WESCO International (WCC) 10-K 14 Feb 25 2024 FY Annual report Financial data

COVER PAGE

COVER PAGE - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Feb. 13, 2025	Jun. 28, 2024
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Document Transition Report	false
Entity File Number	001-14989
Entity Registrant Name	WESCO International, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	25-1723342
Entity Address, Address Line One	225 West Station Square Drive
Entity Address, Address Line Two	Suite 700
Entity Address, Postal Zip Code	15219
Entity Address, State or Province	PA
Entity Address, City or Town	Pittsburgh,
City Area Code	412
Local Phone Number	454-2200
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Public Float			$ 7.7
Entity Common Stock, Shares Outstanding		48,795,929
Entity Central Index Key	0000929008
Documents Incorporated by Reference	Part III of this Form 10-K incorporates by reference portions of the registrant’s Proxy Statement for its 2025 Annual Meeting of Stockholders.
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Financial Statement Error Correction [Flag]	false
Common Class A [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	WCC
Name of Exchange	NYSE
Series A Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/1,000th interest in a share of Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock
Trading Symbol	WCC PR A
Name of Exchange	NYSE

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Auditor [Abstract]
Auditor Location	Pittsburgh, Pennsylvania
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 702.6	$ 524.1
Trade accounts receivable	3,454.4	3,639.5
Other accounts receivable	416.3	430.5
Inventories	3,501.7	3,572.1
Prepaid expenses and other current assets	276.4	225.4
Total current assets	8,351.4	8,391.6
Property, buildings and equipment, net	442.9	423.6
Operating Lease, Right-of-Use Asset	735.1	761.2
Intangible assets, net	1,835.9	1,857.6
Goodwill	3,280.1	3,262.3
Deferred Income Taxes	41.9	42.3
Other assets	374.1	322.3
Total assets	15,061.4	15,060.9
Current Liabilities:
Accounts payable	2,670.6	2,431.5
Accrued payroll and benefit costs	242.3	191.7
Short-term debt and current portion of long-term debt	19.5	8.6
Other current liabilities	871.6	756.6
Total current liabilities	3,804	3,388.4
Long-term Debt, Excluding Current Maturities	5,045.5	5,313.1
Operating Lease, Liability, Noncurrent	614.8	641.7
Deferred Income Tax Liabilities, Net	415.6	451.9
Other noncurrent liabilities	216	233.9
Total liabilities	10,095.9	10,029
Commitments and contingencies
Stockholders' Equity:
Additional capital	2,051.6	2,037.1
Retained earnings	4,960.7	4,391.7
Treasury stock, at cost	(1,495.1)	(1,060.4)
Accumulated other comprehensive income (loss)	(547.2)	(332)
Total stockholders' equity	4,970.7	5,037.1
Noncontrolling interest	(5.2)	(5.2)
Total WESCO International stockholders' equity	4,965.5	5,031.9
Total liabilities and stockholders' equity	15,061.4	15,060.9
Common Stock
Stockholders' Equity:
Common Stock	0.7	0.7
Common Class B
Stockholders' Equity:
Common Stock	0	0
Preferred Stock
Stockholders' Equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	0	0
Series A Preferred Stock
Stockholders' Equity:
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales	$ 21,818.8	$ 22,385.2	$ 21,420.1
Cost of goods sold (excluding depreciation and amortization below)	17,106.2	17,541.5	16,758.8
Selling, general and administrative expense	3,306.2	3,256	3,044.2
Depreciation and amortization	183.2	181.3	179
Income from operations	1,223.2	1,406.4	1,438.1
Interest expense, net	364.9	389.3	294.4
Other, net	(92.7)	25.1	7
Income before income taxes	951	992	1,136.7
Provision for income taxes	231.6	225.9	274.5
Net income	719.4	766.1	862.1
Net loss attributable to noncontrolling interest	1.8	0.6	1.7
Net Income attributable to WESCO International, Inc.	717.6	765.5	860.5
Preferred Stock Dividends, Income Statement Impact	57.4	57.4	57.4
Net Income (Loss) Available to Common Stockholders, Basic	660.2	708.1	803.1
Comprehensive Income:
Foreign currency translation adjustment	(228.7)	57.1	(127)
Benefit plan adjustments, net of tax	13.5	(11.3)	(14.7)
Comprehensive income attributable to WESCO International, Inc.	$ 445	$ 753.9	$ 661.3
Earnings per share :
Basic	$ 13.26	$ 13.86	$ 15.83
Diluted	$ 13.05	$ 13.54	$ 15.33
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (215.2)	$ 45.8	$ (141.7)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	504.2	811.9	720.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	$ 1.8	$ 0.6	$ 1.7

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Common Class B	Common Stock	Common Stock Common Class B	Preferred Stock	Additional Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest	Treasury Stock, Common [Member]
Common stock, shares issued			68,162,297	4,339,431
Preferred stock, shares issued					21,612
Treasury Stock, Common, Shares										22,026,922
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 3,776,200,000		$ 700,000	$ 0	$ 0	$ 1,969,300,000	$ 3,004,700,000	$ (236,000,000)	$ (6,300,000)	$ (956,200,000)
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)	1,900,000		$ 0							$ (1,900,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			569,112							1,229
APIC, Share-based Payment Arrangement, Recognition and Exercise						0
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	46,400,000					46,400,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(23,000,000)		$ 0			10,100,000	12,900,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			195,705
Net Income attributable to WESCO International, Inc.	860,500,000						860,500,000
Dividends, Preferred Stock	(57,400,000)						(57,400,000)
Stockholders' Equity, Other						(200,000)	100,000			$ 0
Translation adjustment	(127,100,000)							(127,000,000)
Benefit plan adjustments, tax	(3,400,000)
Benefit plan adjustments, net of tax	(14,700,000)							(14,700,000)
Net loss attributable to noncontrolling interest	1,700,000								1,700,000
Treasury Stock, Value, Acquired, Cost Method	(11,100,000)									$ (11,100,000)
Treasury Stock, Shares, Acquired										(87,502)
Common stock, shares issued			68,535,704	4,339,431
Preferred stock, shares issued					21,612
Treasury Stock, Common, Shares										22,115,653
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	4,449,600,000		$ 700,000	$ 0	$ 0	2,005,400,000	3,795,000,000	(377,800,000)	(4,700,000)	$ (969,200,000)
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)	15,800,000		$ 0							$ (16,200,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			1,054,608							100,998
APIC, Share-based Payment Arrangement, Recognition and Exercise						400,000
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	48,100,000					48,100,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(52,000,000)		$ 0			16,900,000	35,100,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			311,635
Net Income attributable to WESCO International, Inc.	765,500,000						765,500,000
Dividends, Preferred Stock	(57,400,000)						(57,400,000)
Stockholders' Equity, Other						100,000	300,000
Translation adjustment	57,500,000							57,100,000
Benefit plan adjustments, tax	(7,400,000)
Benefit plan adjustments, net of tax	(11,300,000)							(11,300,000)
Net loss attributable to noncontrolling interest	600,000								600,000
Treasury Stock, Value, Acquired, Cost Method	(75,000,000)									$ (75,000,000)
Treasury Stock, Shares, Acquired										(504,335)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(1,100,000)								(1,100,000)
Dividends, Common Stock	(76,600,000)						(76,600,000)
Common Stock		$ 0
Common stock, shares issued		4,339,431	69,278,677	4,339,431
Preferred stock, shares issued					21,612
Additional capital	2,037,100,000
Retained earnings	4,391,700,000
Treasury stock, at cost	(1,060,400,000)
Noncontrolling interest	(5,200,000)
Accumulated other comprehensive income (loss)	$ (332,000,000)
Treasury Stock, Common, Shares	22,720,986									22,720,986
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 5,031,900,000		$ 700,000	$ 0	$ 0	2,037,100,000	4,391,700,000	(332,000,000)	(5,200,000)	$ (1,060,400,000)
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense)	5,400,000		$ 0							$ (6,000,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			509,140							30,760
APIC, Share-based Payment Arrangement, Recognition and Exercise						600,000
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	28,900,000					28,900,000
Share Repurchase Program, Excise Tax										$ 3,800,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(24,900,000)		$ 0			15,100,000	9,800,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			160,419
Net Income attributable to WESCO International, Inc.	717,600,000						717,600,000
Dividends, Preferred Stock	(57,400,000)						(57,400,000)
Stockholders' Equity, Other						100,000	100,000			100,000
Translation adjustment	(228,400,000)							(228,700,000)
Benefit plan adjustments, tax	5,700,000
Benefit plan adjustments, net of tax	13,500,000							13,500,000
Net loss attributable to noncontrolling interest	1,800,000								1,800,000
Treasury Stock, Value, Acquired, Cost Method	(428,800,000)									$ (428,800,000)
Treasury Stock, Shares, Acquired										(2,424,488)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(1,800,000)								(1,800,000)
Dividends, Common Stock	(81,500,000)						(81,500,000)
Common Stock		$ 0
Common stock, shares issued		4,339,431	69,627,398	4,339,431
Preferred stock, shares issued					21,612
Additional capital	2,051,600,000
Retained earnings	4,960,700,000
Treasury stock, at cost	(1,495,100,000)
Noncontrolling interest	(5,200,000)
Accumulated other comprehensive income (loss)	$ (547,200,000)
Treasury Stock, Common, Shares	25,176,234									25,176,234
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 4,965,500,000		$ 700,000	$ 0	$ 0	$ 2,051,600,000	$ 4,960,700,000	$ (547,200,000)	$ (5,200,000)	$ (1,495,100,000)

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stockholders' Equity Parenthetical [Abstract]
Benefit plan adjustments, tax	$ 5,700,000	$ (7,400,000)	$ (3,400,000)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net income	$ 719.4	$ 766.1	$ 862.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	183.2	181.3	179
Stock-based compensation expense	28.9	48.1	46.4
Amortization of Debt Issuance Costs and Discounts	15.6	14.8	15.2
Gain (Loss) on Disposition of Business	(122.2)	0	0
Loss on abandonment of assets	17.8	0	0
Other operating activities, net	22.2	(0.5)	3.7
Deferred income taxes	(39.9)	(7.9)	(1.2)
Changes in assets and liabilities
Increase (Decrease) in Accounts Receivable	(50.7)	52.2	(690.6)
Increase (Decrease) in Accounts and Other Receivables	2	3.6	(54.8)
Inventories	(18)	(68.4)	(817)
Increase (Decrease) in Other Operating Assets	(142.6)	(60.6)	(153.2)
Accounts payable	(329.5)	319.7	(552.9)
Accrued payroll and benefit costs	62.7	(92.3)	(63.1)
Other current and noncurrent liabilities	93.3	(23.5)	131.6
Net cash provided by operating activities	1,101.2	493.2	11
Investing Activities:
Capital expenditures	(94.7)	(92.3)	(99.4)
Acquisition payments, net of cash acquired	(221.3)	0	(186.8)
Proceeds from Divestiture of Businesses, Net of Cash Divested	354.9	0	0
Other investing activities, net	1.5	2.7	2.6
Net cash used in investing activities	40.4	(89.6)	(283.6)
Financing Activities:
Proceeds from Short-Term Debt	4.3	17.1	19.5
Repayments of Short-Term Debt	(4.1)	(22.7)	(19.5)
Payments of Debt Issuance Costs	26.6	0	0
Proceeds from issuance of long-term debt	6,775	3,290.2	4,470
Repayments of Long-term Debt	(7,053.5)	(3,404.6)	(3,772.3)
Payment, Tax Withholding, Share-based Payment Arrangement	(30.9)	(68.3)	(25.8)
Payments for Repurchase of Common Stock	(425)	(75)	(11.1)
Payments of Ordinary Dividends, Common Stock	(81.5)	(76.6)	0
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(57.4)	(57.4)	(57.4)
Other financing activities, net	28.6	6.6	19.5
Net cash provided (used) by financing activities	(928.3)	(403.9)	584
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations	(34.8)	(2.9)	3.3
Net change in cash and cash equivalents	178.5	(3.2)	314.8
Cash and cash equivalents at the beginning of period	524.1	527.3	212.6
Cash and cash equivalents at the end of period	702.6	524.1	527.3
Supplemental disclosures:
Cash paid for interest	331.2	386.8	272.4
Cash paid for taxes	$ 253.3	$ 207.9	$ 292.9

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss	$ 55	$ 55.9
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 47.2	$ 43
Preferred stock, par value	$ 0.01
Preferred stock, shares authorized	20,000,000
Treasury Stock, Common, Shares	25,176,234	22,720,986
Preferred Stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares outstanding	0	0
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Series A Preferred Stock
Preferred stock, par value	$ 0.01
Preferred stock, shares authorized	25,000
Preferred stock, shares issued	21,612
Preferred stock, $.01 par value; 20,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	210,000,000	210,000,000
Common stock, shares issued	69,627,398	69,278,677
Common stock, shares outstanding	48,790,595	50,897,122
Common Class B
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	4,339,431	4,339,431
Common stock, shares outstanding	0	0

ORGANIZATION

ORGANIZATION	12 Months Ended
	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION	WESCO International, Inc. (“Wesco International”) and its subsidiaries (collectively, “Wesco” or the “Company”), headquartered in Pittsburgh, Pennsylvania, is a leading provider of business-to-business distribution, logistics services and supply chain solutions.

Accounting Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Basis of Presentation The consolidated financial statements include the accounts of Wesco International and all of its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. In 2023 we changed our presentation in tables from thousands to millions. Certain amounts as of December 31, 2024 and 2023 and for the years ended December 31, 2024, 2023 and 2022 in the consolidated financial statements and associated notes may not foot or recalculate due to rounding. Reclassifications The Consolidated Statements of Cash Flows and the reconciliation between the federal statutory income tax rate and the effective tax rate in Note 11, “Income Taxes” for the years ended December 31, 2023 and 2022 include certain reclassifications to previously reported amounts to conform to the current period’s presentation. The table of deferred tax assets and liabilities in Note 11, “Income Taxes” for the year ended December 31, 2023 also includes certain reclassifications to previously reported amounts to conform to the current period’s presentation. Such reclassifications had no impact on the totals of operating, investing and financing cash flow activities, the effective tax rates, or totals of the deferred tax assets and liabilities for those years. Use of Estimates The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Although these estimates are based on management’s best knowledge of current events and actions Wesco may undertake in the future, actual results may ultimately differ from the estimates. Revenue Recognition Wesco’s revenue arrangements generally consist of single performance obligations to transfer a promised good or service, or a combination of goods and services. Revenue is measured as the amount of consideration Wesco expects to receive in exchange for transferring goods or providing services. Revenue is recognized when control has transferred to the customer, which is generally when the product has shipped from a Wesco facility or directly from a supplier. However, transfer may occur at a later date depending on the agreed upon terms, such as delivery at the customer’s designated location, or based on consignment terms. For products that ship directly from suppliers to customers, Wesco generally acts as the principal in the transaction and recognizes revenue on a gross basis. When providing services, sales are generally recognized over time as control transfers to the customer, which occurs as services are rendered. Wesco generally satisfies its performance obligations within a year or less. Wesco generally does not have significant financing terms associated with its contractual arrangements; payments are normally received within 60 days. There are generally no significant costs associated with obtaining customer contracts. Wesco typically passes through warranties offered by manufacturers or suppliers to its customers. Sales taxes (and value added taxes in foreign jurisdictions) collected from customers and remitted to governmental authorities are excluded from net sales. Supplier Volume Rebates Wesco receives volume rebates from certain suppliers based on contractual arrangements with such suppliers. Volume rebates are included within other accounts receivable in the Consolidated Balance Sheets, and represent the estimated amounts due to Wesco based on forecasted purchases and the rebate provisions of the various supplier contracts. The Company’s volume rebate arrangements with suppliers are generally for the period of January 1 through December 31. The corresponding rebate income is recorded as a reduction to cost of goods sold. Receivables under the supplier rebate program were $210.0 million at December 31, 2024 and $233.1 million at December 31, 2023. Supplier volume rebate income as a percentage of net sales was 1.3% in 2024, 1.4% in 2023 and 1.6% in 2022. Supplier Finance Programs The Company has supplier finance programs that are administered by intermediaries. Under these arrangements, participating suppliers may elect to receive early payment of invoices that have been confirmed by the Company, less an interest deduction or fees paid by the supplier, which is paid to the supplier by third-party finance providers. Wesco agrees to pay the stated amount of confirmed invoices in full on the original due date of the invoices, which is typically within 45 to 180 days of the invoice date, regardless of whether the supplier elects to receive early payment from the third-party finance providers. The Company does not provide assets pledged as security or other forms of guarantees to the finance providers or intermediaries under these arrangements. During the fourth quarter of 2024, the Company finalized the termination of one of its supplier finance programs and settled all obligations under the program. As of December 31, 2024 and 2023, the amounts due to suppliers that participate in the Company’s supplier finance programs were approximately $ 12.4 million 32.6 million The following table sets forth the rollforward of outstanding obligations confirmed as valid under the Company’s supplier finance programs for the year ended December 31, 2024: (In millions) 2024 Confirmed obligations outstanding at the beginning of the year $ 32.6 Invoices confirmed during the year 106.0 Confirmed invoices paid during the year (126.2) Confirmed obligations outstanding at the end of the year $ 12.4 Cash and Cash Equivalents Cash equivalents are defined as highly liquid investments with original maturities of 90 days or less when purchased. Cash and cash equivalents in the Consolidated Balance Sheets include $19.7 million and $21.9 million as of December 31, 2024 and 2023, respectively, that is restricted from use to fund operations. Allowance for Expected Credit Losses Wesco recognizes expected credit losses resulting from the inability of its customers to make required payments through an allowance account that is measured each reporting period. Wesco estimates credit losses over the life of its trade accounts receivable using a combination of historical loss data, current credit conditions, specific customer circumstances, and reasonable and supportable forecasts of future economic conditions. The allowance for expected credit losses was $55.0 million and $55.9 million at December 31, 2024 and 2023, respectively. The total amount recorded as selling, general and administrative expense related to credit losses was $18.7 million, $18.6 million and $18.0 million for 2024, 2023 and 2022, respectively. Inventories Inventories primarily consist of merchandise purchased for resale and are stated at the lower of cost or net realizable value. Cost is determined principally under the average cost method. Wesco reduces the carrying value of its inventories at the earlier of identifying an item that is considered to be obsolete or in excess of supply relative to demand, or no movement in a prescribed number of months. The carrying value of inventories reflect reductions for excess and obsolescence of $131.3 million and $113.4 million at December 31, 2024 and 2023, respectively. The total expense related to excess and obsolete inventories, which is included in cost of goods sold, was $66.0 million, $63.1 million and $43.2 million for 2024, 2023 and 2022, respectively. Property, Buildings and Equipment Property, buildings and equipment are recorded at cost. Depreciation expense is determined using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over either their respective lease terms or their estimated lives, whichever is shorter. Estimated useful lives typically range from five to forty years for buildings and leasehold improvements and three to eight years for furniture, fixtures and equipment. Costs incurred during the application development stage of internally developed software are capitalized and are reported at the lower of unamortized cost or net realizable value. Costs incurred during the preliminary project and post-implementation stages are expensed as incurred. Capitalized costs include external direct costs of materials and services consumed in developing internal-use computer software, payroll and payroll-related costs for employees who are directly associated with and who devote time to the internal-use computer software project, as well as interest costs. Internal-use computer software is amortized using the straight-line method over its estimated useful life, typically three to seven years. Expenditures for new facilities and improvements that extend the useful life of an asset are capitalized. Ordinary repairs and maintenance are expensed as incurred. When property or other long-lived assets are retired, abandoned, or otherwise disposed, the cost and the related accumulated depreciation are removed from the accounts and any resulting gains or losses are recorded and reported as selling, general and administrative expenses. Of Wesco’s $442.9 million net book value of property, buildings and equipment as of December 31, 2024, $183.1 million consists of land, buildings and leasehold improvements that are geographically dispersed among Wesco’s more than 700 sites, including distribution centers, fulfillment centers, and sales offices, mitigating the risk of impairment. Wesco assesses its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of any such assets may not be fully recoverable. Changes in circumstances include, among others, technological advances, changes in the business model, capital structure, economic conditions or operating performance. The evaluation is based upon, among other things, utilization, serviceability and assumptions developed by management, which are categorized as Level 3 of the fair value hierarchy, related to the estimated future undiscounted cash flows that these assets are expected to generate. When the sum of the undiscounted cash flows is less than the carrying value of the asset (asset group), an impairment loss is recognized to the extent that carrying value exceeds fair value. Management applies its best judgment when performing these evaluations. Leases 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 has elected the short-term lease measurement and recognition exemption; therefore, leases with an initial term of twelve months or less are not recorded on the balance sheet. Operating lease expense is recognized on a straight-line basis over the lease term. Operating lease assets and liabilities are recognized at the commencement date based on the present value of the future minimum lease payments. Certain leases contain rent escalation clauses that are either fixed or adjusted periodically for inflation or market rates and such clauses are factored into the Company’s determination of lease payments. Wesco also has variable lease payments that do not depend on a rate or index, primarily for items such as common area maintenance and real estate taxes, which are recorded as variable expense when incurred. The operating lease asset includes advance payments and excludes incentives and initial direct costs incurred. 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 non-lease 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, or terminate early. 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. For most of Wesco’s leases, the discount rate implicit in the lease is not readily determinable. Accordingly, the Company uses its incremental borrowing rate on a secured basis based on the information available at the lease commencement date to discount lease payments to the present value. Goodwill and Indefinite-Lived Intangible Assets Goodwill and indefinite-lived intangible assets are tested for impairment annually as of October 1, or more frequently if triggering events occur, indicating that their carrying value may not be recoverable. Wesco tests for goodwill impairment on a reporting unit level. We have the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit or indefinite-lived intangible asset is less than its carrying value as a basis for determining whether it is necessary to perform quantitative impairment tests. If performing a qualitative assessment, the Company assesses factors, including macroeconomic conditions, industry and market considerations, cost factors, overall financial performance, other relevant events such as changes in key personnel, changes in the composition or carrying amount of the net assets of a reporting unit, and changes in share price, among others, to determine whether it is more likely than not that the fair value of Wesco’s reporting units are less than their carrying values. If the qualitative assessment indicates that the fair values of the Company’s reporting units or indefinite-lived intangible assets may not exceed their respective carrying values, or if the Company elects to bypass the optional qualitative assessments, then Wesco performs quantitative tests for impairment by comparing the fair value of each reporting unit or indefinite-lived intangible asset to its carrying value. The Company determines the fair values of its reporting units using a discounted cash flow analysis and consideration of market multiples. The discounted cash flow analysis uses certain assumptions, including projected revenues and expected operating margins supported by a combination of historical results, current forecasts, market data and recent economic events, which are categorized within Level 3 of the fair value hierarchy. The Company uses a discount rate that reflects market participants’ cost of capital. The Company evaluates the recoverability of indefinite-lived intangible assets using the relief-from-royalty method based on projected financial information. The relief-from-royalty method uses certain assumptions including projected revenues, discount rates, royalty rates, and applicable income tax rates. At December 31, 2024 and 2023, goodwill and indefinite-lived intangible assets totaled $4.1 billion. The determination of fair value involves significant management judgment, particularly as it relates to the underlying assumptions and factors around projected revenues, future expected operating margins and discount rate. Management applies its best judgment when assessing the reasonableness of financial projections. Fair values are sensitive to changes in underlying assumptions and factors. As a result, there can be no assurance that the estimates and assumptions made for purposes of the annual goodwill and indefinite-lived intangible assets impairment tests will prove to be an accurate prediction of future results. Definite-Lived Intangible Assets Definite-lived intangible assets are amortized over five twenty Cloud Computing Arrangements The Company capitalizes costs associated with implementing its various cloud computing arrangements, which are amortized using the straight-line method over the estimated useful life, typically three to seven years. Capitalized implementation costs, which are recorded as a component of other assets in the Consolidated Balance Sheets, were $257.8 million and $195.4 million as of December 31, 2024 and 2023, respectively, and the related accumulated amortization was $29.6 million and $15.5 million, respectively. Amortization expense related to cloud computing arrangements totaled $14.1 million, $9.2 million and $4.0 million for the years ended December 31, 2024, 2023 and 2022, respectively. During the second quarter of 2024, management determined that a third-party developed operations management software product would be abandoned in favor of an application that better suits the Company’s operations and the Company recognized a $17.8 million loss on abandonment of assets, which is recorded as a component of selling, general and administrative expenses in the Consolidated Statement of Income and Comprehensive Income for the year ended December 31, 2024. Insurance Programs Wesco uses commercial insurance for auto, workers’ compensation, casualty and health claims, and information technology as a risk-reduction strategy to minimize catastrophic losses. The Company’s strategy involves large deductible policies where Wesco must pay all costs up to the deductible amount. Wesco estimates the reserve for these programs based on historical incident rates and costs. The assumptions included in developing this accrual include the period of time between the incurrence and payment of a claim. The total liability related to insurance programs was $33.4 million and $28.1 million at December 31, 2024 and 2023, respectively. Income Taxes Wesco accounts for income taxes under the asset and liability method, which requires the recognition of deferred income taxes for events that have future tax consequences. Under this method, deferred income taxes are recognized (using enacted tax laws and rates) based on the future income tax effects of differences in the carrying amounts of assets and liabilities for financial reporting and tax purposes. The effect of a tax rate change on deferred tax assets and liabilities is recognized in income in the period of change. Wesco recognizes deferred tax assets consistent with amounts expected to be realized. To make such determination, management evaluates all positive and negative evidence, including but not limited to, prior, current and future taxable income, tax planning strategies and future reversals of existing taxable temporary differences. A valuation allowance is recognized if it is “more-likely-than-not” that some or all of a deferred tax asset will not be realized. Wesco regularly assesses the realizability of deferred tax assets. Wesco accounts for uncertainty in income taxes using a “more-likely-than-not” recognition threshold. Due to the subjectivity inherent in the evaluation of uncertain tax positions, the tax benefit ultimately recognized may materially differ from the estimate recognized in the consolidated financial statements. Wesco recognizes interest and penalties related to uncertain tax benefits as part of interest expense and income tax expense, respectively. The Tax Cuts and Jobs Act of 2017 (the “TCJA”) imposed a one-time tax on the deemed repatriation of undistributed foreign earnings (the “transition tax”). Except for a portion of foreign earnings previously taxed in the U.S. that can effectively be distributed without further material U.S. or foreign taxation, the Company continues to assert that the undistributed earnings of its foreign subsidiaries are indefinitely reinvested. To the extent the earnings of the Company’s foreign subsidiaries are distributed in the form of dividends, such earnings may be subject to additional taxes. The Company believes that it is able to maintain a sufficient level of liquidity for its domestic operations and commitments without incurring any material tax cost to repatriate cash held by its foreign subsidiaries. The provisions of the TCJA also introduced U.S. taxation on certain global intangible low-taxed income (“GILTI”). Wesco has elected to account for GILTI tax as a component of income tax expense. Foreign Currency The functional currency for most of the Company’s operations outside the U.S. is generally the applicable local currency. Assets and liabilities of these operations are translated to U.S. dollars at the exchange rate in effect at the end of each period. Income statement accounts are translated at an exchange rate that approximates the average for the period. Translation adjustments arising from the use of differing exchange rates from period to period are included as a component of accumulated other comprehensive income (loss) within stockholders’ equity. Gains and losses from foreign currency transactions are included in net income for the period. The Company may re-evaluate the functional currencies of certain operations outside the U.S. if there are significant changes to operations that indicate that a change in functional currency may be necessary. Defined Benefit Pension Plans Liabilities and expenses for defined benefit pension plans are determined using actuarial methodologies and incorporate significant assumptions, including the interest rate used to discount the future estimated cash flows, the expected long-term rate of return on plan assets, and several assumptions relating to the employee workforce (salary increases, retirement age, and mortality). Unrealized gains and losses related to the Company’s defined benefit pension obligations are recognized as a component of accumulated other comprehensive income (loss) within stockholders’ equity. Gains or losses resulting from plan amendments, curtailments, and settlements are recognized as a component of other non-operating income and expenses (“other expense (income), net”) in the period of the remeasurement. Fair Value of Financial Instruments The Company measures the fair value of assets and liabilities on a recurring and nonrecurring basis according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of the fair value hierarchy are as follows: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible at the measurement date; Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, and Level 3 inputs are unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to measurements involving significant unobservable inputs (Level 3). The Company measures the fair values of goodwill, intangible assets and property, buildings and equipment on a nonrecurring basis if required by impairment tests applicable to these assets, as described above. Other (Income) Expense, net Other non-operating income and expenses (“other (income) expense, net”) primarily includes the non-service cost components of net periodic pension cost (benefit), foreign exchange gains and losses, and periodic, non-operating transactions. For the year ended December 31, 2024, these periodic, non-operating transactions included the divestiture of the Wesco Integrated Supply (“WIS”) business, which resulted in a gain from the sale of $122.2 million, described further in Note 5, “Acquisitions and Divestitures”. Recently Adopted and Recently Issued Accounting Standards In September 2022, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2022-04, Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations , which requires that a buyer in a supplier finance program disclose sufficient information about the program to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude. The amendments in this ASU are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. The Company adopted this ASU in the first quarter of 2023, except for the amendment on rollforward information, which the Company adopted in the fourth quarter of 2024. The adoption of this ASU resulted in additional disclosure of the Company’s supplier finance programs. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which enhances prior reportable segment disclosure requirements in part by requiring entities to disclose significant expenses related to their reportable segments. The amendments in this ASU are effective on a retrospective basis for annual periods beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The Company adopted this ASU in the fourth quarter of 2024. The adoption of this ASU resulted in additional required disclosures, including the disclosure of certain expenses at the reportable segment level, described further in Note 16, “Business Segments”. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as information on income taxes paid to enhance the transparency and decision usefulness of income tax disclosures. The amendments in this ASU are effective for annual periods beginning after December 15, 2024 on a prospective basis. Management is currently evaluating the impact that this accounting standard will have on its consolidated financial statements and notes thereto. In March 2024, the SEC issued final climate-related disclosure rules requiring disclosure of material climate-related risks, board and management governance of such risks, and material direct and indirect greenhouse gas emissions. The rules also require disclosure in the notes to the financial statements of the effects of severe weather events and other natural conditions. Disclosures will be made prospectively, with phased-in effective dates starting with fiscal years beginning on or after January 1, 2025. In April 2024, the SEC voluntarily stayed implementation of the climate-related disclosure rules, pending completion of judicial review of consolidated challenges to the rules by the Court of Appeals for the Eighth Circuit. Management is currently evaluating the impact that these rules could have on its consolidated financial statements and notes thereto. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses , which is intended to enhance expense disclosures, primarily by requiring disclosure of disaggregated information about certain income statement expense line items on an annual and interim basis. The amendments in this ASU are effective for fiscal years beginning after December 15, 2026 and interim periods within fiscal years beginning after December 15, 2027. The amendments in this ASU should be applied prospectively; however, retrospective application is permitted. Management is currently evaluating the impact that this accounting standard will have 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.
Reclassifications	Reclassifications The Consolidated Statements of Cash Flows and the reconciliation between the federal statutory income tax rate and the effective tax rate in Note 11, “Income Taxes” for the years ended December 31, 2023 and 2022 include certain reclassifications to previously reported amounts to conform to the current period’s presentation. The table of deferred tax assets and liabilities in Note 11, “Income Taxes” for the year ended December 31, 2023 also includes certain reclassifications to previously reported amounts to conform to the current period’s presentation. Such reclassifications had no impact on the totals of operating, investing and financing cash flow activities, the effective tax rates, or totals of the deferred tax assets and liabilities for those years.
Supplier Finance Program	Supplier Finance Programs The Company has supplier finance programs that are administered by intermediaries. Under these arrangements, participating suppliers may elect to receive early payment of invoices that have been confirmed by the Company, less an interest deduction or fees paid by the supplier, which is paid to the supplier by third-party finance providers. Wesco agrees to pay the stated amount of confirmed invoices in full on the original due date of the invoices, which is typically within 45 to 180 days of the invoice date, regardless of whether the supplier elects to receive early payment from the third-party finance providers. The Company does not provide assets pledged as security or other forms of guarantees to the finance providers or intermediaries under these arrangements. During the fourth quarter of 2024, the Company finalized the termination of one of its supplier finance programs and settled all obligations under the program. As of December 31, 2024 and 2023, the amounts due to suppliers that participate in the Company’s supplier finance programs were approximately $ 12.4 million 32.6 million The following table sets forth the rollforward of outstanding obligations confirmed as valid under the Company’s supplier finance programs for the year ended December 31, 2024: (In millions) 2024 Confirmed obligations outstanding at the beginning of the year $ 32.6 Invoices confirmed during the year 106.0 Confirmed invoices paid during the year (126.2) Confirmed obligations outstanding at the end of the year $ 12.4

REVENUE

REVENUE	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	Wesco distributes products and provides services to customers globally in various end markets within its business segments. The segments, which consist of EES, CSS and UBS operate in the United States, Canada and various other countries. The following tables disaggregate Wesco’s net sales by segment and geography for the periods presented: Year Ended December 31, (In millions) 2024 2023 2022 Electrical & Electronic Solutions $ 8,546.8 $ 8,610.3 $ 8,823.3 Communications & Security Solutions 7,537.0 7,152.2 6,401.5 Utility & Broadband Solutions 5,735.0 6,622.7 6,195.3 Total by segment $ 21,818.8 $ 22,385.2 $ 21,420.1 Year Ended December 31, (In millions) 2024 2023 2022 United States $ 16,189.8 $ 16,609.1 $ 15,857.3 Canada 2,940.1 2,968.2 3,021.4 Other International (1) 2,688.9 2,807.9 2,541.4 Total by geography (2) $ 21,818.8 $ 22,385.2 $ 21,420.1 (1) No individual country’s net sales are greater than 10% of total net sales. (2) Wesco attributes revenues from external customers to individual countries on the basis of point of sale. Due to the terms of certain contractual arrangements, Wesco bills or receives payment from its customers in advance of satisfying the respective performance obligation. Such advance billings or payments are recorded as deferred revenue and recognized as revenue when the performance obligation has been satisfied and control has transferred to the customer, which is generally upon shipment. Deferred revenue is usually recognized within a year or less from the date of the advance billing or payment receipt. At December 31, 2024 and 2023, $141.8 million and $111.9 million, respectively, of deferred revenue was recorded as a component of other current liabilities in the Consolidated Balance Sheets. The Company recognized $76.9 million and $74.0 million of revenue during the years ended December 31, 2024 and 2023, respectively, that was included in the deferred revenue balance as of December 31, 2023 and 2022, respectively. The amount of revenue recognized during 2022 that was deferred as of December 31, 2021 was not material. Wesco’s revenues are adjusted for variable consideration, which includes customer volume rebates, returns and discounts. Wesco measures variable consideration by estimating expected outcomes using analysis and inputs based upon historical data, as well as current and forecasted information. Variable consideration is reviewed by management on a monthly basis and revenue is adjusted as necessary. Variable consideration reduced revenue for the years ended December 31, 2024, 2023 and 2022 by approximately $436.2 million, $427.8 million and $417.1 million, respectively. As of December 31, 2024 and 2023, the Company’s estimated product return obligation was $41.0 million and $41.3 million, respectively. Billings to customers for shipping and handling are recognized in net sales. 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 $303.3 million, $306.8 million and $302.3 million for the years ended December 31, 2024, 2023 and 2022, respectively.

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	The Company’s financial instruments primarily consist of cash and cash equivalents, accounts receivable, accounts payable, bank overdrafts, outstanding indebtedness, foreign currency forward contracts, and benefit plan assets. The fair value of the Company’s benefit plan assets is disclosed in Note 13, “Employee Benefit Plans” and except for outstanding indebtedness and foreign currency forward contracts, the carrying value of the Company’s remaining financial instruments approximates fair value. The Company uses a market approach to determine the fair value of its debt instruments, utilizing quoted prices in active markets, interest rates and other relevant information generated by market transactions involving similar instruments. Therefore, the inputs used to measure the fair value of the Company’s debt instruments are classified as Level 2 within the fair value hierarchy. The carrying value of Wesco’s debt instruments with fixed interest rates was $3,074.9 million and $2,823.7 million as of December 31, 2024 and 2023, respectively. The estimated fair value of this debt was $3,127.3 million and $2,880.3 million as of December 31, 2024 and 2023, respectively. The reported carrying values of Wesco’s other debt instruments, including those with variable interest rates, approximated their fair values as of December 31, 2024 and 2023. The Company purchases foreign currency forward contracts to reduce the effect of fluctuations in foreign currency-denominated accounts on its earnings. The foreign currency forward contracts are not designated as hedges for accounting purposes. The Company’s strategy is to negotiate terms for its derivatives and other financial instruments to be highly effective, such that the change in the value of the derivative offsets the impact of the underlying hedge. Its counterparties to foreign currency forward contracts have investment-grade credit ratings. The Company regularly monitors the creditworthiness of its counterparties to ensure no issues exist that could affect the value of its derivatives.
Derivatives and Fair Value	The Company purchases foreign currency forward contracts to reduce the effect of fluctuations in foreign currency-denominated accounts on its earnings. The foreign currency forward contracts are not designated as hedges for accounting purposes. The Company’s strategy is to negotiate terms for its derivatives and other financial instruments to be highly effective, such that the change in the value of the derivative offsets the impact of the underlying hedge. Its counterparties to foreign currency forward contracts have investment-grade credit ratings. The Company regularly monitors the creditworthiness of its counterparties to ensure no issues exist that could affect the value of its derivatives.

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLE ASSETS	6. GOODWILL AND INTANGIBLE ASSETS The following table sets forth the changes in the carrying value of goodwill by reportable segment for the periods presented: EES CSS UBS Total (In millions) Balance as of December 31, 2022 $ 825.5 $ 1,208.9 $ 1,206.5 $ 3,240.9 Adjustments to goodwill for acquisitions — 0.9 — 0.9 Foreign currency exchange rate changes 12.6 1.8 6.1 20.5 Balance as of December 31, 2023 $ 838.1 $ 1,211.6 $ 1,212.6 $ 3,262.3 Adjustments to goodwill for acquisitions 4.7 147.2 — 151.9 Adjustment to goodwill for divestiture — — (58.1) (58.1) Foreign currency exchange rate changes (43.5) (11.8) (20.7) (76.0) Balance as of December 31, 2024 $ 799.3 $ 1,347.0 $ 1,133.8 $ 3,280.1 The components of intangible assets are as follows: December 31, 2024 December 31, 2023 Life (in years) Gross Carrying Amount (1) Accumulated Amortization (1) Net Gross Carrying Amount (1) Accumulated Amortization (1) Net (In millions) Intangible assets: Trademarks Indefinite $ 789.7 $ — $ 789.7 $ 793.0 $ — $ 793.0 Customer relationships 10 - 20 1,502.4 (476.4) 1,026.0 1,519.9 (464.4) 1,055.5 Distribution agreements 15 and 19 29.2 (27.7) 1.5 29.2 (26.0) 3.2 Trademarks 5 and 12 15.5 (11.7) 3.8 15.5 (9.6) 5.9 Software 7 16.0 (1.1) 14.9 — — — $ 2,352.8 $ (516.9) $ 1,835.9 $ 2,357.6 $ (500.0) $ 1,857.6 (1) Excludes the original cost and related accumulated amortization of fully-amortized intangible assets. Amortization expense related to intangible assets totaled $86.1 million, $88.6 million and $92.9 million for the years ended December 31, 2024, 2023 and 2022, respectively. The following table sets forth the remaining estimated amortization expense for intangible assets for the next five years and thereafter: For the year ending December 31, (In millions) 2025 $ 88.7 2026 83.5 2027 80.6 2028 79.0 2029 77.9 Thereafter 636.5 Total $ 1,046.2 The Company performed its annual impairment tests of goodwill and indefinite-lived intangible assets during the fourth quarter of 2024 by comparing the fair values of its reporting units and indefinite-lived intangible assets to their carrying values in an elective quantitative test. As a result of these assessments, the Company determined that the fair values of its reporting units and indefinite-lived intangible assets continue to exceed their respective carrying amounts.

ACQUISITIONS

ACQUISITIONS	12 Months Ended
	Dec. 31, 2024
Business Combinations [Abstract]
ACQUISITIONS	Ascent, LLC On December 5, 2024, through its wholly-owned subsidiary Anixter Inc., the Company acquired 100% of the equity securities of Ascent, LLC (“Ascent”). Headquartered in St. Louis, Missouri, Ascent is a provider of data center facility management services with over 300 employees in the U.S. and Canada. Ascent’s expertise in engineering and design-build consultation services, in addition to daily site operations, extends the Company’s suite of capabilities and solutions that serve the entire lifecycle of the data center. The Company funded the purchase price paid at closing with cash on hand as well as borrowings under its revolving credit facility. The total preliminary estimated fair value of consideration transferred for the acquisition of Ascent consisted of the following: (In millions) Purchase price $ 185.0 Adjustments to purchase price (3.3) Total cash consideration 181.7 Seller expenses paid by Wesco 5.1 Total purchase consideration $ 186.8 Supplemental cash flow disclosure related to acquisitions: Cash paid for acquisition $ 186.8 Less: Cash acquired (7.2) Cash paid for acquisition, net of cash acquired $ 179.6 The preliminary purchase consideration was allocated to the identified assets acquired and liabilities assumed based on their respective acquisition date fair value, with the excess allocated to goodwill. The Company identified a customer relationship intangible asset and estimated its fair value using an income valuation method. The excess purchase consideration recorded as goodwill is not deductible for income tax purposes, and has been assigned to the Company’s CSS reportable segment. The resulting goodwill is primarily attributable to Ascent’s workforce and expertise in engineering and design-build consultation services. The estimated fair values of assets acquired and liabilities assumed are based on preliminary calculations and valuations using estimates and assumptions at the time of acquisition. As the Company obtains additional information during the measurement period (not to exceed one year from the acquisition date), estimates and assumptions for the preliminary purchase consideration allocations may change materially. The following table sets forth the preliminary allocation of the purchase consideration to the respective fair values of assets acquired and liabilities assumed for the acquisition of Ascent: Assets (In millions) Cash and cash equivalents $ 7.2 Trade accounts receivable 51.8 Intangible asset (1) 58.0 Goodwill 118.2 Other current and noncurrent assets 26.5 Total assets $ 261.7 Liabilities Accounts payable $ 20.9 Accrued payroll and benefit costs 7.8 Other current and noncurrent liabilities 46.2 Total liabilities $ 74.9 Fair value of net assets acquired, including goodwill and intangible asset $ 186.8 (1) Consists of a customer relationship intangible asset with an estimated useful life of 15 years. Independent Electric Supply Inc. Effective July 1, 2024, the Company acquired 100% of the equity securities of Independent Electric Supply Inc. (“IES”), a full-line electrical distributor headquartered in Ontario, Canada. The total fair value of consideration for the acquisition of IES of $13.2 million includes total cash consideration of $11.6 million, net of cash acquired, paid at closing with cash on hand, and contingent consideration not to exceed $2.9 million. The assets acquired included a customer relationship intangible asset with an estimated fair value of $5.9 million. entroCIM On June 3, 2024, the Company acquired the assets and liabilities held by Warez, LLC and Hepta Systems, LLC, which own and operate the entroCIM business (collectively, “entroCIM”). entroCIM is an innovator in data center and building intelligence software. The total fair value of consideration for the acquisition of entroCIM of $36.5 million includes total cash consideration of $30.1 million, paid at closing with cash on hand, and contingent consideration not to exceed $8.0 million, with an estimated fair value of $6.4 million, recorded in current and noncurrent liabilities in the Consolidated Balance Sheet as of December 31, 2024. The preliminary purchase consideration was allocated to the identified assets acquired and liabilities assumed based on their respective acquisition date fair value, which primarily comprised a developed software intangible asset with an estimated fair value of $8.0 million based on an income valuation method, with the excess of $29.0 million allocated to goodwill in the Company’s CSS reportable segment. Wesco Integrated Supply (“WIS”) Divestiture On April 1, 2024, Wesco Distribution, Inc. (“Wesco Distribution”) completed the sale of its WIS business for a base purchase price of $350.0 million. Adjusted for net working capital, closing cash, and closing indebtedness purchase price adjustments, the divestiture was completed for total consideration of $354.9 million. The WIS business, located primarily in the U.S. and Canada, was part of the UBS reportable segment and provided products and services to large industrial and commercial end-users to support their maintenance, repair, and operating spend. The Company recognized a gain from the sale of $122.2 million, which is recorded as a component of other (income) expense, net in the Consolidated Statement of Income and Comprehensive Income for the year ended December 31, 2024. Upon closing, Wesco Distribution entered into certain Transition Services Agreements (“TSAs”) under which Wesco Distribution agreed to provide transition services to the purchaser for approximately nine months. Revenues associated with these TSAs are not material. The sale of the WIS business did not represent a strategic shift that had a major effect on the Company’s operations and financial results, and therefore does not meet the criteria to be classified as discontinued operations. Rahi Systems Holdings, Inc. On November 1, 2022, the Company acquired 100% of the equity securities of Rahi Systems Holdings, Inc. (“Rahi Systems” or “Rahi”). The total fair value of consideration for the acquisition of Rahi of $255.4 million included cash paid of $186.8 million, net of $68.6 million of cash acquired.

PROPERTY, BUILDINGS AND EQUIPME

PROPERTY, BUILDINGS AND EQUIPMENT	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
PROPERTY, BUILDINGS AND EQUIPMENT	7. PROPERTY, BUILDINGS AND EQUIPMENT The following table sets forth the components of property, buildings and equipment: As of December 31, 2024 2023 (In millions) Buildings and leasehold improvements $ 246.9 $ 202.6 Furniture, fixtures and equipment 404.4 359.9 Software costs 316.5 292.6 967.8 855.1 Accumulated depreciation and amortization (554.1) (502.5) 413.7 352.6 Land 25.3 25.0 Construction in progress 3.9 46.0 Property, buildings and equipment, net $ 442.9 $ 423.6 Depreciation expense was $66.8 million, $56.3 million and $47.8 million, and capitalized software amortization was $30.3 million, $36.4 million and $38.3 million, in 2024, 2023 and 2022, respectively. As of December 31, 2024 and 2023, unamortized software costs were $88.9 million and $78.2 million, respectively. Furniture, fixtures and equipment include finance leases of $85.4 million and $51.9 million and related accumulated depreciation of $27.6 million and $19.9 million as of December 31, 2024 and 2023, respectively.

LEASES

LEASES	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Lessee, Operating Leases	8. LEASES Wesco leases substantially all of its real estate, as well as automobiles, trucks, information technology hardware, and other equipment under lease arrangements classified as operating. The Company’s finance leases, which are recorded in the Consolidated Balance Sheets as a component of property, buildings and equipment, current portion of long-term debt and long-term debt, 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 periods presented: As of December 31, (In millions) 2024 2023 Operating lease assets $ 735.1 $ 761.2 Current operating lease liabilities (1) 169.5 156.7 Noncurrent operating lease liabilities 614.8 641.7 Total operating lease liabilities $ 784.3 $ 798.4 (1) Current operating lease liabilities are recorded as a component of other current liabilities in the Consolidated Balance Sheets. 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: Year Ended December 31, (In millions) 2024 2023 2022 Operating lease cost $ 223.6 $ 197.0 $ 175.8 Short-term lease cost 6.9 8.9 4.8 Variable lease cost 60.3 53.2 45.7 Total lease cost $ 290.8 $ 259.1 $ 226.4 Variable lease cost consists of the non-lease components described in Note 2, “Accounting Policies”, 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 periods presented: Year Ended December 31, (In millions) 2024 2023 2022 Operating cash flows from operating leases $ 212.7 $ 174.5 $ 171.7 Right-of-use assets obtained in exchange for new operating lease liabilities 205.5 296.9 267.1 As of December 31, 2024 and 2023, the weighted-average remaining lease term for operating leases was approximately 6 years. The weighted-average discount rate used to measure operating leases was 4.7% and 4.3% as of December 31, 2024 and 2023, respectively. The following table sets forth the maturities of the Company’s operating lease liabilities and reconciles the respective undiscounted payments to the total operating lease liabilities in the Consolidated Balance Sheet as of December 31, 2024: (In millions) 2025 $ 205.2 2026 178.5 2027 149.9 2028 116.0 2029 83.9 Thereafter 161.7 Total undiscounted operating lease payments 895.2 Less: imputed interest (110.9) Total operating lease liabilities $ 784.3 Operating lease payments include $10.3 million related to options to extend real estate lease terms that are reasonably certain of being exercised. As of December 31, 2024, the Company has additional leases related to facilities that have not yet commenced totaling $117.6 million. These operating leases, which are not recorded in the Consolidated Balance Sheet as of December 31, 2024, will commence in 2025 with lease terms of 1 to 10 years.

DEBT

DEBT	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	The following table sets forth Wesco’s outstanding indebtedness: As of December 31, 2024 2023 (In millions) International lines of credit $ 0.6 $ 1.0 Accounts Receivable Securitization Facility 1,450.0 1,550.0 Revolving Credit Facility 525.0 953.0 6.00% Anixter Senior Notes due 2025 4.2 4.2 7.125% Senior Notes due 2025 — 1,500.0 7.250% Senior Notes due 2028, less debt discount of $4.4 and $5.6 in 2024 and 2023, respectively 1,320.6 1,319.4 6.375% Senior Notes due 2029 900.0 — 6.625% Senior Notes due 2032 850.0 — Finance lease obligations 57.3 31.4 Total debt 5,107.7 5,359.0 Plus: Fair value adjustments to the Anixter Senior Notes 0.1 0.1 Less: Unamortized debt issuance costs (42.8) (37.4) Less: Short-term debt and current portion of long-term debt (19.5) (8.6) Total long-term debt $ 5,045.5 $ 5,313.1 International Lines of Credit Certain foreign subsidiaries of Wesco have entered into uncommitted lines of credit, some of which are overdraft facilities, to support local operations. The maximum borrowing limit varies by facility and ranges between $0.6 million and $9.5 million. The international lines of credit generally are renewable on an annual basis and certain facilities are fully and unconditionally guaranteed by Wesco Distribution. Accordingly, certain borrowings under these lines directly reduce availability under the Company’s revolving credit facility. The applicable interest rate for borrowings under these lines of credit varies by country and is governed by the applicable loan agreement. The average interest rate for these facilities was 1.75% and 0.85% at December 31, 2024 and 2023, respectively. Accounts Receivable Securitization Facility Wesco Distribution has an accounts receivable securitization facility (the “Receivables Facility”) pursuant to the terms and conditions of a Fifth Amended and Restated Receivables Purchase Agreement (the “Receivables Purchase Agreement”), by and among WESCO Receivables Corp. (“Wesco Receivables”), Wesco Distribution, the various purchaser groups from time to time party thereto and PNC Bank, National Association, as Administrator, dated as of June 22, 2020. The Receivables Purchase Agreement amended and restated the receivables purchase agreement entered into on September 24, 2015 (the “Prior Receivables Purchase Agreement”). Borrowings under the Receivables Facility funded by certain lenders through such lenders’ issuance of commercial paper bear interest at the applicable commercial paper rate. Otherwise, borrowings bear interest at the option of the borrower, either at the 30-day Secured Overnight Financing Rate-based (“SOFR”) rate or the daily resetting SOFR rate, plus applicable spreads. As of December 31, 2024, the Receivables Facility has a purchase limit of $1,550 million, with the opportunity to exercise an accordion feature that permits increases in the purchase limit up to an aggregate commitment of $1,850 million, subject to customary conditions, and a maturity date of March 1, 2027. The Receivables Facility has a weighted average interest rate spread of 1.05% and a commitment fee of 0.45%. As of December 31, 2024 and 2023, accounts receivable eligible for securitization totaled $1,976.3 million and $2,146.9 million, respectively. The Consolidated Balance Sheets as of December 31, 2024 and 2023 include $1,450.0 million and $1,550.0 million, respectively, of senior undivided interests in accounts receivable balances sold to third parties, as well as borrowings for equal amounts. At December 31, 2024, the interest rate for this facility was approximately 5.39%. Under the Receivables Facility, Wesco Distribution sells, on a continuous basis, an undivided interest in all domestic accounts receivable to Wesco Receivables, a wholly-owned special purpose entity (the “SPE”). The SPE sells, without recourse, a senior undivided interest in the receivables to financial institutions for cash while maintaining a subordinated undivided interest in the receivables, in the form of overcollateralization. Since Wesco maintains control of the transferred receivables, the transfers do not qualify for “sale” treatment. As a result, the transferred receivables remain on the Company’s balance sheet, and Wesco recognizes the related secured borrowing. Wesco has agreed to continue servicing the receivables for the third-party conduits and financial institutions at market rates; accordingly, no servicing asset or liability has been recorded. On March 8, 2024, Wesco Distribution amended its Receivables Facility pursuant to the terms and conditions of an Eighth Amendment to Fifth Amended and Restated Receivables Purchase Agreement (the “Eighth Receivables Amendment”), by and among WESCO Receivables Corp., Wesco Distribution, the various purchasers and purchaser agents party thereto and PNC Bank, National Association, as administrator. The Eighth Receivables Amendment modified the Receivables Purchase Agreement originally entered into on June 22, 2020. The Eighth Receivables Amendment, among other things, (i) reduced the purchase limit under the Receivables Facility from $1,625 million to $1,550 million, (ii) increased the capacity to request increases in the purchase limit under the Receivables Facility from $125 million to $300 million, (iii) extended the termination date of the Receivables Facility to March 1, 2027, (iv) added a commercial paper funding option for any conduit purchaser funding its investment through issuances of notes, and (v) modified the drawn spread applicable to investments. No other material terms were changed. Revolving Credit Facility Wesco, Wesco Distribution and certain other subsidiaries of Wesco entered into a revolving credit facility (the “Revolving Credit Facility”) as a replacement of Wesco Distribution’s revolving credit facility entered into on September 26, 2019, pursuant to the terms and conditions of a Fourth Amended and Restated Credit Agreement, dated as of June 22, 2020 (the “Revolving Credit Agreement”), among Wesco Distribution, the other U.S. borrowers party thereto (collectively, the “U.S. Borrowers”), WESCO Distribution Canada LP (“Wesco Canada”), the other Canadian borrowers party thereto (collectively, the “Canadian Borrowers”), Wesco, the lenders party thereto and Barclays Bank PLC, as the administrative agent. As of December 31, 2024, the Revolving Credit Facility has revolving commitments of $1,725 million, a letter of credit sub-facility of up to $175 million, an accordion feature allowing Wesco Distribution to request increases to the borrowing commitments under the Revolving Credit Facility of up to $450 million in the aggregate, subject to customary conditions, and a sub-facility for loans denominated in Canadian dollars of $625 million. The Revolving Credit Facility has a maturity date of March 1, 2027 and permits the Company to declare and pay an aggregate amount of common stock dividends of up to $115 million per year or higher under certain conditions. The applicable interest rate for borrowings under the Revolving Credit Facility, as amended, includes interest rate spreads based on available borrowing capacity that range from 1.00% to 1.50% for SOFR-based borrowings and from 0.00% to 0.50% for prime rate-based borrowings. At December 31, 2024, the interest rate for this facility was approximately 5.75%. During 2024, Wesco borrowed $3,411.0 million under the Revolving Credit Facility and made repayments in the aggregate amount of $3,839.0 million. During 2023, aggregate borrowings and repayments under the Revolving Credit Facility were $2,997.2 million and $3,067.5 million, respectively. Wesco had $1,170.4 million available under the Revolving Credit Facility at December 31, 2024, after giving effect to outstanding letters of credit and certain borrowings under the Company’s international lines of credit, as compared to $736.0 million available under the Revolving Credit Facility at December 31, 2023, after giving effect to outstanding letters of credit and certain borrowings under the Company’s international lines of credit. On March 6, 2024, Wesco Distribution amended its Revolving Credit Facility pursuant to the terms and conditions of a Sixth Amendment to Fourth Amended and Restated Credit Agreement (the “Sixth Revolver Amendment”). The Sixth Revolver Amendment amended the Revolving Credit Agreement to, among other things, modify the Canadian interest rate options and increase certain negative covenant baskets. No other material terms were changed. The obligations of Wesco Distribution and the other U.S. Borrowers under the Revolving Credit Facility have been guaranteed by Wesco and certain of Wesco Distribution’s subsidiaries (including certain subsidiaries of Anixter). The obligations of Wesco Canada and the other Canadian Borrowers under the Revolving Credit Facility (including certain subsidiaries of Anixter) have been guaranteed by certain subsidiaries of Wesco Canada and the other Canadian Borrowers. The Revolving Credit Facility is secured by (i) substantially all assets of Wesco Distribution, the other U.S. Borrowers and certain of Wesco Distribution’s subsidiaries (including certain subsidiaries of Anixter), other than, among other things, real property and accounts receivable sold or intended to be sold pursuant to the Receivables Facility, and (ii) substantially all assets of Wesco Canada, the other Canadian Borrowers and certain of Wesco Canada’s subsidiaries, other than, among other things, real property, in each case, subject to customary exceptions and limitations. The Revolving Credit Agreement requires compliance with conditions that must be satisfied prior to any borrowing as well as ongoing compliance with certain customary affirmative and negative covenants. The Revolving Credit Agreement contains customary events of default. Upon the occurrence and during the continuance of an event of default, the commitments of the lenders may be terminated, and all outstanding obligations of the loan parties under the Revolving Credit Facility may be declared immediately due and payable. 5.50% Senior Notes due 2023 6.00% Senior Notes due 2025 On April 30, 2020, in connection with the merger with Anixter, Wesco Distribution commenced offers to purchase for cash (each, a “Wesco Tender Offer” and, together the “Wesco Tender Offers”) any and all of Anixter Inc.’s outstanding (i) $350.0 million aggregate principal amount of 5.50% Senior Notes due 2023 (the “Anixter 2023 Senior Notes”) and (ii) $250.0 million aggregate principal amount of 6.00% Senior Notes due 2025 (the “Anixter 2025 Senior Notes” and, together with the Anixter 2023 Senior Notes, the “Anixter Senior Notes”). The Anixter 2023 Senior Notes matured on March 1, 2023, on which date Wesco Distribution repaid the $58.6 million aggregate principal amount of its Anixter 2023 Senior Notes plus accrued interest up to, but not including, the maturity date. The repayment was funded with borrowings under the Company’s Revolving Credit Facility and had no impact on the Company’s results of operations. The Anixter 2025 Senior Notes will mature on December 1, 2025. 7.125% Senior Notes due 2025 7.250% Senior Notes due 2028 On June 12, 2020, Wesco Distribution issued $1,500 million aggregate principal amount of 7.125% Senior Notes due 2025 (the “2025 Notes”) and $1,325 million aggregate principal amount of 7.250% Senior Notes due 2028 (the “2028 Notes” and, together with the 2025 Notes, the “2025 and 2028 Notes”). The 2025 Notes were issued at a price of 100% of the aggregate principal amount. The 2028 Notes were issued at a price of 99.244% of the aggregate principal amount. Wesco incurred costs related to the issuance of the 2025 Notes and 2028 Notes totaling $33.1 million and $29.3 million, respectively, which were recorded as a reduction to the carrying value of the debt and are being amortized over the respective lives of the notes. The 2025 and 2028 Notes were issued pursuant to, and are governed by, an indenture (the “2025 and 2028 Notes Indenture”), dated as of June 12, 2020, between the Company, Wesco Distribution and U.S. Bank National Association, as trustee (the “Trustee”). The 2025 and 2028 Notes and related guarantees were issued in a private transaction exempt from the Securities Act of 1933, as amended (the “Securities Act”) and have not been, and will not be, registered under the Securities Act and may not be offered or sold in the U.S. absent registration or an applicable exemption from, or in a transaction not subject to the registration requirements of the Securities Act and other applicable securities laws. The Company used the net proceeds from the issuance of the 2025 and 2028 Notes, together with borrowings under its Revolving Credit Facility and Receivables Facility and existing cash on hand, to finance the merger with Anixter and the other transactions contemplated by the Agreement and Plan of Merger dated January 10, 2020 (the “Merger Agreement”). The use of proceeds included (i) paying the cash portion of the consideration to stockholders of Anixter, (ii) refinancing certain existing indebtedness of Anixter contemplated by the Merger Agreement, including financing the satisfaction and discharge, defeasance, redemption or other repayment in full of the 5.125% Senior Notes due 2021 of Anixter Inc., a wholly-owned subsidiary of Anixter, and financing payments in connection with the Anixter Consent Solicitations and Wesco Tender Offers, as described above, (iii) refinancing other indebtedness of the Company, and (iv) paying fees, costs and expenses in connection with the foregoing. The 2025 Notes were unsecured and unsubordinated obligations of Wesco Distribution and were guaranteed on an unsecured, unsubordinated basis by the Company and Anixter Inc. The 2025 Notes had a stated interest rate of 7.125% per annum, payable semi-annually in arrears on June 15 and December 15 of each year. The 2025 Notes had a maturity date of June 15, 2025 and were redeemable in whole or in part at a redemption price equal to 101.781% of the principal amount between June 15, 2023 and June 14, 2024 or 100% of the principal amount on and after June 15, 2024. The 2028 Notes are unsecured and unsubordinated obligations of Wesco Distribution and are guaranteed on an unsecured, unsubordinated basis by the Company and Anixter Inc. The 2028 Notes accrue interest at a rate of 7.250% per annum, payable semi-annually in arrears on June 15 and December 15 of each year. The 2028 Notes will mature on June 15, 2028. Between June 15, 2024 and June 14, 2025, Wesco Distribution may redeem all or a part of the 2028 Notes at a redemption price equal to 102.417% of the principal amount. Between June 15, 2025 and June 14, 2026, Wesco Distribution may redeem all or a part of the 2028 Notes at a redemption price equal to 101.208% of the principal amount. On and after June 15, 2026, Wesco Distribution may redeem all or a part of the 2028 Notes at a redemption price equal to 100% of the principal amount. On May 20, 2024, Wesco Distribution exercised its right to redeem the entire outstanding $1,500 million aggregate principal amount of the 2025 Notes, and U.S. Bank Trust Company, National Association, as successor to U.S. Bank National Association, as trustee under the 2025 Notes Indenture, issued a notice of redemption to registered holders of the 2025 Notes. On June 17, 2024, Wesco Distribution redeemed the $1,500 million aggregate principal amount of the 2025 Notes at a redemption price equal to 100% of the principal amount plus accrued interest up to, but not including, June 15, 2024. The redemption of the 2025 Notes was funded through the issuance of the 6.375% Senior Notes due 2029 (the “2029 Notes”) and the 6.625% Senior Notes due 2032 (the “2032 Notes” and, together with the 2029 Notes, the “2029 and 2032 Notes”) as described below. The Company recognized a non-cash loss of $6.8 million from the redemption of the 2025 Notes resulting from the write-off of unamortized debt issuance costs, which is recorded as a component of interest expense, net in the Consolidated Statement of Income and Comprehensive Income for the year ended December 31, 2024. 6.375% Senior Notes due 2029 6.625% Senior Notes due 2032 On March 7, 2024, Wesco Distribution issued $900 million aggregate principal amount of 6.375% senior notes due 2029 and $850 million aggregate principal amount of 6.625% senior notes due 2032. The 2029 and 2032 Notes were issued at a price of 100% of the aggregate principal amount. Wesco incurred costs related to the issuance of the 2029 Notes and 2032 Notes totaling $11.3 million and $10.6 million, respectively, which were recorded as a reduction to the carrying value of the debt and are being amortized over the respective lives of the notes. The 2029 and 2032 Notes were issued pursuant to, and are governed by, an indenture (the “2029 and 2032 Notes Indenture”), dated as of March 7, 2024, among Wesco Distribution, the Company, Anixter Inc., and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). The 2029 and 2032 Notes and related guarantees were issued in a private transaction exempt from the Securities Act. The Company used the net proceeds from the issuance of the 2029 and 2032 Notes to redeem the 2025 Notes on June 17, 2024 and for other corporate purposes. The 2029 and 2032 Notes are unsecured and unsubordinated obligations of Wesco Distribution and are guaranteed on an unsecured, unsubordinated basis by the Company and Anixter Inc. The 2029 Notes accrue interest at a rate of 6.375% per annum, payable semi-annually in arrears on March 15 and September 15 of each year. The 2029 Notes will mature on March 15, 2029. The 2032 Notes accrue interest at a rate of 6.625% per annum, payable semi-annually in arrears on March 15 and September 15 of each year. The 2032 Notes will mature on March 15, 2032. Wesco Distribution may redeem all or a part of the 2029 Notes at any time prior to March 15, 2026 by paying a “make-whole” premium plus accrued and unpaid interest, if any, to but excluding the redemption date. In addition, at any time prior to March 15, 2026, Wesco Distribution may redeem up to 35% of the original aggregate principal amount of the 2029 Notes with the net cash proceeds from certain equity offerings. At any time between March 15, 2026 and March 14, 2027, Wesco Distribution may redeem all or a part of the 2029 Notes at a redemption price equal to 103.188% of the principal amount. Between March 15, 2027 and March 14, 2028, Wesco Distribution may redeem all or a part of the 2029 Notes at a redemption price equal to 101.594% of the principal amount. On and after March 15, 2028, Wesco Distribution may redeem all or a part of the 2029 Notes at a redemption price equal to 100% of the principal amount. Wesco Distribution may redeem all or a part of the 2032 Notes at any time prior to March 15, 2027 by paying a “make-whole” premium plus accrued and unpaid interest, if any, to but excluding the redemption date. In addition, at any time prior to March 15, 2027, Wesco Distribution may redeem up to 35% of the original aggregate principal amount of the 2032 Notes with the net cash proceeds from certain equity offerings. At any time between March 15, 2027 and March 14, 2028, Wesco Distribution may redeem all or a part of the 2032 Notes at a redemption price equal to 103.313% of the principal amount. Between March 15, 2028 and March 14, 2029, Wesco Distribution may redeem all or a part of the 2032 Notes at a redemption price equal to 101.657% of the principal amount. On and after March 15, 2029, Wesco Distribution may redeem all or a part of the 2032 Notes at a redemption price equal to 100% of the principal amount. Debt Issuance Costs Wesco capitalizes certain costs associated with the issuance of debt and such costs are amortized over the term of the respective debt instrument on a straight-line basis. Debt issuance costs are presented in the Consolidated Balance Sheets as a direct reduction to the carrying amount of the related debt liability. Upon prepayment of debt, the Company accelerates the recognition of an appropriate amount of the costs as refinancing or extinguishment of debt. As of December 31, 2024 and 2023, unamortized debt issuance costs of $42.8 million and $37.4 million were recorded in the Consolidated Balance Sheets, respectively. Covenant Compliance Wesco’s credit agreements contain various restrictive covenants that, among other things, impose limitations on: (i) dividend payments or certain other restricted payments or investments; (ii) the incurrence of additional indebtedness and guarantees; (iii) creation of liens; (iv) mergers, consolidation or sales of substantially all of Wesco’s assets; (v) certain transactions among affiliates; (vi) payments by certain subsidiaries to Wesco, and (vii) capital expenditures. In addition, the Revolving Credit Facility and the Receivables Facility require Wesco to meet certain fixed charge coverage tests depending on availability or liquidity, respectively. The 2025 and 2028 Notes Indenture and the 2029 and 2032 Notes Indenture (the “Indentures”) contain certain covenants that, among other things, limit the Company’s and its restricted subsidiaries’ ability to incur liens on assets, make certain restricted payments, engage in certain sale and leaseback transactions or sell certain assets or merge or consolidate with or into other companies, subject to certain qualifications and exceptions, including the termination of certain of these covenants upon the 2028 Notes or the 2029 and 2032 Notes receiving investment grade credit ratings. The Indentures contain certain events of default, including, among other things, failure to make required payments, failure to comply with certain agreements or covenants, failure to pay or acceleration of certain other indebtedness, certain events of bankruptcy and insolvency, and failure to pay certain judgments. An event of default under the Indentures will allow either the Trustee or the holders of at least 25% in aggregate principal amount of the applicable series of the then-outstanding Notes to accelerate or, in certain cases, will automatically cause the acceleration of the amounts due under the applicable series of Notes. Wesco was in compliance with all financial covenants contained in its debt agreements as of December 31, 2024. The following table sets forth the aggregate principal repayment requirements for all indebtedness for the next five years and thereafter, as of December 31, 2024: (In millions) 2025 $ 19.5 2026 14.2 2027 1,987.2 2028 1,333.5 2029 904.6 Thereafter 853.1 Total payments on debt 5,112.1 Debt discount (4.4) Total debt $ 5,107.7

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	12 Months Ended
	Dec. 31, 2024
Stockholders' Equity Note [Abstract]
CAPITAL STOCK	Preferred Stock There are 20 million shares of preferred stock authorized at a par value of $0.01 per share; there are no shares issued or outstanding. The Company’s Board of Directors has the authority, without further action by the stockholders, to issue all authorized preferred shares in one or more series and to fix the number of shares, designations, voting powers, preferences, optional and other special rights and the restrictions or qualifications thereof. The rights, preferences, privileges and powers of each series of preferred stock may differ with respect to dividend rates, liquidation values, voting rights, conversion rights, redemption provisions and other matters. Series A Preferred Stock The Company’s Board of Directors authorized 25,000 shares of fixed-rate reset cumulative perpetual preferred stock, Series A, with a liquidation preference of $25,000 per whole preferred share and a par value of $0.01 per share (the “Series A Preferred Stock”). Depositary shares, each representing a 1/1,000th interest in a share of Series A Preferred Stock, are registered under the Securities Act. The Company has issued 21,611,534 depositary shares, representing an interest in approximately 21,612 shares of Series A Preferred Stock. Holders of shares of the Series A Preferred Stock are entitled to receive, when, as and if declared by the Company’s Board of Directors, cumulative cash dividends at an initial rate of 10.625% per annum of the $25,000 liquidation preference per share. On June 22, 2025, and every five-year period thereafter, the dividend rate on the Series A Preferred Stock resets and will be equal to the Five-year U.S. Treasury Rate plus a spread of 10.325%. Holders of the Series A Preferred Stock are not entitled to convert or exchange their shares of Series A Preferred stock into shares of any of Wesco’s other classes or series of stock or into any other security of Wesco (other than upon a change of control involving the issuance of additional shares of common stock or other change of control transaction, in each case, approved by holders of common stock). The Series A Preferred Stock has no stated maturity and will not be subject to any sinking fund, retirement fund or purchase fund or any other obligation of Wesco to redeem, repurchase or retire the Series A Preferred Stock. On June 22, 2025, Wesco may redeem the Series A Preferred Stock, in whole or in part, for cash at a redemption price of $25,000 per share, plus all accrued and unpaid dividends. Holders of the Series A Preferred Stock will have limited voting rights, including the right to elect two directors to the Board of Directors of the Company in the event dividends on the Series A Preferred Stock remain unpaid for the equivalent of six or more full quarterly dividend periods. Common Stock There are 210 million shares of common stock and 20 million shares of Class B common stock authorized at a par value of $0.01 per share. The Class B common stock is identical to the common stock, except for voting and conversion rights. The holders of Class B common stock have no voting rights. With certain exceptions, Class B common stock may be converted, at the option of the holder, into the same number of shares of common stock. Certain of the Company’s credit agreements place limits on the Company’s ability to declare or pay dividends and repurchase common stock. These restrictions are based on availability, as defined in the respective credit agreements, as well as Wesco’s compliance with certain fixed charge coverage tests. At December 31, 2024 and 2023, no dividends had been declared that remained unpaid and, therefore, no retained earnings were reserved for dividend payments. Treasury Stock Common stock purchased for treasury is recorded at cost. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock, with cost determined on a weighted-average basis. Share Repurchases On May 31, 2022, the Company’s Board of Directors adopted a resolution authorizing the repurchase of up to $1 billion of the Company’s common stock and Series A Preferred Stock. The share repurchase authorization has no expiration date and may be modified, suspended, or terminated at any time without prior notice. During the year ended December 31, 2024, the Company entered into spot repurchase transactions through brokers to purchase 2,424,488 shares of its common stock in the open market for cash totaling $428.8 million, including excise taxes. Wesco funded the repurchases with available cash and borrowings under its accounts receivable securitization and revolving credit facilities. During the year ended December 31, 2023, the Company entered into spot repurchase transactions through a broker to purchase 504,335 shares of its common stock totaling $75.0 million. Wesco funded the repurchases with available cash and borrowings under its revolving credit facility. During the year ended December 31, 2022, the Company entered into entered into spot repurchase transactions through a broker to purchase 87,502 shares of its common stock in the open market for cash totaling $11.1 million. Wesco funded the repurchases with available cash and borrowings under its revolving credit facility. These repurchases were made within the limits described above. Dividends The Company’s dividends on common stock are declared at the discretion of the Board of Directors. During the years ended December 31, 2024 and 2023, the Board of Directors declared and the Company paid quarterly cash dividends totaling $81.5 million and $76.6 million, respectively, to common stockholders. The following table is a summary of cash dividends declared and paid on the Company’s common stock for the year ended December 31, 2024: Date Declared Record Date Payment Date Amount per share Dividend Payment February 29, 2024 March 15, 2024 March 29, 2024 $ 0.413 $ 20.9 million May 30, 2024 June 14, 2024 June 28, 2024 $ 0.413 $ 20.3 million August 29, 2024 September 13, 2024 September 30, 2024 $ 0.413 $ 20.2 million December 2, 2024 December 13, 2024 December 31, 2024 $ 0.413 $ 20.1 million The following table is a summary of cash dividends declared and paid on the Company’s common stock for the year ended December 31, 2023: Date Declared Record Date Payment Date Amount per share Dividend Payment March 3, 2023 March 15, 2023 March 31, 2023 $ 0.375 $ 19.2 million June 1, 2023 June 15, 2023 June 30, 2023 $ 0.375 $ 19.2 million August 31, 2023 September 15, 2023 September 29, 2023 $ 0.375 $ 19.1 million November 30, 2023 December 15, 2023 December 29, 2023 $ 0.375 $ 19.1 million During the years ended December 31, 2024, 2023 and 2022, the Company’s Board of Directors also declared and the Company paid quarterly cash dividends of $0.664 per depositary share relating to its Series A Preferred Stock totaling $57.4 million each year.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	11. INCOME TAXES The following table sets forth the components of income before income taxes by jurisdiction: Year Ended December 31, 2024 2023 2022 (In millions) United States $ 713.7 $ 739.4 $ 859.4 Foreign 237.3 252.6 277.3 Income before income taxes $ 951.0 $ 992.0 $ 1,136.7 The following table sets forth the components of the provision for income taxes: Year Ended December 31, 2024 2023 2022 (In millions) Current income taxes: Federal $ 150.2 $ 124.8 $ 166.1 State 41.5 34.6 43.0 Foreign 79.8 74.4 66.7 Total current income taxes 271.5 233.8 275.8 Deferred income taxes: Federal (22.8) (1.0) (7.5) State (5.0) 2.7 0.7 Foreign (12.1) (9.6) 5.6 Total deferred income taxes (39.9) (7.9) (1.2) Provision for income taxes $ 231.6 $ 225.9 $ 274.5 The following table sets forth the reconciliation between the federal statutory income tax rate and the effective tax rate: Year Ended December 31, 2024 2023 2022 Federal statutory rate 21.0 % 21.0 % 21.0 % State income taxes, net of federal income tax benefit 2.9 3.0 3.1 Tax effect of intercompany financing (1.0) (0.9) (1.2) Change in valuation allowance 1.0 (0.9) (0.9) Tax effect of foreign income 1.0 1.1 1.6 Other (0.5) (0.5) 0.6 Effective tax rate 24.4 % 22.8 % 24.2 % The corporate alternative minimum tax (“CAMT”) was enacted as part of the Inflation Reduction Act of 2022. The CAMT imposes a minimum tax of 15% on the adjusted financial statement income (“AFSI”) of certain corporations with average annual AFSI over a three-year period in excess of $1 billion, so-called “applicable corporations”. CAMT is effective for tax years beginning after December 31, 2022. The Company was not subject to CAMT for the years ended December 31, 2024 and 2023, respectively, and does not expect to be subject to it for the year ended December 31, 2025. The undistributed earnings of the Company’s foreign subsidiaries amounted to approximately $2,107.7 million as of December 31, 2024. Most of these earnings have been taxed in the U.S. under either the one-time transition tax or the GILTI tax regime imposed by the TCJA. Wesco has elected to pay the transition tax in installments over an eight year period ending in 2026. As of December 31, 2024, the Company’s remaining liability for the transition tax was $37.7 million, which is recorded as components of other current and noncurrent liabilities in the Consolidated Balance Sheet. The Company continues to assert that the remaining undistributed earnings of its foreign subsidiaries are indefinitely reinvested. The distribution of earnings by Wesco’s foreign subsidiaries in the form of dividends, or otherwise, may be subject to additional taxation. The Company estimates that additional taxes of approximately $69.4 million would be payable upon the remittance of all previously undistributed foreign earnings as of December 31, 2024, based upon the laws in effect on that date. The Company believes that it is able to maintain sufficient liquidity for its domestic operations and commitments without repatriating cash from Wesco’s foreign subsidiaries. The following table sets forth deferred tax assets and liabilities: As of December 31, 2024 2023 (In millions) Assets Liabilities Assets Liabilities Accounts receivable $ 22.4 $ — $ 23.3 $ — Inventories 50.7 — 45.9 — Depreciation of property, buildings and equipment — 20.9 — 41.0 Operating leases 210.1 200.3 201.8 192.0 Amortization of intangible assets — 545.9 — 564.5 Employee benefits 27.8 — 21.5 — Stock-based compensation 8.8 — 11.2 — Disallowed business interest expense 4.8 — 2.2 — Net operating loss carryforwards 35.6 — 36.7 — Foreign tax credit carryforwards 41.0 — 41.1 — Other 33.2 8.4 38.0 10.3 Deferred income taxes before valuation allowance 434.4 775.5 421.7 807.8 Valuation allowance (32.6) — (23.5) — Total deferred income taxes $ 401.8 $ 775.5 $ 398.2 $ 807.8 Wesco had deferred tax assets of $31.7 million and $31.4 million as of December 31, 2024 and 2023, respectively, related to foreign net operating loss carryforwards. These net operating loss carryforwards expire beginning in 2026 through 2043, while some may be carried forward indefinitely. The Company has determined that certain foreign net operating loss carryforwards will not be realized before they expire. Accordingly, the Company has recorded a valuation allowance of $19.5 million and $12.9 million against deferred tax assets related to certain foreign net operating loss carryforwards as of December 31, 2024 and 2023, respectively. Additionally, these foreign jurisdictions had deferred tax assets of $6.6 million and $6.1 million as of December 31, 2024 and 2023, respectively, related to other future deductible temporary differences. The Company has recorded a full valuation allowance against these amounts as of December 31, 2024 and 2023, respectively. As of December 31, 2024 and 2023, Wesco had deferred tax assets of $3.9 million and $3.0 million, respectively, related to state net operating loss carryforwards. These net operating loss carryforwards expire beginning in 2025 through 2043, while some may be carried forward indefinitely. The Company has determined that certain state net operating loss carryforwards will not be realized. Accordingly, the Company has recorded a valuation allowance of $0.9 million and $1.0 million against deferred tax assets related to certain state net operating loss carryforwards as of December 31, 2024 and 2023, respectively. As of December 31, 2024 and 2023, Wesco had deferred tax assets of $4.8 million and $2.2 million, respectively, in certain foreign and state jurisdictions related to disallowed business interest expense. The carryforward period for disallowed business interest expense is indefinite. The Company has determined that disallowed business interest expense carryforwards for certain jurisdictions will not be realized. Accordingly, the Company has recorded a valuation allowance of $0.8 million and $0.5 million against deferred tax assets related to disallowed business interest expense carryforwards in these jurisdictions as of December 31, 2024 and 2023, respectively. As of December 31, 2024 and 2023, Wesco had deferred tax assets of $41.0 million and $41.1 million, respectively, related to foreign tax credit carryforwards. The foreign tax credit carryforwards expire beginning in 2027 through 2034. The Company has determined that certain foreign tax credit carryforwards will not be realized before they expire. Accordingly, the Company has recorded a valuation allowance of $4.8 million and $2.9 million against these deferred tax assets as of December 31, 2024 and 2023, respectively. Wesco’s ability to realize its deferred tax assets related to foreign tax credit carryforwards may be impacted by U.S. tax legislation, our ability to generate sufficient foreign source taxable income, and tax planning strategies that the Company may implement. The impact of these items, if any, on Wesco’s assessment of the realizability of these deferred tax assets will be recorded as a discrete item in the period in which the Company’s assessment changes. The Company is under examination by tax authorities in various jurisdictions and remains subject to examination until the applicable statutes of limitation expire. The statutes of limitation for the material jurisdictions in which the Company files income tax returns remain open as follows: United States — Federal 2021 and forward United States — Material States 2017 and forward Canada 2012 and forward UK 2019 and forward Australia 2018 and forward The following table sets forth the reconciliation of gross unrecognized tax benefits: As of December 31, 2024 2023 2022 (In millions) Beginning balance January 1 $ 121.3 $ 109.3 $ 107.3 Additions for current year tax positions 20.5 29.2 14.4 Additions for prior year tax positions 9.1 6.6 0.9 Additions for acquired tax positions — 0.9 5.5 Reductions for prior year tax positions (2.2) (6.7) (1.8) Settlements — (2.5) — Lapse in statute of limitations (13.0) (15.8) (14.5) Foreign currency exchange rate changes (4.5) 0.3 (2.6) Ending balance December 31 $ 131.2 $ 121.3 $ 109.3 The amount of unrecognized tax benefits that would affect the effective tax rate if recognized in the consolidated financial statements for the years ended December 31, 2024, 2023 and 2022 were $36.8 million, $40.1 million, and $40.6 million, respectively. Within the next twelve months, the amount of unrecognized tax benefits is expected to decrease by $8.7 million due to the expiration of statutes of limitation. Such change would result in a $4.0 million reduction in income tax expense. The Company classifies interest related to unrecognized tax benefits as a component of interest expense, net in the Consolidated Statements of Income and Comprehensive Income. The Company recognized net interest income on unrecognized tax benefits of $1.6 million and $1.1 million for the years ended December 31, 2024 and 2023, respectively. The Company recognized net interest expense on unrecognized tax benefits of $2.3 million for the year ended December 31, 2022. As of December 31, 2024 and 2023, Wesco had a liability of $7.7 million and $8.9 million, respectively, for interest expense related to unrecognized tax benefits. The Company classifies penalties related to unrecognized tax benefits as part of income tax expense. Penalties recorded in income tax expense for the years ended December 31, 2024 , 2023 and 2022 were immaterial. As of December 31, 2024 and 2023, Wesco had a liability of $3.7 million and $4.7 million, respectively, for penalties related to unrecognized tax benefits. In October 2021, one of the Company’s Mexican affiliates received a tax assessment from the Mexican tax authorities in the amount of approximately $26.0 million related to its 2012 income tax return. This amount, updated for adjustments required under Mexican law, was approximately $28.5 million as of December 31, 2024. The Company believes the assessment is without merit and has filed an annulment lawsuit in the Mexican Federal Court of Administrative Justice. The Company expects to prevail in this litigation and, accordingly, has not recognized a liability for this assessment in its consolidated financial statements. In July 2022, one of the Company’s Canadian affiliates received tax assessments from the Canada Revenue Agency (“CRA”) totaling approximately $11.0 million, including tax and interest, related to its 2012 through 2014 income tax returns. The Company’s Canadian affiliate also received a related penalty assessment of approximately $2.7 million in May 2023. The assessments totaled approximately $18.0 million in the aggregate, including additional interest updated through December 31, 2024. The Company believes these assessments are without merit and has appealed to the Tax Court of Canada. The Company expects to prevail in the courts and, therefore, has not recognized a liability for these assessments in its consolidated financial statements. The CRA continues to audit the 2015 through 2019 tax years of Wesco’s Canadian affiliates and the Company expects to eventually receive similar assessments for these tax years.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
EARNINGS PER SHARE	Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the periods. Diluted earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of equity awards. The following table sets forth the details of basic and diluted earnings per share: Year Ended December 31, 2024 2023 2022 (In millions, except per share data) Net income attributable to WESCO International, Inc. $ 717.6 $ 765.5 $ 860.5 Less: Preferred stock dividends 57.4 57.4 57.4 Net income attributable to common stockholders $ 660.2 $ 708.1 $ 803.1 Weighted-average common shares outstanding used in computing basic earnings per share 49.8 51.1 50.7 Common shares issuable upon exercise of dilutive equity awards 0.8 1.2 1.7 Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share 50.6 52.3 52.4 Earnings per share attributable to common stockholders Basic $ 13.26 $ 13.86 $ 15.83 Diluted $ 13.05 $ 13.54 $ 15.33 The computation of diluted earnings per share attributable to common stockholders excludes stock-based awards that would have had an antidilutive effect on earnings per share. For the years ended December 31, 2024, 2023, and 2022, there were approximately 0.2 million, 0.2 million, and 0.1 million antidilutive stock-based awards, respectively.

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Wesco sponsors a stock-based compensation plan. On May 27, 2021, the Company’s stockholders approved the WESCO International, Inc. 2021 Omnibus Incentive Plan (the “2021 Plan”). The 2021 Plan is administered by the Compensation Committee of the Company’s Board of Directors. The 2021 Plan was designed to be the successor plan to all prior stock-based compensation plans. Accordingly, no new awards may be granted under the Company’s 1999 Long-Term Incentive Plan, as amended and restated (the “1999 Plan”) or any other prior plan. Awards outstanding under any such prior plans will remain in full force and effect under such plans according to their respective terms. To the extent that any such award is forfeited, terminates, expires or lapses without being exercised, or is settled for cash, the shares subject to such award not delivered will again be available for awards under the 2021 Plan. The maximum number of shares of the Company’s common stock that may be granted pursuant to awards under the 2021 Plan is 2,150,000, less any shares issued under the 1999 Plan between March 31, 2021 and May 27, 2021. If any award granted under the 2021 Plan is forfeited, terminates, expires or lapses instead of being exercised, or is settled for cash, the shares subject to such award will again be available for grant under the 2021 Plan. Shares delivered by participants or withheld by the Company to pay all or a portion of the exercise price or withholding taxes with respect to stock option or stock appreciation right awards will not again be available for issuance. Shares delivered by participants or withheld by the Company to satisfy applicable tax withholding obligations with respect to restricted shares or restricted stock units will again be available for grant under the 2021 Plan. As of December 31, 2024, 1,565,398 shares of common stock were reserved under the 2021 Plan for future equity award grants. Stock-based compensation awards outstanding under Wesco’s plans comprise stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock options and stock-settled stock appreciation rights is determined using the Black-Scholes model. The fair value of restricted stock units and performance-based awards with performance conditions is determined by the grant-date closing price of Wesco’s common stock. The forfeiture assumption is based on Wesco’s historical participant behavior that is reviewed on at least an annual basis. For stock options and stock-settled stock appreciation rights that are exercised, and for restricted stock units and performance-based awards that vest, shares are issued out of Wesco’s outstanding common stock. Stock options and stock-settled stock appreciation rights vest ratably over a three-year period and terminate on the tenth anniversary of the grant date unless terminated sooner under certain conditions. Restricted stock unit awards that were granted under the 1999 Plan vested fully on the third anniversary of the date of grant. Restricted stock units awarded under the 2021 Plan typically vest ratably over a three-year period on each of the first, second and third anniversaries of the grant date. Vesting of performance-based awards is based on a three-year performance period, and the number of shares earned, if any, depends on the attainment of certain performance levels, as described below. Outstanding awards would vest upon the consummation of a change in control transaction with performance-based awards vesting at the target level. Performance-based awards are based on two equally-weighted performance measures: the three-year average growth rate of Wesco’s net income attributable to common stockholders and the three-year cumulative return on net assets. These awards are accounted for as awards with performance conditions; compensation cost is recognized over the performance period based upon Wesco’s determination of whether it is probable that the performance targets will be achieved. Wesco recognized $28.9 million, $48.1 million and $46.4 million of non-cash stock-based compensation expense for the years ended December 31, 2024, 2023 and 2022, respectively, which is included in selling, general and administrative expenses for all such periods. As of December 31, 2024, there was $52.6 million of total unrecognized compensation expense related to non-vested stock-based compensation arrangements for all awards previously made, which is expected to be recognized as follows: For the year ending December 31, (In millions) 2025 $ 29.6 2026 18.4 2027 4.2 2028 0.4 The aggregate intrinsic value of awards exercised and vested during the years ended December 31, 2024, 2023, and 2022 was $80.6 million, $172.8 million, and $68.3 million, respectively. The gross income tax benefit associated with the exercise of stock-based awards totaled $19.1 million, $40.8 million, and $15.8 million in 2024, 2023, and 2022, respectively. During the years ended December 31, 2024, 2023 and 2022, Wesco granted the following stock options, restricted stock units, and performance-based awards at the following weighted-average fair values: Year Ended December 31, 2024 2023 2022 Stock options granted 85,425 78,729 92,799 Weighted-average fair value $ 72.05 $ 76.69 $ 57.15 Restricted stock units granted 249,757 177,659 234,800 Weighted-average fair value $ 158.78 $ 169.65 $ 122.13 Performance-based awards granted (1) 194,599 212,656 83,991 Weighted-average fair value (1) $ 109.04 $ 87.04 $ 122.09 (1) As described further below, the year ended December 31, 2024 includes performance-based awards granted in February 2021 for which actual achievement levels were certified in February 2024, as well as performance-based awards granted during the year ended December 31, 2024. The fair values of stock options, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods: Year Ended December 31, 2024 2023 2022 Risk free interest rate 4.2% 4.1% 2.0% Expected life (in years) 5 5 7 Expected volatility 55% 50% 43% Expected dividend yield 1.09% 0.89% n/a The risk-free interest rate is based on the U.S. Treasury Daily Yield Curve rate as of the grant date. The expected life is based on historical exercise experience, the expected volatility is based on the volatility of the Company’s daily stock price over the expected life preceding the grant date of the award, and the expected dividend yield is based on the calculated yield on the Company’s common stock at date of grant using the current year projected dividend distribution rate. The Company did not pay dividends to holders of its common stock during the year ended December 31, 2022. The following table sets forth a summary of stock options and related information for the periods presented: Year Ended December 31, 2024 2023 2022 Awards Weighted-Average Weighted-Average Remaining Contractual Life (In years) Aggregate Awards Weighted-Average Awards Weighted- Average Exercise Price Beginning of year 163,082 $ 144.51 87,347 $ 121.55 — $ — Granted 85,425 152.07 78,729 169.72 92,799 121.58 Exercised (3,495) 128.40 (1,279) 122.09 — — Forfeited (10,198) 154.32 (1,715) 148.67 (5,452) 122.09 End of year 234,814 147.08 8.1 $ 8.0 163,082 144.51 87,347 121.55 Exercisable at end of year 78,399 $ 136.60 7.5 $ 3.5 28,411 $ 121.53 879 $ 122.09 For the year ended December 31, 2024, the aggregate intrinsic value of stock options exercised during such period was not material. The following table sets forth a summary of stock-settled stock appreciation rights and related information for the periods presented: Year Ended December 31, 2024 2023 2022 Awards Weighted-Average Weighted-Average Aggregate Awards Weighted-Average Awards Weighted-Average Beginning of year 818,284 $ 59.55 1,248,115 $ 62.02 1,370,388 $ 62.09 Granted — — — — — — Exercised (118,513) 63.29 (428,500) 66.70 (113,382) 61.90 Forfeited (727) 76.25 (1,331) 74.57 (8,891) 73.35 End of year 699,044 58.90 4.1 $ 85.3 818,284 59.55 1,248,115 62.02 Exercisable at end of year 699,044 $ 58.90 4.1 $ 85.3 777,479 $ 58.64 1,083,320 $ 61.91 For the year ended December 31, 2024, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $15.2 million. The following table sets forth a summary of restricted stock units and related information for the periods presented: Year Ended December 31, 2024 2023 2022 Awards Weighted-Average Awards Weighted-Average Awards Weighted-Average Unvested at beginning of year 407,613 $ 127.49 774,233 $ 73.79 974,162 $ 53.48 Granted 249,757 158.78 177,659 169.65 234,800 122.13 Vested (195,578) 115.66 (508,173) 59.72 (393,194) 53.13 Forfeited (34,222) 141.98 (36,106) 137.28 (41,535) 66.30 Unvested at end of year 427,570 $ 149.84 407,613 $ 127.49 774,233 $ 73.79 The following table sets forth a summary of performance-based awards and related information for the periods presented: Year Ended December 31, 2024 2023 2022 Awards Weighted-Average Awards Weighted-Average Awards Weighted-Average Unvested at beginning of year 254,859 $ 115.15 335,329 $ 75.26 380,819 $ 59.23 Granted (1) 194,599 109.04 212,656 87.04 83,991 122.09 Vested (223,042) 77.08 (289,394) 48.32 (115,394) 54.64 Forfeited (11,899) 151.11 (3,732) 111.00 (14,087) 60.75 Unvested at end of year 214,517 $ 147.19 254,859 $ 115.15 335,329 $ 75.26 (1)

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	From time to time, a number of lawsuits and claims have been or may be asserted against the Company relating to the conduct of its business, including litigation relating to commercial, product and employment matters. 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. As of December 31, 2024, the Company had $48.2 million in outstanding letters of credit and guarantees.

BUSINESS SEGMENTS

BUSINESS SEGMENTS	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
SEGMENTS AND RELATED INFORMATION	16. BUSINESS SEGMENTS The Company has operating segments comprising three strategic business units consisting of EES, CSS and UBS. These operating segments are equivalent to the Company’s reportable segments. The President and Chief Executive Officer serves as the Company’s Chief Operating Decision Maker (“CODM”). The Company incurs corporate costs primarily related to treasury, tax, information technology, legal and other centralized functions. The Company also has various corporate assets. Segment assets may not include jointly used assets, but segment results include depreciation expense or other allocations related to those assets. Interest expense and other non-operating items are either not allocated to the segments or reviewed on a segment basis. Corporate expenses and assets not directly identifiable with a reportable segment are reported in the tables below to reconcile the reportable segments to the consolidated financial statements. The following is a description of each of the Company’s reportable segments and their business activities. Electrical & Electronic Solutions The EES segment, with approximately 6,700 employees serving customers in over 50 countries, supplies a broad range of products and solutions primarily to construction, industrial and original equipment manufacturer (“OEM”) customers. The product portfolio in this business includes a broad range of electrical equipment and supplies, automation and connected devices (the “Internet of Things” or “IoT”), security, lighting, wire and cable, safety, and maintenance, repair and operating (“MRO”) products from industry-leading manufacturing partners. The EES service portfolio includes contractor solutions to improve project execution, direct and indirect manufacturing supply chain optimization programs, lighting and renewables advisory services, and digital and automation solutions to improve safety and productivity. Communications & Security Solutions The CSS segment, with approximately 4,700 employees serving customers in over 50 countries, is a global leader in data center, network infrastructure and security solutions. CSS sells directly to end-users or through an extensive network of channel partners, including data communications contractors, security and network integrators, professional audio/visual integrators, and systems integrators. Beyond its core portfolio, CSS provides a wide range of professional A/V, safety, facilities, and energy management solutions. The full CSS product portfolio is frequently paired with services designed to enhance efficiency and productivity across all customer segments globally. These services include data center services, advisory, installation enhancement, project deployment, supply chain solutions, and management platforms. Utility & Broadband Solutions The UBS segment, with approximately 2,300 employees serving customers primarily in the U.S. and Canada, provides products and services to investor-owned utilities, public power companies, including municipalities, as well as global service providers, wireless providers, broadband operators and the contractors that service these customers. The UBS segment divested Wesco’s integrated supply business on April 1, 2024. The products sold include wire and cable, transformers, transmission and distribution hardware, switches, protective devices, connectors, lighting, conduit, fiber and copper cable, connectivity products, pole line hardware, racks, cabinets, safety and MRO products, and point-to-point wireless devices. The UBS segment also offers a complete set of service solutions to improve customer supply chain efficiencies. The following tables present information about the Company’s reportable segments and reconcile adjusted EBITDA by segment, which is the Company’s measure of segment profit or loss, to income before income taxes on a consolidated basis for the periods presented: Year Ended December 31, 2024 (In millions) EES CSS UBS Reportable Segments Total Net sales $ 8,546.8 $ 7,537.0 $ 5,735.0 $ 21,818.8 Less: Cost of goods sold (excluding depreciation and amortization) 6,517.8 5,918.4 4,670.0 17,106.2 Selling, general and administrative payroll expenses (1)(3) 854.6 614.1 244.9 1,713.6 Other segment items (2) 456.9 383.4 176.7 1,017.0 Adjusted EBITDA $ 717.5 $ 621.1 $ 643.4 $ 1,982.0 Adjusted EBITDA margin % 8.4 % 8.2 % 11.2 % Reconciliation of adjusted EBITDA Depreciation and amortization 146.8 Other income, net (50.9) Stock-based compensation expense (3) 14.1 Unallocated amounts (Corporate): Depreciation and amortization 36.4 Selling, general and administrative expenses 561.5 Interest expense, net (4) 364.9 Other income, net (41.8) Income before income taxes $ 951.0 (1) Selling, general and administrative payroll expenses includes salaries, benefits, commissions, incentives, temporary labor, and other payroll expenses. (2) Other segment items primarily includes allocated expenses (which includes employee-related allocations), transportation costs, facility costs (including rent and utilities), employee expenses (including travel and entertainment), credit losses, professional and consulting fees, supplies, real estate and personal property taxes, sales promotion expenses, and gains (losses) on the sale, disposal, or abandonment of property and equipment. (3) Stock-based compensation expense is excluded from selling, general and administrative payroll expenses, as this is an adjustment to calculate adjusted EBITDA. (4) The reportable segments do not incur interest expense as these costs are centrally controlled through the Corporate treasury function. Year Ended December 31, 2023 (In millions) EES CSS UBS Reportable Segments Total Net sales $ 8,610.3 $ 7,152.2 $ 6,622.7 $ 22,385.2 Less: Cost of goods sold (excluding depreciation and amortization) 6,576.2 5,524.6 5,440.7 17,541.5 Selling, general and administrative payroll expenses (1)(3) 872.2 594.0 275.5 1,741.7 Other segment items (2) 434.5 349.8 167.2 951.5 Adjusted EBITDA $ 727.4 $ 683.8 $ 739.3 $ 2,150.5 Adjusted EBITDA margin % 8.4 % 9.6 % 11.2 % Reconciliation of adjusted EBITDA Depreciation and amortization 140.0 Other expense, net 82.9 Stock-based compensation expense (3) 14.2 Unallocated amounts (Corporate): Depreciation and amortization 41.3 Selling, general and administrative expenses 548.6 Interest expense, net (4) 389.3 Other income, net (57.8) Income before income taxes $ 992.0 (1) Selling, general and administrative payroll expenses includes salaries, benefits, commissions, incentives, temporary labor, and other payroll expenses. (2) Other segment items primarily includes allocated expenses (which includes employee-related allocations), transportation costs, facility costs (including rent and utilities), employee expenses (including travel and entertainment), credit losses, professional and consulting fees, supplies, real estate and personal property taxes, sales promotion expenses, and gains (losses) on the sale, disposal, or abandonment of property and equipment. (3) Stock-based compensation expense is excluded from selling, general and administrative payroll expenses, as this is an adjustment to calculate adjusted EBITDA. (4) The reportable segments do not incur interest expense as these costs are centrally controlled through the Corporate treasury function. Year Ended December 31, 2022 (In millions) EES CSS UBS Reportable Segments Total Net sales $ 8,823.3 $ 6,401.5 $ 6,195.3 $ 21,420.1 Less: Cost of goods sold (excluding depreciation and amortization) 6,708.0 4,944.5 5,106.3 16,758.8 Selling, general and administrative payroll expenses (1)(3) 822.1 516.7 264.0 1,602.8 Other segment items (2) 441.9 341.3 147.7 930.9 Adjusted EBITDA $ 851.3 $ 599.0 $ 677.3 $ 2,127.6 Adjusted EBITDA margin % 9.6 % 9.4 % 10.9 % Reconciliation of adjusted EBITDA Depreciation and amortization 134.3 Other income, net (1.3) Stock-based compensation expense (3) 17.6 Unallocated amounts (Corporate): Depreciation and amortization 44.7 Selling, general and administrative expenses 492.9 Interest expense, net (4) 294.4 Other expense, net 8.3 Income before income taxes $ 1,136.7 (1) Selling, general and administrative payroll expenses includes salaries, benefits, commissions, incentives, temporary labor, and other payroll expenses. (2) Other segment items primarily includes allocated expenses (which includes employee-related allocations), transportation costs, facility costs (including rent and utilities), employee expenses (including travel and entertainment), credit losses, professional and consulting fees, supplies, real estate and personal property taxes, sales promotion expenses, and gains (losses) on the sale, disposal, or abandonment of property and equipment. (3) Stock-based compensation expense is excluded from selling, general and administrative payroll expenses, as this is an adjustment to calculate adjusted EBITDA. (4) The reportable segments do not incur interest expense as these costs are centrally controlled through the Corporate treasury function. The following table sets forth depreciation and amortization by reportable segment for the periods presented: Year Ended December 31, (In millions) 2024 2023 2022 EES $ 46.8 $ 43.3 $ 42.6 CSS 71.5 71.7 68.4 UBS 28.5 25.0 23.3 Reportable segments total 146.8 140.0 134.3 Corporate 36.4 41.3 44.7 Total $ 183.2 $ 181.3 $ 179.0 The following table sets forth other (income) expense, net by reportable segment for the periods presented, which primarily consists of net foreign currency exchange (gains) losses and the gain on the divestiture of the WIS business: Year Ended December 31, (In millions) 2024 2023 2022 EES $ 10.5 $ 10.1 $ (2.0) CSS 59.8 74.2 (1.3) UBS (121.2) (1.4) 2.0 Reportable segments total (50.9) 82.9 (1.3) Corporate (41.8) (57.8) 8.3 Total $ (92.7) $ 25.1 $ 7.0 The following table sets forth capital expenditures by reportable segment for the periods presented: Year Ended December 31, (In millions) 2024 2023 2022 EES $ 4.5 $ 10.3 $ 9.1 CSS 19.2 7.9 4.8 UBS 15.8 19.5 9.2 Reportable segments total 39.5 37.7 23.1 Corporate 55.2 54.6 76.4 Total $ 94.7 $ 92.3 $ 99.4 The following table sets forth total assets by reportable segment for the periods presented: As of December 31, (In millions) 2024 2023 EES $ 4,457.0 $ 4,553.6 CSS 6,009.5 5,626.6 UBS 3,497.5 3,908.5 Reportable segments total 13,964.0 14,088.7 Corporate (1) 1,097.4 972.2 Total $ 15,061.4 $ 15,060.9 (1) Total assets for Corporate primarily consist of cash and cash equivalents, deferred income taxes, property, buildings and equipment, capitalized cloud computing arrangement costs, operating lease assets, and pension assets. The following table sets forth tangible long-lived assets, which include property, buildings and equipment, and operating lease assets, by geographic area: As of December 31, 2024 2023 (In millions) United States $ 893.9 $ 906.5 Canada 177.5 182.1 Other International (1) 106.6 96.2 Total $ 1,178.0 $ 1,184.8 (1) No individual other international country’s tangible long-lived assets are material.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	Schedule II—Valuation and Qualifying Accounts Balance at Charged to Balance at of period earnings Deductions (1) end of period Allowance for expected credit losses (In millions) Year Ended December 31, 2024 $ 55.9 $ 18.7 $ (19.6) $ 55.0 Year Ended December 31, 2023 46.5 18.6 (9.2) 55.9 Year Ended December 31, 2022 41.7 18.0 (13.2) 46.5 (1) Includes a reduction in the allowance for expected credit losses due to the write-off of trade accounts receivable. Balance at Charged to Balance at of period earnings Deductions (1) end of period Allowance for deferred tax assets (In millions) Year Ended December 31, 2024 $ 23.5 $ 10.3 $ (1.2) $ 32.6 Year Ended December 31, 2023 33.7 7.7 (17.9) 23.5 Year Ended December 31, 2022 46.3 5.8 (18.4) 33.7 (1) For the years ended December 31, 2024 and December 31, 2023, deductions primarily relate to a decrease in the valuation allowance recorded against deferred tax assets related to certain foreign jurisdictions. For the year ended December 31, 2022, deductions primarily relate to a decrease in the valuation allowance recorded against deferred tax assets related to foreign tax credit carryforwards.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income attributable to WESCO International, Inc.	$ 717.6	$ 765.5	$ 860.5

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Accounting Policies (Policies)

Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Basis of Presentation The consolidated financial statements include the accounts of Wesco International and all of its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. In 2023 we changed our presentation in tables from thousands to millions. Certain amounts as of December 31, 2024 and 2023 and for the years ended December 31, 2024, 2023 and 2022 in the consolidated financial statements and associated notes may not foot or recalculate due to rounding. Reclassifications The Consolidated Statements of Cash Flows and the reconciliation between the federal statutory income tax rate and the effective tax rate in Note 11, “Income Taxes” for the years ended December 31, 2023 and 2022 include certain reclassifications to previously reported amounts to conform to the current period’s presentation. The table of deferred tax assets and liabilities in Note 11, “Income Taxes” for the year ended December 31, 2023 also includes certain reclassifications to previously reported amounts to conform to the current period’s presentation. Such reclassifications had no impact on the totals of operating, investing and financing cash flow activities, the effective tax rates, or totals of the deferred tax assets and liabilities for those years. Use of Estimates The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Although these estimates are based on management’s best knowledge of current events and actions Wesco may undertake in the future, actual results may ultimately differ from the estimates. Revenue Recognition Wesco’s revenue arrangements generally consist of single performance obligations to transfer a promised good or service, or a combination of goods and services. Revenue is measured as the amount of consideration Wesco expects to receive in exchange for transferring goods or providing services. Revenue is recognized when control has transferred to the customer, which is generally when the product has shipped from a Wesco facility or directly from a supplier. However, transfer may occur at a later date depending on the agreed upon terms, such as delivery at the customer’s designated location, or based on consignment terms. For products that ship directly from suppliers to customers, Wesco generally acts as the principal in the transaction and recognizes revenue on a gross basis. When providing services, sales are generally recognized over time as control transfers to the customer, which occurs as services are rendered. Wesco generally satisfies its performance obligations within a year or less. Wesco generally does not have significant financing terms associated with its contractual arrangements; payments are normally received within 60 days. There are generally no significant costs associated with obtaining customer contracts. Wesco typically passes through warranties offered by manufacturers or suppliers to its customers. Sales taxes (and value added taxes in foreign jurisdictions) collected from customers and remitted to governmental authorities are excluded from net sales. Supplier Volume Rebates Wesco receives volume rebates from certain suppliers based on contractual arrangements with such suppliers. Volume rebates are included within other accounts receivable in the Consolidated Balance Sheets, and represent the estimated amounts due to Wesco based on forecasted purchases and the rebate provisions of the various supplier contracts. The Company’s volume rebate arrangements with suppliers are generally for the period of January 1 through December 31. The corresponding rebate income is recorded as a reduction to cost of goods sold. Receivables under the supplier rebate program were $210.0 million at December 31, 2024 and $233.1 million at December 31, 2023. Supplier volume rebate income as a percentage of net sales was 1.3% in 2024, 1.4% in 2023 and 1.6% in 2022. Supplier Finance Programs The Company has supplier finance programs that are administered by intermediaries. Under these arrangements, participating suppliers may elect to receive early payment of invoices that have been confirmed by the Company, less an interest deduction or fees paid by the supplier, which is paid to the supplier by third-party finance providers. Wesco agrees to pay the stated amount of confirmed invoices in full on the original due date of the invoices, which is typically within 45 to 180 days of the invoice date, regardless of whether the supplier elects to receive early payment from the third-party finance providers. The Company does not provide assets pledged as security or other forms of guarantees to the finance providers or intermediaries under these arrangements. During the fourth quarter of 2024, the Company finalized the termination of one of its supplier finance programs and settled all obligations under the program. As of December 31, 2024 and 2023, the amounts due to suppliers that participate in the Company’s supplier finance programs were approximately $ 12.4 million 32.6 million The following table sets forth the rollforward of outstanding obligations confirmed as valid under the Company’s supplier finance programs for the year ended December 31, 2024: (In millions) 2024 Confirmed obligations outstanding at the beginning of the year $ 32.6 Invoices confirmed during the year 106.0 Confirmed invoices paid during the year (126.2) Confirmed obligations outstanding at the end of the year $ 12.4 Cash and Cash Equivalents Cash equivalents are defined as highly liquid investments with original maturities of 90 days or less when purchased. Cash and cash equivalents in the Consolidated Balance Sheets include $19.7 million and $21.9 million as of December 31, 2024 and 2023, respectively, that is restricted from use to fund operations. Allowance for Expected Credit Losses Wesco recognizes expected credit losses resulting from the inability of its customers to make required payments through an allowance account that is measured each reporting period. Wesco estimates credit losses over the life of its trade accounts receivable using a combination of historical loss data, current credit conditions, specific customer circumstances, and reasonable and supportable forecasts of future economic conditions. The allowance for expected credit losses was $55.0 million and $55.9 million at December 31, 2024 and 2023, respectively. The total amount recorded as selling, general and administrative expense related to credit losses was $18.7 million, $18.6 million and $18.0 million for 2024, 2023 and 2022, respectively. Inventories Inventories primarily consist of merchandise purchased for resale and are stated at the lower of cost or net realizable value. Cost is determined principally under the average cost method. Wesco reduces the carrying value of its inventories at the earlier of identifying an item that is considered to be obsolete or in excess of supply relative to demand, or no movement in a prescribed number of months. The carrying value of inventories reflect reductions for excess and obsolescence of $131.3 million and $113.4 million at December 31, 2024 and 2023, respectively. The total expense related to excess and obsolete inventories, which is included in cost of goods sold, was $66.0 million, $63.1 million and $43.2 million for 2024, 2023 and 2022, respectively. Property, Buildings and Equipment Property, buildings and equipment are recorded at cost. Depreciation expense is determined using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over either their respective lease terms or their estimated lives, whichever is shorter. Estimated useful lives typically range from five to forty years for buildings and leasehold improvements and three to eight years for furniture, fixtures and equipment. Costs incurred during the application development stage of internally developed software are capitalized and are reported at the lower of unamortized cost or net realizable value. Costs incurred during the preliminary project and post-implementation stages are expensed as incurred. Capitalized costs include external direct costs of materials and services consumed in developing internal-use computer software, payroll and payroll-related costs for employees who are directly associated with and who devote time to the internal-use computer software project, as well as interest costs. Internal-use computer software is amortized using the straight-line method over its estimated useful life, typically three to seven years. Expenditures for new facilities and improvements that extend the useful life of an asset are capitalized. Ordinary repairs and maintenance are expensed as incurred. When property or other long-lived assets are retired, abandoned, or otherwise disposed, the cost and the related accumulated depreciation are removed from the accounts and any resulting gains or losses are recorded and reported as selling, general and administrative expenses. Of Wesco’s $442.9 million net book value of property, buildings and equipment as of December 31, 2024, $183.1 million consists of land, buildings and leasehold improvements that are geographically dispersed among Wesco’s more than 700 sites, including distribution centers, fulfillment centers, and sales offices, mitigating the risk of impairment. Wesco assesses its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of any such assets may not be fully recoverable. Changes in circumstances include, among others, technological advances, changes in the business model, capital structure, economic conditions or operating performance. The evaluation is based upon, among other things, utilization, serviceability and assumptions developed by management, which are categorized as Level 3 of the fair value hierarchy, related to the estimated future undiscounted cash flows that these assets are expected to generate. When the sum of the undiscounted cash flows is less than the carrying value of the asset (asset group), an impairment loss is recognized to the extent that carrying value exceeds fair value. Management applies its best judgment when performing these evaluations. Leases 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 has elected the short-term lease measurement and recognition exemption; therefore, leases with an initial term of twelve months or less are not recorded on the balance sheet. Operating lease expense is recognized on a straight-line basis over the lease term. Operating lease assets and liabilities are recognized at the commencement date based on the present value of the future minimum lease payments. Certain leases contain rent escalation clauses that are either fixed or adjusted periodically for inflation or market rates and such clauses are factored into the Company’s determination of lease payments. Wesco also has variable lease payments that do not depend on a rate or index, primarily for items such as common area maintenance and real estate taxes, which are recorded as variable expense when incurred. The operating lease asset includes advance payments and excludes incentives and initial direct costs incurred. 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 non-lease 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, or terminate early. 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. For most of Wesco’s leases, the discount rate implicit in the lease is not readily determinable. Accordingly, the Company uses its incremental borrowing rate on a secured basis based on the information available at the lease commencement date to discount lease payments to the present value. Goodwill and Indefinite-Lived Intangible Assets Goodwill and indefinite-lived intangible assets are tested for impairment annually as of October 1, or more frequently if triggering events occur, indicating that their carrying value may not be recoverable. Wesco tests for goodwill impairment on a reporting unit level. We have the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit or indefinite-lived intangible asset is less than its carrying value as a basis for determining whether it is necessary to perform quantitative impairment tests. If performing a qualitative assessment, the Company assesses factors, including macroeconomic conditions, industry and market considerations, cost factors, overall financial performance, other relevant events such as changes in key personnel, changes in the composition or carrying amount of the net assets of a reporting unit, and changes in share price, among others, to determine whether it is more likely than not that the fair value of Wesco’s reporting units are less than their carrying values. If the qualitative assessment indicates that the fair values of the Company’s reporting units or indefinite-lived intangible assets may not exceed their respective carrying values, or if the Company elects to bypass the optional qualitative assessments, then Wesco performs quantitative tests for impairment by comparing the fair value of each reporting unit or indefinite-lived intangible asset to its carrying value. The Company determines the fair values of its reporting units using a discounted cash flow analysis and consideration of market multiples. The discounted cash flow analysis uses certain assumptions, including projected revenues and expected operating margins supported by a combination of historical results, current forecasts, market data and recent economic events, which are categorized within Level 3 of the fair value hierarchy. The Company uses a discount rate that reflects market participants’ cost of capital. The Company evaluates the recoverability of indefinite-lived intangible assets using the relief-from-royalty method based on projected financial information. The relief-from-royalty method uses certain assumptions including projected revenues, discount rates, royalty rates, and applicable income tax rates. At December 31, 2024 and 2023, goodwill and indefinite-lived intangible assets totaled $4.1 billion. The determination of fair value involves significant management judgment, particularly as it relates to the underlying assumptions and factors around projected revenues, future expected operating margins and discount rate. Management applies its best judgment when assessing the reasonableness of financial projections. Fair values are sensitive to changes in underlying assumptions and factors. As a result, there can be no assurance that the estimates and assumptions made for purposes of the annual goodwill and indefinite-lived intangible assets impairment tests will prove to be an accurate prediction of future results. Definite-Lived Intangible Assets Definite-lived intangible assets are amortized over five twenty Cloud Computing Arrangements The Company capitalizes costs associated with implementing its various cloud computing arrangements, which are amortized using the straight-line method over the estimated useful life, typically three to seven years. Capitalized implementation costs, which are recorded as a component of other assets in the Consolidated Balance Sheets, were $257.8 million and $195.4 million as of December 31, 2024 and 2023, respectively, and the related accumulated amortization was $29.6 million and $15.5 million, respectively. Amortization expense related to cloud computing arrangements totaled $14.1 million, $9.2 million and $4.0 million for the years ended December 31, 2024, 2023 and 2022, respectively. During the second quarter of 2024, management determined that a third-party developed operations management software product would be abandoned in favor of an application that better suits the Company’s operations and the Company recognized a $17.8 million loss on abandonment of assets, which is recorded as a component of selling, general and administrative expenses in the Consolidated Statement of Income and Comprehensive Income for the year ended December 31, 2024. Insurance Programs Wesco uses commercial insurance for auto, workers’ compensation, casualty and health claims, and information technology as a risk-reduction strategy to minimize catastrophic losses. The Company’s strategy involves large deductible policies where Wesco must pay all costs up to the deductible amount. Wesco estimates the reserve for these programs based on historical incident rates and costs. The assumptions included in developing this accrual include the period of time between the incurrence and payment of a claim. The total liability related to insurance programs was $33.4 million and $28.1 million at December 31, 2024 and 2023, respectively. Income Taxes Wesco accounts for income taxes under the asset and liability method, which requires the recognition of deferred income taxes for events that have future tax consequences. Under this method, deferred income taxes are recognized (using enacted tax laws and rates) based on the future income tax effects of differences in the carrying amounts of assets and liabilities for financial reporting and tax purposes. The effect of a tax rate change on deferred tax assets and liabilities is recognized in income in the period of change. Wesco recognizes deferred tax assets consistent with amounts expected to be realized. To make such determination, management evaluates all positive and negative evidence, including but not limited to, prior, current and future taxable income, tax planning strategies and future reversals of existing taxable temporary differences. A valuation allowance is recognized if it is “more-likely-than-not” that some or all of a deferred tax asset will not be realized. Wesco regularly assesses the realizability of deferred tax assets. Wesco accounts for uncertainty in income taxes using a “more-likely-than-not” recognition threshold. Due to the subjectivity inherent in the evaluation of uncertain tax positions, the tax benefit ultimately recognized may materially differ from the estimate recognized in the consolidated financial statements. Wesco recognizes interest and penalties related to uncertain tax benefits as part of interest expense and income tax expense, respectively. The Tax Cuts and Jobs Act of 2017 (the “TCJA”) imposed a one-time tax on the deemed repatriation of undistributed foreign earnings (the “transition tax”). Except for a portion of foreign earnings previously taxed in the U.S. that can effectively be distributed without further material U.S. or foreign taxation, the Company continues to assert that the undistributed earnings of its foreign subsidiaries are indefinitely reinvested. To the extent the earnings of the Company’s foreign subsidiaries are distributed in the form of dividends, such earnings may be subject to additional taxes. The Company believes that it is able to maintain a sufficient level of liquidity for its domestic operations and commitments without incurring any material tax cost to repatriate cash held by its foreign subsidiaries. The provisions of the TCJA also introduced U.S. taxation on certain global intangible low-taxed income (“GILTI”). Wesco has elected to account for GILTI tax as a component of income tax expense. Foreign Currency The functional currency for most of the Company’s operations outside the U.S. is generally the applicable local currency. Assets and liabilities of these operations are translated to U.S. dollars at the exchange rate in effect at the end of each period. Income statement accounts are translated at an exchange rate that approximates the average for the period. Translation adjustments arising from the use of differing exchange rates from period to period are included as a component of accumulated other comprehensive income (loss) within stockholders’ equity. Gains and losses from foreign currency transactions are included in net income for the period. The Company may re-evaluate the functional currencies of certain operations outside the U.S. if there are significant changes to operations that indicate that a change in functional currency may be necessary. Defined Benefit Pension Plans Liabilities and expenses for defined benefit pension plans are determined using actuarial methodologies and incorporate significant assumptions, including the interest rate used to discount the future estimated cash flows, the expected long-term rate of return on plan assets, and several assumptions relating to the employee workforce (salary increases, retirement age, and mortality). Unrealized gains and losses related to the Company’s defined benefit pension obligations are recognized as a component of accumulated other comprehensive income (loss) within stockholders’ equity. Gains or losses resulting from plan amendments, curtailments, and settlements are recognized as a component of other non-operating income and expenses (“other expense (income), net”) in the period of the remeasurement. Fair Value of Financial Instruments The Company measures the fair value of assets and liabilities on a recurring and nonrecurring basis according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of the fair value hierarchy are as follows: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible at the measurement date; Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, and Level 3 inputs are unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to measurements involving significant unobservable inputs (Level 3). The Company measures the fair values of goodwill, intangible assets and property, buildings and equipment on a nonrecurring basis if required by impairment tests applicable to these assets, as described above. Other (Income) Expense, net Other non-operating income and expenses (“other (income) expense, net”) primarily includes the non-service cost components of net periodic pension cost (benefit), foreign exchange gains and losses, and periodic, non-operating transactions. For the year ended December 31, 2024, these periodic, non-operating transactions included the divestiture of the Wesco Integrated Supply (“WIS”) business, which resulted in a gain from the sale of $122.2 million, described further in Note 5, “Acquisitions and Divestitures”. Recently Adopted and Recently Issued Accounting Standards In September 2022, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2022-04, Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations , which requires that a buyer in a supplier finance program disclose sufficient information about the program to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude. The amendments in this ASU are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. The Company adopted this ASU in the first quarter of 2023, except for the amendment on rollforward information, which the Company adopted in the fourth quarter of 2024. The adoption of this ASU resulted in additional disclosure of the Company’s supplier finance programs. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which enhances prior reportable segment disclosure requirements in part by requiring entities to disclose significant expenses related to their reportable segments. The amendments in this ASU are effective on a retrospective basis for annual periods beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The Company adopted this ASU in the fourth quarter of 2024. The adoption of this ASU resulted in additional required disclosures, including the disclosure of certain expenses at the reportable segment level, described further in Note 16, “Business Segments”. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as information on income taxes paid to enhance the transparency and decision usefulness of income tax disclosures. The amendments in this ASU are effective for annual periods beginning after December 15, 2024 on a prospective basis. Management is currently evaluating the impact that this accounting standard will have on its consolidated financial statements and notes thereto. In March 2024, the SEC issued final climate-related disclosure rules requiring disclosure of material climate-related risks, board and management governance of such risks, and material direct and indirect greenhouse gas emissions. The rules also require disclosure in the notes to the financial statements of the effects of severe weather events and other natural conditions. Disclosures will be made prospectively, with phased-in effective dates starting with fiscal years beginning on or after January 1, 2025. In April 2024, the SEC voluntarily stayed implementation of the climate-related disclosure rules, pending completion of judicial review of consolidated challenges to the rules by the Court of Appeals for the Eighth Circuit. Management is currently evaluating the impact that these rules could have on its consolidated financial statements and notes thereto. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses , which is intended to enhance expense disclosures, primarily by requiring disclosure of disaggregated information about certain income statement expense line items on an annual and interim basis. The amendments in this ASU are effective for fiscal years beginning after December 15, 2026 and interim periods within fiscal years beginning after December 15, 2027. The amendments in this ASU should be applied prospectively; however, retrospective application is permitted. Management is currently evaluating the impact that this accounting standard will have 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.
Basis of Consolidation	Basis of Presentation The consolidated financial statements include the accounts of Wesco International and all of its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. In 2023 we changed our presentation in tables from thousands to millions. Certain amounts as of December 31, 2024 and 2023 and for the years ended December 31, 2024, 2023 and 2022 in the consolidated financial statements and associated notes may not foot or recalculate due to rounding.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Although these estimates are based on management’s best knowledge of current events and actions Wesco may undertake in the future, actual results may ultimately differ from the estimates.
Revenue Recognition	Revenue Recognition Wesco’s revenue arrangements generally consist of single performance obligations to transfer a promised good or service, or a combination of goods and services. Revenue is measured as the amount of consideration Wesco expects to receive in exchange for transferring goods or providing services. Revenue is recognized when control has transferred to the customer, which is generally when the product has shipped from a Wesco facility or directly from a supplier. However, transfer may occur at a later date depending on the agreed upon terms, such as delivery at the customer’s designated location, or based on consignment terms. For products that ship directly from suppliers to customers, Wesco generally acts as the principal in the transaction and recognizes revenue on a gross basis. When providing services, sales are generally recognized over time as control transfers to the customer, which occurs as services are rendered. Wesco generally satisfies its performance obligations within a year or less. Wesco generally does not have significant financing terms associated with its contractual arrangements; payments are normally received within 60 days. There are generally no significant costs associated with obtaining customer contracts. Wesco typically passes through warranties offered by manufacturers or suppliers to its customers. Sales taxes (and value added taxes in foreign jurisdictions) collected from customers and remitted to governmental authorities are excluded from net sales.
Cost of Goods and Service	Supplier Volume Rebates Wesco receives volume rebates from certain suppliers based on contractual arrangements with such suppliers. Volume rebates are included within other accounts receivable in the Consolidated Balance Sheets, and represent the estimated amounts due to Wesco based on forecasted purchases and the rebate provisions of the various supplier contracts. The Company’s volume rebate arrangements with suppliers are generally for the period of January 1 through December 31. The corresponding rebate income is recorded as a reduction to cost of goods sold. Receivables under the supplier rebate program were $210.0 million at December 31, 2024 and $233.1 million at December 31, 2023. Supplier volume rebate income as a percentage of net sales was 1.3% in 2024, 1.4% in 2023 and 1.6% in 2022.
Cash Equivalents	Cash and Cash Equivalents Cash equivalents are defined as highly liquid investments with original maturities of 90 days or less when purchased. Cash and cash equivalents in the Consolidated Balance Sheets include $19.7 million and $21.9 million as of December 31, 2024 and 2023, respectively, that is restricted from use to fund operations.
Allowance for Doubtful Accounts	Allowance for Expected Credit Losses
Inventories	Inventories Inventories primarily consist of merchandise purchased for resale and are stated at the lower of cost or net realizable value. Cost is determined principally under the average cost method. Wesco reduces the carrying value of its inventories at the earlier of identifying an item that is considered to be obsolete or in excess of supply relative to demand, or no movement in a prescribed number of months. The carrying value of inventories reflect reductions for excess and obsolescence of $131.3 million and $113.4 million at December 31, 2024 and 2023, respectively. The total expense related to excess and obsolete inventories, which is included in cost of goods sold, was $66.0 million, $63.1 million and $43.2 million for 2024, 2023 and 2022, respectively.
Property, Buildings and Equipment	Property, Buildings and Equipment Property, buildings and equipment are recorded at cost. Depreciation expense is determined using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over either their respective lease terms or their estimated lives, whichever is shorter. Estimated useful lives typically range from five to forty years for buildings and leasehold improvements and three to eight years for furniture, fixtures and equipment. Costs incurred during the application development stage of internally developed software are capitalized and are reported at the lower of unamortized cost or net realizable value. Costs incurred during the preliminary project and post-implementation stages are expensed as incurred. Capitalized costs include external direct costs of materials and services consumed in developing internal-use computer software, payroll and payroll-related costs for employees who are directly associated with and who devote time to the internal-use computer software project, as well as interest costs. Internal-use computer software is amortized using the straight-line method over its estimated useful life, typically three to seven years. Expenditures for new facilities and improvements that extend the useful life of an asset are capitalized. Ordinary repairs and maintenance are expensed as incurred. When property or other long-lived assets are retired, abandoned, or otherwise disposed, the cost and the related accumulated depreciation are removed from the accounts and any resulting gains or losses are recorded and reported as selling, general and administrative expenses. Of Wesco’s $442.9 million net book value of property, buildings and equipment as of December 31, 2024, $183.1 million consists of land, buildings and leasehold improvements that are geographically dispersed among Wesco’s more than 700 sites, including distribution centers, fulfillment centers, and sales offices, mitigating the risk of impairment. Wesco assesses its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of any such assets may not be fully recoverable. Changes in circumstances include, among others, technological advances, changes in the business model, capital structure, economic conditions or operating performance. The evaluation is based upon, among other things, utilization, serviceability and assumptions developed by management, which are categorized as Level 3 of the fair value hierarchy, related to the estimated future undiscounted cash flows that these assets are expected to generate. When the sum of the undiscounted cash flows is less than the carrying value of the asset (asset group), an impairment loss is recognized to the extent that carrying value exceeds fair value. Management applies its best judgment when performing these evaluations.
Lessee, Leases	Leases 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 has elected the short-term lease measurement and recognition exemption; therefore, leases with an initial term of twelve months or less are not recorded on the balance sheet. Operating lease expense is recognized on a straight-line basis over the lease term. Operating lease assets and liabilities are recognized at the commencement date based on the present value of the future minimum lease payments. Certain leases contain rent escalation clauses that are either fixed or adjusted periodically for inflation or market rates and such clauses are factored into the Company’s determination of lease payments. Wesco also has variable lease payments that do not depend on a rate or index, primarily for items such as common area maintenance and real estate taxes, which are recorded as variable expense when incurred. The operating lease asset includes advance payments and excludes incentives and initial direct costs incurred. 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 non-lease 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, or terminate early. 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. For most of Wesco’s leases, the discount rate implicit in the lease is not readily determinable. Accordingly, the Company uses its incremental borrowing rate on a secured basis based on the information available at the lease commencement date to discount lease payments to the present value.
Goodwill and Intangible Assets	Goodwill and Indefinite-Lived Intangible Assets Goodwill and indefinite-lived intangible assets are tested for impairment annually as of October 1, or more frequently if triggering events occur, indicating that their carrying value may not be recoverable. Wesco tests for goodwill impairment on a reporting unit level. We have the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit or indefinite-lived intangible asset is less than its carrying value as a basis for determining whether it is necessary to perform quantitative impairment tests. If performing a qualitative assessment, the Company assesses factors, including macroeconomic conditions, industry and market considerations, cost factors, overall financial performance, other relevant events such as changes in key personnel, changes in the composition or carrying amount of the net assets of a reporting unit, and changes in share price, among others, to determine whether it is more likely than not that the fair value of Wesco’s reporting units are less than their carrying values. If the qualitative assessment indicates that the fair values of the Company’s reporting units or indefinite-lived intangible assets may not exceed their respective carrying values, or if the Company elects to bypass the optional qualitative assessments, then Wesco performs quantitative tests for impairment by comparing the fair value of each reporting unit or indefinite-lived intangible asset to its carrying value. The Company determines the fair values of its reporting units using a discounted cash flow analysis and consideration of market multiples. The discounted cash flow analysis uses certain assumptions, including projected revenues and expected operating margins supported by a combination of historical results, current forecasts, market data and recent economic events, which are categorized within Level 3 of the fair value hierarchy. The Company uses a discount rate that reflects market participants’ cost of capital. The Company evaluates the recoverability of indefinite-lived intangible assets using the relief-from-royalty method based on projected financial information. The relief-from-royalty method uses certain assumptions including projected revenues, discount rates, royalty rates, and applicable income tax rates. At December 31, 2024 and 2023, goodwill and indefinite-lived intangible assets totaled $4.1 billion. The determination of fair value involves significant management judgment, particularly as it relates to the underlying assumptions and factors around projected revenues, future expected operating margins and discount rate. Management applies its best judgment when assessing the reasonableness of financial projections. Fair values are sensitive to changes in underlying assumptions and factors. As a result, there can be no assurance that the estimates and assumptions made for purposes of the annual goodwill and indefinite-lived intangible assets impairment tests will prove to be an accurate prediction of future results.
Definite Lived Intangible Assets	Definite-Lived Intangible Assets Definite-lived intangible assets are amortized over five twenty
Insurance Programs	Insurance Programs Wesco uses commercial insurance for auto, workers’ compensation, casualty and health claims, and information technology as a risk-reduction strategy to minimize catastrophic losses. The Company’s strategy involves large deductible policies where Wesco must pay all costs up to the deductible amount. Wesco estimates the reserve for these programs based on historical incident rates and costs. The assumptions included in developing this accrual include the period of time between the incurrence and payment of a claim. The total liability related to insurance programs was $33.4 million and $28.1 million at December 31, 2024 and 2023, respectively.
Income Taxes	Income Taxes Wesco accounts for income taxes under the asset and liability method, which requires the recognition of deferred income taxes for events that have future tax consequences. Under this method, deferred income taxes are recognized (using enacted tax laws and rates) based on the future income tax effects of differences in the carrying amounts of assets and liabilities for financial reporting and tax purposes. The effect of a tax rate change on deferred tax assets and liabilities is recognized in income in the period of change. Wesco recognizes deferred tax assets consistent with amounts expected to be realized. To make such determination, management evaluates all positive and negative evidence, including but not limited to, prior, current and future taxable income, tax planning strategies and future reversals of existing taxable temporary differences. A valuation allowance is recognized if it is “more-likely-than-not” that some or all of a deferred tax asset will not be realized. Wesco regularly assesses the realizability of deferred tax assets. Wesco accounts for uncertainty in income taxes using a “more-likely-than-not” recognition threshold. Due to the subjectivity inherent in the evaluation of uncertain tax positions, the tax benefit ultimately recognized may materially differ from the estimate recognized in the consolidated financial statements. Wesco recognizes interest and penalties related to uncertain tax benefits as part of interest expense and income tax expense, respectively. The Tax Cuts and Jobs Act of 2017 (the “TCJA”) imposed a one-time tax on the deemed repatriation of undistributed foreign earnings (the “transition tax”). Except for a portion of foreign earnings previously taxed in the U.S. that can effectively be distributed without further material U.S. or foreign taxation, the Company continues to assert that the undistributed earnings of its foreign subsidiaries are indefinitely reinvested. To the extent the earnings of the Company’s foreign subsidiaries are distributed in the form of dividends, such earnings may be subject to additional taxes. The Company believes that it is able to maintain a sufficient level of liquidity for its domestic operations and commitments without incurring any material tax cost to repatriate cash held by its foreign subsidiaries. The provisions of the TCJA also introduced U.S. taxation on certain global intangible low-taxed income (“GILTI”). Wesco has elected to account for GILTI tax as a component of income tax expense.
Foreign Currency	Foreign Currency The functional currency for most of the Company’s operations outside the U.S. is generally the applicable local currency. Assets and liabilities of these operations are translated to U.S. dollars at the exchange rate in effect at the end of each period. Income statement accounts are translated at an exchange rate that approximates the average for the period. Translation adjustments arising from the use of differing exchange rates from period to period are included as a component of accumulated other comprehensive income (loss) within stockholders’ equity. Gains and losses from foreign currency transactions are included in net income for the period. The Company may re-evaluate the functional currencies of certain operations outside the U.S. if there are significant changes to operations that indicate that a change in functional currency may be necessary.
Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block]	Defined Benefit Pension Plans Liabilities and expenses for defined benefit pension plans are determined using actuarial methodologies and incorporate significant assumptions, including the interest rate used to discount the future estimated cash flows, the expected long-term rate of return on plan assets, and several assumptions relating to the employee workforce (salary increases, retirement age, and mortality). Unrealized gains and losses related to the Company’s defined benefit pension obligations are recognized as a component of accumulated other comprehensive income (loss) within stockholders’ equity. Gains or losses resulting from plan amendments, curtailments, and settlements are recognized as a component of other non-operating income and expenses (“other expense (income), net”) in the period of the remeasurement.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company measures the fair value of assets and liabilities on a recurring and nonrecurring basis according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of the fair value hierarchy are as follows: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible at the measurement date; Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, and Level 3 inputs are unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to measurements involving significant unobservable inputs (Level 3). The Company measures the fair values of goodwill, intangible assets and property, buildings and equipment on a nonrecurring basis if required by impairment tests applicable to these assets, as described above.
Other Income and Expense	Other (Income) Expense, net Other non-operating income and expenses (“other (income) expense, net”) primarily includes the non-service cost components of net periodic pension cost (benefit), foreign exchange gains and losses, and periodic, non-operating transactions. For the year ended December 31, 2024, these periodic, non-operating transactions included the divestiture of the Wesco Integrated Supply (“WIS”) business, which resulted in a gain from the sale of $122.2 million, described further in Note 5, “Acquisitions and Divestitures”.
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recently Adopted and Recently Issued Accounting Standards
New Accounting Pronouncements, Policy	Recently Adopted and Recently Issued Accounting Standards In September 2022, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2022-04, Supplier Finance Programs (Subtopic 405-50): Disclosure of Supplier Finance Program Obligations , which requires that a buyer in a supplier finance program disclose sufficient information about the program to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude. The amendments in this ASU are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, except for the amendment on rollforward information, which is effective for fiscal years beginning after December 15, 2023. The Company adopted this ASU in the first quarter of 2023, except for the amendment on rollforward information, which the Company adopted in the fourth quarter of 2024. The adoption of this ASU resulted in additional disclosure of the Company’s supplier finance programs. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which enhances prior reportable segment disclosure requirements in part by requiring entities to disclose significant expenses related to their reportable segments. The amendments in this ASU are effective on a retrospective basis for annual periods beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. The Company adopted this ASU in the fourth quarter of 2024. The adoption of this ASU resulted in additional required disclosures, including the disclosure of certain expenses at the reportable segment level, described further in Note 16, “Business Segments”. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as information on income taxes paid to enhance the transparency and decision usefulness of income tax disclosures. The amendments in this ASU are effective for annual periods beginning after December 15, 2024 on a prospective basis. Management is currently evaluating the impact that this accounting standard will have on its consolidated financial statements and notes thereto. In March 2024, the SEC issued final climate-related disclosure rules requiring disclosure of material climate-related risks, board and management governance of such risks, and material direct and indirect greenhouse gas emissions. The rules also require disclosure in the notes to the financial statements of the effects of severe weather events and other natural conditions. Disclosures will be made prospectively, with phased-in effective dates starting with fiscal years beginning on or after January 1, 2025. In April 2024, the SEC voluntarily stayed implementation of the climate-related disclosure rules, pending completion of judicial review of consolidated challenges to the rules by the Court of Appeals for the Eighth Circuit. Management is currently evaluating the impact that these rules could have on its consolidated financial statements and notes thereto. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses , which is intended to enhance expense disclosures, primarily by requiring disclosure of disaggregated information about certain income statement expense line items on an annual and interim basis. The amendments in this ASU are effective for fiscal years beginning after December 15, 2026 and interim periods within fiscal years beginning after December 15, 2027. The amendments in this ASU should be applied prospectively; however, retrospective application is permitted. Management is currently evaluating the impact that this accounting standard will have 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.
Hosting Arrangement, Policy	Cloud Computing Arrangements The Company capitalizes costs associated with implementing its various cloud computing arrangements, which are amortized using the straight-line method over the estimated useful life, typically three to seven years. Capitalized implementation costs, which are recorded as a component of other assets in the Consolidated Balance Sheets, were $257.8 million and $195.4 million as of December 31, 2024 and 2023, respectively, and the related accumulated amortization was $29.6 million and $15.5 million, respectively. Amortization expense related to cloud computing arrangements totaled $14.1 million, $9.2 million and $4.0 million for the years ended December 31, 2024, 2023 and 2022, respectively. During the second quarter of 2024, management determined that a third-party developed operations management software product would be abandoned in favor of an application that better suits the Company’s operations and the Company recognized a $17.8 million loss on abandonment of assets, which is recorded as a component of selling, general and administrative expenses in the Consolidated Statement of Income and Comprehensive Income for the year ended December 31, 2024.

Accounting Policies (Tables)

Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Supplier Finance Program	The following table sets forth the rollforward of outstanding obligations confirmed as valid under the Company’s supplier finance programs for the year ended December 31, 2024: (In millions) 2024 Confirmed obligations outstanding at the beginning of the year $ 32.6 Invoices confirmed during the year 106.0 Confirmed invoices paid during the year (126.2) Confirmed obligations outstanding at the end of the year $ 12.4

REVENUE (Tables)

REVENUE (Tables)	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	The following tables disaggregate Wesco’s net sales by segment and geography for the periods presented: Year Ended December 31, (In millions) 2024 2023 2022 Electrical & Electronic Solutions $ 8,546.8 $ 8,610.3 $ 8,823.3 Communications & Security Solutions 7,537.0 7,152.2 6,401.5 Utility & Broadband Solutions 5,735.0 6,622.7 6,195.3 Total by segment $ 21,818.8 $ 22,385.2 $ 21,420.1 Year Ended December 31, (In millions) 2024 2023 2022 United States $ 16,189.8 $ 16,609.1 $ 15,857.3 Canada 2,940.1 2,968.2 3,021.4 Other International (1) 2,688.9 2,807.9 2,541.4 Total by geography (2) $ 21,818.8 $ 22,385.2 $ 21,420.1 (1) No individual country’s net sales are greater than 10% of total net sales. (2) Wesco attributes revenues from external customers to individual countries on the basis of point of sale.

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table sets forth the changes in the carrying value of goodwill by reportable segment for the periods presented: EES CSS UBS Total (In millions) Balance as of December 31, 2022 $ 825.5 $ 1,208.9 $ 1,206.5 $ 3,240.9 Adjustments to goodwill for acquisitions — 0.9 — 0.9 Foreign currency exchange rate changes 12.6 1.8 6.1 20.5 Balance as of December 31, 2023 $ 838.1 $ 1,211.6 $ 1,212.6 $ 3,262.3 Adjustments to goodwill for acquisitions 4.7 147.2 — 151.9 Adjustment to goodwill for divestiture — — (58.1) (58.1) Foreign currency exchange rate changes (43.5) (11.8) (20.7) (76.0) Balance as of December 31, 2024 $ 799.3 $ 1,347.0 $ 1,133.8 $ 3,280.1
Schedule of Intangible Assets by Major Class	The components of intangible assets are as follows: December 31, 2024 December 31, 2023 Life (in years) Gross Carrying Amount (1) Accumulated Amortization (1) Net Gross Carrying Amount (1) Accumulated Amortization (1) Net (In millions) Intangible assets: Trademarks Indefinite $ 789.7 $ — $ 789.7 $ 793.0 $ — $ 793.0 Customer relationships 10 - 20 1,502.4 (476.4) 1,026.0 1,519.9 (464.4) 1,055.5 Distribution agreements 15 and 19 29.2 (27.7) 1.5 29.2 (26.0) 3.2 Trademarks 5 and 12 15.5 (11.7) 3.8 15.5 (9.6) 5.9 Software 7 16.0 (1.1) 14.9 — — — $ 2,352.8 $ (516.9) $ 1,835.9 $ 2,357.6 $ (500.0) $ 1,857.6 (1) Excludes the original cost and related accumulated amortization of fully-amortized intangible assets.
Schedule of Expected Amortization Expense	The following table sets forth the remaining estimated amortization expense for intangible assets for the next five years and thereafter: For the year ending December 31, (In millions) 2025 $ 88.7 2026 83.5 2027 80.6 2028 79.0 2029 77.9 Thereafter 636.5 Total $ 1,046.2

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	12 Months Ended
	Dec. 31, 2024
Business Acquisition [Line Items]
Business Acquisition, Schedule of Consideration Transferred	The total preliminary estimated fair value of consideration transferred for the acquisition of Ascent consisted of the following: (In millions) Purchase price $ 185.0 Adjustments to purchase price (3.3) Total cash consideration 181.7 Seller expenses paid by Wesco 5.1 Total purchase consideration $ 186.8 Supplemental cash flow disclosure related to acquisitions: Cash paid for acquisition $ 186.8 Less: Cash acquired (7.2) Cash paid for acquisition, net of cash acquired $ 179.6
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table sets forth the preliminary allocation of the purchase consideration to the respective fair values of assets acquired and liabilities assumed for the acquisition of Ascent: Assets (In millions) Cash and cash equivalents $ 7.2 Trade accounts receivable 51.8 Intangible asset (1) 58.0 Goodwill 118.2 Other current and noncurrent assets 26.5 Total assets $ 261.7 Liabilities Accounts payable $ 20.9 Accrued payroll and benefit costs 7.8 Other current and noncurrent liabilities 46.2 Total liabilities $ 74.9 Fair value of net assets acquired, including goodwill and intangible asset $ 186.8 (1) Consists of a customer relationship intangible asset with an estimated useful life of 15 years.

PROPERTY, BUILDINGS AND EQUIP_2

PROPERTY, BUILDINGS AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	The following table sets forth the components of property, buildings and equipment: As of December 31, 2024 2023 (In millions) Buildings and leasehold improvements $ 246.9 $ 202.6 Furniture, fixtures and equipment 404.4 359.9 Software costs 316.5 292.6 967.8 855.1 Accumulated depreciation and amortization (554.1) (502.5) 413.7 352.6 Land 25.3 25.0 Construction in progress 3.9 46.0 Property, buildings and equipment, net $ 442.9 $ 423.6

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Lease, Cost [Table Text Block]	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: Year Ended December 31, (In millions) 2024 2023 2022 Operating lease cost $ 223.6 $ 197.0 $ 175.8 Short-term lease cost 6.9 8.9 4.8 Variable lease cost 60.3 53.2 45.7 Total lease cost $ 290.8 $ 259.1 $ 226.4
Schedule of Cash Flow, Supplemental Disclosures	The following table sets forth supplemental cash flow information related to operating leases for the periods presented: Year Ended December 31, (In millions) 2024 2023 2022 Operating cash flows from operating leases $ 212.7 $ 174.5 $ 171.7 Right-of-use assets obtained in exchange for new operating lease liabilities 205.5 296.9 267.1
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	The following table sets forth the maturities of the Company’s operating lease liabilities and reconciles the respective undiscounted payments to the total operating lease liabilities in the Consolidated Balance Sheet as of December 31, 2024: (In millions) 2025 $ 205.2 2026 178.5 2027 149.9 2028 116.0 2029 83.9 Thereafter 161.7 Total undiscounted operating lease payments 895.2 Less: imputed interest (110.9) Total operating lease liabilities $ 784.3
AssetsAndLiabilitiesLesseeTableTextBlock	The following table sets forth supplemental balance sheet information related to operating leases for the periods presented: As of December 31, (In millions) 2024 2023 Operating lease assets $ 735.1 $ 761.2 Current operating lease liabilities (1) 169.5 156.7 Noncurrent operating lease liabilities 614.8 641.7 Total operating lease liabilities $ 784.3 $ 798.4 (1) Current operating lease liabilities are recorded as a component of other current liabilities in the Consolidated Balance Sheets.

DEBT (Tables)

DEBT (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Debt	The following table sets forth Wesco’s outstanding indebtedness: As of December 31, 2024 2023 (In millions) International lines of credit $ 0.6 $ 1.0 Accounts Receivable Securitization Facility 1,450.0 1,550.0 Revolving Credit Facility 525.0 953.0 6.00% Anixter Senior Notes due 2025 4.2 4.2 7.125% Senior Notes due 2025 — 1,500.0 7.250% Senior Notes due 2028, less debt discount of $4.4 and $5.6 in 2024 and 2023, respectively 1,320.6 1,319.4 6.375% Senior Notes due 2029 900.0 — 6.625% Senior Notes due 2032 850.0 — Finance lease obligations 57.3 31.4 Total debt 5,107.7 5,359.0 Plus: Fair value adjustments to the Anixter Senior Notes 0.1 0.1 Less: Unamortized debt issuance costs (42.8) (37.4) Less: Short-term debt and current portion of long-term debt (19.5) (8.6) Total long-term debt $ 5,045.5 $ 5,313.1
Schedule of Maturities of Long-term Debt	The following table sets forth the aggregate principal repayment requirements for all indebtedness for the next five years and thereafter, as of December 31, 2024: (In millions) 2025 $ 19.5 2026 14.2 2027 1,987.2 2028 1,333.5 2029 904.6 Thereafter 853.1 Total payments on debt 5,112.1 Debt discount (4.4) Total debt $ 5,107.7

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	The following table sets forth the components of income before income taxes by jurisdiction: Year Ended December 31, 2024 2023 2022 (In millions) United States $ 713.7 $ 739.4 $ 859.4 Foreign 237.3 252.6 277.3 Income before income taxes $ 951.0 $ 992.0 $ 1,136.7
Schedule of Components of Income Tax Expense	The following table sets forth the components of the provision for income taxes: Year Ended December 31, 2024 2023 2022 (In millions) Current income taxes: Federal $ 150.2 $ 124.8 $ 166.1 State 41.5 34.6 43.0 Foreign 79.8 74.4 66.7 Total current income taxes 271.5 233.8 275.8 Deferred income taxes: Federal (22.8) (1.0) (7.5) State (5.0) 2.7 0.7 Foreign (12.1) (9.6) 5.6 Total deferred income taxes (39.9) (7.9) (1.2) Provision for income taxes $ 231.6 $ 225.9 $ 274.5
Schedule of Effective Income Tax Rate Reconciliation	The following table sets forth the reconciliation between the federal statutory income tax rate and the effective tax rate: Year Ended December 31, 2024 2023 2022 Federal statutory rate 21.0 % 21.0 % 21.0 % State income taxes, net of federal income tax benefit 2.9 3.0 3.1 Tax effect of intercompany financing (1.0) (0.9) (1.2) Change in valuation allowance 1.0 (0.9) (0.9) Tax effect of foreign income 1.0 1.1 1.6 Other (0.5) (0.5) 0.6 Effective tax rate 24.4 % 22.8 % 24.2 % The corporate alternative minimum tax (“CAMT”) was enacted as part of the Inflation Reduction Act of 2022. The CAMT imposes a minimum tax of 15% on the adjusted financial statement income (“AFSI”) of certain corporations with average annual AFSI over a three-year period in excess of $1 billion, so-called “applicable corporations”. CAMT is effective for tax years beginning after December 31, 2022. The Company was not subject to CAMT for the years ended December 31, 2024 and 2023, respectively, and does not expect to be subject to it for the year ended December 31, 2025.
Schedule of Deferred Tax Assets and Liabilities	The following table sets forth deferred tax assets and liabilities: As of December 31, 2024 2023 (In millions) Assets Liabilities Assets Liabilities Accounts receivable $ 22.4 $ — $ 23.3 $ — Inventories 50.7 — 45.9 — Depreciation of property, buildings and equipment — 20.9 — 41.0 Operating leases 210.1 200.3 201.8 192.0 Amortization of intangible assets — 545.9 — 564.5 Employee benefits 27.8 — 21.5 — Stock-based compensation 8.8 — 11.2 — Disallowed business interest expense 4.8 — 2.2 — Net operating loss carryforwards 35.6 — 36.7 — Foreign tax credit carryforwards 41.0 — 41.1 — Other 33.2 8.4 38.0 10.3 Deferred income taxes before valuation allowance 434.4 775.5 421.7 807.8 Valuation allowance (32.6) — (23.5) — Total deferred income taxes $ 401.8 $ 775.5 $ 398.2 $ 807.8
Summary of Income Tax Examinations	The Company is under examination by tax authorities in various jurisdictions and remains subject to examination until the applicable statutes of limitation expire. The statutes of limitation for the material jurisdictions in which the Company files income tax returns remain open as follows: United States — Federal 2021 and forward United States — Material States 2017 and forward Canada 2012 and forward UK 2019 and forward Australia 2018 and forward
Schedule of Unrecognized Tax Benefits Roll Forward	The following table sets forth the reconciliation of gross unrecognized tax benefits: As of December 31, 2024 2023 2022 (In millions) Beginning balance January 1 $ 121.3 $ 109.3 $ 107.3 Additions for current year tax positions 20.5 29.2 14.4 Additions for prior year tax positions 9.1 6.6 0.9 Additions for acquired tax positions — 0.9 5.5 Reductions for prior year tax positions (2.2) (6.7) (1.8) Settlements — (2.5) — Lapse in statute of limitations (13.0) (15.8) (14.5) Foreign currency exchange rate changes (4.5) 0.3 (2.6) Ending balance December 31 $ 131.2 $ 121.3 $ 109.3

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the details of basic and diluted earnings per share: Year Ended December 31, 2024 2023 2022 (In millions, except per share data) Net income attributable to WESCO International, Inc. $ 717.6 $ 765.5 $ 860.5 Less: Preferred stock dividends 57.4 57.4 57.4 Net income attributable to common stockholders $ 660.2 $ 708.1 $ 803.1 Weighted-average common shares outstanding used in computing basic earnings per share 49.8 51.1 50.7 Common shares issuable upon exercise of dilutive equity awards 0.8 1.2 1.7 Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share 50.6 52.3 52.4 Earnings per share attributable to common stockholders Basic $ 13.26 $ 13.86 $ 15.83 Diluted $ 13.05 $ 13.54 $ 15.33

EMPLOYEE BENEFIT PLANS - (Table

EMPLOYEE BENEFIT PLANS - (Tables)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Schedule of Net Funded Status [Table Text Block]	The following table presents the changes in benefit obligations, plan assets and funded status for the defined benefit plans: Domestic Plan Foreign Plans Total (In millions) 2024 2023 2024 2023 2024 2023 Change in Projected Benefit Obligation Beginning balance $ 147.5 $ 253.5 $ 309.1 $ 267.3 $ 456.6 $ 520.8 Service cost — — 1.9 4.7 1.9 4.7 Interest cost 1.1 10.4 13.1 12.9 14.2 23.3 Participant contributions — — 0.1 1.0 0.1 1.0 Actuarial (gain) loss, including assumption changes (4.0) 2.6 (20.1) 29.5 (24.1) 32.1 Benefits paid from plan assets (5.8) (8.1) (11.6) (11.7) (17.4) (19.8) Benefits paid from Company assets — — (0.4) (0.5) (0.4) (0.5) Curtailment — — (0.2) — (0.2) — Settlement (138.8) (110.9) (0.8) (4.2) (139.6) (115.1) Foreign currency exchange rate changes — — (17.0) 10.1 (17.0) 10.1 Ending balance $ — $ 147.5 $ 274.1 $ 309.1 $ 274.1 $ 456.6 Change in Plan Assets at Fair Value Beginning balance $ 178.1 $ 285.1 $ 295.7 $ 267.6 $ 473.8 $ 552.7 Actual return on plan assets (2.8) 12.0 9.6 24.1 6.8 36.1 Participant contributions — — 0.1 1.0 0.1 1.0 Employer contributions (reversion) (33.6) — 20.0 10.2 (13.6) 10.2 Benefits paid (5.8) (8.1) (12.0) (12.2) (17.8) (20.3) Settlement (138.8) (110.9) (0.8) (4.2) (139.6) (115.1) Foreign currency exchange rate changes and other 2.9 — (18.1) 9.2 (15.2) 9.2 Ending balance $ — $ 178.1 $ 294.5 $ 295.7 $ 294.5 $ 473.8 Funded Status $ — $ 30.6 $ 20.4 $ (13.4) $ 20.4 $ 17.2 Amounts Recognized in the Consolidated Balance Sheets Other assets $ — $ 30.6 $ 30.8 $ 18.0 $ 30.8 $ 48.6 Other current liabilities — — (0.4) (0.4) (0.4) (0.4) Other noncurrent liabilities — — (10.0) (31.0) (10.0) (31.0) Net amount recognized $ — $ 30.6 $ 20.4 $ (13.4) $ 20.4 $ 17.2 Weighted Average Assumptions Used to Determine Benefit Obligations Discount rate n/a 4.5 % 4.8 % 4.4 % 4.8 % 4.4 % Rate of compensation increase n/a n/a 3.2 % 3.3 % 3.2 % 3.3 %
Schedule of Net Benefit Costs [Table Text Block]	The following tables set forth the components of net periodic pension cost (benefit) for the Company’s defined benefit plans: Domestic Plan Foreign Plans Total (In millions) 2024 2023 2022 2024 2023 2022 2024 2023 2022 Components of Net Periodic Pension Cost (Benefit) Service cost $ — $ — $ — $ 1.9 $ 4.7 $ 8.3 $ 1.9 $ 4.7 $ 8.3 Interest cost 1.1 10.4 8.7 13.1 12.9 9.5 14.2 23.3 18.2 Expected return on plan assets (0.3) (9.6) (14.4) (13.7) (14.0) (17.6) (14.0) (23.6) (32.0) Recognized actuarial loss — — — (0.5) (2.3) (0.9) (0.5) (2.3) (0.9) Curtailment — — — (0.2) — — (0.2) — — Settlement 2.5 4.7 — (0.4) (1.9) (0.1) 2.1 2.8 (0.1) Net periodic pension cost (benefit) $ 3.3 $ 5.5 $ (5.7) $ 0.2 $ (0.6) $ (0.8) $ 3.5 $ 4.9 $ (6.5)
Defined Benefit Plan, Assumptions [Table Text Block]	The following weighted-average actuarial assumptions were used to determine net periodic pension cost (benefit): Domestic Plan Foreign Plans Total 2024 2023 2022 2024 2023 2022 2024 2023 2022 Discount rate 4.5 % 4.4 % 2.9 % 4.4 % 4.8 % 2.4 % 4.4 % 4.6 % 2.6 % Expected return on plan assets 4.5 % 4.8 % 4.3 % 5.1 % 5.5 % 5.0 % 4.8 % 5.1 % 4.6 % Rate of compensation increase n/a n/a n/a 3.3 % 3.4 % 3.4 % 3.3 % 3.4 % 3.4 %
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)	The following table sets forth the changes and the end of year components of accumulated other comprehensive (income) loss for the defined benefit plans: Year Ended December 31, (In millions) 2024 2023 Changes to Balance: Beginning balance, before tax effect $ (22.5) $ (40.6) Prior service credit recognized in current year due to curtailment 0.1 — Net actuarial (gain) loss arising in current year (17.0) 19.6 Recognized actuarial loss 0.5 2.3 Curtailment 0.2 — Settlement (2.1) (2.8) Foreign currency exchange rate changes and other (0.7) (1.0) Ending balance, before tax effect $ (41.5) $ (22.5) As of December 31, (In millions) 2024 2023 Components of Balance: Prior service credit $ (0.1) $ (0.2) Net actuarial gain (41.4) (22.3) Ending balance, before tax effect (41.5) (22.5) Tax effect 8.5 2.8 Ending balance, after tax effect $ (33.0) $ (19.7)
Schedule of Expected Benefit Payments [Table Text Block]	The following benefit payments, which reflect expected future service, are expected to be paid as follows for the Foreign Plans: For the year ending December 31, (In millions) 2025 $ 10.3 2026 10.8 2027 11.1 2028 14.6 2029 15.1 2030 to 2034 89.0
Defined Benefit Plan, Plan Assets, Allocation [Table Text Block]	The asset mixes and the asset allocation guidelines for the Domestic Plan and Foreign Plans are summarized as follows: Foreign Plans Allocation Guidelines December 31, 2024 Min Target Max Equities 17.6 % — % 19 % 44 % Debt securities: Domestic treasuries 0.7 — 1 — Corporate bonds 3.3 1 3 25 Pooled investment funds and other 66.8 37 66 92 Total debt securities 70.8 70 Property/real estate 3.7 — 3 9 Insurance products 7.3 7 7 7 Other 0.6 — 1 8 100.0 % 100 % Domestic Plan Allocation Guidelines December 31, 2023 Min Target Max Equities 4.0 % — % 4 % 35 % Debt securities: Domestic treasuries 17.3 — 17 — Corporate bonds 40.5 — 41 — Total debt securities 57.8 58 Cash equivalents 38.2 — 38 — 100.0 % 100 % Foreign Plans Allocation Guidelines December 31, 2023 Min Target Max Equities 19.7 % 12 % 21 % 29 % Debt securities: Domestic treasuries 0.8 — 1 — Corporate bonds 3.2 1 1 31 Pooled investment funds and other 63.7 48 67 78 Total debt securities 67.7 69 Property/real estate 4.0 2 2 8 Insurance products 7.1 7 7 7 Other 1.5 — 1 8 100.0 % 100 %
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	The following tables set forth the fair value of assets by asset category for the Domestic Plan and Foreign Plans: December 31, 2024 (In millions) Level 1 Level 2 Level 3 NAV (1) Total Foreign Plans Equities $ — $ — $ — $ 51.8 $ 51.8 Debt securities: Domestic treasuries — — — 2.0 2.0 Corporate bonds — — — 9.8 9.8 Pooled investment funds and other — — — 196.8 196.8 Property/real estate — — — 10.9 10.9 Insurance products — 21.4 — — 21.4 Other 1.8 — — — 1.8 Total investments in Foreign Plans $ 1.8 $ 21.4 $ — $ 271.3 $ 294.5 (1) Investments measured at fair value using the net asset value ( “ NAV ”) per share practical expedient have not been classified in the fair value hierarchy. The amounts presented in the tables above are intended to reconcile the fair value hierarchy to the total fair value of plan assets. December 31, 2023 (In millions) Level 1 Level 2 Level 3 NAV (1) Total Domestic Plan Equities $ — $ — $ — $ 7.2 $ 7.2 Debt securities: Domestic treasuries — — — 30.9 30.9 Corporate bonds — — — 72.0 72.0 Cash equivalents 68.0 — — — 68.0 Total investments in Domestic Plan $ 68.0 $ — $ — $ 110.1 $ 178.1 Foreign Plans Equities $ — $ — $ — $ 58.3 $ 58.3 Debt securities: Domestic treasuries — — — 2.4 2.4 Corporate bonds — — — 9.6 9.6 Pooled investment funds and other — — — 188.2 188.2 Property/real estate — — — 11.8 11.8 Insurance products — 20.9 — — 20.9 Other 4.5 — — — 4.5 Total investments in Foreign Plans $ 4.5 $ 20.9 $ — $ 270.3 $ 295.7 Total Equities $ — $ — $ — $ 65.5 $ 65.5 Debt securities: Domestic treasuries — — — 33.3 33.3 Corporate bonds — — — 81.7 81.6 Pooled investment funds and other — — — 188.2 188.2 Property/real estate — — — 11.8 11.8 Insurance products — 20.9 — — 20.9 Cash equivalents 68.0 — — — 68.0 Other 4.5 — — — 4.5 Total investments $ 72.5 $ 20.9 $ — $ 380.4 $ 473.8 (1) Investments measured at fair value using the NAV per share practical expedient have not been classified in the fair value hierarchy. The amounts presented in the tables above are intended to reconcile the fair value hierarchy to the total fair value of plan assets.

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The fair values of stock options, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods: Year Ended December 31, 2024 2023 2022 Risk free interest rate 4.2% 4.1% 2.0% Expected life (in years) 5 5 7 Expected volatility 55% 50% 43% Expected dividend yield 1.09% 0.89% n/a
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	The following table sets forth a summary of restricted stock units and related information for the periods presented: Year Ended December 31, 2024 2023 2022 Awards Weighted-Average Awards Weighted-Average Awards Weighted-Average Unvested at beginning of year 407,613 $ 127.49 774,233 $ 73.79 974,162 $ 53.48 Granted 249,757 158.78 177,659 169.65 234,800 122.13 Vested (195,578) 115.66 (508,173) 59.72 (393,194) 53.13 Forfeited (34,222) 141.98 (36,106) 137.28 (41,535) 66.30 Unvested at end of year 427,570 $ 149.84 407,613 $ 127.49 774,233 $ 73.79 The following table sets forth a summary of performance-based awards and related information for the periods presented: Year Ended December 31, 2024 2023 2022 Awards Weighted-Average Awards Weighted-Average Awards Weighted-Average Unvested at beginning of year 254,859 $ 115.15 335,329 $ 75.26 380,819 $ 59.23 Granted (1) 194,599 109.04 212,656 87.04 83,991 122.09 Vested (223,042) 77.08 (289,394) 48.32 (115,394) 54.64 Forfeited (11,899) 151.11 (3,732) 111.00 (14,087) 60.75 Unvested at end of year 214,517 $ 147.19 254,859 $ 115.15 335,329 $ 75.26 (1)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	During the years ended December 31, 2024, 2023 and 2022, Wesco granted the following stock options, restricted stock units, and performance-based awards at the following weighted-average fair values: Year Ended December 31, 2024 2023 2022 Stock options granted 85,425 78,729 92,799 Weighted-average fair value $ 72.05 $ 76.69 $ 57.15 Restricted stock units granted 249,757 177,659 234,800 Weighted-average fair value $ 158.78 $ 169.65 $ 122.13 Performance-based awards granted (1) 194,599 212,656 83,991 Weighted-average fair value (1) $ 109.04 $ 87.04 $ 122.09
Share-Based Payment Arrangement, Stock Appreciation Right, Activity	The following table sets forth a summary of stock-settled stock appreciation rights and related information for the periods presented: Year Ended December 31, 2024 2023 2022 Awards Weighted-Average Weighted-Average Aggregate Awards Weighted-Average Awards Weighted-Average Beginning of year 818,284 $ 59.55 1,248,115 $ 62.02 1,370,388 $ 62.09 Granted — — — — — — Exercised (118,513) 63.29 (428,500) 66.70 (113,382) 61.90 Forfeited (727) 76.25 (1,331) 74.57 (8,891) 73.35 End of year 699,044 58.90 4.1 $ 85.3 818,284 59.55 1,248,115 62.02 Exercisable at end of year 699,044 $ 58.90 4.1 $ 85.3 777,479 $ 58.64 1,083,320 $ 61.91 For the year ended December 31, 2024, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $15.2 million.
Share-Based Payment Arrangement, Option, Activity	The following table sets forth a summary of stock options and related information for the periods presented: Year Ended December 31, 2024 2023 2022 Awards Weighted-Average Weighted-Average Remaining Contractual Life (In years) Aggregate Awards Weighted-Average Awards Weighted- Average Exercise Price Beginning of year 163,082 $ 144.51 87,347 $ 121.55 — $ — Granted 85,425 152.07 78,729 169.72 92,799 121.58 Exercised (3,495) 128.40 (1,279) 122.09 — — Forfeited (10,198) 154.32 (1,715) 148.67 (5,452) 122.09 End of year 234,814 147.08 8.1 $ 8.0 163,082 144.51 87,347 121.55 Exercisable at end of year 78,399 $ 136.60 7.5 $ 3.5 28,411 $ 121.53 879 $ 122.09

BUSINESS SEGMENTS (Tables)

BUSINESS SEGMENTS (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables present information about the Company’s reportable segments and reconcile adjusted EBITDA by segment, which is the Company’s measure of segment profit or loss, to income before income taxes on a consolidated basis for the periods presented: Year Ended December 31, 2024 (In millions) EES CSS UBS Reportable Segments Total Net sales $ 8,546.8 $ 7,537.0 $ 5,735.0 $ 21,818.8 Less: Cost of goods sold (excluding depreciation and amortization) 6,517.8 5,918.4 4,670.0 17,106.2 Selling, general and administrative payroll expenses (1)(3) 854.6 614.1 244.9 1,713.6 Other segment items (2) 456.9 383.4 176.7 1,017.0 Adjusted EBITDA $ 717.5 $ 621.1 $ 643.4 $ 1,982.0 Adjusted EBITDA margin % 8.4 % 8.2 % 11.2 % Reconciliation of adjusted EBITDA Depreciation and amortization 146.8 Other income, net (50.9) Stock-based compensation expense (3) 14.1 Unallocated amounts (Corporate): Depreciation and amortization 36.4 Selling, general and administrative expenses 561.5 Interest expense, net (4) 364.9 Other income, net (41.8) Income before income taxes $ 951.0 (1) Selling, general and administrative payroll expenses includes salaries, benefits, commissions, incentives, temporary labor, and other payroll expenses. (2) Other segment items primarily includes allocated expenses (which includes employee-related allocations), transportation costs, facility costs (including rent and utilities), employee expenses (including travel and entertainment), credit losses, professional and consulting fees, supplies, real estate and personal property taxes, sales promotion expenses, and gains (losses) on the sale, disposal, or abandonment of property and equipment. (3) Stock-based compensation expense is excluded from selling, general and administrative payroll expenses, as this is an adjustment to calculate adjusted EBITDA. (4) The reportable segments do not incur interest expense as these costs are centrally controlled through the Corporate treasury function. Year Ended December 31, 2023 (In millions) EES CSS UBS Reportable Segments Total Net sales $ 8,610.3 $ 7,152.2 $ 6,622.7 $ 22,385.2 Less: Cost of goods sold (excluding depreciation and amortization) 6,576.2 5,524.6 5,440.7 17,541.5 Selling, general and administrative payroll expenses (1)(3) 872.2 594.0 275.5 1,741.7 Other segment items (2) 434.5 349.8 167.2 951.5 Adjusted EBITDA $ 727.4 $ 683.8 $ 739.3 $ 2,150.5 Adjusted EBITDA margin % 8.4 % 9.6 % 11.2 % Reconciliation of adjusted EBITDA Depreciation and amortization 140.0 Other expense, net 82.9 Stock-based compensation expense (3) 14.2 Unallocated amounts (Corporate): Depreciation and amortization 41.3 Selling, general and administrative expenses 548.6 Interest expense, net (4) 389.3 Other income, net (57.8) Income before income taxes $ 992.0 (1) Selling, general and administrative payroll expenses includes salaries, benefits, commissions, incentives, temporary labor, and other payroll expenses. (2) Other segment items primarily includes allocated expenses (which includes employee-related allocations), transportation costs, facility costs (including rent and utilities), employee expenses (including travel and entertainment), credit losses, professional and consulting fees, supplies, real estate and personal property taxes, sales promotion expenses, and gains (losses) on the sale, disposal, or abandonment of property and equipment. (3) Stock-based compensation expense is excluded from selling, general and administrative payroll expenses, as this is an adjustment to calculate adjusted EBITDA. (4) The reportable segments do not incur interest expense as these costs are centrally controlled through the Corporate treasury function. Year Ended December 31, 2022 (In millions) EES CSS UBS Reportable Segments Total Net sales $ 8,823.3 $ 6,401.5 $ 6,195.3 $ 21,420.1 Less: Cost of goods sold (excluding depreciation and amortization) 6,708.0 4,944.5 5,106.3 16,758.8 Selling, general and administrative payroll expenses (1)(3) 822.1 516.7 264.0 1,602.8 Other segment items (2) 441.9 341.3 147.7 930.9 Adjusted EBITDA $ 851.3 $ 599.0 $ 677.3 $ 2,127.6 Adjusted EBITDA margin % 9.6 % 9.4 % 10.9 % Reconciliation of adjusted EBITDA Depreciation and amortization 134.3 Other income, net (1.3) Stock-based compensation expense (3) 17.6 Unallocated amounts (Corporate): Depreciation and amortization 44.7 Selling, general and administrative expenses 492.9 Interest expense, net (4) 294.4 Other expense, net 8.3 Income before income taxes $ 1,136.7 (1) Selling, general and administrative payroll expenses includes salaries, benefits, commissions, incentives, temporary labor, and other payroll expenses. (2) Other segment items primarily includes allocated expenses (which includes employee-related allocations), transportation costs, facility costs (including rent and utilities), employee expenses (including travel and entertainment), credit losses, professional and consulting fees, supplies, real estate and personal property taxes, sales promotion expenses, and gains (losses) on the sale, disposal, or abandonment of property and equipment. (3) Stock-based compensation expense is excluded from selling, general and administrative payroll expenses, as this is an adjustment to calculate adjusted EBITDA. (4) The reportable segments do not incur interest expense as these costs are centrally controlled through the Corporate treasury function.

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Allowance for Doubtful Accounts	Balance at Charged to Balance at of period earnings Deductions (1) end of period Allowance for expected credit losses (In millions) Year Ended December 31, 2024 $ 55.9 $ 18.7 $ (19.6) $ 55.0 Year Ended December 31, 2023 46.5 18.6 (9.2) 55.9 Year Ended December 31, 2022 41.7 18.0 (13.2) 46.5 (1) Includes a reduction in the allowance for expected credit losses due to the write-off of trade accounts receivable. Balance at Charged to Balance at of period earnings Deductions (1) end of period Allowance for deferred tax assets (In millions) Year Ended December 31, 2024 $ 23.5 $ 10.3 $ (1.2) $ 32.6 Year Ended December 31, 2023 33.7 7.7 (17.9) 23.5 Year Ended December 31, 2022 46.3 5.8 (18.4) 33.7 (1) For the years ended December 31, 2024 and December 31, 2023, deductions primarily relate to a decrease in the valuation allowance recorded against deferred tax assets related to certain foreign jurisdictions. For the year ended December 31, 2022, deductions primarily relate to a decrease in the valuation allowance recorded against deferred tax assets related to foreign tax credit carryforwards.

Accounting Policies (Details)

Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Sites	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Nontrade Receivables	$ 210	$ 233.1
Accounts Receivable, Allowance for Credit Loss, Current	55	55.9
Accounts Receivable, Credit Loss Expense (Reversal)	18.7	18.6	$ 18
Inventory Valuation Reserves	131.3	113.4
Inventory Write-down	66	63.1	$ 43.2
Intangible Assets, Net (Including Goodwill)	4,100
Self Insurance Reserve	$ 33.4	$ 28.1
Supplier volume rebate income percentage	1.30%	1.40%	1.60%
Number of Locations | Sites	700
Property, buildings and equipment, net	$ 442.9	$ 423.6
Finite-Lived Intangible Assets, Amortization Expense	86.1	88.6	$ 92.9
Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization	257.8	195.4
Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, Accumulated Amortization	$ 29.6	$ 15.5
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration]	Accounts payable	Accounts payable
Assets Disposed of by Method Other than Sale, in Period of Disposition, Gain (Loss) on Disposition	$ 17.8
Gain (Loss) on Disposition of Business	122.2	$ 0	0
Restricted Cash	19.7	$ 21.9
Supplier Finance Program [Line Items]
Supplier Finance Program, Obligation, Addition	106
Supplier Finance Program, Obligation, Settlement	$ (126.2)
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration]	Accounts payable	Accounts payable
Hosting Arrangement, Service Contract, Implementation Cost, Expense, Amortization	$ 14.1	$ 9.2	$ 4
Land, Buildings and Improvements
Property, buildings and equipment, net	$ 183.1
Minimum
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Hosting Arrangement, Service Contract, Useful Life	three
Supplier Finance Program [Line Items]
Hosting Arrangement, Service Contract, Useful Life	three
Minimum | Furniture and Fixtures [Member]
Property, Plant, and Equipment, Additional Disclosures	three
Minimum | Software and Software Development Costs [Member]
Property, Plant, and Equipment, Additional Disclosures	three
Minimum | Building
Property, Plant, and Equipment, Additional Disclosures	five
Maximum
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Hosting Arrangement, Service Contract, Useful Life	seven
Supplier Finance Program [Line Items]
Hosting Arrangement, Service Contract, Useful Life	seven
Maximum | Furniture and Fixtures [Member]
Property, Plant, and Equipment, Additional Disclosures	eight
Maximum | Software and Software Development Costs [Member]
Property, Plant, and Equipment, Additional Disclosures	seven
Maximum | Building
Property, Plant, and Equipment, Additional Disclosures	forty

REVENUE (Details)

REVENUE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 21,818.8	$ 22,385.2	$ 21,420.1
Selling, general and administrative expense	3,306.2	3,256	3,044.2
Deferred Revenue, Revenue Recognized	76.9	74
Deferred Revenue	141.8	111.9
EES
Disaggregation of Revenue [Line Items]
Net sales	8,546.8	8,610.3	8,823.3
CSS
Disaggregation of Revenue [Line Items]
Net sales	7,537	7,152.2	6,401.5
UBS
Disaggregation of Revenue [Line Items]
Net sales	5,735	6,622.7	6,195.3
UNITED STATES
Disaggregation of Revenue [Line Items]
Net sales	16,189.8	16,609.1	15,857.3
Canada
Disaggregation of Revenue [Line Items]
Net sales	2,940.1	2,968.2	3,021.4
Other International
Disaggregation of Revenue [Line Items]
Net sales	2,688.9	2,807.9	2,541.4
Shipping and Handling [Member]
Disaggregation of Revenue [Line Items]
Selling, general and administrative expense	$ 303.3	$ 306.8	$ 302.3

REVENUE Variable Consideration

REVENUE Variable Consideration (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Contract with Customer, Refund Liability	$ 41	$ 41.3
Revenue, Variable Consideration Constraint Increase (Decrease)	$ 436.2	$ 427.8	$ 417.1

FAIR VALUE OF FINANCIAL INSTR_2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative, Notional Amount	$ 345.7	$ 168.4
Senior Notes [Member]
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Long-term debt	3,074.9	2,823.7
Long-term Debt, Fair Value	$ 3,127.3	$ 2,880.3

GOODWILL AND INTANGIBLE ASSET_2

GOODWILL AND INTANGIBLE ASSETS - TEXTUALS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense	$ 86.1	$ 88.6	$ 92.9

GOODWILL AND INTANGIBLE ASSET_3

GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance January 1	$ 3,262.3	$ 3,240.9
Ending balance December 31	3,280.1	3,262.3
Goodwill, Acquired During Period	151.9	0.9
Goodwill, Transfers	(58.1)
Goodwill, Foreign Currency Translation Gain (Loss)	(76)	20.5
EES
Goodwill [Roll Forward]
Beginning balance January 1	838.1	825.5
Ending balance December 31	799.3	838.1
Goodwill, Acquired During Period	4.7	0
Goodwill, Transfers	0
Goodwill, Foreign Currency Translation Gain (Loss)	(43.5)	12.6
UBS
Goodwill [Roll Forward]
Beginning balance January 1	1,212.6	1,206.5
Ending balance December 31	1,133.8	1,212.6
Goodwill, Acquired During Period	0	0
Goodwill, Transfers	(58.1)
Goodwill, Foreign Currency Translation Gain (Loss)	(20.7)	6.1
CSS
Goodwill [Roll Forward]
Beginning balance January 1	1,211.6	1,208.9
Ending balance December 31	1,347	1,211.6
Goodwill, Acquired During Period	147.2	0.9
Goodwill, Transfers	0
Goodwill, Foreign Currency Translation Gain (Loss)	$ (11.8)	$ 1.8

GOODWILL AND INTANGIBLE ASSET_4

GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF INTANGIBLE ASSETS BY MAJOR CLASS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ (516.9)	$ (500)
Intangible Assets Gross Excluding Goodwill	2,352.8	2,357.6
Intangible Assets, Net (Excluding Goodwill)	1,835.9	1,857.6
Finite-Lived Intangible Assets, Amortization Expense	86.1	88.6	$ 92.9
Trademarks
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	15.5	15.5
Finite-Lived Intangible Assets, Accumulated Amortization	(11.7)	(9.6)
Finite-Lived Intangible Assets, Net	3.8	5.9
Customer relationships
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,502.4	1,519.9
Finite-Lived Intangible Assets, Accumulated Amortization	(476.4)	(464.4)
Finite-Lived Intangible Assets, Net	1,026	1,055.5
Distribution agreements
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	29.2	29.2
Finite-Lived Intangible Assets, Accumulated Amortization	(27.7)	(26)
Finite-Lived Intangible Assets, Net	1.5	3.2
Computer Software, Intangible Asset
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	16	0
Finite-Lived Intangible Assets, Accumulated Amortization	(1.1)	0
Finite-Lived Intangible Assets, Net	$ 14.9	0
Finite-Lived Intangible Asset, Useful Life	7 years
Trademarks
Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Gross	$ 789.7	$ 793
Minimum
Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Minimum | Trademarks
Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Minimum | Customer relationships
Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Minimum | Distribution agreements
Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Maximum
Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Maximum | Trademarks
Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Maximum | Customer relationships
Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Maximum | Distribution agreements
Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	19 years

GOODWILL AND INTANGIBLE ASSET_5

GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF EXPECTED AMORTIZATION EXPENSE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2021	$ 88.7
2022	83.5
2023	80.6
2024	79
2025	77.9
Thereafter	636.5
Finite-Lived Intangible Assets, Amortization Expense	86.1	$ 88.6	$ 92.9
Finite-Lived Intangible Asset, Expected Amortization, Total	$ 1,046.2

ACQUISITIONS (Details)

ACQUISITIONS (Details) - USD ($) $ / shares in Units, $ in Millions					12 Months Ended
	Dec. 05, 2024	Jul. 01, 2024	Jun. 03, 2024	Apr. 01, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Preferred stock, par value					$ 0.01
Goodwill					$ 3,280.1	$ 3,262.3	$ 3,240.9
Disposal Date				Apr. 01, 2024
Base purchase price for divestiture of business.				$ 350
Proceeds from Divestiture of Businesses, Net of Cash Divested					$ 354.9	$ 0	$ 0
Ascent
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Dec. 05, 2024
Business Acquisition, Description of Acquired Entity					Headquartered in St. Louis, Missouri, Ascent is a provider of data center facility management services with over 300 employees in the U.S. and Canada.
Business Combination, Reason for Business Combination					Ascent’s expertise in engineering and design-build consultation services, in addition to daily site operations, extends the Company’s suite of capabilities and solutions that serve the entire lifecycle of the data center.
Payment to Acquire Business, Fair Value of Cash Consideration	$ 181.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	58
Business Combination, Consideration Transferred	186.8
Goodwill	$ 118.2
Ascent | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					15 years
Independent Electric Supply
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Jul. 01, 2024
Business Acquisition, Description of Acquired Entity					a full-line electrical distributor headquartered in Ontario, Canada.
Payment to Acquire Business, Fair Value of Cash Consideration		$ 11.6
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		2.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		5.9
Business Combination, Consideration Transferred		$ 13.2
entroCIM
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			Jun. 03, 2024
Business Acquisition, Description of Acquired Entity					entroCIM is an innovator in data center and building intelligence software.
Payment to Acquire Business, Fair Value of Cash Consideration			$ 30.1
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			8
Business Combination, Consideration Transferred			36.5
Business Combination, Contingent Consideration, Liability					$ 6.4
Goodwill			$ 29

SCHEDULE OF CONSIDERATION TRANS

SCHEDULE OF CONSIDERATION TRANSFERRED (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 05, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 221.3	$ 0	$ 186.8
Rahi Systems
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross				$ 255.4
Ascent
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 186.8
Payment to Acquire Business, Fair Value of Cash Consideration	181.7
Payment for Seller Expenses	5.1
Business Combination, Consideration Transferred	186.8
Cash Acquired from Acquisition	7.2
Payments to Acquire Businesses, Net of Cash Acquired	179.6
Business Combination, Price of Acquisition, Expected	185
Business Combination, Consideration Transferred, Other	$ (3.3)

SCHEDULE OF ASSUMED ASSETS AND

SCHEDULE OF ASSUMED ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 05, 2024	Dec. 31, 2023	Dec. 31, 2022	Nov. 01, 2022
Business Acquisition [Line Items]
Goodwill	$ 3,280.1		$ 3,262.3	$ 3,240.9
Rahi Systems
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents					$ 68.6
Ascent
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		$ 7.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		51.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		58
Goodwill		118.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets		26.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		261.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable		20.9
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation		7.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		46.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		74.9
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		$ 186.8

ACQUISITIONS AND DISPOSALS - Ca

ACQUISITIONS AND DISPOSALS - Canadian Divestitures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Gain (Loss) on Disposition of Business	$ (122.2)	$ 0	$ 0

ACQUISITIONS AND DISPOSALS- SYL

ACQUISITIONS AND DISPOSALS- SYLVANIA (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 221.3	$ 0	$ 186.8

PROPERTY, BUILDINGS AND EQUIP_3

PROPERTY, BUILDINGS AND EQUIPMENT - SCHEDULE OF PROPERTY, BUILDINGS AND EQUIPMENT (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (554.1)	$ (502.5)
Property, buildings and equipment, net	442.9	423.6
Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization	257.8	195.4
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	246.9	202.6
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	404.4	359.9
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	316.5	292.6
Depreciable [Member]
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	967.8	855.1
Property, buildings and equipment, net	413.7	352.6
Land
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	25.3	25
Construction in progress
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	$ 3.9	$ 46

PROPERTY, BUILDINGS AND EQUIP_4

PROPERTY, BUILDINGS AND EQUIPMENT - PROPERTY, BUILDINGS AND EQUIPMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 66.8	$ 56.3	$ 47.8
Capitalized software amortization	30.3	36.4	$ 38.3
Unamortized software cost	88.9	78.2
Property, Plant and Equipment [Line Items]
Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization	257.8	195.4
Finance Lease, Right-of-Use Asset, Accumulated Amortization	27.6	19.9
Finance Lease, Right-of-Use Asset, before Accumulated Amortization	85.4	51.9
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, gross	$ 316.5	$ 292.6

LEASES (Details)

LEASES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	6 years
Operating Lease, Weighted Average Discount Rate, Percent	4.70%	4.30%
Option to Extend Lessee's Operating Lease, Lease Payments	$ 10.3
Lessee, Operating Lease, Lease Not yet Commenced, Payments	$ 117.6
Lessee, Operating Lease, Lease Not yet Commenced, Description	These operating leases, which are not recorded in the Consolidated Balance Sheet as of December 31, 2024, will commence in 2025 with lease terms of 1 to 10 year

LEASES Supplemental balance she

LEASES Supplemental balance sheet information (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 735.1	$ 761.2
Operating Lease, Liability, Noncurrent	614.8	641.7
Operating Lease, Liability	$ 784.3	$ 798.4
Other Current Liabilities
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current

LEASES Lease, Cost (Details)

LEASES Lease, Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 223.6	$ 197	$ 175.8
Short-term Lease, Cost	6.9	8.9	4.8
Variable Lease, Cost	60.3	53.2	45.7
Lease, Cost	$ 290.8	$ 259.1	$ 226.4

LEASES Supplemental Cash Flow I

LEASES Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating Lease, Payments	$ 212.7	$ 174.5	$ 171.7
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 205.5	$ 296.9	$ 267.1

LEASES Lessee, Operating Lease,

LEASES Lessee, Operating Lease, Liability, Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 205.2
Lessee, Operating Lease, Liability, Payments, Due Year Two	178.5
Lessee, Operating Lease, Liability, Payments, Due Year Three	149.9
Lessee, Operating Lease, Liability, Payments, Due Year Four	116
Lessee, Operating Lease, Liability, Payments, Due Year Five	83.9
Lessee, Operating Lease, Liability, Payments, Due after Year Five	161.7
Lessee, Operating Lease, Liability, Payments, Due	895.2
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(110.9)
Operating Lease, Liability	$ 784.3	$ 798.4

DEBT - SCHEDULE OF DEBT (Detail

DEBT - SCHEDULE OF DEBT (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	$ 4.4
Total debt	5,107.7	$ 5,359
Debt Instrument, Unamortized Premium	0.1	0.1
Debt Issuance Costs, Net	(42.8)	(37.4)
Less current and short-term portion	(19.5)	(8.6)
Total Long-term Debt, Excluding Current Maturities	$ 5,045.5	$ 5,313.1
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Total Long-term Debt, Excluding Current Maturities	Total Long-term Debt, Excluding Current Maturities
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt	$ 0.6	$ 1
Accounts receivable securitization facility
Debt Instrument [Line Items]
Long-term debt	1,450	1,550
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	525	953
A7125 Senior Notes Due 2025
Debt Instrument [Line Items]
Long-term debt	0	1,500
Debt Instrument, Face Amount	1,500
A7250 Senior Notes Due 2028
Debt Instrument [Line Items]
Long-term debt	1,320.6	1,319.4
Debt Instrument, Unamortized Discount	4.4	5.6
Debt Instrument, Face Amount	1,325
6.375% Senior Notes due 2029
Debt Instrument [Line Items]
Long-term debt	900	0
Debt Instrument, Face Amount	900
6.625% Senior Notes due 2032
Debt Instrument [Line Items]
Long-term debt	850	0
Debt Instrument, Face Amount	850
6.00% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	4.2	$ 4.2
Debt Instrument, Face Amount	$ 250

DEBT (Details)

DEBT (Details) - USD ($)	10 Months Ended	12 Months Ended									24 Months Ended			36 Months Ended
	Dec. 31, 2024	Mar. 15, 2029	Mar. 14, 2029	Mar. 14, 2028	Mar. 14, 2027	Jun. 14, 2026	Jun. 14, 2025	Dec. 31, 2024	Jun. 14, 2024	Dec. 31, 2023	Jun. 14, 2028	Mar. 14, 2026	Mar. 07, 2024	Mar. 15, 2032	Mar. 14, 2027	Dec. 31, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate																5.39%
Accounts Receivable from Securitization	$ 1,450,000,000							$ 1,450,000,000		$ 1,550,000,000
Line of Credit Facility, Opportunity to Increase Borrowing Capacity								450,000,000
Debt Instrument, Unused Borrowing Capacity, Amount	1,725,000,000							1,725,000,000
Percentage of principal amount of Senior Notes accelerated under default	0.25							0.25
Debt Issuance Costs, Net	(42,800,000)							(42,800,000)		$ (37,400,000)
Long-term Debt, Gross	5,112,100,000							5,112,100,000
Gain (Loss) on Extinguishment of Debt								(6,800,000)
Canadian Dollar Sub-Facility Commitment	625,000,000							625,000,000
6.375% Senior Notes due 2029
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																6.375%
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate										0.85%						1.75%
Long-term debt	600,000							$ 600,000		$ 1,000,000
Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date								Mar. 01, 2027
Debt Instrument, Basis Spread on Variable Rate								1.05%
Accounts Receivable Eligible for Securitization	1,976,300,000							$ 1,976,300,000		2,146,900,000
Line of Credit Facility, Opportunity to Increase Borrowing Capacity	300,000,000							1,850,000,000					$ 125,000,000
Long-term debt	1,450,000,000							$ 1,450,000,000		1,550,000,000
Commitment Fee								0.45%
5.50% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date								Mar. 01, 2023
Long-term debt										58,600,000
Debt Instrument, Interest Rate, Stated Percentage																5.50%
Debt Instrument, Face Amount	350,000,000							$ 350,000,000
6.00% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date								Dec. 01, 2025
Long-term debt	4,200,000							$ 4,200,000		4,200,000
Debt Instrument, Interest Rate, Stated Percentage																6%
Debt Instrument, Face Amount	250,000,000							$ 250,000,000
A7125 Senior Notes Due 2025
Debt Instrument [Line Items]
Debt Instrument, Maturity Date								Jun. 15, 2025
Debt Instrument, Issuance Date								Jun. 12, 2020
Long-term debt	0							$ 0		1,500,000,000
Debt Instrument, Interest Rate, Stated Percentage																7.125%
Debt Instrument, Face Amount	1,500,000,000							1,500,000,000
Discount percentage of par value																100%
Deferred Finance Costs, Gross	33,100,000							$ 33,100,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed								100%	101.781%
A7125 Senior Notes Due 2025 | Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed							100%
A7250 Senior Notes Due 2028
Debt Instrument [Line Items]
Debt Instrument, Maturity Date								Jun. 15, 2028
Debt Instrument, Issuance Date								Jun. 12, 2020
Long-term debt	1,320,600,000							$ 1,320,600,000		1,319,400,000
Debt Instrument, Interest Rate, Stated Percentage																7.25%
Debt Instrument, Face Amount	1,325,000,000							1,325,000,000
Discount percentage of par value																99.244%
Deferred Finance Costs, Gross	29,300,000							$ 29,300,000
A7250 Senior Notes Due 2028 | Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed						101.208%	102.417%				100%
Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Maturity Date								Mar. 01, 2027
Debt Instrument, Interest Rate During Period								5.75%
Debt Instrument, Increase, Additional Borrowings								$ 3,411,000,000		2,997,200,000
Debt Instrument, Decrease, Repayments								3,839,000,000		3,067,500,000
Long-term debt	525,000,000							525,000,000		953,000,000
Line of Credit Facility, Remaining Borrowing Capacity	1,170,400,000							1,170,400,000		736,000,000
Limit on dividends	115,000,000							115,000,000
Revolving credit facility | Letter of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	175,000,000							$ 175,000,000
Accounts Receivable Securitization Facility Amended
Debt Instrument [Line Items]
Debt Instrument, Maturity Date								Mar. 01, 2027
Debt Instrument, Unused Borrowing Capacity, Amount	1,550,000,000							$ 1,550,000,000		1,625,000,000
6.625% Senior Notes due 2032
Debt Instrument [Line Items]
Debt Instrument, Maturity Date								Mar. 15, 2032
Long-term debt	850,000,000							$ 850,000,000		0
Debt Instrument, Interest Rate, Stated Percentage																6.625%	6.625%
Debt Instrument, Face Amount	850,000,000							850,000,000
Deferred Finance Costs, Gross	10,600,000							$ 10,600,000
6.625% Senior Notes due 2032 | Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed			101.657%	103.313%										100%	35%
6.375% Senior Notes due 2029
Debt Instrument [Line Items]
Debt Instrument, Maturity Date								Mar. 15, 2029
Long-term debt	900,000,000							$ 900,000,000		$ 0
Debt Instrument, Interest Rate, Stated Percentage																6.375%	6.375%
Debt Instrument, Face Amount	900,000,000							900,000,000
Deferred Finance Costs, Gross	11,300,000							11,300,000
6.375% Senior Notes due 2029 | Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		100%		101.594%	103.188%							35%
6.375%/6.625% Senior Notes due 2029/2032
Debt Instrument [Line Items]
Discount percentage of par value																100%
Minimum | Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	600,000							600,000
Maximum | Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 9,500,000							$ 9,500,000
Prime Rate [Member] | Minimum | Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate								0%
Prime Rate [Member] | Maximum | Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate								0.50%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate								1%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum | Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate								1.50%

DEBT - SCHEDULE OF MATURITIES O

DEBT - SCHEDULE OF MATURITIES OF LONG-TERM DEBT (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
2021	$ 19.5
2022	14.2
2023	1,987.2
2024	1,333.5
2025	904.6
Thereafter	853.1
Total payments on debt	5,112.1
Debt discount on convertible debentures	(4.4)
Debt and Lease Obligation	$ 5,107.7	$ 5,359

STOCKHOLDERS' EQUITY (Details)

STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	20,000,000								20,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01								$ 0.01
Share Repurchase Program, Authorized, Amount	$ 1,000								$ 1,000
Treasury Stock, Value, Acquired, Cost Method									(428.8)	$ (75)	$ (11.1)
Dividends, Preferred Stock									$ 57.4	57.4	57.4
Preferred Stock, Dividends, Per Share, Cash Paid									$ 0.664
Payments of Ordinary Dividends, Common Stock									$ (81.5)	(76.6)	0
Common Stock, Dividends, Per Share, Declared	$ 0.413	$ 0.413	$ 0.413	$ 0.413	$ 0.375	$ 0.375	$ 0.375	$ 0.375
Dividends, Common Stock	$ (20.1)	$ (20.2)	$ (20.3)	$ (20.9)	$ (19.1)	$ (19.1)	$ (19.2)	$ (19.2)	(81.5)	(76.6)
Retained Earnings (Deficit)
Class of Stock [Line Items]
Dividends, Preferred Stock									57.4	57.4	$ 57.4
Dividends, Common Stock									$ (81.5)	$ (76.6)
Treasury Stock, Common [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired											87,502
Treasury Stock, Value, Acquired, Cost Method											$ (11.1)
Common Stock
Class of Stock [Line Items]
Common Stock, Shares Authorized	210,000,000				210,000,000				210,000,000	210,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01				$ 0.01				$ 0.01	$ 0.01
Common Class B
Class of Stock [Line Items]
Common Stock, Shares Authorized	20,000,000				20,000,000				20,000,000	20,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01				$ 0.01				$ 0.01	$ 0.01
Series A Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	25,000								25,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01								$ 0.01
Preferred Stock, Dividend Payment Rate, Variable									10.325
Preferred Stock, Liquidation Preference Per Share	$ 25,000								$ 25,000
Preferred Stock, Dividend Rate, Percentage									10.625%
Preferred stock, shares issued	21,612								21,612
Depositary Share [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	21,611,534								21,611,534

INCOME TAXES - ADDITIONAL INFOR

INCOME TAXES - ADDITIONAL INFORMATION (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Amortization of intangible assets	$ 545.9	$ 564.5
Deferred Tax Assets, Operating Loss Carryforwards	35.6	36.7
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	41	41.1
Deferred Tax Assets, Valuation Allowance	32.6	23.5
Unrecognized Tax Benefits	131.2	121.3	$ 109.3	$ 107.3
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	36.8	40.1	40.6
Decrease in Unrecognized Tax Benefits is Reasonably Possible	8.7
Interest related to uncertain tax positions	1.6	1.1	$ 2.3
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	7.7	8.9
Undistributed Earnings of Foreign Subsidiaries	2,107.7
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	69.4
Unrecognized Tax Benefits, Income Tax Penalties Accrued	3.7	4.7
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	37.7
Deferred Tax Asset, Interest Carryforward	$ 4.8	2.2
Income Tax Examination, Description	In October 2021, one of the Company’s Mexican affiliates received a tax assessment from the Mexican tax authorities in the amount of approximately $26.0 million related to its 2012 income tax return. This amount, updated for adjustments required under Mexican law, was approximately $28.5 million as of December 31, 2024. The Company believes the assessment is without merit and has filed an annulment lawsuit in the Mexican Federal Court of Administrative Justice. The Company expects to prevail in this litigation and, accordingly, has not recognized a liability for this assessment in its consolidated financial statements.In July 2022, one of the Company’s Canadian affiliates received tax assessments from the Canada Revenue Agency (“CRA”) totaling approximately $11.0 million, including tax and interest, related to its 2012 through 2014 income tax returns. The Company’s Canadian affiliate also received a related penalty assessment of approximately $2.7 million in May 2023. The assessments totaled approximately $18.0 million in the aggregate, including additional interest updated through December 31, 2024. The Company believes these assessments are without merit and has appealed to the Tax Court of Canada. The Company expects to prevail in the courts and, therefore, has not recognized a liability for these assessments in its consolidated financial statements. The CRA continues to audit the 2015 through 2019 tax years of Wesco’s Canadian affiliates and the Company expects to eventually receive similar assessments for these tax years.
General Business Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 4.8	2.9
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Valuation Allowance	0.9	1
Deferred Tax Assets, Operating Loss Carryforwards	3.9	3
Deferred Tax Assets, Valuation Allowance	0.8	0.5
Deferred Tax Asset, Interest Carryforward	4.8	2.2
Domestic Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	4
Foreign Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	31.7	31.4
Operating Loss Carryforwards, Valuation Allowance	19.5	12.9
Deferred Tax Assets, Tax Deferred Expense, Other	6.6	6.1
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 41	$ 41.1

INCOME TAXES - SCHEDULE OF INCO

INCOME TAXES - SCHEDULE OF INCOME BEFORE INCOME TAX, DOMESTIC AND FOREIGN (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
United States	$ 713.7	$ 739.4	$ 859.4
Foreign	237.3	252.6	277.3
Income before income taxes	$ 951	$ 992	$ 1,136.7

INCOME TAXES - SCHEDULE OF COMP

INCOME TAXES - SCHEDULE OF COMPONENTS OF INCOME TAX EXPENSE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current taxes
Federal	$ 150.2	$ 124.8	$ 166.1
State	41.5	34.6	43
Foreign	79.8	74.4	66.7
Total current	271.5	233.8	275.8
Deferred taxes
Federal	(22.8)	(1)	(7.5)
State	(5)	2.7	0.7
Foreign	(12.1)	(9.6)	5.6
Total deferred	(39.9)	(7.9)	(1.2)
Income tax expense	$ 231.6	$ 225.9	$ 274.5

INCOME TAXES - SCHEDULE OF EFFE

INCOME TAXES - SCHEDULE OF EFFECTIVE INCOME TAX RATE RECONCILIATION (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Federal statutory rate	21%	21%	21%
State taxes, net of federal tax benefit	2.90%	3%	3.10%
Effective Income Tax Rate Reconciliation, Deduction, Percent	(1.00%)	(0.90%)	(1.20%)
Foreign Income Tax Expense (Benefit), Continuing Operations	1%	(0.90%)	(0.90%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	1%	1.10%	1.60%
Other	(0.50%)	(0.50%)	0.60%
Effective income tax rate	24.40%	22.80%	24.20%

INCOME TAXES - SCHEDULE OF DEFE

INCOME TAXES - SCHEDULE OF DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred Tax Assets, Net [Abstract]
Accounts receivable	$ 22.4	$ 23.3
Deferred Tax Assets, Inventory	50.7	45.9
Deferred Tax Assets, Property, Plant and Equipment	0	0
Deferred Tax Assets, Property, Plant and Equipment	210.1	201.8
Deferred Tax Assets, Goodwill and Intangible Assets	0	0
Employee benefits	27.8	21.5
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	8.8	11.2
Deferred Tax Asset, Interest Carryforward	4.8	2.2
Tax loss carryforwards	35.6	36.7
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	41	41.1
Other	33.2	38
Deferred taxes, Assets	401.8	398.2
Deferred Tax Liabilities [Abstract]
Depreciation	20.9	41
Deferred Tax Liabilities, Leasing Arrangements	200.3	192
Amortization of intangible assets	545.9	564.5
Other	8.4	10.3
Deferred Tax Assets, Gross	434.4	421.7
Deferred Tax Assets, Valuation Allowance	(32.6)	(23.5)
Deferred Tax Liabilities, Gross	775.5	807.8
State and Local Jurisdiction [Member]
Deferred Tax Assets, Net [Abstract]
Deferred Tax Asset, Interest Carryforward	4.8	2.2
Tax loss carryforwards	3.9	3
Deferred Tax Liabilities [Abstract]
Deferred Tax Assets, Valuation Allowance	$ (0.8)	$ (0.5)

INCOME TAXES - SCHEDULE OF IN_2

INCOME TAXES - SCHEDULE OF INCOME TAX CONTINGENCIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Additions for tax positions of prior years	$ 9.1	$ 6.6	$ 0.9
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation	4.5
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation		0.3	2.6
Unrecognized Tax Benefits [Roll Forward]
Beginning balance January 1	121.3	109.3	107.3
Additions based on tax positions related to the current year	20.5	29.2	14.4
Unrecognized Tax Benefits, Increase Resulting from Acquisition	0	0.9	5.5
Reductions for tax positions of prior years	(2.2)	(6.7)	(1.8)
Settlements	0	(2.5)	0
Lapse in statute of limitations	(13)	(15.8)	(14.5)
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation		0.3	2.6
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation	(4.5)
Ending balance December 31	$ 131.2	$ 121.3	$ 109.3

EARNINGS PER SHARE - SCHEDULE O

EARNINGS PER SHARE - SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accelerated Share Repurchases [Line Items]
Payments for Repurchase of Common Stock	$ 425	$ 75	$ 11.1
Treasury Stock, Common, Shares	25,176,234	22,720,986
Share Repurchase Program, Authorized, Amount	$ 1,000
Preferred Stock Dividends, Income Statement Impact	$ 57.4	$ 57.4	$ 57.4
Weighted average common shares outstanding used in computing basic earnings per share	49,800,000	51,100,000	50,700,000
Common shares issuable upon exercise of dilutive stock options	800,000	1,200,000	1,700,000
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share	50,600,000	52,300,000	52,400,000
Earnings Per Share attributable to WESCO International, Inc.
Basic	$ 13.26	$ 13.86	$ 15.83
Diluted	$ 13.05	$ 13.54	$ 15.33
Net Income (Loss) Available to Common Stockholders, Basic	$ 660.2	$ 708.1	$ 803.1
Net Income attributable to WESCO International, Inc.	$ 717.6	$ 765.5	$ 860.5
Treasury Stock, Common [Member]
Accelerated Share Repurchases [Line Items]
Treasury Stock, Shares, Acquired			87,502

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Treasury Stock, Common, Shares	25,176,234	22,720,986
Payments for Repurchase of Common Stock	$ 425	$ 75	$ 11.1
Treasury Stock, Value, Acquired, Cost Method	428.8	75	11.1
Treasury Stock, Value, Acquired, Cost Method	$ 428.8	$ 75	$ 11.1
Stock Appreciation Rights (SARs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share	200,000	200,000	100,000
Treasury Stock, Common [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Treasury Stock, Shares, Acquired			87,502
Treasury Stock, Value, Acquired, Cost Method			$ 11.1
Treasury Stock, Value, Acquired, Cost Method			$ 11.1

EMPLOYEE BENEFIT PLANS TEXTUALS

EMPLOYEE BENEFIT PLANS TEXTUALS (Details) $ in Millions		3 Months Ended	12 Months Ended
	Feb. 12, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) numberOfPlans	Dec. 31, 2023 USD ($) numberOfPlans	Dec. 31, 2022 USD ($)
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, cost recognized			$ 74.4	$ 73.4	$ 58.2
Defined Benefit Plan, Description			Wesco sponsors a contributory defined benefit plan covering substantially all Canadian employees of EECOL Electric Corp., a wholly-owned subsidiary of the Company (the “EECOL Plan”). The EECOL Plan provides retirement benefits based on earnings and credited service, and participants contribute 2% of their earnings to the EECOL Plan. Participants become 100% vested after two years of continuous service or, if earlier, at the participant’s normal retirement age.
Defined Benefit Plan, Unfunded Plan			Wesco also sponsors a Supplemental Executive Retirement Plan for certain executives of EECOL Electric Corp. (the “EECOL SERP”), which provides additional pension benefits based on earnings and credited service. Effective January 1, 2013, the EECOL SERP was closed to new participants and existing participants became 100% vested. Participants of the EECOL SERP now contribute 4% of their earnings to the EECOL Plan.Anixter Inc. sponsored the Anixter Inc. Pension Plan (the “Domestic Plan”), which was closed to entrants first hired or rehired on or after July 1, 2015, and sponsors various defined benefit pension plans covering employees of foreign subsidiaries in Canada and Europe (together with the EECOL Plan and the EECOL SERP, the “Foreign Plans”). The majority of the Company’s defined benefit pension plans are non-contributory, and with the exception of the U.S. and Canada, cover substantially all full-time employees in their respective countries. Retirement benefits are provided based on compensation as defined in each of the plan agreements.
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.80%	4.80%	4.40%
Defined Benefit Plan, Benefit Obligation		$ 274.1	$ 274.1	$ 456.6	520.8
DefinedBenefitPlanNumberOfPlansWithProjectedBenefitObligationsInExcessOfFairValueOfPlanAssets | numberOfPlans			7	9
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation		31.5	$ 31.5	$ 215
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets		21.1	21.1	183.8
Defined Benefit Plan, Plan Assets, Amount		294.5	$ 294.5	$ 473.8	552.7
DefinedBenefitPlanNumberOfPlansWithAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssets | numberOfPlans			6	9
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation		15.3	$ 15.3	$ 208.6
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets		7.4	7.4	183.8
Service Cost			$ 1.9	4.7	8.3
Defined Benefit Plan Assets Actual Gain Loss			1.80%
Increase (Decrease) in Other Operating Assets			$ 142.6	60.6	153.2
Settlement			$ (139.6)	(115.1)
WESCO [Member]
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, employer matching contribution, percent			50%
Defined contribution plan, maximum annual contribution per employee, percent			6%
Defined contribution plan, employer discretionary contribution amount			$ 8.9
WESCO Deferred Compensation Plan
Schedule of Employee Benefit Plans [Line Items]
Deferred Compensation Liability, Classified, Noncurrent		$ 32.5	$ 32.5	$ 27.4
Canadian Defined Contribution Plan Merger
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, employer matching contribution, percent			50%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			4%
U.S. Defined Contribution Plan Merger
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, employer matching contribution, percent			100%
Foreign Plan [Member]
Schedule of Employee Benefit Plans [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.80%	4.80%	4.40%
Defined Benefit Plan, Benefit Obligation		$ 274.1	$ 274.1	$ 309.1	267.3
Defined Benefit Plan, Plan Assets, Amount		294.5	294.5	295.7	267.6
Accumulated Benefit Obligation (ABO) at December 31		268.1	268.1	302.5
Service Cost			1.9	4.7	8.3
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year		7.1	7.1
Defined Benefit Plan, Expected Future Benefit Payment, Year One		10.3	10.3
Settlement			(0.8)	$ (4.2)
United States
Schedule of Employee Benefit Plans [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				4.50%
Defined Benefit Plan, Benefit Obligation		0	0	$ 147.5	253.5
Defined Benefit Plan, Plan Assets, Amount		0	0	178.1	285.1
Accumulated Benefit Obligation (ABO) at December 31		0	0	147.5
Service Cost			0	0	0
Settlement	$ 138.8		(138.8)	(110.9)
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan		$ 24.6	33.6
Excise and Sales Taxes			$ 4.9
Minimum | Canadian Defined Contribution Plan Merger
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, employer matching contribution, percent			3%
Minimum | U.S. Defined Contribution Plan Merger
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, employer matching contribution, percent			3%
Maximum | Canadian Defined Contribution Plan Merger
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, employer matching contribution, percent			5%
Maximum | U.S. Defined Contribution Plan Merger
Schedule of Employee Benefit Plans [Line Items]
Defined contribution plan, employer matching contribution, percent			4%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			50%
Pension Plan [Member]
Schedule of Employee Benefit Plans [Line Items]
Other Nonoperating Gains (Losses)			$ 1.6	$ 0.2	$ (14.8)

EMPLOYEE BENEFIT PLANS Benefit

EMPLOYEE BENEFIT PLANS Benefit Obligations, Plan Assets, and Funded Status (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Feb. 12, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure
Defined Benefit Plan, Benefit Obligation		$ 274.1	$ 274.1	$ 456.6	$ 520.8
Service Cost			1.9	4.7	8.3
Interest cost			14.2	23.3
Participant contributions			0.1	1
Actuarial (gain) loss			(24.1)	32.1
Defined Benefit Plan, Benefit Obligation, Benefits Paid			(17.4)	(19.8)
DefinedBenefitPlanBenefitsPaidFromCompanyAssets			(0.4)	(0.5)
Curtailment			(0.2)	0
Settlement			(139.6)	(115.1)
Foreign Currency Translation Gain (Loss)			(17)	10.1
Defined Benefit Plan, Plan Assets, Amount		294.5	294.5	473.8	552.7
Actual return on plan assets			6.8	36.1
Participant contributi			0.1	1
Company contributions			(13.6)	(10.2)
Defined Benefit Plan, Plan Assets, Benefits Paid			(17.8)	(20.3)
Settlement			(139.6)	(115.1)
Foreign Currency Translation Gain (Loss)			(15.2)	9.2
Funded status		20.4	20.4	17.2
Assets for Plan Benefits, Defined Benefit Plan		30.8	30.8	48.6
Current liabilities		(0.4)	(0.4)	(0.4)
Non-current liabilities		$ (10)	$ (10)	$ (31)
Discount rate		4.80%	4.80%	4.40%
Average salary increases		3.20%	3.20%	3.30%
United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Benefit Obligation		$ 0	$ 0	$ 147.5	253.5
Service Cost			0	0	0
Interest cost			1.1	10.4
Participant contributions			0	0
Actuarial (gain) loss			(4)	2.6
Defined Benefit Plan, Benefit Obligation, Benefits Paid			(5.8)	(8.1)
DefinedBenefitPlanBenefitsPaidFromCompanyAssets			0	0
Curtailment			0	0
Settlement	$ 138.8		(138.8)	(110.9)
Foreign Currency Translation Gain (Loss)			0	0
Defined Benefit Plan, Plan Assets, Amount		0	0	178.1	285.1
Actual return on plan assets			(2.8)	12
Participant contributi			0	0
Company contributions			(33.6)	0
Defined Benefit Plan, Plan Assets, Benefits Paid			(5.8)	(8.1)
Settlement			(138.8)	(110.9)
Foreign Currency Translation Gain (Loss)			2.9	0
Funded status		0	0	30.6
Assets for Plan Benefits, Defined Benefit Plan		0	0	30.6
Current liabilities		0	0	0
Non-current liabilities		0	0	$ 0
Discount rate				4.50%
Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Benefit Obligation		274.1	274.1	$ 309.1	267.3
Service Cost			1.9	4.7	8.3
Interest cost			13.1	12.9
Participant contributions			0.1	1
Actuarial (gain) loss			(20.1)	29.5
Defined Benefit Plan, Benefit Obligation, Benefits Paid			(11.6)	(11.7)
DefinedBenefitPlanBenefitsPaidFromCompanyAssets			(0.4)	(0.5)
Curtailment			(0.2)	0
Settlement			(0.8)	(4.2)
Foreign Currency Translation Gain (Loss)			(17)	10.1
Defined Benefit Plan, Plan Assets, Amount		294.5	294.5	295.7	$ 267.6
Actual return on plan assets			9.6	24.1
Participant contributi			0.1	1
Company contributions			(20)	(10.2)
Defined Benefit Plan, Plan Assets, Benefits Paid			(12)	(12.2)
Settlement			(0.8)	(4.2)
Foreign Currency Translation Gain (Loss)			(18.1)	9.2
Funded status		20.4	20.4	(13.4)
Assets for Plan Benefits, Defined Benefit Plan		30.8	30.8	18
Current liabilities		(0.4)	(0.4)	(0.4)
Non-current liabilities		$ (10)	$ (10)	$ (31)
Discount rate		4.80%	4.80%	4.40%
Average salary increases		3.20%	3.20%	3.30%
UNITED KINGDOM
Defined Benefit Plan Disclosure
Company contributions		$ (13.5)

EMPLOYEE BENEFIT PLANS Pension

EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure
Service Cost	$ 1.9	$ 4.7	$ 8.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Total net periodic pension (benefit) cost	$ 3.5	$ 4.9	$ (6.5)
United States
Defined Benefit Plan Disclosure
Service Cost	$ 0	$ 0	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Total net periodic pension (benefit) cost	$ 3.3	$ 5.5	$ (5.7)
Foreign Plan [Member]
Defined Benefit Plan Disclosure
Service Cost	$ 1.9	$ 4.7	$ 8.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Total net periodic pension (benefit) cost	$ 0.2	$ (0.6)	$ (0.8)

EMPLOYEE BENEFIT PLANS Assumpti

EMPLOYEE BENEFIT PLANS Assumptions (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount Rate	4.40%	4.60%	2.60%
Expected Long-term Rate of Return on Plan Assets	4.80%	5.10%	4.60%
Rate of Compensation Increase	3.30%	3.40%	3.40%
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount Rate	4.40%	4.80%	2.40%
Expected Long-term Rate of Return on Plan Assets	5.10%	5.50%	5%
Rate of Compensation Increase	3.30%	3.40%	3.40%
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount Rate	4.50%	4.40%	2.90%
Expected Long-term Rate of Return on Plan Assets	4.50%	4.80%	4.30%

EMPLOYEE BENEFIT PLANS - AOCI (

EMPLOYEE BENEFIT PLANS - AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Postemployment Benefits [Abstract]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	$ (41.5)	$ (22.5)	$ (40.6)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(0.1)	0
Actuarial (Gain) Loss Arising During Period, before Tax	$ (17)	$ 19.6
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Settlement	$ (2.1)	$ (2.8)
Foreign currency translation Gain Loss	(0.7)	(1)
Prior Service Cost (Credit), before Tax	(0.1)	(0.2)
Actuarial (Gain) Loss, before Tax	(41.4)	(22.3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	8.5	2.8
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(33)	(19.7)
Other Comprehensive Income (Loss), Defined Benefit Plan, Curtailment Gain (Loss), before Tax	$ 0.2	$ 0

EMPLOYEE BENEFIT PLANS Benefi_2

EMPLOYEE BENEFIT PLANS Benefit payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Payment for Settlement	$ 139.6	$ 115.1
United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Payment for Settlement	138.8	110.9
Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Expected Future Benefit Payment, Year One	10.3
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	10.8
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	11.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	14.6
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	15.1
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years	89
Defined Benefit Plan, Plan Assets, Payment for Settlement	$ 0.8	$ 4.2

EMPLOYEE BENEFIT PLANS Asset al

EMPLOYEE BENEFIT PLANS Asset allocations (Details)	Dec. 31, 2024	Dec. 31, 2023
United States
Defined Benefit Plan Disclosure
Total investments		100%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		100%
Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	100%	100%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	100%	100%
Defined Benefit Plan, Equity Securities | United States
Defined Benefit Plan Disclosure
Total investments		4%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		4%
Defined Benefit Plan, Equity Securities | United States | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		0%
Defined Benefit Plan, Equity Securities | United States | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		35%
Defined Benefit Plan, Equity Securities | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	17.60%	19.70%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	19%	21%
Defined Benefit Plan, Equity Securities | Foreign Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	0%	12%
Defined Benefit Plan, Equity Securities | Foreign Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	44%	29%
US Treasury and Government | United States
Defined Benefit Plan Disclosure
Total investments		17.30%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		17%
US Treasury and Government | United States | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		0%
US Treasury and Government | United States | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		0%
US Treasury and Government | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	0.70%	0.80%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	1%	1%
US Treasury and Government | Foreign Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	0%	0%
US Treasury and Government | Foreign Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	0%	0%
Corporate Debt Securities | United States
Defined Benefit Plan Disclosure
Total investments		40.50%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		41%
Corporate Debt Securities | United States | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		0%
Corporate Debt Securities | United States | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		0%
Corporate Debt Securities | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	3.30%	3.20%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	3%	1%
Corporate Debt Securities | Foreign Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	1%	1%
Corporate Debt Securities | Foreign Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	25%	31%
Other Debt Obligations | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	66.80%	63.70%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	66%	67%
Other Debt Obligations | Foreign Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	37%	48%
Other Debt Obligations | Foreign Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	92%	78%
Defined Benefit Plan, Debt Security | United States
Defined Benefit Plan Disclosure
Total investments		57.80%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		58%
Defined Benefit Plan, Debt Security | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	70.80%	67.70%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	70%	69%
Real Estate Funds | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	3.70%	4%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	3%	2%
Real Estate Funds | Foreign Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	0%	2%
Real Estate Funds | Foreign Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	9%	8%
Other Investments [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	0.60%	1.50%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	1%	1%
Other Investments [Member] | Foreign Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	0%	0%
Other Investments [Member] | Foreign Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	8%	8%
Insurance product | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	7.30%	7.10%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	7%	7%
Insurance product | Foreign Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	7%	7%
Insurance product | Foreign Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	7%	7%
Cash Equivalents | United States
Defined Benefit Plan Disclosure
Total investments		38.20%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		38%
Cash Equivalents | United States | Minimum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		0%
Cash Equivalents | United States | Maximum [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		0%

EMPLOYEE BENEFIT PLANS Fair val

EMPLOYEE BENEFIT PLANS Fair value plan assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 294.5	$ 473.8	$ 552.7
Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	100%	100%
Defined Benefit Plan, Plan Assets, Amount	$ 294.5	$ 295.7	267.6
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	100%	100%
United States
Defined Benefit Plan Disclosure
Total investments		100%
Defined Benefit Plan, Plan Assets, Amount	$ 0	$ 178.1	$ 285.1
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		100%
Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 72.5
Level 1 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	1.8	4.5
Level 1 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		68
Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		20.9
Level 2 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	21.4	20.9
Level 2 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Level 3 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Level 3 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		380.4
Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 271.3	270.3
Fair Value Measured at Net Asset Value Per Share | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		110.1
Other Investments [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 4.5
Other Investments [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	0.60%	1.50%
Defined Benefit Plan, Plan Assets, Amount	$ 1.8	$ 4.5
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	1%	1%
Other Investments [Member] | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 4.5
Other Investments [Member] | Level 1 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 1.8	4.5
Other Investments [Member] | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Other Investments [Member] | Level 2 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Investments [Member] | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Other Investments [Member] | Level 3 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Investments [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Other Investments [Member] | Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
Defined Benefit Plan, Equity Securities
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 65.5
Defined Benefit Plan, Equity Securities | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	17.60%	19.70%
Defined Benefit Plan, Plan Assets, Amount	$ 51.8	$ 58.3
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	19%	21%
Defined Benefit Plan, Equity Securities | United States
Defined Benefit Plan Disclosure
Total investments		4%
Defined Benefit Plan, Plan Assets, Amount		$ 7.2
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		4%
Defined Benefit Plan, Equity Securities | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 0
Defined Benefit Plan, Equity Securities | Level 1 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
Defined Benefit Plan, Equity Securities | Level 1 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Defined Benefit Plan, Equity Securities | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Defined Benefit Plan, Equity Securities | Level 2 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Defined Benefit Plan, Equity Securities | Level 2 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Defined Benefit Plan, Equity Securities | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Defined Benefit Plan, Equity Securities | Level 3 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Defined Benefit Plan, Equity Securities | Level 3 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Defined Benefit Plan, Equity Securities | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		65.5
Defined Benefit Plan, Equity Securities | Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 51.8	58.3
Defined Benefit Plan, Equity Securities | Fair Value Measured at Net Asset Value Per Share | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		7.2
US Treasury and Government
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 33.3
US Treasury and Government | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	0.70%	0.80%
Defined Benefit Plan, Plan Assets, Amount	$ 2	$ 2.4
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	1%	1%
US Treasury and Government | United States
Defined Benefit Plan Disclosure
Total investments		17.30%
Defined Benefit Plan, Plan Assets, Amount		$ 30.9
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		17%
US Treasury and Government | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 0
US Treasury and Government | Level 1 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
US Treasury and Government | Level 1 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
US Treasury and Government | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
US Treasury and Government | Level 2 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
US Treasury and Government | Level 2 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
US Treasury and Government | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
US Treasury and Government | Level 3 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
US Treasury and Government | Level 3 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
US Treasury and Government | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		33.3
US Treasury and Government | Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 2	2.4
US Treasury and Government | Fair Value Measured at Net Asset Value Per Share | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		30.9
Corporate Debt Securities
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 81.6
Corporate Debt Securities | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	3.30%	3.20%
Defined Benefit Plan, Plan Assets, Amount	$ 9.8	$ 9.6
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	3%	1%
Corporate Debt Securities | United States
Defined Benefit Plan Disclosure
Total investments		40.50%
Defined Benefit Plan, Plan Assets, Amount		$ 72
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		41%
Corporate Debt Securities | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 0
Corporate Debt Securities | Level 1 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
Corporate Debt Securities | Level 1 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Corporate Debt Securities | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Corporate Debt Securities | Level 2 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Corporate Debt Securities | Level 2 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Corporate Debt Securities | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Corporate Debt Securities | Level 3 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Corporate Debt Securities | Level 3 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Corporate Debt Securities | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		81.7
Corporate Debt Securities | Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 9.8	9.6
Corporate Debt Securities | Fair Value Measured at Net Asset Value Per Share | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		72
Other Debt Obligations
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 188.2
Other Debt Obligations | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	66.80%	63.70%
Defined Benefit Plan, Plan Assets, Amount	$ 196.8	$ 188.2
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	66%	67%
Other Debt Obligations | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 0
Other Debt Obligations | Level 1 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
Other Debt Obligations | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Other Debt Obligations | Level 2 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Debt Obligations | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Other Debt Obligations | Level 3 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Debt Obligations | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		188.2
Other Debt Obligations | Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 196.8	188.2
Real Estate Funds
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 11.8
Real Estate Funds | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	3.70%	4%
Defined Benefit Plan, Plan Assets, Amount	$ 10.9	$ 11.8
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	3%	2%
Real Estate Funds | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 0
Real Estate Funds | Level 1 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
Real Estate Funds | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Real Estate Funds | Level 2 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Real Estate Funds | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Real Estate Funds | Level 3 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Real Estate Funds | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		11.8
Real Estate Funds | Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 10.9	11.8
Insurance product
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 20.9
Insurance product | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Total investments	7.30%	7.10%
Defined Benefit Plan, Plan Assets, Amount	$ 21.4	$ 20.9
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	7%	7%
Insurance product | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 0
Insurance product | Level 1 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
Insurance product | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		20.9
Insurance product | Level 2 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	21.4	20.9
Insurance product | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Insurance product | Level 3 | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	0	0
Insurance product | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Insurance product | Fair Value Measured at Net Asset Value Per Share | Foreign Plan [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
Cash Equivalents
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 68
Cash Equivalents | United States
Defined Benefit Plan Disclosure
Total investments		38.20%
Defined Benefit Plan, Plan Assets, Amount		$ 68
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities		38%
Cash Equivalents | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 68
Cash Equivalents | Level 1 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		68
Cash Equivalents | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Cash Equivalents | Level 2 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Cash Equivalents | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Cash Equivalents | Level 3 | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Cash Equivalents | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		0
Cash Equivalents | Fair Value Measured at Net Asset Value Per Share | United States
Defined Benefit Plan Disclosure
Defined Benefit Plan, Plan Assets, Amount		$ 0

STOCK-BASED COMPENSATION (Detai

STOCK-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2028	Dec. 31, 2027	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase to Number of Shares Authorized to be Issued					2,150,000
Stock-based compensation expense					$ 28.9	$ 48.1	$ 46.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 80.6	172.8	68.3
Common Stock, Capital Shares Reserved for Future Issuance					1,565,398
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized					$ 52.6
Share-based Payment Arrangement, Expense, Tax Benefit					$ 19.1	$ 40.8	$ 15.8
Risk free interest rate					4.20%	4.10%	2%
Expected life (in years)					5 years	5 years	7 years
Expected volatility					55%	50%	43%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate					1.09%	0.89%
Share-Based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross					85,425	78,729	92,799
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 72.05	$ 76.69	$ 57.15
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 15.2
Granted					0	0	0
Restricted Stock Units (RSUs)
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, Nonvested, Number					427,570	407,613	774,233	974,162
Granted					249,757	177,659	234,800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 158.78	$ 169.65	$ 122.13
Performance Shares [Member]
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, Nonvested, Number					214,517	254,859	335,329	380,819
Granted					194,599	212,656	83,991
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 109.04	$ 87.04	$ 122.09
Performance Shares [Member] | 2023 Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted					80,951
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 152.07
Performance Shares [Member] | 2020 Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted					111,521
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 77.08
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense					$ 28.9	$ 48.1	$ 46.4
Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0.4	$ 4.2	$ 18.4	$ 29.6

STOCK-BASED COMPENSATION - SCHE

STOCK-BASED COMPENSATION - SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangements By Share Based Payment Award, Options and Stock Appreciation Rights Outstanding [Roll Forward]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 63.29	$ 66.70	$ 61.90
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	78,399	28,411	879
Performance Shares [Member]
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, Nonvested, Number	214,517	254,859	335,329	380,819
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 109.04	$ 87.04	$ 122.09
Share Based Compensation Arrangements By Share Based Payment Award, Options and Stock Appreciation Rights Outstanding [Roll Forward]
Stock-settled appreciation rights granted	194,599	212,656	83,991
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangements By Share Based Payment Award, Options and Stock Appreciation Rights Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised	118,513	428,500	113,382
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures	727	1,331	8,891
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 76.25	$ 74.57	$ 73.35
Weighted Average Remaining Contractual Term, Outstanding	4 years 1 month 6 days
Weighted Average Remaining Contractual Term, Exercisable	4 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding	$ 85.3
Aggregate Intrinsic Value, Exercisable	$ 85.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	699,044	777,479	1,083,320
Stock-settled appreciation rights granted	0	0	0
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 58.90	$ 58.64	$ 61.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 58.90	$ 59.55	$ 62.02	$ 62.09
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	699,044	818,284	1,248,115	1,370,388
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 0	$ 0	$ 0
Share-Based Payment Arrangement, Option
Share Based Compensation Arrangements By Share Based Payment Award, Options and Stock Appreciation Rights Outstanding [Roll Forward]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	128.40	122.09	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 154.32	148.67	122.09
Weighted Average Remaining Contractual Term, Exercisable	7 years 6 months
Aggregate Intrinsic Value, Exercisable	$ 3.5
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 136.60	121.53	122.09
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	147.08	144.51	121.55	$ 0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 152.07	$ 169.72	$ 121.58
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number	234,814	163,082	87,347	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	85,425	78,729	92,799
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(3,495)	(1,279)	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period	(10,198)	(1,715)	(5,452)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	8 years 1 month 6 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value	$ 8

STOCK-BASED COMPENSATION - SUMM

STOCK-BASED COMPENSATION - SUMMARY OF RESTRICTED STOCK UNITS AND PERFORMANCE-BASED AWARDS (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested, Shares	214,517	254,859	335,329	380,819
Granted	194,599	212,656	83,991
Vested in Period	(223,042)	(289,394)	(115,394)
Unvested, Weighted Average Fair Value	$ 147.19	$ 115.15	$ 75.26	$ 59.23
Granted, Weighted Average Fair Value	109.04	87.04	122.09
Vested in Period, Weighted Average Fair Value	$ 77.08	$ 48.32	$ 54.64
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(11,899)	(3,732)	(14,087)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 151.11	$ 111	$ 60.75
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested, Shares	427,570	407,613	774,233	974,162
Granted	249,757	177,659	234,800
Vested in Period	(195,578)	(508,173)	(393,194)
Unvested, Weighted Average Fair Value	$ 149.84	$ 127.49	$ 73.79	$ 53.48
Granted, Weighted Average Fair Value	158.78	169.65	122.13
Vested in Period, Weighted Average Fair Value	$ 115.66	$ 59.72	$ 53.13
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(34,222)	(36,106)	(41,535)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 141.98	$ 137.28	$ 66.30

STOCK-BASED COMPENSATION - SC_2

STOCK-BASED COMPENSATION - SCHEDULE OF SHARE-BASED PAYMENT AWARDS, VALUATION ASSUMPTIONS (Details) - shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	4.20%	4.10%	2%
Expected life (in years)	5 years	5 years	7 years
Expected volatility	55%	50%	43%
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-settled appreciation rights granted	0	0	0

STOCK-BASED COMPENSATION - SC_3

STOCK-BASED COMPENSATION - SCHEDULE OF SHARE-BASED PAYMENT AWARD, PERFORMANCE-BASED AWARDS, VALUATION ASSUMPTIONS (Details)	12 Months Ended
	Dec. 31, 2024 Rate	Dec. 31, 2023 Rate	Dec. 31, 2022 Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
WESCO expected volatility	55%	50%	43%
Risk-free interest rate	4.20%	4.10%	2%

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Dec. 31, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Letters of Credit Outstanding, Amount	$ 48.2

BUSINESS SEGMENTS - Schedule of

BUSINESS SEGMENTS - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 21,818.8	$ 22,385.2	$ 21,420.1
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization	17,106.2	17,541.5	16,758.8
Depreciation and amortization	183.2	181.3	179
Stock-based compensation expense	28.9	48.1	46.4
Selling, general and administrative expense	3,306.2	3,256	3,044.2
Interest Income (Expense), Nonoperating	(364.9)	(389.3)	(294.4)
Other, net	92.7	(25.1)	(7)
Income before income taxes	$ 951	$ 992	$ 1,136.7
Segment Reporting, Other Segment Item, Composition, Description	(2) Other segment items primarily includes allocated expenses (which includes employee-related allocations), transportation costs, facility costs (including rent and utilities), employee expenses (including travel and entertainment), credit losses, professional and consulting fees, supplies, real estate and personal property taxes, sales promotion expenses, and gains (losses) on the sale, disposal, or abandonment of property and equipment.	(2) Other segment items primarily includes allocated expenses (which includes employee-related allocations), transportation costs, facility costs (including rent and utilities), employee expenses (including travel and entertainment), credit losses, professional and consulting fees, supplies, real estate and personal property taxes, sales promotion expenses, and gains (losses) on the sale, disposal, or abandonment of property and equipment.	(2) Other segment items primarily includes allocated expenses (which includes employee-related allocations), transportation costs, facility costs (including rent and utilities), employee expenses (including travel and entertainment), credit losses, professional and consulting fees, supplies, real estate and personal property taxes, sales promotion expenses, and gains (losses) on the sale, disposal, or abandonment of property and equipment.
Operating Segments
Segment Reporting Information [Line Items]
Selling, general, and administrative payroll expenses	$ 1,713.6	$ 1,741.7	$ 1,602.8
Segment Reporting, Other Segment Item, Amount	1,017	951.5	930.9
Adjusted EBITDA	1,982	2,150.5	2,127.6
Depreciation and amortization	146.8	140	134.3
Other Operating Income (Expense), Net	(50.9)	82.9	(1.3)
Stock-based compensation expense	14.1	14.2	17.6
Other, net	50.9	(82.9)	1.3
EES
Segment Reporting Information [Line Items]
Net sales	8,546.8	8,610.3	8,823.3
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization	6,517.8	6,576.2	6,708
Selling, general, and administrative payroll expenses	854.6	872.2	822.1
Segment Reporting, Other Segment Item, Amount	456.9	434.5	441.9
Adjusted EBITDA	$ 717.5	$ 727.4	$ 851.3
Adjusted EBITDA Margin Percentage	8.40%	8.40%	9.60%
Depreciation and amortization	$ 46.8	$ 43.3	$ 42.6
Other, net	(10.5)	(10.1)	2
CSS
Segment Reporting Information [Line Items]
Net sales	7,537	7,152.2	6,401.5
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization	5,918.4	5,524.6	4,944.5
Selling, general, and administrative payroll expenses	614.1	594	516.7
Segment Reporting, Other Segment Item, Amount	383.4	349.8	341.3
Adjusted EBITDA	$ 621.1	$ 683.8	$ 599
Adjusted EBITDA Margin Percentage	8.20%	9.60%	9.40%
Depreciation and amortization	$ 71.5	$ 71.7	$ 68.4
Other, net	(59.8)	(74.2)	1.3
UBS
Segment Reporting Information [Line Items]
Net sales	5,735	6,622.7	6,195.3
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization	4,670	5,440.7	5,106.3
Selling, general, and administrative payroll expenses	244.9	275.5	264
Segment Reporting, Other Segment Item, Amount	176.7	167.2	147.7
Adjusted EBITDA	$ 643.4	$ 739.3	$ 677.3
Adjusted EBITDA Margin Percentage	11.20%	11.20%	10.90%
Depreciation and amortization	$ 28.5	$ 25	$ 23.3
Other, net	121.2	1.4	(2)
Corporate Segment
Segment Reporting Information [Line Items]
Depreciation and amortization	36.4	41.3	44.7
Selling, general and administrative expense	561.5	548.6	492.9
Interest Income (Expense), Nonoperating	364.9	389.3	294.4
Other, net	$ (41.8)	$ (57.8)	$ 8.3

BUSINESS SEGMENTS (Details)

BUSINESS SEGMENTS (Details)	12 Months Ended
	Dec. 31, 2024 Employees countries segment
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment	3
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	Chief Executive Officer [Member]
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	The CODM allocates resources and evaluates the performance of the Company’s reportable segments based on adjusted earnings before interest, taxes, depreciation and amortization (“adjusted EBITDA”), which is the Company’s measure of segment profit or loss. The CODM considers budget-to-actual and year-over-year variances for net sales and adjusted EBITDA when making decisions about allocating resources to the segments.
EES
Segment Reporting Information [Line Items]
Entity Number of Employees	6,700
Additional countries (in countries) | countries	50
CSS
Segment Reporting Information [Line Items]
Entity Number of Employees	4,700
Additional countries (in countries) | countries	50
UBS
Segment Reporting Information [Line Items]
Entity Number of Employees	2,300

SEGMENTS AND RELATED INFORMATIO

SEGMENTS AND RELATED INFORMATION - SCHEDULE OF REVENUE FROM EXTERNAL CUSTOMERS AND LONG LIVED ASSETS, BY GEOGRAPHICAL AREAS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 183.2	$ 181.3	$ 179
Other, net	(92.7)	25.1	7
Payments for (Proceeds from) Productive Assets	94.7	92.3	99.4
Assets	15,061.4	15,060.9
Long-Lived Assets	1,178	1,184.8
United States
Segment Reporting Information [Line Items]
Long-Lived Assets	893.9	906.5
Canada
Segment Reporting Information [Line Items]
Long-Lived Assets	177.5	182.1
Other International
Segment Reporting Information [Line Items]
Long-Lived Assets	106.6	96.2
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	146.8	140	134.3
Other, net	(50.9)	82.9	(1.3)
Payments for (Proceeds from) Productive Assets	39.5	37.7	23.1
Assets	13,964	14,088.7
EES
Segment Reporting Information [Line Items]
Depreciation and amortization	46.8	43.3	42.6
Other, net	10.5	10.1	(2)
Payments for (Proceeds from) Productive Assets	4.5	10.3	9.1
Assets	4,457	4,553.6
CSS
Segment Reporting Information [Line Items]
Depreciation and amortization	71.5	71.7	68.4
Other, net	59.8	74.2	(1.3)
Payments for (Proceeds from) Productive Assets	19.2	7.9	4.8
Assets	6,009.5	5,626.6
UBS
Segment Reporting Information [Line Items]
Depreciation and amortization	28.5	25	23.3
Other, net	(121.2)	(1.4)	2
Payments for (Proceeds from) Productive Assets	15.8	19.5	9.2
Assets	3,497.5	3,908.5
Corporate Segment
Segment Reporting Information [Line Items]
Depreciation and amortization	36.4	41.3	44.7
Other, net	41.8	57.8	(8.3)
Payments for (Proceeds from) Productive Assets	55.2	54.6	$ 76.4
Assets	$ 1,097.4	$ 972.2

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) - USD ($) $ in Millions	Jan. 02, 2025	Dec. 05, 2024
Ascent
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross		$ 186.8
Subsequent Event | ISS
Subsequent Event [Line Items]
Business Acquisition, Date of Acquisition Agreement	Jan. 02, 2025
Payments to Acquire Businesses, Gross	$ 36.3

Schedule II - Valuation and Q_3

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 55	$ 55.9	$ 46.5	$ 41.7
Valuation Allowances and Reserves, Charged to Cost and Expense	18.7	18.6	18
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(19.6)	(9.2)	(13.2)
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	32.6	23.5	33.7	$ 46.3
Valuation Allowances and Reserves, Charged to Cost and Expense	10.3	7.7	5.8
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	$ (1.2)	$ (17.9)	$ (18.4)