controls and motors.

We serve approximately 70,000 active customers globally through approximately 500 branches primarily located in North America, with operations in 15 additional countries and 10 distribution centers located in the United States and Canada. We employ approximately 9,300 employees worldwide. We distribute over 1,000,000 products, grouped into six categories, from approximately 30,000 suppliers, utilizing a highly automated, proprietary electronic procurement and inventory replenishment system.

In addition, we offer a comprehensive portfolio of value-added capabilities, which includes supply chain management, logistics and transportation, procurement, warehousing and inventory management, as well as kitting, limited assembly of products and system installation. Our value-added capabilities, extensive geographic reach, experienced workforce and broad product and supply chain solutions have enabled us to grow our business and establish a leading position in North America.

Our financial results for the first six months of 2019 reflect sales growth and a continued positive impact from our margin improvement initiatives. Net sales increased $13.4 million, or 0.3%, over the same period last year. Cost of goods sold as a percentage of net sales was 80.7% and 81.0% for the first six months of 2019 and 2018, respectively. Selling, general and administrative ("SG&A") expenses as a percentage of net sales were 14.4% and 14.2% for the first six months of 2019 and 2018, respectively. Operating profit was $168.7 million for the current six month period, compared to $164.4 million for the first six months of 2018. Operating profit increased primarily due to higher sales volume. Net income attributable to WESCO International for the six months ended June 30, 2019 and 2018 was $105.8 million and $102.4 million, respectively.

Cash Flow

Cash flow used in operations was $8.8 million for the first six months of 2019. Investing activities included payments of $27.7 million to acquire Sylvania Lighting Solutions ("SLS") and $21.4 million of capital expenditures. Financing activities were comprised of borrowings and repayments of $473.5 million and $464.3 million, respectively, related to our revolving credit facility (the "Revolving Credit Facility"), borrowings and repayments of $410.0 million and $190.0 million, respectively, related to our accounts receivable securitization facility (the “Receivables Facility”) and repayments of $24.8 million to pay off our term loan facility (the "Term Loan Facility"). Financing activities for the first six months of 2019 also included borrowings and repayments on our various international lines of credit of approximately $34.9 million and $39.4 million, respectively. Additionally, financing activities for the first six months of 2019 included the repurchase of $150.0 million of the Company's common stock pursuant to an accelerated stock repurchase transaction under the share repurchase plan announced on December 13, 2017 and amended on October 31, 2018.

Financing Availability

As of June 30, 2019, we had $504.8 million in total available borrowing capacity under our Revolving Credit Facility, which was comprised of $355.8 million of availability under the U.S. sub-facility and $149.0 million of availability under the Canadian sub-facility. Available borrowing capacity under our Receivables Facility was $55.0 million. The Revolving Credit Facility and the Receivables Facility both mature in September 2020.

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

Critical Accounting Policies and Estimates

Effective January 1, 2019, we adopted Accounting Standards Update (ASU) 2016-02, Leases, and all the related amendments. See Note 2 of our Notes to the unaudited Condensed Consolidated Financial Statements for information regarding our significant accounting policies.

Results of Operations

Second Quarter of 2019 versus Second Quarter of 2018

The following table sets forth the percentage relationship to net sales of certain items in our Condensed Consolidated Statements of Income and Comprehensive Income for the periods presented:

	Three Months Ended
	June 30
	2019		2018
Net sales	100.0	%	100.0	%
Cost of goods sold (excluding depreciation and amortization)	81.0		81.0
Selling, general and administrative expenses	13.8		13.9
Depreciation and amortization	0.6		0.8
Income from operations	4.6		4.3
Net interest and other	0.8		0.8
Income before income taxes	3.8		3.5
Provision for income taxes	0.8		0.7
Net income attributable to WESCO International	3.0	%	2.8	%

Net sales were $2.2 billion for the second quarter of 2019, compared to $2.1 billion for the second quarter of 2018, an increase of 2.2%. Organic sales for the second quarter of 2019 grew by 1.9% as foreign exchange rates negatively impacted net sales by 1.0%, while acquisitions positively impacted net sales by 1.3%.

The following table sets forth organic sales growth for the period presented:

	Three Months Ended
	June 30, 2019
Change in net sales	2.2	%
Impact from acquisitions	1.3	%
Impact from foreign exchange rates	(1.0	)%
Impact from number of workdays	—	%
Organic sales growth	1.9	%

Note: Organic sales growth is a non-GAAP financial measure of sales performance. Organic sales growth is calculated by deducting the percentage impact from acquisitions in the first year of ownership, foreign exchange rates and number of workdays from the overall percentage change in consolidated net sales.

Cost of goods sold for the second quarter of 2019 and 2018 was $1.7 billion. As a percentage of net sales, cost of goods sold was 81.0% for both periods. Cost of goods sold as a percentage of net sales for the second quarter of 2019 reflects the positive impact from the SLS acquisition offset by business mix.

SG&A expenses for the second quarter of 2019 totaled $295.8 million versus $292.9 million for the second quarter of 2018. As a percentage of net sales, SG&A expenses were 13.8% and 13.9%, respectively. The increase in SG&A expenses was primarily due to the impact of the SLS acquisition, partially offset by the absence of a bad debt charge that was recorded in the prior year's second quarter.

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

SG&A payroll expenses for the second quarter of 2019 of $203.7 million increased by $1.6 million compared to the same period in 2018 primarily due to wage inflation and the impact of the SLS acquisition, partially offset by lower variable compensation expense and benefit costs.

Depreciation and amortization for the second quarter of 2019 and 2018 was $15.2 million and $15.8 million, respectively.

Net interest and other totaled $17.3 million for the second quarter of 2019 compared to $17.7 million for the second quarter of 2018.

Income tax expense totaled $17.4 million for the second quarter of 2019 compared to $15.8 million in last year's comparable period, and the effective tax rate was 21.6% and 21.5%, respectively.

Net income for the second quarter of 2019 was $63.2 million, compared to net income of $57.7 million for the second quarter of 2018.

Net loss of $0.3 million was attributable to noncontrolling interests for the second quarter of 2019 and 2018.

Net income and diluted earnings per share attributable to WESCO International were $63.5 million and $1.45 per share, respectively, for the second quarter of 2019, compared with net income and diluted earnings per share of $57.9 million and $1.22 per share, respectively, for the second quarter of 2018.

Six Months Ended June 30, 2019 versus Six Months Ended June 30, 2018

The following table sets forth the percentage relationship to net sales of certain items in our Condensed Consolidated Statements of Income and Comprehensive Income for the periods presented:

	Six Months Ended
	June 30
	2019		2018
Net sales	100.0	%	100.0	%
Cost of goods sold (excluding depreciation and amortization)	80.7		81.0
Selling, general and administrative expenses	14.4		14.2
Depreciation and amortization	0.8		0.8
Income from operations	4.1		4.0
Net interest and other	0.8		0.9
Income before income taxes	3.3		3.1
Provision for income taxes	0.7		0.6
Net income attributable to WESCO International	2.6	%	2.5	%

Net sales were $4.1 billion for the first six months of 2019 and 2018. Organic sales for the first six months of 2019 grew by 1.5% as foreign exchange rates and the number of workdays negatively impacted net sales by 1.2% and 0.8%, respectively, while acquisitions positively impacted net sales by 0.8%.

The following table sets forth organic sales growth for the period presented:

	Six Months Ended
	June 30, 2019
Change in net sales	0.3	%
Impact from acquisitions	0.8	%
Impact from foreign exchange rates	(1.2	)%
Impact from number of workdays	(0.8	)%
Organic sales growth	1.5	%

Note: Organic sales growth is a non-GAAP financial measure of sales performance. Organic sales growth is calculated by deducting the percentage impact from acquisitions in the first year of ownership, foreign exchange rates and number of workdays from the overall percentage change in consolidated net sales.

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

Cost of goods sold for the first six months of 2019 and 2018 was $3.3 billion. As a percentage of net sales, cost of goods sold was 80.7% and 81.0%, respectively. The decrease in cost of goods sold as a percentage of net sales was primarily due to the continued positive impact from our margin improvement initiatives.

SG&A expenses for the first six months of 2019 totaled $592.4 million versus $583.7 million for the first six months of 2018. As a percentage of net sales, SG&A expenses were 14.4% and 14.2%, respectively. The increase in SG&A expenses was primarily due to the impact of the SLS acquisition, partially offset by the absence of a bad debt charge that was recorded in the prior year's second quarter.

SG&A payroll expenses for the first six months of 2019 of $410.3 million increased by $6.4 million compared to the same period in 2018 primarily due to primarily due to wage inflation and the impact of the SLS acquisition, partially offset by lower variable compensation expense and benefit costs.

Depreciation and amortization for the first six months of 2019 and 2018 was $30.4 million and $31.7 million, respectively.

Net interest and other totaled $34.4 million for the first six months of 2019 compared to $37.5 million for the first six months of 2018. For the six months ended June 30, 2018, net interest and other includes a foreign exchange loss of $2.6 million from the remeasurement of financial instruments, as well as accelerated amortization of debt discount and debt issuance costs totaling $0.8 million due to early repayments on our then outstanding term loan facility.

Income tax expense totaled $29.1 million for the first six months of 2019 compared to $26.3 million in last year's comparable period, and the effective tax rate was 21.7% and 20.7%, respectively. The higher effective tax rate in the current year is primarily due to the full application of the international provisions of U.S. tax reform.

Net income for the first six months of 2019 was $105.2 million, compared to net income of $100.6 million for the first six months of 2018.

Net loss of $0.7 million and $1.7 million was attributable to noncontrolling interests for the first six months of 2019 and 2018, respectively.

Net income and diluted earnings per share attributable to WESCO International were $105.8 million and $2.37 per share, respectively, for the first six months of 2019, compared with net income and diluted earnings per share of $102.4 million and $2.15 per share, respectively, for the first six months of 2018.

Liquidity and Capital Resources

Total assets were $5.1 billion and $4.6 billion at June 30, 2019 and December 31, 2018, respectively. Total liabilities were $2.9 billion and $2.5 billion at June 30, 2019 and December 31, 2018, respectively. Total stockholders' equity was $2.1 billion at June 30, 2019 and December 31, 2018.

Our liquidity needs generally arise from fluctuations in our working capital requirements, capital expenditures, acquisitions and debt service obligations. As of June 30, 2019, we had $504.8 million in available borrowing capacity under our Revolving Credit Facility and $55.0 million in available borrowing capacity under our Receivables Facility, which combined with available cash of $26.9 million, provided liquidity of $586.7 million. Cash included in our determination of liquidity represents cash in deposit and interest bearing investment accounts. We believe cash provided by operations and financing activities will be adequate to cover our current operational and business needs. In addition, we regularly review our mix of fixed versus variable rate debt, and we may, from time to time, issue or retire borrowings and/or refinance existing debt in an effort to mitigate the impact of interest rate and foreign exchange rate fluctuations, and to maintain a cost-effective capital structure consistent with our anticipated capital requirements. At June 30, 2019, approximately 59% of our debt portfolio was comprised of fixed rate debt.

We monitor the depository institutions that hold our cash and cash equivalents on a regular basis, and we believe that we have placed our deposits with creditworthy financial institutions. We also communicate on a regular basis with our lenders regarding our financial and working capital performance, liquidity position and financial leverage. Our financial leverage ratio was 3.4 as of June 30, 2019 and 3.0 as of December 31, 2018. In addition, we are in compliance with all covenants and restrictions contained in our debt agreements as of June 30, 2019.

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

The following table sets forth our financial leverage ratio as of June 30, 2019 and December 31, 2018:

	Twelve months ended
(In millions of dollars, except ratio)	June 30, 2019		December 31, 2018
Income from operations	$	356.7	$	352.5
Depreciation and amortization	61.7		63.0
EBITDA	$	418.4	$	415.5
	June 30, 2019		December 31, 2018
Short-term borrowings and current debt	$	27.6	$	56.2
Long-term debt	1,399.5		1,167.3
Debt discount and debt issuance costs (1)	7.8		9.6
Total debt	1,434.9		1,233.1
Less: cash and cash equivalents	87.2		96.3
Total debt, net of cash	$	1,347.7	$	1,136.8
Financial leverage ratio	3.4		3.0
Financial leverage ratio, net of cash	3.2		2.7

⁽¹⁾  Long-term debt is presented in the condensed consolidated balance sheets net of debt discount and debt issuance costs.

Note: Financial leverage is a non-GAAP measure of the use of debt. Financial leverage ratio is calculated by dividing total debt, including debt discount and debt issuance costs, by EBITDA. Financial leverage ratio, net of cash is calculated by dividing total debt, including debt discount and debt issuance costs, net of cash, by EBITDA. EBITDA, which is also a non-GAAP financial measure, is defined as the trailing twelve months earnings before interest, taxes, depreciation and amortization.

At June 30, 2019, we had cash and cash equivalents totaling $87.2 million, of which $62.2 million was held by foreign subsidiaries. As a result of the Tax Cuts and Jobs Act of 2017 (the "TCJA"), we reevaluated our intent and ability to repatriate foreign earnings based upon the liquidity of our domestic operations and the cash flow needs of our foreign subsidiaries. Consequently, during the year ended December 31, 2018, we repatriated a portion of the previously taxed earnings attributable to our Canadian operations. We continue to assert that the remaining undistributed earnings of our foreign subsidiaries, the majority of which were subject to the one-time tax imposed by the TCJA, are indefinitely reinvested. We believe that we are able to maintain a sufficient level of liquidity for our domestic operations and commitments without repatriating cash held by these foreign subsidiaries. Upon any future repatriation, additional income taxes may be incurred; however, it is not practicable to determine the amount at this time.

We did not note any triggering events or substantive changes during the first six months of 2019 that would require an interim evaluation of impairment of goodwill or indefinite-lived intangible assets. We will perform our annual impairment testing of goodwill and indefinite-lived intangible assets during the fourth quarter.

Over the next several quarters, we plan to closely manage working capital, and it is expected that excess cash will be directed primarily at growth initiatives, acquisitions, debt reduction, and share repurchases. We remain focused on maintaining ample liquidity and credit availability. We anticipate capital expenditures in 2019 to be similar to 2018. We believe our balance sheet and ability to generate ample cash flow provides us with a durable business model and should allow us to fund growth initiatives and expansion needs.

Cash Flow

Operating Activities. Net cash used in operating activities for the first six months of 2019 totaled $8.8 million, compared with $86.8 million of cash generated for the first six months of 2018. Operating activities included net income of $105.2 million and adjustments to net income totaling $44.4 million. Primary uses of cash in the first six months of 2019 included: an increase in trade accounts receivable of $157.4 million resulting from higher sales in the latter part of the quarter; a decrease in accrued payroll and benefit costs of $43.7 million resulting from the payment of management incentive compensation earned in 2018; an increase in inventories of $39.7 million primarily to support growth in our business; an increase in prepaid expenses and other assets of $7.7 million; and, a decrease in other current and noncurrent liabilities of $4.5 million. Sources of cash in the first six months of

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

2019 included an increase in accounts payable of $62.4 million, and a decrease in other accounts receivable of $32.2 million due primarily to the collection of supplier volume rebates earned in 2018.

Net cash provided by operating activities for the first six months of 2018 totaled $86.8 million, which included net income of $100.6 million and adjustments to net income totaling $48.8 million. Other sources of cash in 2018 included a decrease in other accounts receivable of $38.4 million due primarily to the collection of supplier volume rebates earned in 2017, an increase in accounts payable of $26.1 million, and a decrease in inventories of $11.4 million. Primary uses of cash in the first six months of 2018 included: an increase in trade accounts receivable of $102.6 million resulting from higher sales; a decrease in accrued payroll and benefit costs of $16.6 million resulting from the payment of management incentive compensation earned in 2017; an increase in prepaid expenses and other assets of $12.9 million; and, decrease in other current and noncurrent liabilities of $6.4 million.

Investing Activities. Net cash used in investing activities for the first six months of 2019 was $50.3 million, compared with $25.1 million used during the first six months of 2018. Included in the first six months of 2019 were acquisition payments of $27.7 million. Capital expenditures were $21.4 million for the six month period ended June 30, 2019, compared to $16.4 million for the six month period ended June 30, 2018. The first six months of 2018 also included other payments of $8.8 million for the purchase of a foreign financial instrument.

Financing Activities. Net cash provided by financing activities for the first six months of 2019 was $50.0 million, compared to $63.7 million used in the first six months of 2018. During the first six months of 2019, financing activities consisted of borrowings and repayments of $473.5 million and $464.3 million, respectively, related to our Revolving Credit Facility, borrowings and repayments of $410.0 million and $190.0 million, respectively, related to our Receivables Facility and repayments of $24.8 million to pay off our Term Loan Facility. Financing activities for the first six months of 2019 also included borrowings and repayments on our various international lines of credit of approximately $34.9 million and $39.4 million, respectively. Additionally, financing activities for the first six months of 2019 included the repurchase of $152.7 million of the Company's common stock, of which $150.0 million was pursuant to an accelerated stock repurchase transaction under the share repurchase plan announced on December 13, 2017 and amended on October 31, 2018.

During the first six months of 2018, financing activities consisted of borrowings and repayments of $449.9 million and $458.9 million, respectively, related to our Revolving Credit Facility, borrowings and repayments of $345.0 million and $330.0 million, respectively, related to our Receivables Facility, and repayments of $60.0 million applied to our Term Loan Facility. Financing activities for the first six months of 2018 also included borrowings and repayments on our various international lines of credit of approximately $87.9 million and $85.8 million, respectively.

Contractual Cash Obligations and Other Commercial Commitments

There were no material changes in our contractual obligations and other commercial commitments that would require an update to the disclosure provided in our 2018 Annual Report on Form 10-K. Management believes that cash generated from operations, together with amounts available under our Revolving Credit Facility and the Receivables Facility, will be sufficient to meet our working capital, capital expenditures and other cash requirements for the foreseeable future. However, there can be no assurances that this will continue to be the case.

Inflation

The rate of inflation, as measured by changes in the producer price index, affects different commodities, the cost of products purchased and ultimately the pricing of our different products and product classes to our customers. For the six months ended June 30, 2019, pricing related to inflation impacted our sales by approximately 2%.

Seasonality

Our operating results are not significantly affected by seasonal factors. Sales during the first quarter are usually affected by a reduced level of activity. Sales during the second, third and fourth quarters are generally 6 to 8% higher than the first quarter. Sales typically increase beginning in March, with slight fluctuations per month through October. During periods of economic expansion or contraction, our sales by quarter have varied significantly from this pattern.

Impact of Recently Issued Accounting Standards

See Note 2 of our Notes to Condensed Consolidated Financial Statements for information regarding the effect of new accounting pronouncements.

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WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

Forward-Looking Statements

From time to time in this report and in other written reports and oral statements, references are made to expectations regarding our future performance. When used in this context, the words “anticipates,” “plans,” “believes,” “estimates,” “intends,” “expects,” “projects,” “will” and similar expressions may identify forward-looking statements, although not all forward-looking statements contain such words. Such statements including, but not limited to, our statements regarding business strategy, growth strategy, competitive strengths, productivity and profitability enhancement, competition, new product and service introductions and liquidity and capital resources are based on management’s beliefs, as well as on assumptions made by and information currently available to management, and involve various risks and uncertainties, some of which are beyond our control. Our actual results could differ materially from those expressed in any forward-looking statement made by us or on our behalf. In light of these risks and uncertainties, there can be no assurance that the forward-looking information will in fact prove to be accurate. Certain of these risks are set forth in the WESCO International’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, as well as WESCO International’s other reports filed with the Securities and Exchange Commission. We have undertaken no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Item 3.    Quantitative and Qualitative Disclosures about Market Risks.

There have not been any material changes to our exposures to market risk during the quarterly period ended June 30, 2019 that would require an update to the relevant disclosures provided in our 2018 Annual Report on Form 10-K.

Item 4.    Controls and Procedures.

Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of our disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)). Based on this evaluation, our principal executive officer and our principal financial officer concluded that our disclosure controls and procedures and internal control over financial reporting were effective as of the end of the period covered by this report.

Effective January 1, 2019, we adopted ASU 2016-02, Leases, and all the related amendments. In connection with the adoption of this new lease standard, we modified certain processes and implemented internal controls related to leases. Except for the effect of adopting the new lease standard, there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

29

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

From time to time, a number of lawsuits and claims have been or may be asserted against us relating to the conduct of our business, including litigation relating to commercial, product and employment matters. The outcome of any litigation cannot be predicted with certainty, and some lawsuits may be determined adversely to us. However, management does not believe that the ultimate outcome of any such pending matters is likely to have a material adverse effect on our 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 our results of operations for that period.

Item 1A. Risk Factors.

There have been no material changes to the risk factors previously disclosed in Item 1A. to Part 1 of WESCO’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

The following table sets forth all issuer purchases of common stock during the three months ended June 30, 2019, including those made pursuant to publicly announced plans or programs:

Period	Total Number of Shares Purchased (2)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)	Approximate Dollar Value of Shares That May Yet be Purchased Under the Plans or Programs (2) (3)
					(In Millions)
April 1 – April 30, 2019	939	$	55.97	—	$	275.0
May 1 – May 31, 2019	2,395,036	$	53.24	2,394,816	$	125.0
June 1 – June 30, 2019	1,889	$	49.67	—	$	125.0
Total	2,397,864	$	53.24	2,394,816

⁽¹⁾  There were 3,048 shares purchased in the period that were not part of the publicly announced share repurchase program. These shares were surrendered by stock-based compensation plan participants to satisfy tax withholding obligations arising from the exercise of stock-settled stock appreciation rights and vesting of restricted stock units.

⁽²⁾  On December 13, 2017, WESCO announced that its Board of Directors approved, on December 7, 2017, the repurchase of up to $300 million of the Company's common stock through December 31, 2020. On October 31, 2018, the Company's Board of Directors approved an increase to the authorization from $300 million to $400 million.

⁽³⁾  This amount represents the remaining authorization under the Company's share repurchase program that is available to repurchase shares of the Company's common stock. Due to the nature of accelerated share repurchases, the Company receives a certain percentage of shares immediately upon an up-front payment of cash. The remaining shares are delivered by the respective counterparty at the end of the valuation period. The amount authorized under the Company’s share repurchase program was reduced at the time of the up-front cash payment.

30

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

Item 6.    Exhibits.

(a)Exhibits

(31)    Rule 13a-14(a)/15d-14(a) Certifications

(1) Certification of Chief Executive Officer pursuant to Rules 13a-14(a) promulgated under the Exchange Act.

(2) Certification of Chief Financial Officer pursuant to Rules 13a-14(a) promulgated under the Exchange Act.

(32)    Section 1350 Certifications

(1) Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

(2) Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101.INS    XBRL Instance Document.

101.SCH    XBRL Taxonomy Extension Schema Document.

101.CAL    XBRL Taxonomy Extension Calculation Linkbase Document.

101.DEF    XBRL Taxonomy Extension Definition Linkbase Document.

101.LAB    XBRL Taxonomy Extension Label Linkbase Document.

101.PRE    XBRL Taxonomy Extension Presentation Linkbase Document.

31

WESCO INTERNATIONAL, INC. AND SUBSIDIARIES

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

WESCO International, Inc.

(Registrant)

August 2, 2019	By:	/s/ David S. Schulz
(Date)		David S. Schulz
		Senior Vice President and Chief Financial Officer

32

EX-31.1

Exhibit 31.1

CERTIFICATION

     I, John J. Engel, certify that:

     1.      I have reviewed this quarterly report on Form 10-Q of WESCO International, Inc.;

     2.     Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

     3.     Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

     4.      The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

    (a)      Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

    (b)      Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

    (c)      Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

    (d)      Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

     5.      The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

    (a)      All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	August 2, 2019	By:	/s/ John J. Engel
			John J. Engel
			Chairman, President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

     I, David S. Schulz, certify that:

     1.      I have reviewed this quarterly report on Form 10-Q of WESCO International, Inc.;

     2.     Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

     3.     Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

     4.      The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

    (a)      Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

    (b)      Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

    (c)      Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

    (d)      Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

     5.      The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

    (a)      All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

    (b)      Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	August 2, 2019	By:	/s/ David S. Schulz
			David S. Schulz
			Senior Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of WESCO International, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, in the capacity and on the date indicated below, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company.

August 2, 2019	By:	/s/ John J. Engel
		John J. Engel
		Chairman, President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of WESCO International, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, in the capacity and on the date indicated below, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operation of the Company.

August 2, 2019	By:	/s/ David S. Schulz
		David S. Schulz
		Senior Vice President and Chief Financial Officer

XML

COVER PAGE Document - shares	6 Months Ended
	Jun. 30, 2019	Aug. 01, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
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
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	WCC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
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 Common Stock, Shares Outstanding		42,478,200
Entity Registrant Name	WESCO INTERNATIONAL INC.
Entity Central Index Key	0000929008
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false

XML

CONSOLIDATED BALANCE SHEETS $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Depreciation, Depletion and Amortization, Nonproduction	$ 15,182	$ 30,424
Other Accrued Liabilities, Current	152,712	152,712	$ 105,461
Current Assets:
Cash and cash equivalents	87,218	87,218	96,343
Allowance for Doubtful Accounts Receivable, Current	25,821	25,821	24,468
Trade accounts receivable, net of allowance for doubtful accounts of $23,069 and $19,309 in 2014 and 2013, respectively	1,355,541	1,355,541	1,166,607
Accounts and Other Receivables, Net, Current	65,694	65,694	96,984
Inventories, net	1,004,127	1,004,127	948,726
Prepaid expenses and other current assets	72,284	72,284	76,980
Total current assets	2,584,864	2,584,864	2,385,640
Property, buildings and equipment, net of accumulated depreciation of $229,041 and $213,758 in 2014 and 2013, respectively	172,359	172,359	160,878
Operating Lease, Right-of-Use Asset	233,403	233,403	0
Intangible assets, net	304,392	304,392	316,016
Goodwill	1,752,800	1,752,800	1,722,603
Other assets	20,118	20,118	19,899
Total assets	5,067,936	5,067,936	4,605,036
Current Liabilities:
Accounts payable	868,605	868,605	794,348
Accrued payroll and benefit costs	43,409	43,409	88,105
Short-term debt	27,217	27,217	30,785
Current portion of long-term debt	396	396	25,429
Total current liabilities	1,124,832	1,124,832	1,061,946
Long-term Debt, Excluding Current Maturities	1,399,486	1,399,486	1,167,311
Operating Lease, Liability, Noncurrent	177,907	177,907	0
Other noncurrent liabilities	83,582	83,582	102,086
Deferred Tax Liabilities, Net, Noncurrent	147,306	147,306	143,967
Total liabilities	2,933,113	2,933,113	2,475,310
Commitments and Contingencies
Bank Overdrafts	32,493	32,493	17,818
Stockholders' Equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	0	0	0
Additional capital	998,218	998,218	993,666
Retained earnings	2,412,768	2,412,768	2,307,462
Treasury stock, at cost; 18,247,467 and 18,179,275 shares in 2014 and 2013, respectively	(904,873)	(904,873)	(758,018)
Accumulated other comprehensive income	(365,674)	(365,674)	(408,435)
Total WESCO International stockholders' equity	2,134,823	2,134,823	2,129,726
Noncontrolling interest	(6,252)	(6,252)	(5,584)
Total stockholders' equity	2,141,075	2,141,075	2,135,310
Total liabilities and stockholders' equity	5,067,936	5,067,936	4,605,036
Common Stock [Member]
Stockholders' Equity:
Common stock	593	593	592
Common Class B [Member]
Stockholders' Equity:
Common stock	$ 43	$ 43	$ 43

XML

CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 25,821,000	$ 24,468,000
Accumulated depreciation	293,076,000	291,811,000
Finite-Lived Intangible Assets, Accumulated Amortization	271,598	249,539
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 7,773,000	$ 9,243,000
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 issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury stock, shares (in shares)	21,154,343	18,391,042
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)	59,292,704	59,157,696
Common stock, shares outstanding (in shares)	42,477,792	45,106,085
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

XML

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues	$ 2,150,088	$ 2,103,994	$ 4,111,355	$ 4,097,909
Cost of goods sold	1,741,114	1,704,100	3,319,886	3,318,066
Selling, general and administrative expense	295,842	292,888	592,370	583,717
Depreciation and amortization	15,182	15,823	30,424	31,703
Income from operations	97,950	91,183	168,675	164,423
Nonoperating Income (Expense)	17,307	17,741	34,427	37,524
Income before income taxes	80,643	73,442	134,248	126,899
Provision for income taxes	17,428	15,769	29,084	26,255
Net income	63,215	57,673	105,164	100,644
Net (loss) income attributable to noncontrolling interest	(249)	(267)	(668)	(1,717)
Net income attributable to WESCO International, Inc.	63,464	57,940	105,832	102,361
Comprehensive Income:
Foreign currency translation adjustment	20,244	(28,715)	42,763	(57,515)
Comprehensive income attributable to WESCO International, Inc.	$ 83,708	$ 29,225	$ 148,595	$ 44,846
Earnings per share attributable to WESCO International, Inc.
Basic (in dollars per share)	$ 1.46	$ 1.23	$ 2.39	$ 2.18
Diluted (in dollars per share)	$ 1.45	$ 1.22	$ 2.37	$ 2.15
Shipping and Handling [Member]
Cost of goods sold	$ 18,200	$ 18,600	$ 35,200	$ 36,800

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	$ 32,787	$ 32,380
Operating Activities:
Net income	105,164	100,644
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,424	31,703
Deferred income taxes	1,983	6,100
Other operating activities, net	11,961	11,027
Changes in assets and liabilities
Increase (Decrease) in Accounts Receivable	157,387	102,567
Increase (Decrease) in Accounts and Other Receivables	(32,150)	(38,430)
Inventories, net	(39,655)	11,407
Prepaid expenses and other current assets	(7,710)	(12,866)
Accounts payable	62,484	26,073
Accrued payroll and benefit costs	(43,739)	(16,588)
Other current and noncurrent liabilities	(4,450)	(6,542)
Net cash provided by operating activities	(8,775)	86,821
Investing Activities:
Payments to Acquire Businesses, Gross	(27,742)	0
Capital expenditures	(21,402)	(16,384)
Other investing activities	(1,155)	(8,684)
Net cash used in investing activities	(50,299)	(25,068)
Financing Activities:
Proceeds from issuance of short-term debt	34,866	87,861
Repayments of short-term debt	(64,166)	(85,761)
Proceeds from issuance of long-term debt	883,508	794,888
Repayments of Long-term Debt	(654,274)	(848,888)
Other financing activities, net	(472)	(550)
Net cash used in financing activities	50,015	(63,749)
Payments for Repurchase of Common Stock	(152,722)	(1,891)
Proceeds from (Repayments of) Bank Overdrafts	14,676	(9,408)
Payment for Contingent Consideration Liability, Financing Activities	(11,401)	0
Effect of exchange rate on cash and cash equivalents	(66)	(5,017)
Net change in cash and cash equivalents	(9,125)	(7,013)
Cash and cash equivalents at the beginning of period	96,343	117,953
Cash and cash equivalents at the end of period	87,218	110,940
Income Taxes Paid	$ 35,329	$ 33,792

XML

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Common Class B [Member]	Common Stock [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Additional Paid-in Capital [Member]
Common Stock, Value, Issued		$ 43	$ 591
Common Stock, Shares, Issued		4,339,431	59,045,762
Additional capital	$ 999,156
Retained Earnings (Accumulated Deficit)	2,079,697
Treasury Stock, Value	$ (647,158)
ERROR in label resolution.	(16,375,653)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (3,596)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(312,590)
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 0			$ (455)
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	(67)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	3,858
Adjustments Related to Tax Withholding for Share-based Compensation			$ 0				$ 417	$ (1,153)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			(88,554)			(5,521)
Shares Paid for Tax Withholding for Share Based Compensation			(16,614)
Net Income (Loss) Attributable to Parent	44,421
Net Income (Loss) Attributable to Noncontrolling Interest					$ (1,450)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax				$ (28,800)
Net Income (Loss) Attributable to Parent	102,361
Net Income (Loss) Attributable to Noncontrolling Interest	(1,717)
Common Stock, Value, Issued		$ 43	$ 591
Common Stock, Shares, Issued		4,339,431	59,117,702
Additional capital	1,001,794
Retained Earnings (Accumulated Deficit)	2,124,535
Treasury Stock, Value	$ (647,613)
ERROR in label resolution.	(16,381,174)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (5,046)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(341,390)
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 0			$ (230)
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	(31)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	4,102
Adjustments Related to Tax Withholding for Share-based Compensation			$ 0				11	32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			(26,867)			(3,795)
Shares Paid for Tax Withholding for Share Based Compensation			0
Net Income (Loss) Attributable to Parent	57,940
Net Income (Loss) Attributable to Noncontrolling Interest	(267)				(267)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax				(28,715)
Common Stock, Value, Issued		$ 43	$ 591
Common Stock, Shares, Issued		4,339,431	59,144,569
Additional capital	1,005,897
Retained Earnings (Accumulated Deficit)	2,182,486
Treasury Stock, Value	$ (647,843)
ERROR in label resolution.	(16,384,969)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (5,313)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(370,105)
Common Stock, Value, Issued		$ 43	$ 592
Common Stock, Shares, Issued		4,339,431	59,157,696
Additional capital	993,666
Retained Earnings (Accumulated Deficit)	2,307,462
Treasury Stock, Value	$ (758,018)
ERROR in label resolution.	(18,391,042)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (5,584)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(408,435)
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 1			$ (54)
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	(90)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	4,665
ERROR in label resolution.								19,144
Adjustments Related to Tax Withholding for Share-based Compensation			$ 0				(531)	(1,822)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			(156,760)			(184)
Shares Paid for Tax Withholding for Share Based Compensation			(42,564)
Net Income (Loss) Attributable to Parent	42,369
Treasury Stock, Value, Acquired, Cost Method	$ (19,144)
Treasury Stock, Shares, Acquired	(365,272)
Net Income (Loss) Attributable to Noncontrolling Interest					(419)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax				22,517
Net Income (Loss) Attributable to Parent	$ 105,832
Treasury Stock, Shares, Acquired	(2,760,088)
Net Income (Loss) Attributable to Noncontrolling Interest	$ (668)
Common Stock, Value, Issued		$ 43	$ 593
Common Stock, Shares, Issued		4,339,431	59,271,892
Additional capital	1,015,563
Retained Earnings (Accumulated Deficit)	2,349,300
Treasury Stock, Value	$ (777,216)
ERROR in label resolution.	(18,756,498)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (6,003)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(385,918)
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)			$ 0			$ (157)
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	6
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	5,150
ERROR in label resolution.								(22,500)
Adjustments Related to Tax Withholding for Share-based Compensation			$ 0				$ 4	$ (1)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			(20,831)			(3,029)
Shares Paid for Tax Withholding for Share Based Compensation			(19)
Net Income (Loss) Attributable to Parent	63,464
Treasury Stock, Value, Acquired, Cost Method	$ (127,500)
Treasury Stock, Shares, Acquired	(2,394,816)
Net Income (Loss) Attributable to Noncontrolling Interest	$ (249)				$ (249)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax				$ 20,244
Common Stock, Value, Issued		$ 43	$ 593
Common Stock, Shares, Issued		4,339,431	59,292,704
Additional capital	998,218
Retained Earnings (Accumulated Deficit)	2,412,768
Treasury Stock, Value	$ (904,873)
ERROR in label resolution.	(21,154,343)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (6,252)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (365,674)

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ORGANIZATION

6 Months Ended

Jun. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION

1. ORGANIZATION

WESCO International, Inc. ("WESCO International") and its subsidiaries (collectively, “WESCO” or the "Company"), headquartered in Pittsburgh, Pennsylvania, is a full-line distributor of electrical, industrial and communications maintenance, repair and operating ("MRO") and original equipment manufacturer ("OEM") products, construction materials, and advanced supply chain management and logistics services used primarily in the industrial, construction, utility and commercial, institutional and government markets. WESCO serves approximately 70,000 active customers globally through approximately 500 branches primarily located in North America, with operations in 15 additional countries and 10 distribution centers located in the United States and Canada.

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ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

ACCOUNTING POLICIES

2. 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’s 2018 Annual Report on Form 10-K as filed with the SEC on February 27, 2019. The Condensed Consolidated Balance Sheet at December 31, 2018 was derived from the audited Consolidated Financial Statements as of that date, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America.

The unaudited Condensed Consolidated Balance Sheet as of June 30, 2019, the unaudited Condensed Consolidated Statements of Income and Comprehensive Income, and the unaudited Condensed Consolidated Statements of Stockholders' Equity for the three and six months ended June 30, 2019 and 2018, and the unaudited Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2019 and 2018, 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 Accounting Pronouncements

Effective January 1, 2019, WESCO adopted Accounting Standards Update (ASU) 2016-02, Leases, and all the related amendments (“Topic 842”), a comprehensive new standard that amended various aspects of existing accounting guidance for leases. The adoption of Topic 842 resulted in the recognition of right-of-use assets and lease liabilities for operating leases of approximately $240 million and $245 million, respectively, in the Consolidated Balance Sheet as of January 1, 2019, most of which relate to real estate. The adoption of Topic 842 did not have a material impact on the Consolidated Statements of Income and Comprehensive Income or Consolidated Statements of Cash Flows for the three and six months ended June 30, 2019, respectively.

The Company used the optional effective date transition method and therefore did not adjust the prior comparative periods presented herein. There was no cumulative-effect adjustment to beginning retained earnings as a result of using this method. In addition, the Company elected the package of practical expedients that allowed the adoption of Topic 842 without reassessing arrangements that commenced prior to the effective date. Additional qualitative and quantitative information about the Company's leases is disclosed in Note 4.

Recently Issued Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which introduces new guidance for the accounting for credit losses on certain financial instruments. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. Management does not expect the adoption of this accounting standard to have a material impact on its consolidated financial statements and notes thereto.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, which amends the disclosure requirements for recurring and nonrecurring fair value measurements by removing, modifying and adding certain disclosures. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted.

Management does not expect the adoption of this accounting standard to have a material impact on its consolidated financial statements and notes thereto.

In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans, which amends the disclosure requirements for all employers that sponsor defined benefit pension and other post retirement plans by removing and adding certain disclosures. The amendments in this ASU are effective for fiscal years ending after December 15, 2020. Early adoption is permitted. Management does not expect the adoption of this accounting standard to have a material impact on its consolidated financial statements and notes thereto.

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.

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ACQUISITIONS

6 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

Mergers, Acquisitions and Dispositions Disclosures [Text Block]

5. ACQUISITIONS

The following table sets forth the consideration paid for acquisitions:

	Six Months Ended
	June 30
	2019
	(In thousands)
Fair value of assets acquired	$	36,188
Fair value of liabilities assumed	8,446
Cash paid for acquisitions	$	27,742

Sylvania Lighting Services Corp.

On March 5, 2019, WESCO Distribution, Inc. ("WESCO Distribution"), through its WESCO Services, LLC subsidiary, acquired certain assets and assumed certain liabilities of Sylvania Lighting Services Corp. ("SLS"). Headquartered in Wilmington, Massachusetts, SLS offers a full spectrum of energy-efficient lighting upgrade, retrofit, and renovation solutions with annual sales of approximately $100 million and approximately 220 employees across the U.S. and Canada. WESCO Distribution funded the purchase price paid at closing with borrowings under its accounts receivable securitization facility. The purchase price was allocated to the respective assets and liabilities based upon their estimated fair values as of the acquisition date, resulting in goodwill of $5.9 million, which is deductible for tax purposes.

ACQUISITIONS

3. REVENUE

WESCO distributes products and provides services to customers globally within the following end markets: (1) industrial, (2) construction, (3) utility, and (4) commercial, institutional and government. Revenue is measured as the amount of consideration WESCO expects to receive in exchange for transferring goods or providing services.

The following tables disaggregate WESCO’s revenue by end market and geography:

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands)	2019		2018		2019		2018
Industrial	$	761,934	$	760,741	$	1,498,825	$	1,519,723
Construction	704,183		683,752		1,337,483		1,321,551
Utility	346,941		336,961		655,213		652,506
Commercial, Institutional and Government	337,030		322,540		619,834		604,129
Total by end market	$	2,150,088	$	2,103,994	$	4,111,355	$	4,097,909

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands)	2019		2018		2019		2018
United States	$	1,616,347	$	1,563,392	$	3,077,263	$	3,046,140
Canada (1)	415,030		405,981		799,700		804,689
Other International (1)	118,711		134,621		234,392		247,080
Total by geography	$	2,150,088	$	2,103,994	$	4,111,355	$	4,097,909

⁽¹⁾  The prior period has been reclassified to conform to the current period presentation.

In accordance with certain contractual arrangements, WESCO receives payment from its customers in advance and recognizes such payment as deferred revenue. Revenue for advance payment is recognized 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 customer’s advance payment. At June 30, 2019 and December 31, 2018, $10.4 million and $11.8 million, respectively, of deferred revenue was recorded as a component of other current liabilities in the Condensed Consolidated Balance Sheets.

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 anticipated performance, historical data, as well as current and forecasted information. Measurement and recognition of variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended June 30, 2019 and 2018 by approximately $28.5 million and $25.0 million, respectively, and by approximately $53.8 million and $49.4 million for the six months ended June 30, 2019 and 2018, respectively.

Shipping and handling costs are recognized in net sales when they are billed to the customer. These costs are recognized as a component of selling, general and administrative expenses when WESCO does not bill the customer. WESCO has elected to recognize shipping and handling costs as a fulfillment cost. Shipping and handling costs recorded as a component of selling, general and administrative expenses totaled $18.2 million and $18.6 million for the three months ended June 30, 2019 and 2018, respectively, and $35.2 million and $36.8 million for the six months ended June 30, 2019 and 2018, respectively.

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STOCK-BASED COMPENSATION

6 Months Ended

Jun. 30, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

. STOCK-BASED COMPENSATION

WESCO’s stock-based employee compensation plans are comprised of 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-settled stock appreciation rights and performance-based awards with market conditions is determined using the Black-Scholes and Monte Carlo simulation models, respectively. 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 employee behavior that is reviewed on an annual basis. No dividends are assumed. For 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-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. Vesting of restricted stock units is based on a minimum time period of three years. 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 and performance-based awards would vest at the target level.

Performance-based awards granted in 2019 were based on two equally-weighted performance measures: the three-year average growth rate of WESCO's net income and the three-year cumulative return on net assets. Performance-based awards granted in 2018 were based on two equally-weighted performance measures: the three-year average growth rate of the Company’s fully diluted earnings per share and the three-year cumulative return on net assets. From 2015 to 2017, the two equally-weighted performance-based award metrics were the three-year average growth rate of WESCO's net income and WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period.

During the three and six months ended June 30, 2019 and 2018, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:

	Three Months Ended				Six Months Ended
	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
Stock-settled stock appreciation rights granted	—		8,402		213,618		499,631
Weighted-average fair value	$	—	$	17.85	$	16.36	$	18.39
Restricted stock units granted	—		2,502		175,544		116,771
Weighted-average fair value	$	—	$	59.95	$	54.64	$	62.75
Performance-based awards granted	—		—		126,874		44,144
Weighted-average fair value	$	—	$	—	$	54.64	$	62.80

The fair value of stock-settled stock appreciation rights was estimated using the following weighted-average assumptions:

	Three Months Ended			Six Months Ended
	June 30, 2019	June 30, 2018		June 30, 2019		June 30, 2018
Risk free interest rate	n/a	2.8	%	2.5	%	2.5	%
Expected life (in years)	n/a	5		5		5
Expected volatility	n/a	28	%	29	%	28	%

The risk-free interest rate is based on the U.S. Treasury Daily Yield Curve as of the grant date. The expected life is based on historical exercise experience and the expected volatility is based on the volatility of the Company's daily stock prices over a five-year period preceding the grant date.

The following table sets forth a summary of stock-settled stock appreciation rights and related information for the six months ended June 30, 2019:

	Awards		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (In years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2018	2,351,633		$	59.26
Granted	213,618		54.63
Exercised	(106,044	)	34.70
Forfeited	(44,877	)	70.10
Outstanding at June 30, 2019	2,414,330		59.73		6.2	$	6,739
Exercisable at June 30, 2019	1,749,679		$	59.01	5.2	$	6,739

The following table sets forth a summary of time-based restricted stock units and related information for the six months ended June 30, 2019:

	Awards		Weighted- Average Fair Value
Unvested at December 31, 2018	327,798		$	57.87
Granted	175,544		54.64
Vested	(116,858	)	44.32
Forfeited	(2,937	)	56.16
Unvested at June 30, 2019	383,547		$	60.46

Performance shares are awards for which the vesting will occur based on market or performance conditions. The following table sets forth a summary of performance-based awards for the six months ended June 30, 2019:

	Awards		Weighted- Average Fair Value
Unvested at December 31, 2018	138,896		$	59.33
Granted	126,874		54.64
Vested	(25,696	)	42.44
Forfeited	(35,486	)	50.79
Unvested at June 30, 2019	204,588		$	60.11

The unvested performance-based awards in the table above include 17,507 shares in which vesting of the ultimate number of shares is dependent upon WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period. These awards are accounted for as awards with market conditions; compensation cost is recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest.

Vesting of the remaining 187,081 shares of performance-based awards in the table above is dependent upon the achievement of certain performance targets, including 80,944 that are dependent upon the three-year average growth rate of WESCO's net income, 21,350 that are dependent upon the three-year average growth rate of the Company's fully diluted earnings per share, and 84,787 that are based upon 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.

WESCO recognized $5.2 million and $4.4 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the three months ended June 30, 2019 and 2018, respectively. WESCO recognized $9.8 million and $8.0 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the six months ended June 30, 2019 and 2018, respectively. As of June 30, 2019, there was $31.4 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements for all awards previously made, of which approximately $10.2 million is expected to be recognized over the remainder of 2019, $13.5 million in 2020, $7.0 million in 2021 and $0.7 million in 2022.

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EARNINGS PER SHARE

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

EARNINGS PER SHARE

8. EARNINGS PER SHARE

Basic earnings per share is computed by dividing net income attributable to WESCO International by the weighted-average number of common shares outstanding during the periods. Diluted earnings per share is computed by dividing net income attributable to WESCO International 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 details of basic and diluted earnings per share:

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands, except per share data)	2019		2018		2019		2018
Net income attributable to WESCO International	$	63,464	$	57,940	$	105,832	$	102,361
Weighted-average common shares outstanding used in computing basic earnings per share	43,493		47,085		44,280		47,062
Common shares issuable upon exercise of dilutive equity awards	323		465		381		516
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share	43,816		47,550		44,661		47,578
Earnings per share attributable to WESCO International
Basic	$	1.46	$	1.23	$	2.39	$	2.18
Diluted	$	1.45	$	1.22	$	2.37	$	2.15

For the three and six months ended June 30, 2019, the computation of diluted earnings per share attributable to WESCO International excluded stock-based awards of approximately 1.8 million. For the three and six months ended June 30, 2018, the computation of diluted earnings per share attributable to WESCO International excluded stock-based awards of approximately 1.5 million. These amounts were excluded because their effect would have been antidilutive.

In December 2017, the Company's Board of Directors authorized the repurchase of up to $300 million of the Company's common stock through December 31, 2020. In October 2018, the Board approved an increase to this repurchase authorization from $300 million to $400 million.

On May 7, 2019, the Company entered into an accelerated stock repurchase agreement (the "ASR Transaction") with a financial institution to repurchase additional shares of its common stock. In exchange for an up-front cash payment of $150.0 million, the Company received 2,394,816 shares during the three months ended June 30, 2019. As of June 30, 2019, the ASR Transaction had not yet settled between the counterparties. Upon settlement, the Company expects to receive additional shares. WESCO funded the repurchase primarily with borrowings under its accounts receivable securitization facility. For the six months ended June 30, 2019, the Company received a total of 2,760,088 shares, of which 365,272 were received upon the settlement of an accelerated stock repurchase agreement entered into on November 6, 2018.

The total number of shares ultimately delivered under an accelerated stock repurchase transaction is determined by the average of the volume-weighted-average price of the Company's common stock for each exchange business day during the respective settlement valuation periods. For purposes of computing earnings per share for the three and six months ended June 30, 2019, shares repurchases have been reflected as a reduction to common shares outstanding on the respective delivery dates.

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EMPLOYEE BENEFIT PLANS

6 Months Ended

Jun. 30, 2019

Retirement Benefits [Abstract]

EMPLOYEE BENEFIT PLANS

9. EMPLOYEE BENEFIT PLANS

A majority of WESCO’s employees are covered by defined contribution retirement savings plans for their services rendered subsequent to WESCO’s formation. WESCO also offers a deferred compensation plan for select individuals. For U.S. participants, WESCO matches contributions made by employees at an amount equal to 50% of participants' total monthly contributions up to a maximum of 6% of eligible compensation. For Canadian participants, WESCO makes contributions in amounts ranging from 3% to 5% of participants' eligible compensation based on years of continuous service. WESCO may also make, subject to the Board of Directors' approval, a discretionary contribution to the defined contribution retirement savings plan covering U.S. participants if certain predetermined profit levels are attained. For the six months ended June 30, 2019 and 2018, WESCO incurred charges of $18.9 million and $21.9 million, respectively, for all such plans. Contributions are made in cash to employee retirement savings plan accounts. The deferred compensation plan is an unfunded plan. As of June 30, 2019 and December 31, 2018, the Company's obligation under the deferred compensation plan was $23.7 million and $21.9 million, respectively. Employees have the option to transfer balances allocated to their accounts in the defined contribution retirement savings plan and the deferred compensation plan into any of the available investment options.

The Company sponsors a contributory defined benefit plan covering substantially all Canadian employees of EECOL and a Supplemental Executive Retirement Plan (the "SERP") for certain executives of EECOL. During the three and six months ended June 30, 2019, the Company contributed $0.1 million and $0.2 million, respectively, to the SERP.

The following table sets forth the components of net periodic benefit costs for the defined benefit plans:

	Three Months Ended						Six Months Ended
	June 30						June 30
(In thousands)	2019			2018			2019			2018
Service cost	$	1,139		$	1,312		$	2,288		$	2,659
Interest cost	1,080			1,039			2,169			2,105
Expected return on plan assets	(1,410		)	(1,500		)	(2,832		)	(3,040		)
Recognized actuarial gain	(15		)	(12		)	(31		)	(24		)
Net periodic benefit cost	$	794		$	839		$	1,594		$	1,700

The service cost of $1.1 million and $1.3 million for the three months ended June 30, 2019 and 2018, respectively, and $2.3 million and $2.7 million for the six months ended June 30, 2019 and 2018, respectively, was reported as a component of selling, general and administrative expenses. The other components of net periodic benefit cost totaling a net benefit of $0.3 million and $0.5 million for the three months ended June 30, 2019 and 2018, respectively, and $0.7 million and $1.0 million for the six months ended June 30, 2019 and 2018, respectively, were presented as a component of net interest and other.

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COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

11. 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. 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.

In an effort to expand the Company's footprint in the Middle East, WESCO has been doing business since 2009 with WESTEC Supplies General Trading (“WESTEC”), an industrial equipment supplier headquartered in the United Arab Emirates. WESTEC has a line of credit with a maximum borrowing capacity of approximately $6.8 million to support its working capital requirements and joint sales efforts with WESCO. Due to the nature of WESCO’s arrangement with WESTEC, WESCO has provided a standby letter of credit under its revolving credit facility of up to $7.3 million as security for WESTEC’s line of credit. As of June 30, 2019, WESTEC had an outstanding loan balance of $6.0 million. Management currently believes the estimated fair value of the noncontingent guarantee on the line of credit is nominal and therefore a liability has not been recorded as of June 30, 2019.

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INCOME TAXES

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

INCOME TAXES

12. INCOME TAXES

The effective tax rate for the three and six months ended June 30, 2019 was 21.6% and 21.7%, respectively. The effective tax rate for the three and six months ended June 30, 2018 was 21.5% and 20.7%, respectively. WESCO’s effective tax rate is typically impacted by the tax effect of intercompany financing, foreign tax rate differences, nondeductible expenses and state income taxes. The higher effective tax rate for the six months ended June 30, 2019 was primarily due to the full application of the international provisions of U.S. tax reform. There have been no material adjustments to liabilities for uncertain tax positions since the last annual disclosure for the year ended December 31, 2018.

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OTHER FINANCIAL INFORMATION

6 Months Ended

Jun. 30, 2019

Condensed Financial Information [Abstract]

OTHER FINANCIAL INFORMATION

13. CONDENSED CONSOLIDATING FINANCIAL INFORMATION

WESCO Distribution has outstanding $500 million in aggregate principal amount of 5.375% Senior Notes due 2021 (the "2021 Notes") and $350 million in aggregate principal amount of 5.375% Senior Notes due 2024 (the "2024 Notes"). The 2021 Notes and 2024 Notes are unsecured senior obligations of WESCO Distribution and are fully and unconditionally guaranteed on a senior unsecured basis by WESCO International.

Condensed consolidating financial information for WESCO International, WESCO Distribution and the non-guarantor subsidiaries is presented in the following tables.

	Condensed Consolidating Balance Sheet
	June 30, 2019
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	—	$	34,401	$	52,817		$	—		$	87,218
Trade accounts receivable, net	—		—		1,355,541			—			1,355,541
Inventories	—		455,898		548,229			—			1,004,127
Prepaid expenses and other current assets	1,123		17,703		121,956			(2,804		)	137,978
Total current assets	1,123		508,002		2,078,543			(2,804		)	2,584,864
Intercompany receivables, net	—		—		2,521,347			(2,521,347		)	—
Property, buildings and equipment, net	—		73,401		98,958			—			172,359
Operating lease assets	—		139,468		93,935			—			233,403
Intangible assets, net	—		1,816		302,576			—			304,392
Goodwill	—		257,623		1,495,177			—			1,752,800
Investments in affiliates	3,336,052		5,276,915		—			(8,612,967		)	—
Other assets	—		2,597		17,521			—			20,118
Total assets	$	3,337,175	$	6,259,822	$	6,608,057		$	(11,137,118	)	$	5,067,936
Accounts payable	$	—	$	418,469	$	450,136		$	—		$	868,605
Short-term debt	—		—		27,217			—			27,217
Other current liabilities	—		66,660		165,154			(2,804		)	229,010
Total current liabilities	—		485,129		642,507			(2,804		)	1,124,832
Intercompany payables, net	1,196,100		1,325,247		—			(2,521,347		)	—
Long-term debt, net	—		892,909		506,577			—			1,399,486
Operating lease liabilities	—		110,360		67,547			—			177,907
Other noncurrent liabilities	—		110,125		120,763			—			230,888
Total WESCO International stockholders' equity	2,141,075		3,336,052		5,276,915			(8,612,967		)	2,141,075
Noncontrolling interests	—		—		(6,252		)	—			(6,252		)
Total liabilities and stockholders’ equity	$	3,337,175	$	6,259,822	$	6,608,057		$	(11,137,118	)	$	5,067,936

	Condensed Consolidating Balance Sheet
	December 31, 2018
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	—	$	35,931	$	60,412		$	—		$	96,343
Trade accounts receivable, net	—		—		1,166,607			—			1,166,607
Inventories	—		440,422		508,304			—			948,726
Prepaid expenses and other current assets	1,123		57,586		124,523			(9,268		)	173,964
Total current assets	1,123		533,939		1,859,846			(9,268		)	2,385,640
Intercompany receivables, net	—		—		2,403,704			(2,403,704		)	—
Property, buildings and equipment, net	—		63,506		97,372			—			160,878
Intangible assets, net	—		2,131		313,885			—			316,016
Goodwill	—		257,623		1,464,980			—			1,722,603
Investments in affiliates	3,182,469		5,137,783		—			(8,320,252		)	—
Other assets	—		2,905		16,994			—			19,899
Total assets	$	3,183,592	$	5,997,887	$	6,156,781		$	(10,733,224	)	$	4,605,036
Accounts payable	$	—	$	404,373	$	389,975		$	—		$	794,348
Short-term debt	—		—		30,785			—			30,785
Other current liabilities	—		86,600		159,481			(9,268		)	236,813
Total current liabilities	—		490,973		580,241			(9,268		)	1,061,946
Intercompany payables, net	1,048,282		1,355,422		—			(2,403,704		)	—
Long-term debt, net	—		842,093		325,218			—			1,167,311
Other noncurrent liabilities	—		126,930		119,123			—			246,053
Total WESCO International stockholders' equity	2,135,310		3,182,469		5,137,783			(8,320,252		)	2,135,310
Noncontrolling interests	—		—		(5,584		)	—			(5,584		)
Total liabilities and stockholders’ equity	$	3,183,592	$	5,997,887	$	6,156,781		$	(10,733,224	)	$	4,605,036

	Condensed Consolidating Statement of Income and Comprehensive Income
	Three Months Ended
	June 30, 2019
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	938,333	$	1,255,952		$	(44,197	)	$	2,150,088
Cost of goods sold (excluding depreciation and
amortization)	—		763,036		1,022,275			(44,197		)	1,741,114
Selling, general and administrative expenses	—		146,133		149,709			—			295,842
Depreciation and amortization	—		4,471		10,711			—			15,182
Results of affiliates’ operations	63,215		53,962		—			(117,177		)	—
Net interest and other	—		12,880		4,427			—			17,307
Income tax expense	—		2,560		14,868			—			17,428
Net income	63,215		63,215		53,962			(117,177		)	63,215
Net loss attributable to noncontrolling interests	—		—		(249		)	—			(249		)
Net income attributable to WESCO International	$	63,215	$	63,215	$	54,211		$	(117,177	)	$	63,464
Other comprehensive income:
Foreign currency translation adjustments	20,244		20,244		20,244			(40,488		)	20,244
Comprehensive income attributable to WESCO International	$	83,459	$	83,459	$	74,455		$	(157,665	)	$	83,708

	Condensed Consolidating Statement of Income and Comprehensive Income
	Six Months Ended
	June 30, 2019
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	1,796,315	$	2,398,346		$	(83,306	)	$	4,111,355
Cost of goods sold (excluding depreciation and
amortization)	—		1,452,592		1,950,600			(83,306		)	3,319,886
Selling, general and administrative expenses	—		298,562		293,808			—			592,370
Depreciation and amortization	—		9,027		21,397			—			30,424
Results of affiliates’ operations	105,164		96,375		—			(201,539		)	—
Net interest and other	—		24,914		9,513			—			34,427
Income tax expense	—		2,431		26,653			—			29,084
Net income	105,164		105,164		96,375			(201,539		)	105,164
Net loss attributable to noncontrolling interests	—		—		(668		)	—			(668		)
Net income attributable to WESCO International	$	105,164	$	105,164	$	97,043		$	(201,539	)	$	105,832
Other comprehensive income:
Foreign currency translation adjustments	42,763		42,763		42,763			(85,526		)	42,763
Comprehensive income attributable to WESCO International	$	147,927	$	147,927	$	139,806		$	(287,065	)	$	148,595

	Condensed Consolidating Statement of Income and Comprehensive Income
	Three Months Ended
	June 30, 2018
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	921,075		$	1,222,369		$	(39,450	)	$	2,103,994
Cost of goods sold (excluding depreciation and
amortization)	—			746,373			997,177			(39,450		)	1,704,100
Selling, general and administrative expenses	—			147,566			145,322			—			292,888
Depreciation and amortization	—			4,656			11,167			—			15,823
Results of affiliates’ operations	57,673			51,122			—			(108,795		)	—
Net interest and other	—			14,259			3,482			—			17,741
Income tax expense	—			1,670			14,099			—			15,769
Net income	57,673			57,673			51,122			(108,795		)	57,673
Net loss attributable to noncontrolling interests	—			—			(267		)	—			(267		)
Net income attributable to WESCO International	$	57,673		$	57,673		$	51,389		$	(108,795	)	$	57,940
Other comprehensive loss:
Foreign currency translation adjustments	(28,715		)	(28,715		)	(28,715		)	57,430			(28,715		)
Comprehensive income attributable to WESCO International	$	28,958		$	28,958		$	22,674		$	(51,365	)	$	29,225

	Condensed Consolidating Statement of Income and Comprehensive Income
	Six Months Ended
	June 30, 2018
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	1,803,474		$	2,372,479		$	(78,044	)	$	4,097,909
Cost of goods sold (excluding depreciation and
amortization)	—			1,462,631			1,933,479			(78,044		)	3,318,066
Selling, general and administrative expenses	—			298,047			285,670			—			583,717
Depreciation and amortization	—			9,275			22,428			—			31,703
Results of affiliates’ operations	100,644			96,325			—			(196,969		)	—
Net interest and other	—			28,076			9,448			—			37,524
Income tax expense	—			1,126			25,129			—			26,255
Net income	100,644			100,644			96,325			(196,969		)	100,644
Net loss attributable to noncontrolling interests	—			—			(1,717		)	—			(1,717		)
Net income attributable to WESCO International	$	100,644		$	100,644		$	98,042		$	(196,969	)	$	102,361
Other comprehensive loss:
Foreign currency translation adjustments	(57,515		)	(57,515		)	(57,515		)	115,030			(57,515		)
Comprehensive income attributable to WESCO International	$	43,129		$	43,129		$	40,527		$	(81,939	)	$	44,846

	Condensed Consolidating Statement of Cash Flows
	Six Months Ended
	June 30, 2019
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash provided by (used in) operating activities	$	4,904		$	128,070		$	(141,749	)	$	—		$	(8,775	)
Investing activities:
Capital expenditures	—			(5,843		)	(15,559		)	—			(21,402		)
Acquisition payments	—			(27,742		)	—			—			(27,742		)
Dividends received from subsidiaries	—			44,417			—			(44,417		)	—
Other	—			(192,235		)	(1,155		)	192,235			(1,155		)
Net cash used in investing activities	—			(181,403		)	(16,714		)	147,818			(50,299		)
Financing activities:
Borrowings	147,818			242,134			720,657			(192,235		)	918,374
Repayments	—			(193,134		)	(525,306		)	—			(718,440		)
Repurchases of common stock	(152,722		)	—			—			—			(152,722		)
Dividends paid by subsidiaries	—			—			(44,417		)	44,417			—
Other	—			2,803			—			—			2,803
Net cash (used in) provided by financing activities	(4,904		)	51,803			150,934			(147,818		)	50,015
Effect of exchange rate changes on cash and cash equivalents	—			—			(66		)	—			(66		)
Net change in cash and cash equivalents	—			(1,530		)	(7,595		)	—			(9,125		)
Cash and cash equivalents at the beginning of period	—			35,931			60,412			—			96,343
Cash and cash equivalents at the end of period	$	—		$	34,401		$	52,817		$	—		$	87,218

	Condensed Consolidating Statement of Cash Flows
	Six Months Ended
	June 30, 2018
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash provided by operating activities	$	9,878		$	31,192		$	45,751		$	—		$	86,821
Investing activities:
Capital expenditures	—			(9,334		)	(7,050		)	—			(16,384		)
Dividends received from subsidiaries	—			95,511			—			(95,511		)	—
Other	—			(37,524		)	(8,684		)	37,524			(8,684		)
Net cash provided by (used in) investing activities	—			48,653			(15,734		)	(57,987		)	(25,068		)
Financing activities:
Borrowings	—			191,888			736,372			(45,511		)	882,749
Repayments	(7,987		)	(260,888		)	(673,761		)	7,987			(934,649		)
Repurchases of common stock	(1,891		)	—			—			—			(1,891		)
Dividends paid by subsidiaries	—			—			(95,511		)	95,511			—
Other	—			(9,958		)	—			—			(9,958		)
Net cash used in financing activities	(9,878		)	(78,958		)	(32,900		)	57,987			(63,749		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(5,017		)	—			(5,017		)
Net change in cash and cash equivalents	—			887			(7,900		)	—			(7,013		)
Cash and cash equivalents at the beginning of period	—			50,602			67,351			—			117,953
Cash and cash equivalents at the end of period	$	—		$	51,489		$	59,451		$	—		$	110,940

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Subsequent Events SUBSEQUENT EVENTS (Notes)

6 Months Ended

Jun. 30, 2019

Subsequent Events [Abstract]

Subsequent Events [Text Block]

14. SUBSEQUENT EVENTS

The Company evaluated subsequent events and concluded that no subsequent events have occurred that would require recognition in the unaudited Condensed Consolidated Financial Statements or disclosure in the Notes thereto.

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GOODWILL (Notes)

6 Months Ended

Jun. 30, 2019

Goodwill [Line Items]

Goodwill Disclosure [Text Block]

6. GOODWILL

The following table sets forth the changes in the carrying value of goodwill:

	Six Months Ended
	June 30
(In thousands)	2019
Beginning balance January 1	$	1,722,603
Foreign currency exchange rate changes	24,251
Additions to goodwill for acquisitions	5,946
Ending balance June 30	$	1,752,800

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NET INTEREST AND OTHER (Notes)

6 Months Ended

Jun. 30, 2019

Other Income and Expenses [Abstract]

Other Nonoperating Income and Expense [Text Block]

10. FAIR VALUE OF FINANCIAL INSTRUMENTS

The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable, bank overdrafts, and outstanding indebtedness. 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 reported carrying amounts of WESCO's financial instruments approximated their fair values as of June 30, 2019 and December 31, 2018.

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LEASES (Notes)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Leases of Lessee Disclosure [Text Block]

4. LEASES

WESCO leases real estate, automobiles, trucks and other equipment. The determination of whether an arrangement is, or contains, a lease is performed at the inception of the arrangement. Classification and initial measurement of the right-of-use asset and lease liability are determined at the lease commencement date. The Company elected the short-term lease measurement and recognition exemption; therefore, leases with an initial term of 12 months or less are not recorded on the balance sheet.

The Company's arrangements include certain non-lease components such as common area and other maintenance for leased real estate, as well as mileage, fuel and maintenance costs related to leased automobiles and trucks. WESCO accounts for these nonlease components separately from the associated lease components. The Company does not guarantee any residual value in its lease agreements, and there are no material restrictions or covenants imposed by lease arrangements. Real estate leases typically include one or more options to extend the lease. The Company regularly evaluates the renewal options, and when they are reasonably certain of exercise, the Company includes the renewal period in its lease term. The Company uses the interest rate implicit in its leases to discount lease payments at the lease commencement date. When the implicit rate is not readily available, the Company uses its incremental borrowing rate.

The Company's finance leases, which are recorded in the Condensed Consolidated Balance Sheet as of June 30, 2019 as a component of property, buildings and equipment, current portion of long-term debt and long-term debt, respectively, are not material to the consolidated financial statements and notes thereto. Accordingly, finance leases have not been disclosed herein.

The following table sets forth supplemental balance sheet information related to operating leases for the period presented:

	As of
(In thousands)	June 30, 2019
Operating lease assets	$	233,403
Current operating lease liabilities	60,294
Noncurrent operating lease liabilities	177,907
Total operating lease liabilities	$	238,201

The following table sets forth the Company's total lease cost, which is recorded as a component of selling, general and administrative expenses, for the periods presented:

	Three Months Ended		Six Months Ended
	June 30		June 30
(In thousands)	2019		2019
Operating lease cost	$	18,285	$	36,274
Short-term lease cost	22		33
Variable lease cost	6,463		11,784
Total lease cost	$	24,770	$	48,091

Variable lease cost consists of the non-lease components described above, as well as taxes and insurance for WESCO's leased real estate.

The following table sets forth supplemental cash flow information related to operating leases for the period presented:

	Six Months Ended
	June 30
(In thousands)	2019
Operating cash flows from operating leases	$	32,214
Right-of-use assets obtained in exchange for new operating lease liabilities	26,731

As of June 30, 2019, the weighted-average remaining lease term for operating leases was 5.5 years and the weighted-average discount rate used to measure operating lease assets and liabilities was 4.6%.

The following table sets forth the maturities of the Company's operating lease liabilities and reconciles the respective undiscounted payments to the operating lease liabilities in the Condensed Consolidated Balance Sheet as of June 30, 2019:

	(In thousands)
2019	$	36,218
2020	64,614
2021	53,127
2022	39,774
2023	30,201
Thereafter	47,550
Total undiscounted operating lease payments	271,484
Less: interest	(33,283		)
Total operating lease liabilities	$	238,201

The following table sets forth the future minimum rental payments for operating leases accounted for in accordance with Accounting Standards Codification Topic 840, Leases, as of December 31, 2018:

Years ending December 31	(In thousands)
2019	$	71,640
2020	59,594
2021	47,264
2022	34,490
2023	24,493
Thereafter	40,302

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ACCOUNTING POLICIES (Policies)

6 Months Ended

Jun. 30, 2019

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’s 2018 Annual Report on Form 10-K as filed with the SEC on February 27, 2019. The Condensed Consolidated Balance Sheet at December 31, 2018 was derived from the audited Consolidated Financial Statements as of that date, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America.

The unaudited Condensed Consolidated Balance Sheet as of June 30, 2019, the unaudited Condensed Consolidated Statements of Income and Comprehensive Income, and the unaudited Condensed Consolidated Statements of Stockholders' Equity for the three and six months ended June 30, 2019 and 2018, and the unaudited Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2019 and 2018, 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 Accounting Pronouncements

Effective January 1, 2019, WESCO adopted Accounting Standards Update (ASU) 2016-02, Leases, and all the related amendments (“Topic 842”), a comprehensive new standard that amended various aspects of existing accounting guidance for leases. The adoption of Topic 842 resulted in the recognition of right-of-use assets and lease liabilities for operating leases of approximately $240 million and $245 million, respectively, in the Consolidated Balance Sheet as of January 1, 2019, most of which relate to real estate. The adoption of Topic 842 did not have a material impact on the Consolidated Statements of Income and Comprehensive Income or Consolidated Statements of Cash Flows for the three and six months ended June 30, 2019, respectively.

The Company used the optional effective date transition method and therefore did not adjust the prior comparative periods presented herein. There was no cumulative-effect adjustment to beginning retained earnings as a result of using this method. In addition, the Company elected the package of practical expedients that allowed the adoption of Topic 842 without reassessing arrangements that commenced prior to the effective date. Additional qualitative and quantitative information about the Company's leases is disclosed in Note 4.

Fair Value of Financial Instruments

10. FAIR VALUE OF FINANCIAL INSTRUMENTS

The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable, bank overdrafts, and outstanding indebtedness. 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 reported carrying amounts of WESCO's financial instruments approximated their fair values as of June 30, 2019 and December 31, 2018.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Issued Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which introduces new guidance for the accounting for credit losses on certain financial instruments. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. Management does not expect the adoption of this accounting standard to have a material impact on its consolidated financial statements and notes thereto.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement, which amends the disclosure requirements for recurring and nonrecurring fair value measurements by removing, modifying and adding certain disclosures. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted.

Management does not expect the adoption of this accounting standard to have a material impact on its consolidated financial statements and notes thereto.

In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans, which amends the disclosure requirements for all employers that sponsor defined benefit pension and other post retirement plans by removing and adding certain disclosures. The amendments in this ASU are effective for fiscal years ending after December 15, 2020. Early adoption is permitted. Management does not expect the adoption of this accounting standard to have a material impact on its consolidated financial statements and notes thereto.

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.

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COMMITMENTS AND CONTINGENCIES Guarantee (Policies)

6 Months Ended

Jun. 30, 2019

Guarantees and Product Warranties [Abstract]

Guarantees [Text Block]

In an effort to expand the Company's footprint in the Middle East, WESCO has been doing business since 2009 with WESTEC Supplies General Trading (“WESTEC”), an industrial equipment supplier headquartered in the United Arab Emirates. WESTEC has a line of credit with a maximum borrowing capacity of approximately $6.8 million to support its working capital requirements and joint sales efforts with WESCO. Due to the nature of WESCO’s arrangement with WESTEC, WESCO has provided a standby letter of credit under its revolving credit facility of up to $7.3 million as security for WESTEC’s line of credit. As of June 30, 2019, WESTEC had an outstanding loan balance of $6.0 million. Management currently believes the estimated fair value of the noncontingent guarantee on the line of credit is nominal and therefore a liability has not been recorded as of June 30, 2019.

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ACQUISITIONS (Tables)

6 Months Ended

Jun. 30, 2019

Acquisitions [Abstract]

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

	Six Months Ended
	June 30
	2019
	(In thousands)
Fair value of assets acquired	$	36,188
Fair value of liabilities assumed	8,446
Cash paid for acquisitions	$	27,742

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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2019

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 and six months ended June 30, 2019 and 2018, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:

	Three Months Ended				Six Months Ended
	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
Stock-settled stock appreciation rights granted	—		8,402		213,618		499,631
Weighted-average fair value	$	—	$	17.85	$	16.36	$	18.39
Restricted stock units granted	—		2,502		175,544		116,771
Weighted-average fair value	$	—	$	59.95	$	54.64	$	62.75
Performance-based awards granted	—		—		126,874		44,144
Weighted-average fair value	$	—	$	—	$	54.64	$	62.80

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

The following table sets forth a summary of stock-settled stock appreciation rights and related information for the six months ended June 30, 2019:

	Awards		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (In years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2018	2,351,633		$	59.26
Granted	213,618		54.63
Exercised	(106,044	)	34.70
Forfeited	(44,877	)	70.10
Outstanding at June 30, 2019	2,414,330		59.73		6.2	$	6,739
Exercisable at June 30, 2019	1,749,679		$	59.01	5.2	$	6,739

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table sets forth a summary of time-based restricted stock units and related information for the six months ended June 30, 2019:

	Awards		Weighted- Average Fair Value
Unvested at December 31, 2018	327,798		$	57.87
Granted	175,544		54.64
Vested	(116,858	)	44.32
Forfeited	(2,937	)	56.16
Unvested at June 30, 2019	383,547		$	60.46

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

The following table sets forth a summary of performance-based awards for the six months ended June 30, 2019:

	Awards		Weighted- Average Fair Value
Unvested at December 31, 2018	138,896		$	59.33
Granted	126,874		54.64
Vested	(25,696	)	42.44
Forfeited	(35,486	)	50.79
Unvested at June 30, 2019	204,588		$	60.11

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 value of stock-settled stock appreciation rights was estimated using the following weighted-average assumptions:

	Three Months Ended			Six Months Ended
	June 30, 2019	June 30, 2018		June 30, 2019		June 30, 2018
Risk free interest rate	n/a	2.8	%	2.5	%	2.5	%
Expected life (in years)	n/a	5		5		5
Expected volatility	n/a	28	%	29	%	28	%

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EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the details of basic and diluted earnings per share:

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands, except per share data)	2019		2018		2019		2018
Net income attributable to WESCO International	$	63,464	$	57,940	$	105,832	$	102,361
Weighted-average common shares outstanding used in computing basic earnings per share	43,493		47,085		44,280		47,062
Common shares issuable upon exercise of dilutive equity awards	323		465		381		516
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share	43,816		47,550		44,661		47,578
Earnings per share attributable to WESCO International
Basic	$	1.46	$	1.23	$	2.39	$	2.18
Diluted	$	1.45	$	1.22	$	2.37	$	2.15

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EMPLOYEE BENEFIT PLANS Schedule of Net Benefit Costs (Tables)

6 Months Ended

Jun. 30, 2019

Postemployment Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

The following table sets forth the components of net periodic benefit costs for the defined benefit plans:

	Three Months Ended						Six Months Ended
	June 30						June 30
(In thousands)	2019			2018			2019			2018
Service cost	$	1,139		$	1,312		$	2,288		$	2,659
Interest cost	1,080			1,039			2,169			2,105
Expected return on plan assets	(1,410		)	(1,500		)	(2,832		)	(3,040		)
Recognized actuarial gain	(15		)	(12		)	(31		)	(24		)
Net periodic benefit cost	$	794		$	839		$	1,594		$	1,700

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OTHER FINANCIAL INFORMATION (Tables)

6 Months Ended

Jun. 30, 2019

Condensed Balance Sheet Statements, Captions [Line Items]

Condensed Balance Sheet [Table Text Block]

	Condensed Consolidating Balance Sheet
	June 30, 2019
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	—	$	34,401	$	52,817		$	—		$	87,218
Trade accounts receivable, net	—		—		1,355,541			—			1,355,541
Inventories	—		455,898		548,229			—			1,004,127
Prepaid expenses and other current assets	1,123		17,703		121,956			(2,804		)	137,978
Total current assets	1,123		508,002		2,078,543			(2,804		)	2,584,864
Intercompany receivables, net	—		—		2,521,347			(2,521,347		)	—
Property, buildings and equipment, net	—		73,401		98,958			—			172,359
Operating lease assets	—		139,468		93,935			—			233,403
Intangible assets, net	—		1,816		302,576			—			304,392
Goodwill	—		257,623		1,495,177			—			1,752,800
Investments in affiliates	3,336,052		5,276,915		—			(8,612,967		)	—
Other assets	—		2,597		17,521			—			20,118
Total assets	$	3,337,175	$	6,259,822	$	6,608,057		$	(11,137,118	)	$	5,067,936
Accounts payable	$	—	$	418,469	$	450,136		$	—		$	868,605
Short-term debt	—		—		27,217			—			27,217
Other current liabilities	—		66,660		165,154			(2,804		)	229,010
Total current liabilities	—		485,129		642,507			(2,804		)	1,124,832
Intercompany payables, net	1,196,100		1,325,247		—			(2,521,347		)	—
Long-term debt, net	—		892,909		506,577			—			1,399,486
Operating lease liabilities	—		110,360		67,547			—			177,907
Other noncurrent liabilities	—		110,125		120,763			—			230,888
Total WESCO International stockholders' equity	2,141,075		3,336,052		5,276,915			(8,612,967		)	2,141,075
Noncontrolling interests	—		—		(6,252		)	—			(6,252		)
Total liabilities and stockholders’ equity	$	3,337,175	$	6,259,822	$	6,608,057		$	(11,137,118	)	$	5,067,936

	Condensed Consolidating Balance Sheet
	December 31, 2018
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Cash and cash equivalents	$	—	$	35,931	$	60,412		$	—		$	96,343
Trade accounts receivable, net	—		—		1,166,607			—			1,166,607
Inventories	—		440,422		508,304			—			948,726
Prepaid expenses and other current assets	1,123		57,586		124,523			(9,268		)	173,964
Total current assets	1,123		533,939		1,859,846			(9,268		)	2,385,640
Intercompany receivables, net	—		—		2,403,704			(2,403,704		)	—
Property, buildings and equipment, net	—		63,506		97,372			—			160,878
Intangible assets, net	—		2,131		313,885			—			316,016
Goodwill	—		257,623		1,464,980			—			1,722,603
Investments in affiliates	3,182,469		5,137,783		—			(8,320,252		)	—
Other assets	—		2,905		16,994			—			19,899
Total assets	$	3,183,592	$	5,997,887	$	6,156,781		$	(10,733,224	)	$	4,605,036
Accounts payable	$	—	$	404,373	$	389,975		$	—		$	794,348
Short-term debt	—		—		30,785			—			30,785
Other current liabilities	—		86,600		159,481			(9,268		)	236,813
Total current liabilities	—		490,973		580,241			(9,268		)	1,061,946
Intercompany payables, net	1,048,282		1,355,422		—			(2,403,704		)	—
Long-term debt, net	—		842,093		325,218			—			1,167,311
Other noncurrent liabilities	—		126,930		119,123			—			246,053
Total WESCO International stockholders' equity	2,135,310		3,182,469		5,137,783			(8,320,252		)	2,135,310
Noncontrolling interests	—		—		(5,584		)	—			(5,584		)
Total liabilities and stockholders’ equity	$	3,183,592	$	5,997,887	$	6,156,781		$	(10,733,224	)	$	4,605,036

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OTHER FINANCIAL INFORMATION Condensed Income Statement (Tables)

6 Months Ended

Jun. 30, 2019

Condensed Income Statements, Captions [Line Items]

Condensed Income Statement [Table Text Block]

	Condensed Consolidating Statement of Income and Comprehensive Income
	Three Months Ended
	June 30, 2018
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	921,075		$	1,222,369		$	(39,450	)	$	2,103,994
Cost of goods sold (excluding depreciation and
amortization)	—			746,373			997,177			(39,450		)	1,704,100
Selling, general and administrative expenses	—			147,566			145,322			—			292,888
Depreciation and amortization	—			4,656			11,167			—			15,823
Results of affiliates’ operations	57,673			51,122			—			(108,795		)	—
Net interest and other	—			14,259			3,482			—			17,741
Income tax expense	—			1,670			14,099			—			15,769
Net income	57,673			57,673			51,122			(108,795		)	57,673
Net loss attributable to noncontrolling interests	—			—			(267		)	—			(267		)
Net income attributable to WESCO International	$	57,673		$	57,673		$	51,389		$	(108,795	)	$	57,940
Other comprehensive loss:
Foreign currency translation adjustments	(28,715		)	(28,715		)	(28,715		)	57,430			(28,715		)
Comprehensive income attributable to WESCO International	$	28,958		$	28,958		$	22,674		$	(51,365	)	$	29,225

	Condensed Consolidating Statement of Income and Comprehensive Income
	Six Months Ended
	June 30, 2018
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—		$	1,803,474		$	2,372,479		$	(78,044	)	$	4,097,909
Cost of goods sold (excluding depreciation and
amortization)	—			1,462,631			1,933,479			(78,044		)	3,318,066
Selling, general and administrative expenses	—			298,047			285,670			—			583,717
Depreciation and amortization	—			9,275			22,428			—			31,703
Results of affiliates’ operations	100,644			96,325			—			(196,969		)	—
Net interest and other	—			28,076			9,448			—			37,524
Income tax expense	—			1,126			25,129			—			26,255
Net income	100,644			100,644			96,325			(196,969		)	100,644
Net loss attributable to noncontrolling interests	—			—			(1,717		)	—			(1,717		)
Net income attributable to WESCO International	$	100,644		$	100,644		$	98,042		$	(196,969	)	$	102,361
Other comprehensive loss:
Foreign currency translation adjustments	(57,515		)	(57,515		)	(57,515		)	115,030			(57,515		)
Comprehensive income attributable to WESCO International	$	43,129		$	43,129		$	40,527		$	(81,939	)	$	44,846

	Condensed Consolidating Statement of Income and Comprehensive Income
	Six Months Ended
	June 30, 2019
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	1,796,315	$	2,398,346		$	(83,306	)	$	4,111,355
Cost of goods sold (excluding depreciation and
amortization)	—		1,452,592		1,950,600			(83,306		)	3,319,886
Selling, general and administrative expenses	—		298,562		293,808			—			592,370
Depreciation and amortization	—		9,027		21,397			—			30,424
Results of affiliates’ operations	105,164		96,375		—			(201,539		)	—
Net interest and other	—		24,914		9,513			—			34,427
Income tax expense	—		2,431		26,653			—			29,084
Net income	105,164		105,164		96,375			(201,539		)	105,164
Net loss attributable to noncontrolling interests	—		—		(668		)	—			(668		)
Net income attributable to WESCO International	$	105,164	$	105,164	$	97,043		$	(201,539	)	$	105,832
Other comprehensive income:
Foreign currency translation adjustments	42,763		42,763		42,763			(85,526		)	42,763
Comprehensive income attributable to WESCO International	$	147,927	$	147,927	$	139,806		$	(287,065	)	$	148,595

	Condensed Consolidating Statement of Income and Comprehensive Income
	Three Months Ended
	June 30, 2019
(In thousands)	WESCO International, Inc.		WESCO Distribution, Inc.		Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net sales	$	—	$	938,333	$	1,255,952		$	(44,197	)	$	2,150,088
Cost of goods sold (excluding depreciation and
amortization)	—		763,036		1,022,275			(44,197		)	1,741,114
Selling, general and administrative expenses	—		146,133		149,709			—			295,842
Depreciation and amortization	—		4,471		10,711			—			15,182
Results of affiliates’ operations	63,215		53,962		—			(117,177		)	—
Net interest and other	—		12,880		4,427			—			17,307
Income tax expense	—		2,560		14,868			—			17,428
Net income	63,215		63,215		53,962			(117,177		)	63,215
Net loss attributable to noncontrolling interests	—		—		(249		)	—			(249		)
Net income attributable to WESCO International	$	63,215	$	63,215	$	54,211		$	(117,177	)	$	63,464
Other comprehensive income:
Foreign currency translation adjustments	20,244		20,244		20,244			(40,488		)	20,244
Comprehensive income attributable to WESCO International	$	83,459	$	83,459	$	74,455		$	(157,665	)	$	83,708

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OTHER FINANCIAL INFORMATION Condensed Cash Flow Statement (Tables)

6 Months Ended

Jun. 30, 2019

Condensed Cash Flow Statements, Captions [Line Items]

Condensed Cash Flow Statement [Table Text Block]

	Condensed Consolidating Statement of Cash Flows
	Six Months Ended
	June 30, 2019
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash provided by (used in) operating activities	$	4,904		$	128,070		$	(141,749	)	$	—		$	(8,775	)
Investing activities:
Capital expenditures	—			(5,843		)	(15,559		)	—			(21,402		)
Acquisition payments	—			(27,742		)	—			—			(27,742		)
Dividends received from subsidiaries	—			44,417			—			(44,417		)	—
Other	—			(192,235		)	(1,155		)	192,235			(1,155		)
Net cash used in investing activities	—			(181,403		)	(16,714		)	147,818			(50,299		)
Financing activities:
Borrowings	147,818			242,134			720,657			(192,235		)	918,374
Repayments	—			(193,134		)	(525,306		)	—			(718,440		)
Repurchases of common stock	(152,722		)	—			—			—			(152,722		)
Dividends paid by subsidiaries	—			—			(44,417		)	44,417			—
Other	—			2,803			—			—			2,803
Net cash (used in) provided by financing activities	(4,904		)	51,803			150,934			(147,818		)	50,015
Effect of exchange rate changes on cash and cash equivalents	—			—			(66		)	—			(66		)
Net change in cash and cash equivalents	—			(1,530		)	(7,595		)	—			(9,125		)
Cash and cash equivalents at the beginning of period	—			35,931			60,412			—			96,343
Cash and cash equivalents at the end of period	$	—		$	34,401		$	52,817		$	—		$	87,218

	Condensed Consolidating Statement of Cash Flows
	Six Months Ended
	June 30, 2018
(In thousands)	WESCO International, Inc.			WESCO Distribution, Inc.			Non-Guarantor Subsidiaries			Consolidating and Eliminating Entries			Consolidated
Net cash provided by operating activities	$	9,878		$	31,192		$	45,751		$	—		$	86,821
Investing activities:
Capital expenditures	—			(9,334		)	(7,050		)	—			(16,384		)
Dividends received from subsidiaries	—			95,511			—			(95,511		)	—
Other	—			(37,524		)	(8,684		)	37,524			(8,684		)
Net cash provided by (used in) investing activities	—			48,653			(15,734		)	(57,987		)	(25,068		)
Financing activities:
Borrowings	—			191,888			736,372			(45,511		)	882,749
Repayments	(7,987		)	(260,888		)	(673,761		)	7,987			(934,649		)
Repurchases of common stock	(1,891		)	—			—			—			(1,891		)
Dividends paid by subsidiaries	—			—			(95,511		)	95,511			—
Other	—			(9,958		)	—			—			(9,958		)
Net cash used in financing activities	(9,878		)	(78,958		)	(32,900		)	57,987			(63,749		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(5,017		)	—			(5,017		)
Net change in cash and cash equivalents	—			887			(7,900		)	—			(7,013		)
Cash and cash equivalents at the beginning of period	—			50,602			67,351			—			117,953
Cash and cash equivalents at the end of period	$	—		$	51,489		$	59,451		$	—		$	110,940

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GOODWILL (Tables)

6 Months Ended

Jun. 30, 2019

Goodwill [Line Items]

Schedule of Goodwill [Table Text Block]

	Six Months Ended
	June 30
(In thousands)	2019
Beginning balance January 1	$	1,722,603
Foreign currency exchange rate changes	24,251
Additions to goodwill for acquisitions	5,946
Ending balance June 30	$	1,752,800

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REVENUE (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following tables disaggregate WESCO’s revenue by end market and geography:

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands)	2019		2018		2019		2018
Industrial	$	761,934	$	760,741	$	1,498,825	$	1,519,723
Construction	704,183		683,752		1,337,483		1,321,551
Utility	346,941		336,961		655,213		652,506
Commercial, Institutional and Government	337,030		322,540		619,834		604,129
Total by end market	$	2,150,088	$	2,103,994	$	4,111,355	$	4,097,909

	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands)	2019		2018		2019		2018
United States	$	1,616,347	$	1,563,392	$	3,077,263	$	3,046,140
Canada (1)	415,030		405,981		799,700		804,689
Other International (1)	118,711		134,621		234,392		247,080
Total by geography	$	2,150,088	$	2,103,994	$	4,111,355	$	4,097,909

⁽¹⁾ 

The prior period has been reclassified to conform to the current period presentation.

Revenue Recognition, Revenue Reductions [Policy Text Block]

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 anticipated performance, historical data, as well as current and forecasted information. Measurement and recognition of variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended June 30, 2019 and 2018 by approximately $28.5 million and $25.0 million, respectively, and by approximately $53.8 million and $49.4 million for the six months ended June 30, 2019 and 2018, respectively.

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LEASES (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Lease, Cost [Table Text Block]

	Three Months Ended		Six Months Ended
	June 30		June 30
(In thousands)	2019		2019
Operating lease cost	$	18,285	$	36,274
Short-term lease cost	22		33
Variable lease cost	6,463		11,784
Total lease cost	$	24,770	$	48,091

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

	(In thousands)
2019	$	36,218
2020	64,614
2021	53,127
2022	39,774
2023	30,201
Thereafter	47,550
Total undiscounted operating lease payments	271,484
Less: interest	(33,283		)
Total operating lease liabilities	$	238,201

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Years ending December 31	(In thousands)
2019	$	71,640
2020	59,594
2021	47,264
2022	34,490
2023	24,493
Thereafter	40,302

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ORGANIZATION (Details)	Jun. 30, 2019 customers countries branches
Restructuring Cost and Reserve [Line Items]
Active customers (in customers) | customers	70,000
Full service branches (in branches) | branches	500
Additional countries (in countries) | countries	15

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ORGANIZATION Organization (Details)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Distribution Centers	10

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ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Prepaid expenses and other current assets	$ 72,284		$ 76,980
Assets, Current	2,584,864		2,385,640
Goodwill	1,752,800		1,722,603
Liabilities and Equity	5,067,936		4,605,036
Other Accrued Liabilities, Current	152,712		105,461
Liabilities, Current	1,124,832		1,061,946
Assets	5,067,936		4,605,036
Deferred Tax Liabilities, Net, Noncurrent	147,306		143,967
Liabilities	2,933,113		2,475,310
Retained earnings	2,412,768	$ 2,349,300	2,307,462	$ 2,182,486	$ 2,124,535	$ 2,079,697
Accumulated other comprehensive income	(365,674)	$ (385,918)	(408,435)	$ (370,105)	$ (341,390)	$ (312,590)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,134,823		$ 2,129,726

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ACQUISITIONS - ACQUISITIONS (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) branches	Jun. 30, 2018 USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 36,188
Business Acquisition, Effective Date of Acquisition	Mar. 05, 2019
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period	$ 100,000
Goodwill, Acquired During Period	$ 5,946
Number of Stores | branches	500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 8,446
Payments to Acquire Businesses, Gross	$ 27,742	$ 0

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SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 54.63
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 6,739		$ 6,739
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 59.73		$ 59.73		$ 59.26
Share-based Compensation Arrangement By Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding [Roll Forward]
Beginning of Year (in shares)	1,749,679		1,749,679
Grants in Period (in shares)	0	8,402	213,618	499,631
Exercises in Period (in shares)			106,044
Forfeitures in Period (in shares)			44,877
Weighted Average Exercise Price, Exercises in Period (in dollars per share)			$ 34.70
Weighted Average Exercise Price, Forfeitures in Period (in dollars per share)			70.10
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 59.01		$ 59.01
Weighted Average Remaining Contractual Term, Outstanding (in years)			6 years 2 months 12 days
Weighted Average Remaining Contractual Term, Exercisable (in years)			5 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding	$ 6,739		$ 6,739
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	2,414,330		2,414,330		2,351,633

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SCHEDULE OF SHARE-BASED PAYMENT AWARD, VALUATION ASSUMPTIONS (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate		2.80%	2.50%	2.50%
Expected life (in years)		5 years	5 years	5 years
WESCO expected volatility		28.00%	29.00%	28.00%
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	8,402	213,618	499,631
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0	$ 17.85	$ 16.36	$ 18.39
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	2,502	175,544	116,771
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0	$ 59.95	$ 54.64	$ 62.75
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0	0	126,874	44,144
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0	$ 0	$ 54.64	$ 62.80

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SUMMARY OF RESTRICTED STOCK UNITS (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	383,547		383,547		327,798
Granted (in shares)	0	2,502	175,544	116,771
Vested (in shares)			(116,858)
Forfeited (in shares)			(2,937)
Unvested, Weighted Average Fair Value (in dollars per share)	$ 60.46		$ 60.46		$ 57.87
Granted, Weighted Average Fair Value (in dollars per share)	$ 0	$ 59.95	54.64	$ 62.75
Vested in Period, Weighted Average Fair Value (in dollars per share)			44.32
Forfeited in Period, Weighted Average Fair Value (in dollars per share)			$ 56.16

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SUMMARY OF PERFORMANCE-BASED AWARDS (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	204,588		204,588		138,896
Granted (in shares)	0	0	126,874	44,144
Vested (in shares)			(25,696)
Forfeited (in shares)			(35,486)
Unvested, Weighted Average Fair Value (in dollars per share)	$ 60.11		$ 60.11		$ 59.33
Granted, Weighted Average Fair Value (in dollars per share)	$ 0	$ 0	54.64	$ 62.80
Vested in Period, Weighted Average Fair Value (in dollars per share)			42.44
Forfeited in Period, Weighted Average Fair Value (in dollars per share)			$ 50.79
Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	187,081		187,081
Share-based Compensation Award, Tranche Two [Member] | Net Income Growth Rate [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	80,944		80,944
Share-based Compensation Award, Tranche Two [Member] | Earnings Per Share Growth [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	84,787		84,787
Share-based Compensation Award, Tranche Two [Member] | Return on Net Assets [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested (in shares)	21,350		21,350

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SCHEDULE OF SHARE-BASED PAYMENT AWARD, PERFORMANCE-BASED AWARDS, VALUATION ASSUMPTIONS (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
WESCO expected volatility	28.00%	29.00%	28.00%
Risk free interest rate	2.80%	2.50%	2.50%

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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 5.2	$ 4.4		$ 9.8	$ 8.0
Total unrecognized compensation cost	$ 31.4			$ 31.4
Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based awards outstanding (in shares)	17,507			17,507
Performance-based Awards - Peer Group Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based awards outstanding (in shares)	187,081			187,081
Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 10.2			$ 0.7	$ 7.0	$ 13.5

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SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to WESCO International, Inc.	$ 63,464	$ 42,369	$ 57,940	$ 44,421	$ 105,832	$ 102,361
Weighted average common shares outstanding used in computing basic earnings per share (in shares)	43,493		47,085		44,280	47,062
Common shares issuable upon exercise of dilutive stock options (in shares)	323		465		381	516
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares)	43,816		47,550		44,661	47,578
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 1.46		$ 1.23		$ 2.39	$ 2.18
Diluted (in dollars per share)	$ 1.45		$ 1.22		$ 2.37	$ 2.15

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EARNINGS PER SHARE (Details) - shares shares in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Equity Award [Domain]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1.8	1.5

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EARNINGS PER SHARE Accelerated Share Repurchase (Details) - USD ($) $ in Thousands	3 Months Ended		4 Months Ended	6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Mar. 07, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Accelerated Share Repurchases [Line Items]
Payments for Repurchase of Common Stock				$ (152,722)	$ (1,891)
Stock Repurchase Program, Authorized Amount						$ 400,000	$ 300,000
Treasury Stock, Shares, Acquired	2,394,816	365,272	365,272	2,760,088
Stock Repurchase Program Expiration Date				Dec. 31, 2020
Treasury Stock, Common [Member]
Accelerated Share Repurchases [Line Items]
Payments for Repurchase of Common Stock	$ (150,000)

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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Retirement Benefits [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 100		$ 200
Schedule of Employee Benefit Plans [Line Items]
Defined Benefit Plan, Service Cost	1,139	$ 1,312	2,288	$ 2,659
Postemployment Benefits, Period Expense			18,900	$ 21,900
Deferred Compensation Liability, Classified, Noncurrent	$ 23,700		$ 23,700		$ 21,900
CANADA | Minimum [Member]
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan Employer Matching Contribution Percent			3.00%
CANADA | Maximum [Member]
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan Employer Matching Contribution Percent			5.00%
UNITED STATES
Schedule of Employee Benefit Plans [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			50.00%
Defined Contribution Plan Employer Matching Contribution Percent			6.00%

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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 100		$ 200
Service cost	1,139	$ 1,312	2,288	$ 2,659
Interest cost	1,080	1,039	2,169	2,105
Expected return on plan assets	(1,410)	(1,500)	(2,832)	(3,040)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(15)	(12)	(31)	(24)
Net periodic benefit cost	794	839	1,594	1,700
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Nonoperating Gains (Losses)	$ (300)	$ (500)	$ (700)	$ (1,000)

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COMMITMENTS AND CONTINGENCIES Guarantees (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Guarantees and Product Warranties [Abstract]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 6.8
Guarantor Obligations, Origin and Purpose	Due to the nature of WESCO’s arrangement with WESTEC, WESCO has provided a standby letter of credit under its revolving credit facility of up to $7.3 million as security for WESTEC’s line of credit.

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INCOME TAXES (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Contingency [Line Items]
Effective tax rate	21.60%	21.50%	21.70%	20.70%

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INCOME TAXES Income Tax Rates (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	21.60%	21.50%	21.70%	20.70%

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OTHER FINANCIAL INFORMATION (Details) - Unsecured Debt [Member] $ in Millions	Jun. 30, 2019 USD ($)
2021 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500
2024 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350

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CONDENSED CONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Condensed Financial Information [Line Items]
Cash and cash equivalents	$ 87,218		$ 96,343	$ 110,940		$ 117,953
Trade accounts receivable, net	1,355,541		1,166,607
Inventories, net	1,004,127		948,726
Prepaid Expense and Other Assets, Current	72,284		76,980
Total current assets	2,584,864		2,385,640
Property, buildings and equipment, net	172,359		160,878
Operating Lease, Right-of-Use Asset	233,403		0
Intangible assets, net	304,392		316,016
Goodwill and other intangibles, net	1,752,800		1,722,603
Other assets	20,118		19,899
Total assets	5,067,936		4,605,036
Accounts payable	868,605		794,348
Short-term debt	27,217		30,785
Total current liabilities	1,124,832		1,061,946
Long-term Debt, Excluding Current Maturities	1,399,486		1,167,311
Operating Lease, Liability, Noncurrent	177,907		0
Total stockholders' equity	2,141,075		2,135,310
Stockholders' Equity Attributable to Noncontrolling Interest	6,252	$ 6,003	5,584	5,313	$ 5,046	3,596
Total liabilities and stockholders' equity	5,067,936		4,605,036
Parent Company [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	0		0	0		0
Trade accounts receivable, net	0		0
Inventories, net	0		0
Prepaid Expense and Other Assets, Current	1,123		1,123
Total current assets	1,123		1,123
Intercompany receivables, net	0		0
Property, buildings and equipment, net	0		0
Operating Lease, Right-of-Use Asset	0
Intangible assets, net	0		0
Goodwill and other intangibles, net	0		0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,336,052		3,182,469
Other assets	0		0
Total assets	3,337,175		3,183,592
Accounts payable	0		0
Short-term debt	0		0
Other Liabilities, Current	0		0
Total current liabilities	0		0
Intercompany payables, net	1,196,100		1,048,282
Long-term Debt, Excluding Current Maturities	0		0
Operating Lease, Liability, Noncurrent	0
Liabilities, Other than Long-term Debt, Noncurrent	0		0
Total stockholders' equity	2,141,075		2,135,310
Stockholders' Equity Attributable to Noncontrolling Interest	0		0
Total liabilities and stockholders' equity	3,337,175		3,183,592
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	34,401		35,931	51,489		50,602
Trade accounts receivable, net	0		0
Inventories, net	455,898		440,422
Prepaid Expense and Other Assets, Current	17,703		57,586
Total current assets	508,002		533,939
Intercompany receivables, net	0		0
Property, buildings and equipment, net	73,401		63,506
Operating Lease, Right-of-Use Asset	139,468
Intangible assets, net	1,816		2,131
Goodwill and other intangibles, net	257,623		257,623
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	5,276,915		5,137,783
Other assets	2,597		2,905
Total assets	6,259,822		5,997,887
Accounts payable	418,469		404,373
Short-term debt	0		0
Other Liabilities, Current	66,660		86,600
Total current liabilities	485,129		490,973
Intercompany payables, net	1,325,247		1,355,422
Long-term Debt, Excluding Current Maturities	892,909		842,093
Operating Lease, Liability, Noncurrent	110,360
Liabilities, Other than Long-term Debt, Noncurrent	110,125		126,930
Total stockholders' equity	3,336,052		3,182,469
Stockholders' Equity Attributable to Noncontrolling Interest	0		0
Total liabilities and stockholders' equity	6,259,822		5,997,887
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	52,817		60,412	59,451		67,351
Trade accounts receivable, net	1,355,541		1,166,607
Inventories, net	548,229		508,304
Prepaid Expense and Other Assets, Current	121,956		124,523
Total current assets	2,078,543		1,859,846
Intercompany receivables, net	2,521,347		2,403,704
Property, buildings and equipment, net	98,958		97,372
Operating Lease, Right-of-Use Asset	93,935
Intangible assets, net	302,576		313,885
Goodwill and other intangibles, net	1,495,177		1,464,980
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0		0
Other assets	17,521		16,994
Total assets	6,608,057		6,156,781
Accounts payable	450,136		389,975
Short-term debt	27,217		30,785
Other Liabilities, Current	165,154		159,481
Total current liabilities	642,507		580,241
Intercompany payables, net	0		0
Long-term Debt, Excluding Current Maturities	506,577		325,218
Operating Lease, Liability, Noncurrent	67,547
Liabilities, Other than Long-term Debt, Noncurrent	120,763		119,123
Total stockholders' equity	5,276,915		5,137,783
Stockholders' Equity Attributable to Noncontrolling Interest	6,252		5,584
Total liabilities and stockholders' equity	6,608,057		6,156,781
Consolidated Entities [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	87,218		96,343	110,940		117,953
Trade accounts receivable, net	1,355,541		1,166,607
Inventories, net	1,004,127		948,726
Prepaid Expense and Other Assets, Current	137,978		173,964
Total current assets	2,584,864		2,385,640
Intercompany receivables, net	0		0
Property, buildings and equipment, net	172,359		160,878
Operating Lease, Right-of-Use Asset	233,403
Intangible assets, net	304,392		316,016
Goodwill and other intangibles, net	1,752,800		1,722,603
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0		0
Other assets	20,118		19,899
Total assets	5,067,936		4,605,036
Accounts payable	868,605		794,348
Short-term debt	27,217		30,785
Other Liabilities, Current	229,010		236,813
Total current liabilities	1,124,832		1,061,946
Intercompany payables, net	0		0
Long-term Debt, Excluding Current Maturities	1,399,486		1,167,311
Operating Lease, Liability, Noncurrent	177,907
Liabilities, Other than Long-term Debt, Noncurrent	230,888		246,053
Total stockholders' equity	2,141,075		2,135,310
Stockholders' Equity Attributable to Noncontrolling Interest	6,252		5,584
Total liabilities and stockholders' equity	5,067,936		4,605,036
Consolidation, Eliminations [Member]
Condensed Financial Information [Line Items]
Cash and cash equivalents	0		0	$ 0		$ 0
Trade accounts receivable, net	0		0
Inventories, net	0		0
Prepaid Expense and Other Assets, Current	(2,804)		(9,268)
Total current assets	(2,804)		(9,268)
Intercompany receivables, net	(2,521,347)		(2,403,704)
Property, buildings and equipment, net	0		0
Operating Lease, Right-of-Use Asset	0
Intangible assets, net	0		0
Goodwill and other intangibles, net	0		0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(8,612,967)		(8,320,252)
Other assets	0		0
Total assets	(11,137,118)		(10,733,224)
Accounts payable	0		0
Short-term debt	0		0
Other Liabilities, Current	(2,804)		(9,268)
Total current liabilities	(2,804)		(9,268)
Intercompany payables, net	(2,521,347)		(2,403,704)
Long-term Debt, Excluding Current Maturities	0		0
Operating Lease, Liability, Noncurrent	0
Liabilities, Other than Long-term Debt, Noncurrent	0		0
Total stockholders' equity	(8,612,967)		(8,320,252)
Stockholders' Equity Attributable to Noncontrolling Interest	0		0
Total liabilities and stockholders' equity	$ (11,137,118)		$ (10,733,224)

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CONDENSED CONSOLIDATED INCOME STATEMENTS (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Information [Line Items]
Revenues	$ 2,150,088		$ 2,103,994		$ 4,111,355	$ 4,097,909
Cost of goods sold	1,741,114		1,704,100		3,319,886	3,318,066
Selling, general and administrative expense	295,842		292,888		592,370	583,717
Depreciation and amortization	15,182		15,823		30,424	31,703
Provision for income taxes	17,428		15,769		29,084	26,255
Net income (loss)	63,215		57,673		105,164	100,644
Less: Net (loss) income attributable to noncontrolling interest	(249)		(267)		(668)	(1,717)
Net income (loss) attributable to WESCO International, Inc.	63,464	$ 42,369	57,940	$ 44,421	105,832	102,361
Comprehensive Income:
Foreign currency translation adjustment	20,244		(28,715)		42,763	(57,515)
Comprehensive income attributable to WESCO International, Inc.	83,708		29,225		148,595	44,846
Parent Company [Member]
Condensed Financial Information [Line Items]
Revenues	0		0		0	0
Cost of goods sold	0		0		0	0
Selling, general and administrative expense	0		0		0	0
Depreciation and amortization	0		0		0	0
Income (Loss) from Subsidiaries, before Tax	63,215		57,673		105,164	100,644
Other Nonoperating Income (Expense)	0		0		0	0
Provision for income taxes	0		0		0	0
Net income (loss)	63,215		57,673		105,164	100,644
Less: Net (loss) income attributable to noncontrolling interest	0		0		0	0
Net income (loss) attributable to WESCO International, Inc.	63,215		57,673		105,164	100,644
Comprehensive Income:
Foreign currency translation adjustment	20,244		(28,715)		42,763	(57,515)
Comprehensive income attributable to WESCO International, Inc.	83,459		28,958		147,927	43,129
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Revenues	1,255,952		1,222,369		2,398,346	2,372,479
Cost of goods sold	1,022,275		997,177		1,950,600	1,933,479
Selling, general and administrative expense	149,709		145,322		293,808	285,670
Depreciation and amortization	10,711		11,167		21,397	22,428
Income (Loss) from Subsidiaries, before Tax	0		0		0	0
Other Nonoperating Income (Expense)	4,427		3,482		9,513	9,448
Provision for income taxes	14,868		14,099		26,653	25,129
Net income (loss)	53,962		51,122		96,375	96,325
Less: Net (loss) income attributable to noncontrolling interest	(249)		(267)		(668)	(1,717)
Net income (loss) attributable to WESCO International, Inc.	54,211		51,389		97,043	98,042
Comprehensive Income:
Foreign currency translation adjustment	20,244		(28,715)		42,763	(57,515)
Comprehensive income attributable to WESCO International, Inc.	74,455		22,674		139,806	40,527
Consolidated Entities [Member]
Condensed Financial Information [Line Items]
Revenues	2,150,088		2,103,994		4,111,355	4,097,909
Cost of goods sold	1,741,114		1,704,100		3,319,886	3,318,066
Selling, general and administrative expense	295,842		292,888		592,370	583,717
Depreciation and amortization	15,182		15,823		30,424	31,703
Income (Loss) from Subsidiaries, before Tax	0		0		0	0
Other Nonoperating Income (Expense)	(17,307)		(17,741)		(34,427)	(37,524)
Provision for income taxes	17,428		15,769		29,084	26,255
Net income (loss)	63,215		57,673		105,164	100,644
Less: Net (loss) income attributable to noncontrolling interest	(249)		(267)		(668)	(1,717)
Net income (loss) attributable to WESCO International, Inc.	63,464		57,940		105,832	102,361
Comprehensive Income:
Foreign currency translation adjustment	20,244		(28,715)		42,763	(57,515)
Comprehensive income attributable to WESCO International, Inc.	83,708		29,225		148,595	44,846
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Revenues	938,333		921,075		1,796,315	1,803,474
Cost of goods sold	763,036		746,373		1,452,592	1,462,631
Selling, general and administrative expense	146,133		147,566		298,562	298,047
Depreciation and amortization	4,471		4,656		9,027	9,275
Income (Loss) from Subsidiaries, before Tax	53,962		51,122		96,375	96,325
Other Nonoperating Income (Expense)	(12,880)		(14,259)		(24,914)	(28,076)
Provision for income taxes	2,560		1,670		2,431	1,126
Net income (loss)	63,215		57,673		105,164	100,644
Less: Net (loss) income attributable to noncontrolling interest	0		0		0	0
Net income (loss) attributable to WESCO International, Inc.	63,215		57,673		105,164	100,644
Comprehensive Income:
Foreign currency translation adjustment	20,244		(28,715)		42,763	(57,515)
Comprehensive income attributable to WESCO International, Inc.	83,459		28,958		147,927	43,129
Consolidation, Eliminations [Member]
Condensed Financial Information [Line Items]
Revenues	(44,197)		(39,450)		(83,306)	(78,044)
Cost of goods sold	(44,197)		(39,450)		(83,306)	(78,044)
Selling, general and administrative expense	0		0		0	0
Depreciation and amortization	0		0		0	0
Income (Loss) from Subsidiaries, before Tax	(117,177)		(108,795)		(201,539)	(196,969)
Other Nonoperating Income (Expense)	0		0		0	0
Provision for income taxes	0		0		0	0
Net income (loss)	(117,177)		(108,795)		(201,539)	(196,969)
Less: Net (loss) income attributable to noncontrolling interest	0		0		0	0
Net income (loss) attributable to WESCO International, Inc.	(117,177)		(108,795)		(201,539)	(196,969)
Comprehensive Income:
Foreign currency translation adjustment	(40,488)		57,430		(85,526)	115,030
Comprehensive income attributable to WESCO International, Inc.	(157,665)		(51,365)		(287,065)	(81,939)
Pension Plan [Member]
Condensed Financial Information [Line Items]
Other Nonoperating Gains (Losses)	$ (300)		$ (500)		$ (700)	$ (1,000)

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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	$ (1,155)	$ (8,684)
Net cash (used) provided by operating activities	(8,775)	86,821
Payments to Acquire Businesses, Gross	27,742	0
Investing Activities:
Capital expenditures	(21,402)	(16,384)
Net cash used in investing activities	(50,299)	(25,068)
Financing Activities:
Proceeds from (Repayments of) Bank Overdrafts	14,676	(9,408)
Payments for Repurchase of Common Stock	(152,722)	(1,891)
Proceeds from (Payments for) Other Financing Activities	(472)	(550)
Net cash used in financing activities	50,015	(63,749)
Effect of exchange rate changes on cash and cash equivalents	(66)	(5,017)
Net change in cash and cash equivalents	(9,125)	(7,013)
Cash and cash equivalents at the beginning of period	96,343	117,953
Cash and cash equivalents at the end of period	87,218	110,940
Parent Company [Member]
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	0	0
Net cash (used) provided by operating activities	4,904	9,878
Payments to Acquire Businesses, Gross	0
Investing Activities:
Capital expenditures	0	0
Proceeds from Dividends Received	0	0
Net cash used in investing activities	0	0
Financing Activities:
Borrowings	147,818	0
Repayments	0	(7,987)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees	0	0
Payments for Repurchase of Common Stock	(152,722)	1,891
Proceeds from (Payments for) Other Financing Activities	0	0
Net cash used in financing activities	(4,904)	(9,878)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at the beginning of period	0	0
Cash and cash equivalents at the end of period	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	(192,235)	(37,524)
Net cash (used) provided by operating activities	128,070	31,192
Payments to Acquire Businesses, Gross	(27,742)
Investing Activities:
Capital expenditures	(5,843)	(9,334)
Proceeds from Dividends Received	44,417	95,511
Net cash used in investing activities	(181,403)	48,653
Financing Activities:
Borrowings	242,134	191,888
Repayments	(193,134)	(260,888)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees	0	0
Payments for Repurchase of Common Stock		0
Payments for Repurchase of Private Placement	0
Proceeds from (Payments for) Other Financing Activities	2,803	(9,958)
Net cash used in financing activities	51,803	(78,958)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	(1,530)	887
Cash and cash equivalents at the beginning of period	35,931	50,602
Cash and cash equivalents at the end of period	34,401	51,489
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	(1,155)	(8,684)
Net cash (used) provided by operating activities	(141,749)	45,751
Payments to Acquire Businesses, Gross	0
Investing Activities:
Capital expenditures	(15,559)	(7,050)
Proceeds from Dividends Received	0	0
Net cash used in investing activities	(16,714)	(15,734)
Financing Activities:
Borrowings	720,657	736,372
Repayments	(525,306)	(673,761)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees	(44,417)	(95,511)
Payments for Repurchase of Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	0	0
Net cash used in financing activities	150,934	(32,900)
Effect of exchange rate changes on cash and cash equivalents	(66)	(5,017)
Net change in cash and cash equivalents	(7,595)	(7,900)
Cash and cash equivalents at the beginning of period	60,412	67,351
Cash and cash equivalents at the end of period	52,817	59,451
Consolidated Entities [Member]
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	(1,155)	(8,684)
Net cash (used) provided by operating activities	(8,775)	86,821
Payments to Acquire Businesses, Gross	(27,742)
Investing Activities:
Capital expenditures	(21,402)	(16,384)
Proceeds from Dividends Received	0	0
Net cash used in investing activities	(50,299)	(25,068)
Financing Activities:
Borrowings	918,374	882,749
Repayments	(718,440)	(934,649)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees	0	0
Payments for Repurchase of Common Stock	152,722	1,891
Proceeds from (Payments for) Other Financing Activities	2,803	(9,958)
Net cash used in financing activities	50,015	(63,749)
Effect of exchange rate changes on cash and cash equivalents	(66)	(5,017)
Net change in cash and cash equivalents	(9,125)	(7,013)
Cash and cash equivalents at the beginning of period	96,343	117,953
Cash and cash equivalents at the end of period	87,218	110,940
Consolidation, Eliminations [Member]
Condensed Financial Information [Line Items]
Payments for (Proceeds from) Other Investing Activities	192,235	37,524
Net cash (used) provided by operating activities	0	0
Payments to Acquire Businesses, Gross	0
Investing Activities:
Capital expenditures	0	0
Proceeds from Dividends Received	(44,417)	(95,511)
Net cash used in investing activities	147,818	(57,987)
Financing Activities:
Borrowings	(192,235)	(45,511)
Repayments	0	(7,987)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees	(44,417)	(95,511)
Payments for Repurchase of Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	0	0
Net cash used in financing activities	(147,818)	57,987
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at the beginning of period	0	0
Cash and cash equivalents at the end of period	$ 0	$ 0

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Subsequent Events (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Subsequent Event [Line Items]
Business Acquisition, Effective Date of Acquisition	Mar. 05, 2019
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period	$ 100

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GOODWILL (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill	$ 1,752,800	$ 1,722,603
Goodwill, Foreign Currency Translation Gain (Loss)	24,251
Goodwill, Acquired During Period	$ 5,946

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REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Deferred Revenue	$ 10,400		$ 10,400		$ 11,800
Revenue from Contract with Customer, Excluding Assessed Tax	2,150,088	$ 2,103,994	4,111,355	$ 4,097,909
Cost of goods sold	1,741,114	1,704,100	3,319,886	3,318,066
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	761,934	760,741	1,498,825	1,519,723
Construction [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	704,183	683,752	1,337,483	1,321,551
Utility [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	346,941	336,961	655,213	652,506
Commercial, Institutional and Government [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	337,030	322,540	619,834	604,129
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,616,347	1,563,392	3,077,263	3,046,140
CANADA
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	415,030	405,981	799,700	804,689
Non-US [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	118,711	134,621	234,392	247,080
Shipping and Handling [Member]
Disaggregation of Revenue [Line Items]
Cost of goods sold	$ 18,200	$ 18,600	$ 35,200	$ 36,800

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REVENUE Deferred Revenue (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Deferred Revenue	$ 10.4	$ 11.8

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REVENUE Shipping and Handling Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Cost of goods sold	$ 1,741,114	$ 1,704,100	$ 3,319,886	$ 3,318,066
Shipping and Handling [Member]
Cost of goods sold	$ 18,200	$ 18,600	$ 35,200	$ 36,800

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REVENUE Variable Consideration (Details)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue Recognition, Revenue Reductions [Policy Text Block]

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 anticipated performance, historical data, as well as current and forecasted information. Measurement and recognition of variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended June 30, 2019 and 2018 by approximately $28.5 million and $25.0 million, respectively, and by approximately $53.8 million and $49.4 million for the six months ended June 30, 2019 and 2018, respectively.

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LEASES (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 36,218	$ 36,218
Operating Leases, Future Minimum Payments Due, Next Twelve Months			$ 71,640
Operating Lease, Weighted Average Remaining Lease Term	5 years 6 months	5 years 6 months
Operating Lease, Right-of-Use Asset	$ 233,403	$ 233,403	0
Operating Lease, Cost	18,285	36,274
Operating Lease, Payments		32,214
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		26,731
Short-term Lease, Cost	22	33
Variable Lease, Cost	6,463	11,784
Lease, Cost	24,770	48,091
Operating Lease, Liability, Current	60,294	60,294
Operating Lease, Liability, Noncurrent	177,907	177,907	0
Operating Lease, Liability	$ 238,201	$ 238,201
Operating Lease, Weighted Average Discount Rate, Percent	4.60%	4.60%
Operating Leases, Future Minimum Payments, Due in Two Years			59,594
Operating Leases, Future Minimum Payments, Due in Three Years			47,264
Operating Leases, Future Minimum Payments, Due in Four Years			34,490
Operating Leases, Future Minimum Payments, Due in Five Years			24,493
Operating Leases, Future Minimum Payments, Due Thereafter			$ 40,302
Lessee, Operating Lease, Liability, Payments, Due Year Two	$ 64,614	$ 64,614
Lessee, Operating Lease, Liability, Payments, Due Year Three	53,127	53,127
Lessee, Operating Lease, Liability, Payments, Due Year Four	39,774	39,774
Lessee, Operating Lease, Liability, Payments, Due Year Five	30,201	30,201
Lessee, Operating Lease, Liability, Payments, Due after Year Five	47,550	47,550
Lessee, Operating Lease, Liability, Payments, Due	271,484	271,484
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	$ (33,283)	$ (33,283)