Graybar Electric (GRAYBAR) 10-K 12 Mar 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 01, 2020	Jun. 30, 2019
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	000-00255
Entity Registrant Name	GRAYBAR ELECTRIC COMPANY, INC.
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	13-0794380
Entity Address, Address Line One	34 North Meramec Avenue
Entity Address, City or Town	St. Louis
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63105
City Area Code	314
Local Phone Number	573 - 9200
Title of 12(g) Security	Common Stock - Par Value $1.00 Per Share with a
No Trading Symbol Flag	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		22,689,848
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000205402

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales		$ 7,523.9	$ 7,202.5	$ 6,631.2
Cost of merchandise sold		(6,094.9)	(5,821.6)	(5,369.9)
Gross Margin		1,429	1,380.9	1,261.3
Selling, general and administrative expenses		(1,159.9)	(1,125)	(1,026.6)
Depreciation and amortization		(50.5)	(49.6)	(48.9)
Other income, net		5	3.4	6.5
Income from Operations		223.6	209.7	192.3
Non-operating expenses		(23.7)	(30.6)	(24.8)
Income before Provision for Income Taxes		199.9	179.1	167.5
Provision for income taxes		(55)	(35.4)	(95.6)
Net Income		144.9	143.7	71.9
Net income attributable to noncontrolling interests		(0.4)	(0.4)	(0.3)
Net Income attributable to Graybar Electric Company, Inc.		$ 144.5	$ 143.3	$ 71.6
Net Income attributable to Graybar Electric Company, Inc. per share of Common Stock (usd per share)	[1]	$ 6.41	$ 6.37	$ 3.20
Average common shares outstanding			21.4	21.3
[1]	Adjusted for the declaration of a 5 % stock dividend in December 2019, shares related to which were issued in February 2020. Prior to the adjustment, the average common shares outstanding were 21.4 million shares and 21.3 million shares for the years ended December 31, 2018 and 2017, respectively.

Consolidated Statements Of In_2

Consolidated Statements Of Income (Parenthetical) - shares shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement Parenthetical [Abstract]
Stock dividend	5.00%	10.00%	10.00%
Average common shares outstanding		21.4	21.3

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 144.9	$ 143.7	$ 71.9
Other Comprehensive Income
Foreign currency translation	4.8	(8.1)	5.9
Pension and postretirement benefits liability adjustment (net of tax of $5.2, $(6.1), and $10.0, respectively)	(15)	17.6	(15.7)
Total Other Comprehensive Income (Loss)	(10.2)	9.5	(9.8)
Comprehensive Income	134.7	153.2	62.1
Less: comprehensive income attributable to noncontrolling interests, net of tax	0.5	0.1	0.5
Comprehensive Income attributable to Graybar Electric Company, Inc.	$ 134.2	$ 153.1	$ 61.6

Consolidated Statements Of Co_2

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Pension and postretirement benefits liability adjustment (tax)	$ 5.2	$ (6.1)	$ 10

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 60.8	$ 58.9
Trade receivables (less allowances of $6.2 and $5.9, respectively)	1,096.6	1,187
Merchandise inventory	654.2	658.7
Other current assets	51.7	54.1
Total Current Assets	1,863.3	1,958.7
Property, at cost
Land	79.6	79.4
Buildings	505.5	489.2
Furniture and fixtures	250.4	233
Software	168.6	166.4
Finance leases	18.3	21.3
Total Property, at cost	1,022.4	989.3
Less – accumulated depreciation and amortization	(597.2)	(565.4)
Net Property	425.2	423.9
Operating Lease Right-of-use Assets	117.5
Other Non-current Assets	111.7	108.6
Total Assets	2,517.7	2,491.2
Current Liabilities
Short-term borrowings	138	235
Current portion of long-term debt	3.8	3.4
Trade accounts payable	832.3	895.2
Accrued payroll and benefit costs	151.1	158.2
Other accrued taxes	24.7	23.9
Current operating lease liabilities	28.6
Other current liabilities	101.1	101
Total Current Liabilities	1,279.6	1,416.7
Postretirement Benefits Liability	69.4	66.7
Pension Liability	164.6	118.6
Long-term Debt	7.8	10
Non-current Operating Lease Liabilities	96.2
Other Non-current Liabilities	2.3	8.7
Total Liabilities	1,619.9	1,620.7
SHAREHOLDERS’ EQUITY
Outstanding Common Stock	449.5	428.8
Common shares subscribed	19.9	19.2
Less subscriptions receivable	(19.9)	(19.2)
Retained Earnings	694	678.1
Accumulated Other Comprehensive Loss	(250.6)	(240.3)
Total Graybar Electric Company, Inc. Shareholders’ Equity	892.9	866.6
Noncontrolling Interests	4.9	3.9
Total Shareholders’ Equity	897.8	870.5
Total Liabilities and Shareholders’ Equity	$ 2,517.7	$ 2,491.2

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 6.2	$ 5.9
Common stock stated value per share (USD per share)	$ 20	$ 20
Authorized	50,000,000	50,000,000
Issued to voting trustees	18,665,064	17,754,923
Issued to shareholders	3,872,159	3,744,318
In treasury, at cost	(62,700)	(58,172)
Outstanding Common Stock	22,474,523	21,441,069
Common shares subscribed	997,275	958,439
Less subscripton receivable	(997,275)	(958,439)

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net Income	$ 144.9	$ 143.7	$ 71.9
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	50.5	49.6	48.9
Non-cash operating lease expense	30.1
Deferred income taxes	(3.7)	3.4	14.2
Net gains on disposal of assets	(1.5)		(0.1)
Losses on impairment of assets	0.3	0.3
Net income attributable to noncontrolling interests	(0.4)	(0.4)	(0.3)
Changes in assets and liabilities, net of acquisitions:
Trade receivables	92.2	(125.4)	(97.5)
Merchandise inventory	4.5	(101.9)	(63.8)
Other current assets	2.4	2.1	(10.9)
Other non-current assets	(1.7)	(9)	(0.5)
Trade accounts payable	(62.8)	59.7	83.3
Accrued payroll and benefit costs	(7.1)	38.8	(2.1)
Other current liabilities	5.8	5.6	13.3
Other non-current liabilities	(4.1)	(24.4)	(11.3)
Total adjustments to net income	104.5	(101.6)	(26.8)
Net cash provided by operating activities	249.4	42.1	45.1
Cash Flows from Investing Activities
Proceeds from disposal of assets	3.7	0.7	2.2
Capital expenditures for property	(43.1)	(43)	(41.3)
Net cash used by investing activities	(39.4)	(42.3)	(39.1)
Cash Flows from Financing Activities
Net (decrease) increase in short-term borrowings	(97)	65.4	29.1
Principal payments under finance arrangements	(3.7)	(4)	(4.2)
Sales of common stock	18.5	17.8	17.4
Purchases of common stock	(19.2)	(15.7)	(13.7)
Sales of noncontrolling interests’ common stock	0.8		0.6
Purchases of noncontrolling interests’ common stock	(0.3)	(0.3)	(0.3)
Dividends paid	(107.2)	(46.9)	(35.4)
Net cash provided (used) by financing activities	(208.1)	16.3	(6.5)
Net Increase (Decrease) in Cash	1.9	16.1	(0.5)
Cash, Beginning of Year	58.9	42.8	43.3
Cash, End of Year	60.8	58.9	42.8
Non-cash Investing and Financing Activities:
Acquisitions of equipment under capital leases	2	3.1	1.9
Acquisitions of assets under operating leases	55.9
Acquisition of software and maintenance under financing arrangement		5
Cash Paid During the Year for:
Interest, net of amounts capitalized	6.1	6.3	4.2
Income taxes, net of refunds	$ 60.7	$ 38.3	$ 78.4

Consolidated Statements Of Chan

Consolidated Statements Of Changes in Shareholders’ Equity - USD ($) $ in Millions	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2016	$ 348.8	$ 575.4	$ (196.6)	$ 3.3	$ 730.9
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net Income		71.6		0.3	71.9
Other comprehensive (loss) income			(10)	0.2	(9.8)
Stock issued	17.4			0.6	18
Stock purchased	(13.7)			(0.3)	(14)
Dividends declared	35.2
Dividends declared		(70.6)			(35.4)
Balance at Dec. 31, 2017	387.7	619.9	(250.1)	4.1	761.6
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Adoption of ASU 2018-02		43.5	(43.5)
Net Income		143.3		0.4	143.7
Other comprehensive (loss) income			9.8	(0.3)	9.5
Stock issued	17.8				17.8
Stock purchased	(15.7)			(0.3)	(16)
Dividends declared	39
Dividends declared		(85.9)			(46.9)
Balance at Dec. 31, 2018	428.8	678.1	(240.3)	3.9	870.5
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Adoption of ASU 2018-02		0.8			0.8
Net Income		144.5		0.4	144.9
Other comprehensive (loss) income			(10.3)	0.1	(10.2)
Stock issued	18.5			0.8	19.3
Stock purchased	(19.2)			(0.3)	(19.5)
Dividends declared	21.4
Dividends declared		(128.6)			(107.2)
Balance at Dec. 31, 2019	$ 449.5	$ 694	$ (250.6)	$ 4.9	$ 897.8

Description Of The Business

Description Of The Business	12 Months Ended
	Dec. 31, 2019
Description Of The Business [Abstract]
Description Of The Business	1. DESCRIPTION OF THE BUSINESS Graybar Electric Company, Inc. (“Graybar”, “Company”, "we", "our", or "us") is a New York corporation, incorporated in 1925. We are engaged in the distribution of electrical and communications and data networking products and are a provider of related supply chain management and logistics services. We primarily serve customers in the construction, commercial, institutional and government ("CIG"), and industrial & utility vertical markets, with products and services that support new construction, infrastructure updates, building renovation, facility maintenance, repair and operations ("MRO"), and original equipment manufacturers ("OEM"). We purchase all of the products we sell from others, and we neither manufacture nor contract to manufacture any products we sell. Our business activity is primarily based in the United States (“U.S.”). We also have subsidiary operations with distribution facilities in Canada and Puerto Rico.

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Our accounting policies conform to generally accepted accounting principles in the U.S. ("GAAP”) and are applied on a consistent basis among all years presented. Significant accounting policies are described below. Principles of Consolidation The consolidated financial statements include the accounts of Graybar and its subsidiary companies. All material intercompany balances and transactions have been eliminated. The ownership interests that are held by owners other than the Company in subsidiaries consolidated by the Company are accounted for and reported as noncontrolling interests. Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results could differ from these estimates. Subsequent Events We have evaluated subsequent events through the time of the filing of this Annual Report on Form 10-K with the Commission. No material subsequent events have occurred since December 31, 2019 that require recognition or disclosure in our financial statements. Revenue Recognition Sales revenue is recognized when performance obligations are satisfied, which is typically upon delivery of the product to the customer. Sometimes product is purchased from the manufacturer and drop-shipped to the customer. We generally take control of the goods when shipped by the manufacturer and then recognize revenue when control of the product transfers to the customer. Revenues recognized are primarily for product sales, but may also include freight and handling charges. Our standard warehouse shipping terms are FOB shipping point, under which control passes to the customer at the time of shipment. We also earn revenue for professional services, general contracting services, and storage services. Such service revenue represented less than 1 % of gross sales for the years ended December 31, 2019, 2018, and 2017. Revenue is reported net of all taxes, primarily sales tax, assessed by governmental authorities as a result of revenue-producing transactions. Outgoing Freight Expenses We record 95 % of outgoing freight expenses as a component of selling, general and administrative expenses. Total outgoing freight expenses were $ 68.5 million, $ 65.7 million, and $ 57.7 million for the years ended December 31, 2019, 2018, and 2017, respectively. Cash and Cash Equivalents We account for cash on hand, deposits in banks, and other short-term, highly liquid investments with an original maturity of three months or less as cash and cash equivalents. Allowance for Doubtful Accounts We perform ongoing credit evaluations of our customers, and a significant portion of our trade receivables is secured by mechanic’s lien or payment bond rights. We maintain allowances to reflect the expected uncollectability of trade receivables based on past collection history and specific risks identified in the receivables portfolio. Although actual credit losses have historically been within management’s expectations, additional allowances may be required if the financial condition of our customers were to deteriorate. Merchandise Inventory Our inventory is stated at the lower of cost (generally determined using the last-in, first-out (“LIFO”) cost method) or market. LIFO accounting is a method of accounting that, compared with other inventory accounting methods, generally provides better matching of current costs with current sales. We make provisions for obsolete or excess inventories as necessary to reflect reductions in inventory value. Vendor Allowances Our agreements with many of our suppliers provide for us to earn volume incentives based on purchases during the agreement period. Based on the provisions of our vendor agreements, we develop vendor accrual rates by estimating our performance under the agreements and the amounts that will be earned. We perform analyses and review historical trends to ensure the deferred amounts earned are appropriately recorded. Certain vendor agreements contain purchase volume incentives that provide for increased funding when graduated purchase volumes are met. Amounts accrued throughout the year are based on estimates of future activity levels, and could be materially impacted if actual purchase volumes differ. Changes in the estimated amount of incentives are treated as changes in estimate and are recognized in earnings in the period in which the change in estimate occurs. In the event that the operating performance of our suppliers were to decline, however, there can be no assurance that amounts earned would be paid or that the volume incentives would continue to be included in future agreements. Property and Depreciation Property, plant and equipment are recorded at cost. Depreciation is expensed on a straight-line basis over the estimated useful lives of the related assets. Interest costs incurred to finance expenditures for major long-term construction projects are capitalized as part of the asset's historical cost and included in property, plant and equipment, then depreciated over the useful life of the asset. Leasehold improvements are amortized over the term of the lease or the estimated useful life of the improvement, whichever is shorter. Expenditures for maintenance and repairs are charged to expense when incurred, while the costs of significant improvements, which extend the useful life of the underlying asset, are capitalized. Credit Risk Financial instruments that potentially expose us to concentrations of credit risk consist primarily of trade receivables. We perform ongoing credit evaluations of our customers, and a significant portion of our trade receivables are secured by mechanic’s lien or payment bond rights. We maintain allowances for potential credit losses, and such losses historically have been within management’s expectations. Fair Value We endeavor to utilize the best available information in measuring fair value. GAAP has established a fair value hierarchy, which prioritizes the inputs used in measuring fair value. The tiers in the hierarchy include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own data inputs and assumptions. We have used fair value measurements to value our pension plan assets. Foreign Currency Exchange Rate The functional currency for our Canadian subsidiary is the Canadian dollar. Accordingly, its balance sheet amounts are translated at the exchange rates in effect at the end of each reporting period and its statements of income amounts are translated at the average rates of exchange prevailing during the current period. Currency translation adjustments are included in accumulated other comprehensive loss. Goodwill Our goodwill is not amortized, but rather tested annually for impairment. Goodwill is reviewed annually in the fourth quarter and when circumstances or other events might indicate that impairment may have occurred. We first perform a qualitative assessment of goodwill impairment. The qualitative assessment considers several factors including the excess fair value over carrying value as of the last quantitative impairment test, the length of time since the last fair value measurement, the current carrying value, market conditions, actual performance compared to forecasted performance, and the current business outlook. If the qualitative assessment indicates that it is more likely than not that goodwill is impaired, the reporting unit is then quantitatively tested for impairment. If a quantitative assessment is required, the fair value is determined using a variety of assumptions including estimated future cash flows of the reporting unit using applicable discount rates. Definite Lived Intangible Assets The cost of intangible assets with determinable useful lives is amortized to reflect the pattern of economic benefits consumed, either on a straight-line or accelerated basis over the estimated periods benefited. Customer relationships, trade names and other non-contractual intangible assets with determinable lives are amortized over periods generally ranging from 3 to 20 years. Intangible assets are tested for impairment if events or circumstances occur indicating that the respective asset might be impaired. Income Taxes We recognize deferred tax assets and liabilities to reflect the future tax consequences of events that have been recognized in the financial statements or tax returns. A deferred tax asset or liability results from the temporary difference between an item’s carrying value as reflected in the financial statements and its tax basis, and is calculated using enacted applicable tax rates. We assess the likelihood that our deferred tax assets will be recovered from future taxable income and, to the extent we believe that recovery is not likely, a valuation allowance is established. Changes in the valuation allowance, when recorded, are included in the provision for income taxes in the consolidated financial statements. We classify interest expense and penalties as part of our provision for income taxes based upon applicable federal and state interest/underpayment percentages. We assess uncertainty regarding tax positions taken in previously filed returns and record reserves in accordance with the guidance under Accounting Standards Codification ("ASC") 740-10, "Accounting for Uncertainty in Income Taxes". Other Postretirement Benefits We account for postretirement benefits other than pension benefits by accruing the costs of benefits to be provided over the eligible employees’ periods of active service. These costs are determined on an actuarial basis. Our consolidated balance sheets reflect the funded status of postretirement benefits. Pension Plan We sponsor a noncontributory defined benefit pension plan accounted for by accruing the cost to provide the benefits over the eligible employees’ periods of active service. These costs are determined on an actuarial basis. Our consolidated balance sheets reflect the funded status of the defined benefit pension plan. Leases We determine if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, current operating lease liabilities, and non-current operating lease liabilities on our consolidated balance sheets. Amounts related to finance leases are included in property and equipment, current portion of long-term debt, and long-term debt on our consolidated balance sheets. ROU assets and lease liabilities are recognized and measured on the date the underlying asset is made available to us. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. We use our incremental borrowing rate based on the information available at the commencement date in determining the present value of future payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Operating lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. For certain leases, such as real estate and information technology (IT) equipment, we account for the lease and non-lease components as a single lease component. For all other leases, we account for the lease and non-lease components separately. We have elected as an accounting policy not to apply the recognition requirements for short-term leases. Therefore, leases with a term of twelve months or less are not recorded on the consolidated balance sheets. Lease expenses associated with short-term leases are immaterial and are recorded in the consolidated statements of income in selling, general and administrative expenses. Additionally, for certain vehicle leases, we apply a portfolio approach to account for the operating lease ROU assets and liabilities. Non-Operating Expenses Non-operating expenses are comprised of interest expense, net and non-service cost components of the net periodic benefit cost for the pension and other postretirement benefit plans. The non-service cost components include interest cost, expected return on plan assets, amortization of net actuarial gains/losses, and amortization of prior service costs/gains. New Accounting Standards No new accounting standards that were issued or became effective during 2019 have had or are expected to have a material impact on our consolidated financial statements, except those noted below. We adopted the Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU" or "Update") 2017-07, "Compensation - Retirement Benefits (Topic 715)" ("ASU 2017-07") on January 1, 2018 using the retrospective transition method. The updates to the standard require us to report the service cost component in the same line as other compensation costs arising from services rendered by employees during the reporting period. The other components of net benefit costs are presented in the income statement separately from the service cost and outside of a subtotal of income from operations. As a result of the adoption, the financial statement line previously entitled "interest expense, net" was changed to "non-operating expenses". The impact to the operating results for the year ended December 31, 2017 within the consolidated statements of income as a result of adopting ASU 2017-07 is presented in the tables below: Consolidated Statements of Income Year Ended December 31, 2017 As Reported Reclassification As Adjusted Selling, general and administrative expenses $ 1,047.2 $ ( 20.6 ) $ 1,026.6 Non-operating expenses 4.2 20.6 24.8 On January 1, 2018, we adopted ASC Topic 606, "Revenue from Contracts with Customers." See Note 3, "Revenue", for further information. On January 1, 2019, we adopted ASU 2016-02, “Leases (Topic 842)” ("ASU 2016-02"). See Note 7, “Leases”, for further information. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments", which introduces new guidance for the accounting for credit losses on certain financial instruments. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. We have determined that our trade receivables are financial instruments subject to this Update. We have evaluated the accounting policies applicable to our allowance for doubtful accounts and have developed new methods to include three components into our allowance to comply with requirements of the ASU: 1) a reserve derived from historical loss rates based upon the aging of our trade receivables, 2) a reserve based upon specifically-identified trade receivables in our portfolio that are considered higher risk based on current conditions, and 3) an additional reserve, as necessary, to consider the impact of future economic conditions. We currently believe that the adoption of this Update will not have a material impact on our consolidated financial statements and will adopt this Update beginning on January 1, 2020. In August 2018, the FASB issued ASU 2018-13, "Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement" ("ASU 2018-13") that makes minor changes to the disclosure requirements on fair value measurements in Topic 820. The guidance eliminates requirements for certain disclosures that are no longer considered cost beneficial and adds new disclosure requirements that the FASB considers pertinent. ASU 2018-13 is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The adoption of this Update will not have a material impact on our consolidated financial statements. We will adopt this Update beginning on January 1, 2020. In August 2018, the FASB issued ASU 2018-14, "Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans" ("ASU 2018-14") that makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. The guidance eliminates requirements for certain disclosures that are no longer considered cost beneficial and adds new disclosure requirements that the FASB considers pertinent. ASU 2018-14 is effective for fiscal years ending after December 15, 2020 for public entities. Early adoption is permitted. We are currently evaluating the impact of the adoption of the Update on our consolidated financial statements, but do not expect it to have a material impact. We plan to adopt this Update beginning on January 1, 2021. In August 2018, the FASB issued ASU 2018-15, "Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" ("ASU 2018-15") requiring a customer in a cloud computing arrangement that is a service contract to follow the internal use software guidance in ASC 350-40 to determine which implementation costs to capitalize as assets. Capitalized implementation costs related to a hosting arrangement that is a service contract will be amortized over the term of the hosting arrangement, beginning when the module or component of the hosting arrangement is ready for its intended use. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years for public entities. Early adoption is permitted. The adoption of this Update will not have a material impact on our consolidated financial statements. We will adopt this Update beginning on January 1, 2020.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2019
Revenue [Abstract]
Revenue	3. REVENUE On January 1, 2018, we adopted ASC Topic 606, “Revenue from Contracts with Customers” ("ASC Topic 606") using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under ASC Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting under ASC Topic 605, "Revenue Recognition" ("ASC Topic 605"). We recorded an increase to opening retained earnings of $ 0.8 million (net of tax of $ 0.3 million) as of January 1, 2018 due to the cumulative impact of adopting ASC Topic 606, with the impact primarily related to the recognition of bill and hold transactions that were deferred under ASC Topic 605. The impact to net sales as a result of applying ASC Topic 606 for the year ended December 31, 2018 was an increase of $ 0.2 million. In accordance with the new revenue standard requirement, the disclosure impact of adoption on our consolidated statement of income for the year ended December 31, 2018 and the consolidated balance sheet as of December 31, 2018 was as follows: Consolidated Statements of Income For the Year Ended December 31, 2018 As Reported Balance without Adoption Effect of Change Net sales $ 7,202.5 $ 7,202.3 $ 0.2 Cost of merchandise sold 5,821.6 5,821.6 — Consolidated Balance Sheet As of December 31, 2018 As Reported Balance without Adoption Effect of Change Merchandise inventory $ 658.7 $ 668.2 $ ( 9.5 ) Other current assets 54.1 54.4 ( 0.3 ) Other non-current liabilities 8.7 19.4 ( 10.7 ) Retained earnings 678.1 677.2 0.9 The following table summarizes the percentages of our net sales attributable to each of our vertical markets for the years ended December 31, 2019, 2018, and 2017: For the Years Ended December 31, 2019 2018 2017 Construction 60.1 % 59.7 % 58.7 % CIG 20.6 20.8 21.1 Industrial & Utility 19.3 19.5 20.2 Total net sales 100.0 % 100.0 % 100.0 % Certain reclassifications have been made to the vertical market assigned to customers in the prior years’ information to conform to the December 31, 2019 presentation. We had no material contract assets, contract liabilities, or deferred contract costs recorded on the consolidated balance sheet as of December 31, 2019 and 2018. In addition, for the years ended December 31, 2019, 2018, and 2017, revenue recognized in the reporting period that was included in the contract liability balance at the beginning of the period is not material. Revenue expected to be recognized in any future year related to remaining performance obligations is not material. As permitted in ASC Topic 606, we have elected to omit disclosure related to performance obligations for revenue pertaining to contracts that have an original expected duration of one year or less, to contracts where revenue is recognized as invoiced and to contracts with variable consideration related to wholly unsatisfied performance obligations.

Cash Discounts And Doubtful Acc

Cash Discounts And Doubtful Accounts	12 Months Ended
	Dec. 31, 2019
Cash Discounts And Doubtful Accounts [Abstract]
Cash Discounts And Doubtful Accounts	4. CASH DISCOUNTS AND DOUBTFUL ACCOUNTS The following table summarizes the activity in the allowances for cash discounts and doubtful accounts: Beginning Balance Provision (Charged to Expense) Deductions Ending Balance For the Year Ended December 31, 2019 Allowance for cash discounts $ 2.2 $ 35.8 $ ( 35.8 ) $ 2.2 Allowance for doubtful accounts 3.7 7.0 ( 6.7 ) 4.0 Total $ 5.9 $ 42.8 $ ( 42.5 ) $ 6.2 For the Year Ended December 31, 2018 Allowance for cash discounts $ 2.0 $ 33.2 $ ( 33.0 ) $ 2.2 Allowance for doubtful accounts 4.0 2.9 ( 3.2 ) 3.7 Total $ 6.0 $ 36.1 $ ( 36.2 ) $ 5.9 For the Year Ended December 31, 2017 Allowance for cash discounts $ 1.7 $ 31.2 $ ( 30.9 ) $ 2.0 Allowance for doubtful accounts 3.3 3.6 ( 2.9 ) 4.0 Total $ 5.0 $ 34.8 $ ( 33.8 ) $ 6.0

Inventory

Inventory	12 Months Ended
	Dec. 31, 2019
Inventory [Abstract]
Inventory	5. INVENTORY Our inventory, comprised entirely of finished goods, is stated at the lower of cost (generally determined using the LIFO cost method) or market. Inventories valued using the LIFO method comprised 90 % and 91 % of the total inventories at December 31, 2019 and 2018, respectively. Had the first-in, first-out (“FIFO”) method been used, merchandise inventory would have been $ 186.5 million and $ 188.8 million greater than reported under the LIFO method at December 31, 2019 and 2018, respectively. In 2019, 2018, and 2017 we did no t liquidate any portion of previously-created LIFO layers. Reserves for excess and obsolete inventories were $ 9.2 million and $ 7.8 million at December 31, 2019 and 2018, respectively. The change in the reserve for excess and obsolete inventories, included in cost of merchandise sold, was $ 1.4 million, $( 1.4 ) million, and $ 2.7 million for the years ended December 31, 2019, 2018, and 2017, respectively.

Property And Depreciation

Property And Depreciation	12 Months Ended
	Dec. 31, 2019
Property And Depreciation [Abstract]
Property and Depreciation	6. PROPERTY AND DEPRECIATION We provide for depreciation and amortization using the straight-line method over the following estimated useful asset lives: Classification Estimated Useful Asset Life Buildings 42 years Leasehold improvements Over the shorter of the asset’s life or the lease term Furniture, fixtures, equipment and software 3 to 14 years Assets held under finance leases Over the shorter of the asset’s life or the lease term Depreciation expense was $ 36.1 million, $ 37.3 million, and $ 38.8 million in 2019, 2018, and 2017, respectively. At the time property is retired or otherwise disposed of, the asset and related accumulated depreciation are removed from the accounts, and any resulting gain or loss is credited or charged to other income, net. Assets held under finance leases, consisting primarily of information technology equipment, are recorded in property with the corresponding obligations carried in long-term debt. The amount capitalized is the present value at the beginning of the lease term of the aggregate future minimum lease payments. Assets capitalized as finance leases during the year ended December 31, 2019 and 2018 were $ 2.0 million and $ 3.1 million, respectively. We capitalize interest expense on major construction and development projects while in progress. Interest capitalized for 2019, 2018, and 2017 was $ 0.2 million, $ 0.3 million and $ 0.1 million, respectively. Where applicable, we capitalize qualifying internal and external costs incurred to develop or obtain software for internal use during the application development stage. Costs incurred during the pre-application development and post-implementation stages are expensed as incurred. We capitalized software and software development costs of $ 3.0 million and $ 3.7 million in 2019 and 2018, respectively, and the amounts are recorded in software. We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. For assets classified as held and used, impairment may occur if projected undiscounted cash flows are not adequate to cover the carrying value of the assets. In such cases, additional analysis is conducted to determine the amount of the loss to be recognized. The impairment loss is calculated as the difference between the carrying amount of the asset and its estimated fair value. The analysis requires estimates of the amount and timing of projected cash flows and, where applicable, selection of an appropriate discount rate. Such estimates are critical in determining whether any impairment charge should be recorded and the amount of such charge if an impairment loss is deemed necessary. There were no impairment losses related to property recorded during 2019 or 2017. During 2018, we recorded an impairment loss of $ 0.3 million to account for the expected loss on an abandoned property that did not qualify as an asset held for sale, where the net book value of the property exceeded the estimated selling price less estimated selling expenses. The impairment loss is included in other income, net in the consolidated statements of income.

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	7. LEASES Effective January 1, 2019, we adopted ASC Topic 842, Leases, which requires the recording of operating lease ROU assets and operating lease liabilities. Finance leases were not materially impacted by the adoption of ASC Topic 842, as finance lease liabilities and the corresponding ROU assets were already recorded in the balance sheet under the previous guidance, ASC Topic 840. We have operating and finance leases for corporate offices, warehouse buildings, sales offices, branch locations, vehicles, and certain equipment. Our leases have remaining lease terms of one to ten years, some of which may include options to extend the leases for up to five years, and some of which may include options to terminate the leases within one year. In addition to fixed lease payments, we incur variable lease charges that are recognized as incurred. These charges are primarily for maintenance and real estate taxes on leased facilities. Leases with an initial term of 12 months or less are not recorded in the balance sheet. We elected the package of transitional practical expedients which allows an entity not to reassess whether expired or existing contracts contain leases, lease classification of expired or existing leases, and whether previously capitalized initial direct costs would qualify for capitalization under Topic 842. As guidance allows, this package can be elected separate of any other practical expedient. As a practical expedient, we elected as an accounting policy not to separate non-lease components from lease components for real estate properties and information technology agreements. We have implemented internal controls and key system functionality to enable the preparation of financial information. The standard had a material impact on our consolidated balance sheets, but did not have a material impact on our consolidated statements of income. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases, while our accounting for finance leases remains substantially unchanged. ROU assets represent our right to use an underlying asset during the lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the net present value of fixed lease payments over the lease term. The lease term includes options to extend or terminate the lease when it is reasonably certain that we will exercise that option. As most of our operating leases and finance leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Fixed operating lease expense and finance lease depreciation expense are recognized on a straight-line basis over the lease term. Adoption of ASU 2016-02 resulted in the recognition of $ 98.1 million in operating lease liabilities and $ 91.8 million of ROU assets, net of existing lease incentives and deferred rent liabilities at January 1, 2019. The components of the lease expense for the year ended December 31, 2019 were as follows: Year Ended December 31, 2019 Operating lease cost $ 33.9 Finance lease cost: Amortization of right-of-use assets 2.2 Interest on lease liabilities 0.7 Total finance lease cost 2.9 Variable lease cost 9.5 Total lease cost $ 46.3 Supplemental balance sheet information at December 31, 2019 related to leases was as follows: December 31, 2019 Operating leases: Operating lease right-of-use assets $ 117.5 Current operating lease liabilities $ 28.6 Non-current operating lease liabilities 96.2 Total operating lease liabilities $ 124.8 Finance leases: Property, at cost $ 18.3 Less – accumulated depreciation and amortization 9.9 Net property $ 8.4 Current obligations of finance leases $ 2.1 Finance leases, net of current obligations 7.8 Total finance lease liabilities $ 9.9 Weighted average remaining lease term: Operating leases 5.0 years Finance leases 5.1 years Weighted average discount rate: Operating leases 3.3 % Finance leases 7.0 % Supplemental cash flow and other information for the year ended December 31, 2019 related to leases was as follows: Year Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 33.5 Operating cash flows from finance leases 0.7 Financing cash flows from finance leases 2.1 Right-of-use assets obtained in exchange for lease liabilities: Operating leases $ 55.9 Finance leases 2.0 Future minimum lease payments under non-cancellable leases as of December 31, 2019 were as follows: December 31, 2019 Operating Leases Finance Leases Future minimum lease payments 2020 $ 32.2 $ 2.7 2021 29.4 2.7 2022 23.6 2.1 2023 18.2 1.5 2024 13.4 1.3 Thereafter 19.0 1.7 Total future minimum lease payments $ 135.8 $ 12.0 Less: imputed interest ( 11.0 ) ( 2.1 ) Total lease obligation $ 124.8 $ 9.9 Less: current obligations ( 28.6 ) ( 2.1 ) Long-term lease obligation $ 96.2 $ 7.8

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill And Other Intangible Assets [Abstract]
Goodwill And Other Intangible Assets	8. GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill The changes in the carrying amount of goodwill, included in other non-current assets in our consolidated balance sheets, for the years ended December 31 were as follows: 2019 2018 Beginning balance $ 30.1 $ 30.1 Goodwill acquired — — Ending balance $ 30.1 $ 30.1 As of December 31, 2019, we have completed our annual impairment test and concluded that there is no impairment of our goodwill. Other Intangible Assets Other intangible assets, included in other non-current assets in our consolidated balance sheets, consist of the following: As of December 31, 2019 Weighted Average Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships 8.5 to 10.8 years $ 16.7 $ ( 6.7 ) $ 10.0 Trade name 15 to 20 years 14.3 ( 2.8 ) 11.5 Non-compete agreements 3 to 5 years 0.3 ( 0.3 ) — Other intangible assets 10 years 0.1 ( 0.1 ) — Total $ 31.4 $ ( 9.9 ) $ 21.5 As of December 31, 2018 Weighted Average Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships 8.5 to 10.8 years $ 17.1 $ ( 5.0 ) $ 12.1 Trade name 15 to 20 years 14.3 ( 2.1 ) 12.2 Non-compete agreements 3 to 5 years 0.3 ( 0.2 ) 0.1 Other intangible assets 10 years 0.2 ( 0.1 ) 0.1 Total $ 31.9 $ ( 7.4 ) $ 24.5 We incurred losses of $ 0.5 million related to our customer relationships during the year ended December 31, 2019. We did no t incur impairment losses related to our other intangible assets during the year ended December 31, 2018. Amortization expense for other intangible assets was $ 2.5 million, $ 2.6 million, and $ 2.6 million for the years ended December 31, 2019, 2018, and 2017, respectively. Estimated future amortization expense related to our intangible assets for the years ending December 31 are as follows: 2020 $ 2.4 2021 2.4 2022 2.4 2023 2.4 2024 2.4 After 2024 9.5 $ 21.5

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Taxes [Abstract]
Income Taxes	9. INCOME TAXES We determine our deferred tax assets and liabilities based upon the difference between the financial statement and tax bases of our assets and liabilities calculated using enacted applicable tax rates. We then assess the likelihood that our deferred tax assets will be recovered from future taxable income and, to the extent we believe that recovery is not likely, we establish a valuation allowance. Changes in the valuation allowance, when recorded, are included in the provision for income taxes in the consolidated financial statements. The components of income before taxes and the provision for income taxes recorded in the consolidated statements of income are as follows: For the Years Ended December 31, Components of Income before Taxes 2019 2018 2017 Domestic $ 185.1 $ 163.3 $ 155.2 Foreign 14.8 15.8 12.3 Income before taxes $ 199.9 $ 179.1 $ 167.5 For the Years Ended December 31, Components of Income Tax Provision 2019 2018 2017 Current expense U.S. Federal $ 41.9 $ 20.5 $ 66.5 State 12.4 6.9 11.4 Foreign 4.4 4.6 3.5 Total current expense $ 58.7 $ 32.0 $ 81.4 Deferred (benefit) expense U.S. Federal ( 3.0 ) 2.5 15.3 State ( 0.8 ) 0.8 ( 1.1 ) Foreign 0.1 0.1 — Total deferred (benefit) expense $ ( 3.7 ) $ 3.4 $ 14.2 Total income tax provision $ 55.0 $ 35.4 $ 95.6 A reconciliation between the statutory U.S. federal income tax rate and the effective tax rate in the consolidated statements of income is as follows: For the Years Ended December 31, 2019 2018 2017 Statutory U.S. federal income tax rate 21.0 % 21.0 % 35.0 % State and local income taxes, net of federal benefit 4.5 3.1 4.0 Deemed repatriation of foreign earnings — ( 1.0 ) 3.3 Effect of tax rate changes — ( 5.1 ) 13.5 Meals and entertainment 1.4 1.4 1.4 Other, net 0.6 0.4 ( 0.1 ) Effective tax rate 27.5 % 19.8 % 57.1 % The effective tax rate increased in 2019 and reflects a normalization after the one-time effects of the TCJA were recorded in the 2018 and 2017 results. Deferred income taxes are provided based upon differences between the financial statement and tax bases of assets and liabilities. The following deferred tax assets (liabilities) were recorded at December 31: Assets (Liabilities) 2019 2018 Pension $ 38.7 $ 31.0 Operating lease liabilities 30.6 — Postretirement benefits 19.6 18.6 Inventory 14.9 12.1 Other deferred tax assets 5.0 5.0 Payroll accruals 2.9 2.9 Bad debt reserves 1.0 1.0 Subtotal 112.7 70.6 Less: valuation allowances ( 0.4 ) — Deferred tax assets 112.3 70.6 Fixed assets ( 32.2 ) ( 28.3 ) Operating lease right-of-use assets ( 28.7 ) — Other deferred tax liabilities ( 4.5 ) ( 4.0 ) Computer software ( 2.9 ) ( 3.2 ) Deferred tax liabilities ( 68.3 ) ( 35.5 ) Net deferred tax assets $ 44.0 $ 35.1 Deferred income taxes included in non-current assets (liabilities) at December 31 were: 2019 2018 Deferred tax assets included in other non-current assets $ 44.5 $ 35.5 Deferred tax liabilities included in other non-current liabilities ( 0.5 ) ( 0.4 ) Operating loss and tax credit carryforwards included in net deferred tax assets at December 31 were: 2019 2018 U.S. Federal (A) $ 0.4 $ — State (A) 0.3 0.4 Foreign (B) 0.1 0.1 (A) Expires between 2023 and 2030 (B) Indefinite life We have placed a partial valuation allowance on certain state net operating losses of less than $ 0.1 million and a full valuation allowance on U.S. federal tax credits of $ 0.4 million that are not expected to be utilized prior to expiration. We have no material undistributed earnings of non-U.S. subsidiaries as of December 31, 2019, due to the one-time transition tax and global intangible low-taxed income (“GILTI”) provisions enacted under the TCJA. We have settled the entire transition tax liability with the filing of the 2017 federal income tax return. No additional income taxes have been provided for any outside basis difference inherent in these foreign entities, as these amounts continue to be indefinitely reinvested in foreign operations. We have made an accounting policy election to treat GILTI as a period cost as it did not have a material impact on our tax provision. Our federal income tax returns for the tax years 2016 and forward are available for examination by the United States Internal Revenue Service (“IRS”). The statute of limitation for the 2016 federal return will expire on October 15, 2020, unless extended by consent. Our state income tax returns for 2015 through 2019 remain subject to examination by various state authorities with the latest period closing on December 31, 2024. We have not extended the statutes of limitations in any state jurisdictions with respect to years prior to 2015. The Tax Cuts and Jobs Act ("TCJA") was enacted on December 22, 2017. Among the provisions, the TCJA reduced the U.S. federal corporate income tax rate from a maximum of 35 % to a flat 21 % effective January 1, 2018, required companies to pay a one-time transition tax on deemed repatriated earnings of certain foreign subsidiaries that were previously tax deferred, and created new taxes on certain foreign sourced earnings. As of December 31, 2018, we completed our accounting for the tax effects of the enactment of the TCJA and finalized the tax effects on our existing deferred tax balances and the one-time transition tax under Staff Accounting Bulletin No. 118 ("SAB 118"). No further updates with respect to these TCJA provisions have been made in 2019. At December 31, 2017, we remeasured domestic deferred tax assets and liabilities based on the expected future applicable tax rate and recorded a provisional tax expense of $ 22.6 million, consisting of $ 43.5 million of tax expense related to items previously recorded through accumulated other comprehensive income under FASB Statement No. 158, "Employers' Accounting for Defined Benefit Pension and Other Postretirement Plans - An Amendment of FASB Statements No. 87, 88, 106, and 132(R)" ("FAS 158"), and $ 20.9 million of tax benefit related to items previously recorded through our provision for income taxes. During 2018, we finalized calculations of cumulative timing differences, resulting in a decrease in tax expense of $ 9.2 million due to the return vs. provision difference remeasurement of these balances related to tax planning initiatives as of December 31, 2018. The one-time transition tax is based on our total post-1986 earnings and profits ("E&P") that we previously deferred from U.S. income taxation, and the amount of those earnings held in cash and other specified assets. At December 31, 2017, we recorded a provisional amount for our one-time transition tax liability of $ 6.2 million. We finalized our calculation as of December 31, 2018, resulting in a decrease in income tax expense of $ 2.4 million. The entire transition tax liability was settled with the filing of the 2017 U.S. federal income tax return in 2018. Our unrecognized tax benefits of $ 1.9 million, $ 2.6 million, and $ 2.3 million as of December 31, 2019, 2018, and 2017, respectively, are uncertain tax positions that would impact our effective tax rate if recognized. We are periodically engaged in tax return examinations, reviews of statute of limitations periods, and settlements surrounding income taxes. We do not anticipate a material change in unrecognized tax benefits during the next twelve months. Our uncertain tax benefits, and changes thereto, during 2019, 2018, and 2017 were as follows: 2019 2018 2017 Balance at January 1, $ 2.6 $ 2.3 $ 1.8 Additions based on tax positions related to current year 0.2 1.1 0.4 Additions based on tax positions of prior years — — 0.3 Reductions for tax positions of prior years ( 0.1 ) ( 0.8 ) ( 0.2 ) Settlements ( 0.8 ) — — Balance at December 31, $ 1.9 $ 2.6 $ 2.3 We classify interest expense and penalties as part of our provision for income taxes based upon applicable federal and state interest/underpayment percentages. We have accrued $ 0.4 million in interest and penalties at December 31, 2019 and 2018. Interest was computed on the difference between the provision for income taxes recognized in accordance with GAAP and the amount of benefit previously taken or expected to be taken in our federal, state, and local income tax returns.

Capital Stock

Capital Stock	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Capital Stock	10. CAPITAL STOCK Our common stock is 100 % owned by active and retired employees, and there is no public trading market for our common stock. Since 1928, substantially all of the issued and outstanding shares of common stock have been held of record by voting trustees under successive voting trust agreements. Under applicable New York law, a voting trust may not have a term greater than ten years. A new Voting Trust Agreement was established effective March 3, 2017, which expires by its terms on March 1, 2027. At December 31, 2019, approximately 83 % of our outstanding common stock was held in the voting trust. The participation of shareholders in the voting trust is voluntary at the time the voting trust is created, but is irrevocable during its term. Shareholders who elect not to participate in the voting trust hold their common stock as shareholders of record. Shareholders may elect to participate in the voting trust at any time during the term of the voting trust. No holder of our common stock or voting trust interests representing our common stock ("common stock", "common shares", or "shares") may sell, transfer or otherwise dispose of any shares without first offering us the option to purchase those shares at the price at which they were issued. We also have the option to purchase at the issue price the common shares of any shareholder who ceases to be an employee for any reason other than death or "retirement" (as defined in our amended restated certificate of incorporation), and on the first anniversary of any holder's death. In the past, we have always exercised these purchase options and we expect to continue to do so in the foreseeable future. However, we can make no assurance that we will continue to exercise our purchase option in the future. All outstanding shares have been issued at $ 20.00 per share. During 2019, eligible employees and qualified retirees subscribed for 997,275 shares totaling $ 19.9 million. Subscribers elected to make payments under one of the following options: (i) all shares subscribed for on or before January 3, 2020; or (ii) all shares subscribed for in installments paid through payroll deductions (or in certain cases where a subscriber is no longer on our payroll, through direct monthly payments) over an eleven-month period. Common shares were delivered to subscribers as of January 3, 2020, in the case of shares paid for prior to January 3, 2020. Shares will be issued and delivered to subscribers on a quarterly basis, as of the tenth day of March, June, September, and December, to the extent full payments for shares are made in the case of subscriptions under the installment method. Shown below is a summary of shares purchased and retired by the Company during the three years ended December 31: Shares of Common Stock Purchased Retired 2019 962,023 957,495 2018 786,754 752,825 2017 684,347 678,958 We also have authorized 10,000,000 shares of Delegated Authority Preferred Stock (“preferred stock”), par value one cent ($ 0.01 ). The preferred stock may be issued in one or more series, with the designations, relative rights, preferences, and limitations of shares of each such series being fixed by a resolution of our Board of Directors. There were no shares of preferred stock outstanding at December 31, 2019 and 2018. On December 12, 2019, our Board of Directors declared a 5 % common stock dividend. Each shareholder was entitled to one share of common stock for every twenty shares held as of December 16, 2019. The stock was issued on February 7, 2020. On December 13, 2018, our Board of Directors declared a 10 % common stock dividend. Each shareholder was entitled to one share of common stock for every ten shares held as of December 17, 2018. The stock was issued on February 1, 2019. On December 13, 2017, our Board of Directors, declared a 10 % common stock dividend. Each shareholder was entitled to one share of common stock for every ten shares held as of December 18, 2017. The stock was issued on February 2, 2018.

Net Income Per Share Of Common

Net Income Per Share Of Common Stock	12 Months Ended
	Dec. 31, 2019
Net Income Per Share Of Common Stock [Abstract]
Net Income Per Share Of Common Stock	11. NET INCOME PER SHARE OF COMMON STOCK The computation of net income per share of common stock is based on the average number of common shares outstanding during each year, adjusted in all periods presented for the declaration of a 5 % stock dividend declared in 2019, a 10 % stock dividend declared in 2018, and a 10 % stock dividend declared in 2017. The average number of shares used in computing net income per share of common stock at December 31, 2019, 2018, and 2017 was 22,555,240 shares, 22,507,701 shares, and 22,368,941 shares, respectively.

Debt

Debt	12 Months Ended
	Dec. 31, 2019
Debt [Abstract]
Debt	12. DEBT December 31, Long-term Debt 2019 2018 Finance arrangements, various maturities, with a weighted average interest rate of 6.62 % $ 11.6 $ 13.4 Less current portion ( 3.8 ) ( 3.4 ) Long-term Debt $ 7.8 $ 10.0 Long-term Debt matures as follows: 2020 $ 3.8 2021 2.3 2022 1.7 2023 1.2 2024 1.1 After 2024 1.5 $ 11.6 The carrying amount of our outstanding long-term, fixed-rate debt exceeded its fair value by $ 1.4 million and $ 1.5 million at December 31, 2019 and 2018, respectively. The fair value of the long-term, fixed-rate debt is estimated by calculating future cash flows at interpolated Treasury yields with similar maturities, plus an estimate of our credit risk spread. The fair value of our variable-rate short- and long-term debt approximates its carrying value at December 31, 2019 and 2018, respectively. Revolving Credit Facility At December 31, 2019 and 2018, we, along with Graybar Canada Limited, our Canadian operating subsidiary (“Graybar Canada”), had an unsecured, 5 -year, $ 750.0 million revolving credit agreement maturing in August 2023 with Bank of America, N.A. and the other lenders named therein (the “Amended Credit Agreement”), which includes a combined letter of credit sub-facility of up to $ 25.0 million, a U.S. swing-line loan facility of up to $ 75.0 million, and a Canadian swing-line loan facility of up to $ 20.0 million. The Amended Credit Agreement includes a $ 100.0 million sublimit (in U.S. or Canadian dollars) for borrowings by Graybar Canada. The Amended Credit Agreement contains an accordion feature, which allows us to request increases in the aggregate borrowing commitments of up to $ 375.0 million. Interest on our borrowings under the Amended Credit Agreement will be based on, at the borrower’s election, either (A) in the case of Graybar as borrower (i) the base rate (as defined in the agreement) plus a margin ranging from 0.00 % to 0.60 %, or (ii) LIBOR plus a margin ranging from 1.00 % to 1.60 % or (B) in the case of Graybar Canada as borrower (i) the base rate (as defined in the agreement) plus a margin ranging from 0.00 % to 0.60 % or (ii) CDOR plus a margin ranging from 1.00 % to 1.60 %, in either case, as determined by the pricing grid set forth in the Amended Credit Agreement, subject to adjustment based upon the consolidated leverage ratio. In connection with such a borrowing, the applicable borrower will also select the term of the loan, up to six months, or automatically renew with the consent of the lenders. Swing line loans, which are daily loans, will bear interest at a rate based on, at the borrower’s election, either (i) the base rate or (ii) the daily floating Eurodollar rate (or CDOR, in the case of Graybar Canada). In addition to interest payments, there are certain fees and obligations associated with borrowings, swing-line loans, letters of credit and other administrative matters. Borrowings of Graybar Canada may be in U.S. dollars or Canadian dollars. The obligations of Graybar Canada are secured by the guaranty of Graybar and any material domestic subsidiaries of Graybar (as defined). Under no circumstances will Graybar Canada use its borrowings to benefit Graybar or its operations, including without limitation to repay any of Graybar’s obligations under the facility. The Amended Credit Agreement provides for a quarterly commitment fee ranging from 0.25 % to 0.40 % per annum, subject to adjustment based upon the consolidated leverage ratio for a fiscal quarter, and letter of credit fees ranging from 1.00 % to 1.60 % per annum payable quarterly, subject to such adjustment. Availability under the Amended Credit Agreement is subject to the accuracy of representations and warranties and absence of a default and, in the case of Canadian borrowings denominated in Canadian dollars, the absence of a material adverse change in the national or international financial markets that would make it impracticable to lend Canadian dollars. The Amended Credit Agreement also provides for customary events of default, including a failure to pay principal, interest or fees when due, failure to comply with covenants, the fact that any representation or warranty made by any of the credit parties is materially incorrect, the occurrence of an event of default under certain other indebtedness by us and our subsidiaries, the commencement of certain insolvency or receivership events affecting any of the credit parties, certain actions under the Employee Retirement Income Security Act of 1974 ("ERISA") and the occurrence of a change in control of any of the credit parties (subject to certain permitted transactions as described in the Amended Credit Agreement). Upon the occurrence of an event of default, the commitments of the lenders may be terminated and all outstanding obligations of the credit parties under the Amended Credit Agreement may be declared immediately due and payable. The Amended Credit Agreement contains affirmative and negative covenants customary for credit facilities of this type, including limitations on us and our subsidiaries with respect to indebtedness (with specified, limited exceptions), liens, changes in the nature of our business, investments, mergers and acquisitions, issuance of equity securities, dispositions of assets and dissolution of certain subsidiaries, transactions with affiliates, restricted payments (subject to incurrence tests, with certain exceptions, including payments under senior notes), as well as securitizations, factoring transactions, and transactions with sanctioned parties or in violation of certain U.S. or Canadian anti-corruption laws. There are also maximum leverage ratio and minimum interest coverage ratio financial covenants to which we will be subject to during the term of the Amended Credit Agreement. We were in compliance with all covenants under the Amended Credit Agreement as of December 31, 2019 and 2018. Short-term borrowings of $ 138.0 million and $ 235.0 million outstanding at December 31, 2019 and 2018, respectively, were drawn under the Amended Credit Agreement. Short-term borrowings outstanding during the years ended December 31, 2019 and 2018 ranged from a minimum of $ 10.0 million and $ 140.0 million to a maximum of $ 257.0 million and $ 261.0 million, respectively. The average daily amount of borrowings outstanding under the Amended Credit Agreement during 2019 and 2018 amounted to approximately $ 151.0 million and $ 202.0 million at weighted-average interest rates of 3.42 % and 3.05 %, respectively. The weighted-average interest rate for amounts outstanding at December 31, 2019 was 2.78 %. At December 31, 2019, we had available unused committed lines of credit under the Amended Credit Agreement amounting to $ 611.5 million, compared to $ 515.0 million at December 31, 2018. Interest expense, net was $ 5.5 million, $ 6.9 million, and $ 4.2 million for the years ended December 31, 2019, 2018, and 2017, respectively. Private Placement Shelf Agreements We have an uncommitted $ 100.0 million private placement shelf agreement with PGIM, Inc. (the "Prudential Shelf Agreement"), which is expected to allow us to issue senior promissory notes to affiliates of PGIM, Inc. at fixed rate terms to be agreed upon at the time of any issuance during a three-year issuance period ending in August 2020. We also have an uncommitted $ 100.0 million private placement shelf agreement (the "MetLife Shelf Agreement") with Metropolitan Life Insurance Company and MetLife Investment Advisors, LLC and each other affiliate of MetLife that becomes a party to the agreement (collectively, "MetLife"). The MetLife Shelf Agreement is expected to allow us to issue senior promissory notes to MetLife at fixed or floating rate economic terms to be agreed upon at the time of issuance during a three-year period ending August 2021. We remain obligated under a most favored lender clause which is designed to ensure that any notes in the future under the Prudential Shelf Agreement and MetLife Shelf Agreement will continue to be of equal ranking with indebtedness under our Amended Credit Agreement. No notes have been issued under either the Prudential Shelf Agreement or the MetLife Shelf Agreement as of December 31, 2019 and 2018. Each shelf agreement contains representations and warranties of the Company and the applicable lender, customary events of default and affirmative and negative covenants, customary for agreements of this type. These covenants are substantially similar to those contained in the Amended Credit Agreement, subject to a number of exceptions and qualifications set forth in the applicable shelf agreement. All outstanding obligations of Graybar under one or both of these agreements may be declared immediately due and payable upon the occurrence of an event of default. We were in compliance with all covenants under the Prudential Shelf Agreement and the Metlife Shelf Agreements as of December 31, 2019 and 2018. Letters of Credit We had total letters of credit of $ 5.6 million outstanding at December 31, 2019, of which $ 0.5 million were issued under the Amended Credit Agreement. We had total letters of credit of $ 5.6 million outstanding at December 31, 2018, of which no ne were issued under the Amended Credit Agreement. The letters of credit are issued primarily to support certain workers' compensation insurance policies.

Pension And Other Postretiremen

Pension And Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2019
Pension And Other Postretirement Benefits [Abstract]
Pension And Other Postretirement Benefits	13. PENSION AND OTHER POSTRETIREMENT BENEFITS We have a noncontributory defined benefit pension plan (the "Pension Plan") covering substantially all employees first hired prior to July 1, 2015 after the completion of one year of service and 1,000 hours of service. The Pension Plan provides retirement benefits based on an employee’s final average earnings and years of service. These employees become 100 % vested after three years of service, regardless of age. A supplemental benefit plan provides nonqualified pension benefits for compensation in excess of the IRS compensation limits applicable to the Pension Plan and eligible compensation deferred by a participant. Our funding policy is to make contributions to the Pension Plan, provided that the total annual contributions will not be less than ERISA and the Pension Protection Act of 2006 minimums or greater than the maximum tax-deductible amount, to review the contribution and funding strategy on a regular basis, and to allow discretionary contributions to be made by us from time to time. The assets of the Pension Plan are invested primarily in fixed income investments and equity securities. We pay nonqualified pension benefits when they are due according to the terms of the supplemental benefit plan. We provide certain postretirement healthcare and life insurance benefits to retired employees. Substantially all of our employees hired or rehired prior to 2014 may become eligible for postretirement medical benefits if they reach the age and service requirements of the retiree medical plan and retire on a pension (except a deferred pension) under the Pension Plan. Medical benefits are self-insured and claims are administered through a third party administrator. The cost of coverage is determined based on the annual projected plan costs. The participant's premium or cost is determined based on Company guidelines. Postretirement life insurance benefits are insured through an insurance company. We fund postretirement benefits as incurred, and accordingly, there were no assets held in the postretirement benefits plan at December 31, 2019 and 2018. The following table sets forth information regarding the funded status of our pension and other postretirement benefits as of December 31, 2019 and 2018: Pension Benefits Postretirement Benefits 2019 2018 2019 2018 Change in Benefit Obligation: Benefit obligation at beginning of period $ 708.8 $ 756.3 $ 72.5 $ 76.8 Service cost 25.6 28.6 2.0 2.3 Interest cost 30.0 27.3 2.9 2.6 Actuarial loss (gain) 117.0 ( 57.7 ) 3.0 ( 5.2 ) Benefits paid from plan assets ( 52.3 ) ( 42.5 ) — — Benefits paid from Company assets ( 1.7 ) ( 1.6 ) ( 5.8 ) ( 5.6 ) Plan participants' contributions — — 1.4 1.6 Administrative expenses paid ( 2.3 ) ( 1.6 ) — — Plan amendments — — 0.2 — Benefit Obligation at End of Period 825.1 708.8 76.2 72.5 Change in Plan Assets: Fair value of plan assets at beginning of period 588.3 585.4 — — Actual return on plan assets 114.7 ( 33.0 ) — — Employer contributions (A) 11.7 81.6 4.4 4.0 Plan participants' contributions — — 1.4 1.6 Benefits paid (A) ( 54.0 ) ( 44.1 ) ( 5.8 ) ( 5.6 ) Administrative expenses paid ( 2.3 ) ( 1.6 ) — — Fair Value of Plan Assets at End of Period 658.4 588.3 — — Unfunded Status $ 166.7 $ 120.5 $ 76.2 $ 72.5 (A) Includes $ 1.7 million and $ 1.6 million paid from our assets for unfunded nonqualified pension benefits in fiscal years 2019 and 2018, respectively. The accumulated benefit obligation for our Pension Plan was $ 746.8 million and $ 636.3 million at December 31, 2019 and 2018, respectively. Amounts recognized in the consolidated balance sheet for the years ended December 31 consist of the following: Pension Benefits Postretirement Benefits 2019 2018 2019 2018 Current accrued benefit cost $ 2.1 $ 1.9 $ 6.8 $ 5.8 Non-current accrued benefit cost 164.6 118.6 69.4 66.7 Net amount recognized $ 166.7 $ 120.5 $ 76.2 $ 72.5 Current accrued benefit cost for both pension benefits and postretirement benefits is included in other current liabilities in the consolidated balance sheets. Non-current accrued benefit cost for pension benefits and postretirement benefits are included in pension liability and postretirement benefits liability, respectively, in the consolidated balance sheets. Amounts recognized in accumulated other comprehensive loss for the years ended December 31, net of tax, consist of the following: Pension Benefits Postretirement Benefits 2019 2018 2019 2018 Net actuarial loss $ 232.4 $ 219.6 $ 10.4 $ 8.3 Prior service cost (gain) — — 0.1 — Accumulated other comprehensive loss $ 232.4 $ 219.6 $ 10.5 $ 8.3 Amounts estimated to be amortized from accumulated other comprehensive loss into net periodic benefit costs in 2020, net of tax, consist of the following: Pension Benefits Postretirement Benefits Net actuarial loss $ 21.5 $ 0.5 Accumulated other comprehensive loss $ 21.5 $ 0.5 Weighted-average assumptions used to determine the actuarial present value of the pension and postretirement benefit obligations as of December 31 are: Pension Benefits Postretirement Benefits 2019 2018 2019 2018 Discount rate 3.38 % 4.31 % 3.19 % 4.16 % Rate of compensation increase 4.36 % 4.49 % — — Healthcare cost trend on covered charges — — 5.00 % 5.00 % A one percentage point increase or decrease in the assumed healthcare cost trend rate would not have had a material effect on the postretirement benefit obligations as of December 31, 2019 and 2018. The net periodic benefit cost for the years ended December 31, 2019, 2018, and 2017 included the following components: Pension Benefits Postretirement Benefits Components of Net Periodic Benefit Cost 2019 2018 2017 2019 2018 2017 Selling, general, and administrative expenses: Service cost $ 25.6 $ 28.6 $ 26.4 $ 2.0 $ 2.3 $ 2.3 Total selling, general, and administrative expenses $ 25.6 $ 28.6 $ 26.4 $ 2.0 $ 2.3 $ 2.3 Non-operating expenses: Interest cost 30.0 27.3 27.8 2.9 2.6 2.9 Expected return on plan assets ( 34.1 ) ( 31.9 ) ( 30.6 ) — — — Amortization of: Net actuarial loss 19.1 26.5 21.5 0.3 0.9 0.8 Prior service cost (gain) — 0.3 0.4 — ( 2.0 ) ( 2.2 ) Total non-operating expenses $ 15.0 $ 22.2 $ 19.1 $ 3.2 $ 1.5 $ 1.5 Net periodic benefit cost $ 40.6 $ 50.8 $ 45.5 $ 5.2 $ 3.8 $ 3.8 Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31 were: Pension Benefits Postretirement Benefits 2019 2018 2017 2019 2018 2017 Discount rate 4.31 % 3.67 % 4.15 % 4.16 % 3.44 % 3.78 % Expected return on plan assets 5.75 % 5.75 % 5.75 % — — — Rate of compensation increase 4.36 % 4.49 % 4.52 % — — — Healthcare cost trend on covered charges — — — 5.00 % 5.50 % / 5.00 % 6.00 % / 5.00 % The expected return on plan assets assumption for the Pension Plan is a long-term assumption and was determined after evaluating input from both the plan’s actuary and pension fund investment advisors, consideration of macroeconomic conditions, historical rates of return on plan assets, and anticipated current and long-term rates of return on the various classes of assets in which the plan invests. For measurement of the postretirement benefits net periodic cost, a 5.00 % annual rate of increase in per capita cost of covered healthcare benefits was assumed for 2019. The rate was assumed to remain at 5.00 % in 2020 and to remain at that level thereafter. A one percentage point increase or decrease in the assumed healthcare cost trend rate would not have had a material effect on 2019, 2018 and 2017 net periodic benefit cost. We expect to fund $ 1.8 million for nonqualified pension benefits during 2020. Required pension contributions under ERISA regulations are expected to be $ 40.0 million in 2020; however, additional contributions may be made at our discretion. Estimated future defined benefit pension and other postretirement benefit plan payments to plan participants for the years ending December 31 are as follows: Year Pension Benefits Postretirement Benefits 2020 $ 62.0 $ 6.9 2021 58.3 7.5 2022 58.2 7.7 2023 59.2 7.5 2024 59.1 7.3 2025 to 2029 296.8 33.0 The investment objective of our Pension Plan is to ensure that there are sufficient assets to fund regular pension benefits payable to employees over the long-term life of the plan. Our Pension Plan seeks to allocate plan assets in a manner that is closely duration-matched with the actuarial projected cash flow liabilities, consistent with prudent standards for preservation of capital, tolerance of investment risk, and maintenance of liquidity. Assets of the qualified pension plan are held by Comerica Bank (the "Trustee"). Our Pension Plan utilizes a liability-driven investment (“LDI”) approach to help meet these objectives. The LDI strategy employs a structured fixed-income portfolio designed to reduce volatility in the plan's future funding requirements and funding status. This is accomplished by using a blend of long duration government, quasi-governmental and corporate fixed-income securities, as well as appropriate levels of equity and alternative investments designed to optimize the plan's liability hedge ratio. In practice, the value of an asset portfolio constructed primarily of fixed income securities is inversely correlated to changes in market interest rates, primarily offsetting changes in the value of the pension benefit obligation caused by changes in the interest rate used to discount plan liabilities. Asset allocation information for the Pension Plan at December 31, 2019 and 2018 is as follows: Investment 2019 Actual Allocation 2019 Target Allocation Range 2018 Actual Allocation 2018 Target Allocation Range Equity securities-U.S. 6 % 3 - 10 % 5 % 3 - 15 % Equity securities-International 9 % 2 - 10 % 8 % 3 - 15 % Fixed income investments 68 % 40 - 80 % 71 % 38 - 85 % Hedge funds 5 % 2 - 8 % 5 % 5 - 15 % Private markets 4 % 0 - 15 % 4 % 3 - 13 % Other investments 8 % 0 - 14 % 7 % 0 - 10 % Short-term investments — % 1 - 10 % — % 0 - 3 % Total 100 % 100 % 100 % 100 % Certain reclassifications have been made to the classes of plan assets in prior year to conform to the December 31, 2019 presentation due to a change in our investment policy in 2019. The following is a description of the valuation methodologies used for assets held by the Pension Plan measured at fair value: Equity securities - U.S. Equity securities - U.S. consist of investments in U.S. corporate stocks and U.S. equity mutual funds. U.S. equity mutual funds include publicly traded mutual funds and a bank collective fund for ERISA plans. U.S. corporate stocks and U.S. equity mutual funds are primarily large-capitalization stocks (defined as companies with market capitalization of more than $10 billion). U.S. corporate stocks and publicly traded mutual funds are valued at the closing price reported on the active public market in which the individual securities are traded and are classified as Level 1. The bank collective fund for ERISA plans is valued at the net asset value ("NAV") of units of the fund. The NAV, as provided by the Trustee, is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund. Equity securities – International Equity securities - International consist of investments in international corporate stocks, publicly traded mutual funds, and a collective investment trust, and are primarily investments within developed and emerging markets. Investments other than the collective investment trust are valued at the closing price reported on the active public market in which the individual securities are traded and are classified as Level 1. The collective investment trust is valued at the NAV of units of the fund. The NAV, as provided by the Trustee, is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund. Audited financial statements are produced on an annual basis for the collective investment trust. Fixed income investments Fixed income investments consist of U.S. and international corporate bonds, government and government agency bonds, as well as a publicly traded mutual fund and commingled funds, both of which invest in corporate and government debt securities within the U.S. U.S. and international corporate bonds, government and government agency bonds, and the publicly traded mutual fund are valued at the closing price reported on the active market in which they are traded and thus are classified as Level 1. The commingled funds are valued at the NAV of units of the fund. The NAV, as provided by the Trustee, is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund. Hedge funds Hedge funds consist of investments in various hedge funds structured as fund-of-funds (defined as a single fund that invests in multiple funds). The hedge funds use various investment strategies in an attempt to generate non-correlated returns. A fund-of-funds is designed to help diversify and reduce the risk of the overall portfolio. The hedge funds are valued at the NAV of units of the fund. The NAV, as provided by the Trustee, is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund. Audited financial statements are produced on an annual basis for the hedge funds. Private markets Private markets consist of private equity investments. Private markets is an asset class that is generally characterized as requiring long-term commitments and where liquidity is typically limited. Private markets do not have an actively traded market with readily observable prices. The investments are limited partnerships (“LP”) and are diversified across typical private equity strategies including: buyouts, co-investments, secondary offerings, venture capital, real estate, and special situations. Valuations are developed using a variety of proprietary model methodologies. Valuations may be derived from publicly available sources as well as information obtained from each fund's general partner based upon public market conditions and returns. All private markets investments are classified as Level 3, other than a real estate investment trust (“REIT”). The REIT is a commingled trust valued at the NAV of units of the trust. The NAV, as provided by the Trustee, is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund. Audited financial statements are produced on an annual basis for the private markets investments. Other investments Other investments consist of investments in a diversified mutual fund, a private debt fund, and a high-yield bond fund. The diversified mutual fund is valued using quoted prices in an active market, and is therefore classified as Level 1. The private debt fund is valued using unobservable inputs with limited trading activity, and is therefore classified as Level 3. The high-yield bond fund is valued using the NAV based on the fair value of the underlying investments held by the fund. The NAV, as provided by the Trustee, is used as a practical expedient to estimate fair value. Audited financial statements are produced on an annual basis for the private debt fund and the high-yield bond fund. Short-term investments Short-term investments consist of cash and cash equivalents in a short-term fund which is valued at the NAV of units of the fund. The NAV, as provided by the Trustee, is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund. The methods described above may produce fair value calculations that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while we believe our Pension Plan valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. There have been no changes in the methodologies for determining fair value at December 31, 2019 or 2018. The following tables set forth, by level within the fair value hierarchy, the Pension Plan assets measured at fair value as of December 31, 2019 and 2018: December 31, 2019 Investment Investments Measured at NAV Level 1 Level 2 Level 3 Total Equity securities - U.S. $ 14.0 $ 26.0 $ — $ — $ 40.0 Equity securities - International 20.7 37.9 — — 58.6 Fixed income investments 312.7 135.2 — — 447.9 Hedge funds 32.0 — — — 32.0 Private markets 17.0 — — 11.0 28.0 Other investments 17.7 20.4 — 11.4 49.5 Short-term investments 2.4 — — — 2.4 Total $ 416.5 $ 219.5 $ — $ 22.4 $ 658.4 December 31, 2018 Investment Investments Measured at NAV Level 1 Level 2 Level 3 Total Equity securities - U.S. $ 10.7 $ 19.3 $ — $ — $ 30.0 Equity securities - International — 47.6 — — 47.6 Fixed income investments 291.7 124.9 — — 416.6 Hedge funds 30.7 — — — 30.7 Private markets 16.3 — — 6.0 22.3 Other investments 18.2 15.9 — 4.4 38.5 Short-term investments 2.6 — — — 2.6 Total $ 370.2 $ 207.7 $ — $ 10.4 $ 588.3 The tables below set forth a summary of changes in the fair value of the Pension Plan's Level 3 assets for the years ended December 31, 2019 and 2018: December 31, 2019 Private Markets Other Investments Total Balance, beginning of year $ 6.0 $ 4.4 $ 10.4 Realized gains 0.1 — 0.1 Unrealized gains 0.7 0.8 1.5 Purchases 4.4 6.8 11.2 Sales ( 0.2 ) ( 0.6 ) ( 0.8 ) Balance, end of year $ 11.0 $ 11.4 $ 22.4 December 31, 2018 Private Markets Other Investments Total Balance, beginning of year $ 3.8 $ 3.9 $ 7.7 Realized gains 0.1 — 0.1 Purchases 3.2 0.9 4.1 Sales ( 1.1 ) ( 0.4 ) ( 1.5 ) Balance, end of year $ 6.0 $ 4.4 $ 10.4 Certain reclassifications have been made to the classes of plan assets in prior year to conform to the December 31, 2019 presentation due to a change in our investment policy in 2019.

Profit Sharing And Savings Plan

Profit Sharing And Savings Plan	12 Months Ended
	Dec. 31, 2019
Profit Sharing And Savings Plan [Abstract]
Profit Sharing And Savings Plan	14. PROFIT SHARING AND SAVINGS PLAN We provide a defined contribution profit sharing and savings plan (the "Plan") covering substantially all of our eligible employees with an individual account for each participant. Employees may make voluntary before-tax and/or after-tax contributions to the saving portion of the Plan, ranging from 2 % to 50 % of pay, subject to limitations imposed by federal tax law, ERISA, and the Pension Protection Act of 2006. Substantially all employees hired or rehired after July 1, 2015 are eligible to receive a Company matching contribution beginning the first month after the completion of one year of service and 1,000 hours of service. Effective July 1, 2019, eligible employees receive Company matching contributions beginning the first month after the completion of six months of service and 500 hours of service. The Company match is equal to 50 % of an eligible employee's before-tax or Roth payroll contribution, up to 6 % of pay per payroll period, with a maximum match per payroll period of 3 %. The matching contribution expense recognized by us was $ 2.7 million, $ 1.8 million, and $ 0.7 million for the years ended December 31, 2019, 2018 and 2017, respectively. Annual contributions made by us to the profit-sharing portion of the Plan are determined by the Board of Directors at its discretion, and are generally based on the profitability of the Company. Expense recognized by us under the profit-sharing portion of the Plan was $ 56.8 million, $ 67.4 million, and $ 43.2 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies [Abstract]
Commitments And Contingencies	15. COMMITMENTS AND CONTINGENCIES Rental expense was $ 36.4 million, $ 29.4 million, and $ 27.3 million in 2019, 2018, and 2017, respectively. For future minimum rental payments required under operating leases that have either initial or remaining noncancelable lease terms in excess of one year as of December 31, 2019, refer to Note 7, “Leases”. We are subject to various claims, disputes, and administrative and legal matters incidental to our past and current business activities. As a result, contingencies can arise resulting from an existing condition, situation, or set of circumstances involving an uncertainty as to the realization of a possible loss. Estimated loss contingencies are accrued only if the loss is probable and the amount of the loss can be reasonably estimated. With respect to a particular loss contingency, it may be probable that a loss has occurred but the estimate of the loss is a wide range. If we deem an amount within the range to be a better estimate than any other amount within the range, that amount will be accrued. However, if no amount within the range is a better estimate than any other amount, the minimum amount of the range is accrued. While we believe that none of these claims, disputes or administrative and legal matters will have a material adverse effect on our financial position, these matters are uncertain and we cannot at this time determine whether the financial impact, if any, of these matters will be material to our results of operations in the period in which such matters are resolved or a better estimate becomes available.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2019
Accumulated Other Comprehensive Loss [Abstract]
Accumulated Other Comprehensive Loss	16. ACCUMULATED OTHER COMPREHENSIVE LOSS The components of accumulated other comprehensive loss as of December 31 are as follows: 2019 2018 Currency translation $ ( 7.7 ) $ ( 12.4 ) Pension liability ( 232.4 ) ( 219.6 ) Postretirement benefits liability ( 10.5 ) ( 8.3 ) Accumulated other comprehensive loss $ ( 250.6 ) $ ( 240.3 ) The following table represents amounts reclassified from accumulated other comprehensive loss for the years ended December 31, 2019 and 2018: 2019 2018 Amortization of Pension and Other Postretirement Benefits Items Amortization of Pension and Other Postretirement Benefits Items Actuarial Losses Recognized Prior Service Costs Recognized Total Actuarial Losses Recognized Prior Service Costs Recognized Total Affected Line in Consolidated Statement of Income: Non-operating expenses $ 19.4 $ — $ 19.4 $ 27.4 $ ( 1.7 ) $ 25.7 Tax (benefit) expense ( 5.0 ) — ( 5.0 ) ( 7.0 ) 0.4 ( 6.6 ) Total reclassifications for the period, net of tax $ 14.4 $ — $ 14.4 $ 20.4 $ ( 1.3 ) $ 19.1 The following table represents the activity included in accumulated other comprehensive loss for the years ended December 31, 2019 and 2018: 2019 2018 Foreign Currency Pension and Other Postretirement Benefits Total Foreign Currency Pension and Other Postretirement Benefits Total Beginning balance January 1, $ ( 12.4 ) $ ( 227.9 ) $ ( 240.3 ) $ ( 4.6 ) $ ( 245.5 ) $ ( 250.1 ) Other comprehensive income (loss) before reclassifications 4.7 — 4.7 ( 7.8 ) — ( 7.8 ) Amounts reclassified from accumulated other comprehensive loss (net of tax $( 5.0 ) and $( 6.6 )) — 14.4 14.4 — 19.1 19.1 Actuarial loss, (net of tax $ 10.2 and $ 0.5 ) — ( 29.4 ) ( 29.4 ) — ( 1.5 ) ( 1.5 ) Net current-period other comprehensive income (loss) 4.7 ( 15.0 ) ( 10.3 ) ( 7.8 ) 17.6 9.8 Ending balance December 31, $ ( 7.7 ) $ ( 242.9 ) $ ( 250.6 ) $ ( 12.4 ) $ ( 227.9 ) $ ( 240.3 )

Quarterly Financial Information

Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information (Unaudited) [Abstract]
Quarterly Financial Information (Unaudited)	17. QUARTERLY FINANCIAL INFORMATION (UNAUDITED) The following tables set forth selected quarterly financial data for the years ended December 31, 2019 and 2018: 2019 For the Quarter Ended March 31, June 30, September 30, December 31, Net sales $ 1,777.8 $ 1,948.0 $ 1,981.4 $ 1,816.7 Gross margin $ 338.7 $ 367.7 $ 377.8 $ 344.8 Net income attributable to the Company $ 34.3 $ 47.0 $ 48.8 $ 14.4 Net income attributable to the Company per share of common stock (A) $ 1.51 $ 2.08 $ 2.17 $ 0.65 (A) All periods adjusted for a 5 % stock dividend declared in December 2019. Prior to these adjustments, the average common shares outstanding for the first, second, third, and fourth quarters of 2019 were 21,616,141 shares, 21,513,493 shares, 21,449,751 shares, and 21,390,053 shares, respectively. 2018 For the Quarter Ended March 31, June 30, September 30, December 31, Net sales $ 1,637.7 $ 1,832.3 $ 1,870.3 $ 1,862.2 Gross margin $ 311.4 $ 351.2 $ 353.4 $ 364.9 Net income attributable to the Company $ 21.1 $ 44.5 $ 53.6 $ 24.1 Net income attributable to the Company per share of common stock (A) $ 0.93 $ 1.98 $ 2.38 $ 1.08 (A) All periods adjusted for a 5 % stock dividend declared in December 2019 and a 10 % stock dividend declared in December 2018. Prior to these adjustments, the average common shares outstanding for the first, second, third, and fourth quarters of 2018 were 19,544,758 shares, 19,500,916 shares, 19,465,072 shares, and 19,454,943 shares, respectively.

Summary Of Significant Accoun_2

Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of Graybar and its subsidiary companies. All material intercompany balances and transactions have been eliminated. The ownership interests that are held by owners other than the Company in subsidiaries consolidated by the Company are accounted for and reported as noncontrolling interests.
Estimates	Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results could differ from these estimates.
Subsequent Events	Subsequent Events We have evaluated subsequent events through the time of the filing of this Annual Report on Form 10-K with the Commission. No material subsequent events have occurred since December 31, 2019 that require recognition or disclosure in our financial statements.
Revenue Recognition	Revenue Recognition Sales revenue is recognized when performance obligations are satisfied, which is typically upon delivery of the product to the customer. Sometimes product is purchased from the manufacturer and drop-shipped to the customer. We generally take control of the goods when shipped by the manufacturer and then recognize revenue when control of the product transfers to the customer. Revenues recognized are primarily for product sales, but may also include freight and handling charges. Our standard warehouse shipping terms are FOB shipping point, under which control passes to the customer at the time of shipment. We also earn revenue for professional services, general contracting services, and storage services. Such service revenue represented less than 1 % of gross sales for the years ended December 31, 2019, 2018, and 2017. Revenue is reported net of all taxes, primarily sales tax, assessed by governmental authorities as a result of revenue-producing transactions.
Outgoing Freight Expenses	Outgoing Freight Expenses We record 95 % of outgoing freight expenses as a component of selling, general and administrative expenses. Total outgoing freight expenses were $ 68.5 million, $ 65.7 million, and $ 57.7 million for the years ended December 31, 2019, 2018, and 2017, respectively.
Cash and Cash Equivalents	Cash and Cash Equivalents We account for cash on hand, deposits in banks, and other short-term, highly liquid investments with an original maturity of three months or less as cash and cash equivalents.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts We perform ongoing credit evaluations of our customers, and a significant portion of our trade receivables is secured by mechanic’s lien or payment bond rights. We maintain allowances to reflect the expected uncollectability of trade receivables based on past collection history and specific risks identified in the receivables portfolio. Although actual credit losses have historically been within management’s expectations, additional allowances may be required if the financial condition of our customers were to deteriorate.
Merchandise Inventory	Merchandise Inventory Our inventory is stated at the lower of cost (generally determined using the last-in, first-out (“LIFO”) cost method) or market. LIFO accounting is a method of accounting that, compared with other inventory accounting methods, generally provides better matching of current costs with current sales. We make provisions for obsolete or excess inventories as necessary to reflect reductions in inventory value.
Vendor Allowances	Vendor Allowances Our agreements with many of our suppliers provide for us to earn volume incentives based on purchases during the agreement period. Based on the provisions of our vendor agreements, we develop vendor accrual rates by estimating our performance under the agreements and the amounts that will be earned. We perform analyses and review historical trends to ensure the deferred amounts earned are appropriately recorded. Certain vendor agreements contain purchase volume incentives that provide for increased funding when graduated purchase volumes are met. Amounts accrued throughout the year are based on estimates of future activity levels, and could be materially impacted if actual purchase volumes differ. Changes in the estimated amount of incentives are treated as changes in estimate and are recognized in earnings in the period in which the change in estimate occurs. In the event that the operating performance of our suppliers were to decline, however, there can be no assurance that amounts earned would be paid or that the volume incentives would continue to be included in future agreements.
Property and Depreciation	Property and Depreciation Property, plant and equipment are recorded at cost. Depreciation is expensed on a straight-line basis over the estimated useful lives of the related assets. Interest costs incurred to finance expenditures for major long-term construction projects are capitalized as part of the asset's historical cost and included in property, plant and equipment, then depreciated over the useful life of the asset. Leasehold improvements are amortized over the term of the lease or the estimated useful life of the improvement, whichever is shorter. Expenditures for maintenance and repairs are charged to expense when incurred, while the costs of significant improvements, which extend the useful life of the underlying asset, are capitalized.
Credit Risk	Credit Risk Financial instruments that potentially expose us to concentrations of credit risk consist primarily of trade receivables. We perform ongoing credit evaluations of our customers, and a significant portion of our trade receivables are secured by mechanic’s lien or payment bond rights. We maintain allowances for potential credit losses, and such losses historically have been within management’s expectations.
Fair Value	Fair Value We endeavor to utilize the best available information in measuring fair value. GAAP has established a fair value hierarchy, which prioritizes the inputs used in measuring fair value. The tiers in the hierarchy include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own data inputs and assumptions. We have used fair value measurements to value our pension plan assets.
Foreign Currency Exchange Rate	Foreign Currency Exchange Rate The functional currency for our Canadian subsidiary is the Canadian dollar. Accordingly, its balance sheet amounts are translated at the exchange rates in effect at the end of each reporting period and its statements of income amounts are translated at the average rates of exchange prevailing during the current period. Currency translation adjustments are included in accumulated other comprehensive loss.
Goodwill	Goodwill Our goodwill is not amortized, but rather tested annually for impairment. Goodwill is reviewed annually in the fourth quarter and when circumstances or other events might indicate that impairment may have occurred. We first perform a qualitative assessment of goodwill impairment. The qualitative assessment considers several factors including the excess fair value over carrying value as of the last quantitative impairment test, the length of time since the last fair value measurement, the current carrying value, market conditions, actual performance compared to forecasted performance, and the current business outlook. If the qualitative assessment indicates that it is more likely than not that goodwill is impaired, the reporting unit is then quantitatively tested for impairment. If a quantitative assessment is required, the fair value is determined using a variety of assumptions including estimated future cash flows of the reporting unit using applicable discount rates.
Definite Lived Intangible Assets	Definite Lived Intangible Assets The cost of intangible assets with determinable useful lives is amortized to reflect the pattern of economic benefits consumed, either on a straight-line or accelerated basis over the estimated periods benefited. Customer relationships, trade names and other non-contractual intangible assets with determinable lives are amortized over periods generally ranging from 3 to 20 years. Intangible assets are tested for impairment if events or circumstances occur indicating that the respective asset might be impaired.
Income Taxes	Income Taxes We recognize deferred tax assets and liabilities to reflect the future tax consequences of events that have been recognized in the financial statements or tax returns. A deferred tax asset or liability results from the temporary difference between an item’s carrying value as reflected in the financial statements and its tax basis, and is calculated using enacted applicable tax rates. We assess the likelihood that our deferred tax assets will be recovered from future taxable income and, to the extent we believe that recovery is not likely, a valuation allowance is established. Changes in the valuation allowance, when recorded, are included in the provision for income taxes in the consolidated financial statements. We classify interest expense and penalties as part of our provision for income taxes based upon applicable federal and state interest/underpayment percentages. We assess uncertainty regarding tax positions taken in previously filed returns and record reserves in accordance with the guidance under Accounting Standards Codification ("ASC") 740-10, "Accounting for Uncertainty in Income Taxes".
Other Postretirement Benefits	Other Postretirement Benefits We account for postretirement benefits other than pension benefits by accruing the costs of benefits to be provided over the eligible employees’ periods of active service. These costs are determined on an actuarial basis. Our consolidated balance sheets reflect the funded status of postretirement benefits.
Pension Plan	Pension Plan We sponsor a noncontributory defined benefit pension plan accounted for by accruing the cost to provide the benefits over the eligible employees’ periods of active service. These costs are determined on an actuarial basis. Our consolidated balance sheets reflect the funded status of the defined benefit pension plan.
Leases	Leases We determine if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, current operating lease liabilities, and non-current operating lease liabilities on our consolidated balance sheets. Amounts related to finance leases are included in property and equipment, current portion of long-term debt, and long-term debt on our consolidated balance sheets. ROU assets and lease liabilities are recognized and measured on the date the underlying asset is made available to us. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. We use our incremental borrowing rate based on the information available at the commencement date in determining the present value of future payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Operating lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. For certain leases, such as real estate and information technology (IT) equipment, we account for the lease and non-lease components as a single lease component. For all other leases, we account for the lease and non-lease components separately. We have elected as an accounting policy not to apply the recognition requirements for short-term leases. Therefore, leases with a term of twelve months or less are not recorded on the consolidated balance sheets. Lease expenses associated with short-term leases are immaterial and are recorded in the consolidated statements of income in selling, general and administrative expenses. Additionally, for certain vehicle leases, we apply a portfolio approach to account for the operating lease ROU assets and liabilities.
Non-Operating Expenses	Non-Operating Expenses Non-operating expenses are comprised of interest expense, net and non-service cost components of the net periodic benefit cost for the pension and other postretirement benefit plans. The non-service cost components include interest cost, expected return on plan assets, amortization of net actuarial gains/losses, and amortization of prior service costs/gains.
New Accounting Standards	New Accounting Standards No new accounting standards that were issued or became effective during 2019 have had or are expected to have a material impact on our consolidated financial statements, except those noted below. We adopted the Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU" or "Update") 2017-07, "Compensation - Retirement Benefits (Topic 715)" ("ASU 2017-07") on January 1, 2018 using the retrospective transition method. The updates to the standard require us to report the service cost component in the same line as other compensation costs arising from services rendered by employees during the reporting period. The other components of net benefit costs are presented in the income statement separately from the service cost and outside of a subtotal of income from operations. As a result of the adoption, the financial statement line previously entitled "interest expense, net" was changed to "non-operating expenses". The impact to the operating results for the year ended December 31, 2017 within the consolidated statements of income as a result of adopting ASU 2017-07 is presented in the tables below: Consolidated Statements of Income Year Ended December 31, 2017 As Reported Reclassification As Adjusted Selling, general and administrative expenses $ 1,047.2 $ ( 20.6 ) $ 1,026.6 Non-operating expenses 4.2 20.6 24.8 On January 1, 2018, we adopted ASC Topic 606, "Revenue from Contracts with Customers." See Note 3, "Revenue", for further information. On January 1, 2019, we adopted ASU 2016-02, “Leases (Topic 842)” ("ASU 2016-02"). See Note 7, “Leases”, for further information. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments", which introduces new guidance for the accounting for credit losses on certain financial instruments. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. We have determined that our trade receivables are financial instruments subject to this Update. We have evaluated the accounting policies applicable to our allowance for doubtful accounts and have developed new methods to include three components into our allowance to comply with requirements of the ASU: 1) a reserve derived from historical loss rates based upon the aging of our trade receivables, 2) a reserve based upon specifically-identified trade receivables in our portfolio that are considered higher risk based on current conditions, and 3) an additional reserve, as necessary, to consider the impact of future economic conditions. We currently believe that the adoption of this Update will not have a material impact on our consolidated financial statements and will adopt this Update beginning on January 1, 2020. In August 2018, the FASB issued ASU 2018-13, "Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement" ("ASU 2018-13") that makes minor changes to the disclosure requirements on fair value measurements in Topic 820. The guidance eliminates requirements for certain disclosures that are no longer considered cost beneficial and adds new disclosure requirements that the FASB considers pertinent. ASU 2018-13 is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The adoption of this Update will not have a material impact on our consolidated financial statements. We will adopt this Update beginning on January 1, 2020. In August 2018, the FASB issued ASU 2018-14, "Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans" ("ASU 2018-14") that makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. The guidance eliminates requirements for certain disclosures that are no longer considered cost beneficial and adds new disclosure requirements that the FASB considers pertinent. ASU 2018-14 is effective for fiscal years ending after December 15, 2020 for public entities. Early adoption is permitted. We are currently evaluating the impact of the adoption of the Update on our consolidated financial statements, but do not expect it to have a material impact. We plan to adopt this Update beginning on January 1, 2021. In August 2018, the FASB issued ASU 2018-15, "Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" ("ASU 2018-15") requiring a customer in a cloud computing arrangement that is a service contract to follow the internal use software guidance in ASC 350-40 to determine which implementation costs to capitalize as assets. Capitalized implementation costs related to a hosting arrangement that is a service contract will be amortized over the term of the hosting arrangement, beginning when the module or component of the hosting arrangement is ready for its intended use. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years for public entities. Early adoption is permitted. The adoption of this Update will not have a material impact on our consolidated financial statements. We will adopt this Update

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]
Schedule of Prospective Adoption of New Accounting Pronouncements	Year Ended December 31, 2017 As Reported Reclassification As Adjusted Selling, general and administrative expenses $ 1,047.2 $ ( 20.6 ) $ 1,026.6 Non-operating expenses 4.2 20.6 24.8

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2019
Revenue [Abstract]
Schedule of New Accounting Pronouncements	Consolidated Statements of Income For the Year Ended December 31, 2018 As Reported Balance without Adoption Effect of Change Net sales $ 7,202.5 $ 7,202.3 $ 0.2 Cost of merchandise sold 5,821.6 5,821.6 — Consolidated Balance Sheet As of December 31, 2018 As Reported Balance without Adoption Effect of Change Merchandise inventory $ 658.7 $ 668.2 $ ( 9.5 ) Other current assets 54.1 54.4 ( 0.3 ) Other non-current liabilities 8.7 19.4 ( 10.7 ) Retained earnings 678.1 677.2 0.9
Disaggregation of Revenue	For the Years Ended December 31, 2019 2018 2017 Construction 60.1 % 59.7 % 58.7 % CIG 20.6 20.8 21.1 Industrial & Utility 19.3 19.5 20.2 Total net sales 100.0 % 100.0 % 100.0 %

Cash Discounts And Doubtful A_2

Cash Discounts And Doubtful Accounts (Tables)	12 Months Ended
	Dec. 31, 2019
Cash Discounts And Doubtful Accounts [Abstract]
Schedule of Cash Discounts and Doubtful Accounts	Beginning Balance Provision (Charged to Expense) Deductions Ending Balance For the Year Ended December 31, 2019 Allowance for cash discounts $ 2.2 $ 35.8 $ ( 35.8 ) $ 2.2 Allowance for doubtful accounts 3.7 7.0 ( 6.7 ) 4.0 Total $ 5.9 $ 42.8 $ ( 42.5 ) $ 6.2 For the Year Ended December 31, 2018 Allowance for cash discounts $ 2.0 $ 33.2 $ ( 33.0 ) $ 2.2 Allowance for doubtful accounts 4.0 2.9 ( 3.2 ) 3.7 Total $ 6.0 $ 36.1 $ ( 36.2 ) $ 5.9 For the Year Ended December 31, 2017 Allowance for cash discounts $ 1.7 $ 31.2 $ ( 30.9 ) $ 2.0 Allowance for doubtful accounts 3.3 3.6 ( 2.9 ) 4.0 Total $ 5.0 $ 34.8 $ ( 33.8 ) $ 6.0

Property And Depreciation (Tabl

Property And Depreciation (Tables)	12 Months Ended
	Dec. 31, 2019
Property And Depreciation [Abstract]
Schedule Of Property And Depreciation	Classification Estimated Useful Asset Life Buildings 42 years Leasehold improvements Over the shorter of the asset’s life or the lease term Furniture, fixtures, equipment and software 3 to 14 years Assets held under finance leases Over the shorter of the asset’s life or the lease term

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Schedule Of Lease Expense	Year Ended December 31, 2019 Operating lease cost $ 33.9 Finance lease cost: Amortization of right-of-use assets 2.2 Interest on lease liabilities 0.7 Total finance lease cost 2.9 Variable lease cost 9.5 Total lease cost $ 46.3
Schedule Of Supplemental Balance Sheet Information	December 31, 2019 Operating leases: Operating lease right-of-use assets $ 117.5 Current operating lease liabilities $ 28.6 Non-current operating lease liabilities 96.2 Total operating lease liabilities $ 124.8 Finance leases: Property, at cost $ 18.3 Less – accumulated depreciation and amortization 9.9 Net property $ 8.4 Current obligations of finance leases $ 2.1 Finance leases, net of current obligations 7.8 Total finance lease liabilities $ 9.9 Weighted average remaining lease term: Operating leases 5.0 years Finance leases 5.1 years Weighted average discount rate: Operating leases 3.3 % Finance leases 7.0 %
Schedule Of Supplemental Cash Flow And Other Information	Year Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 33.5 Operating cash flows from finance leases 0.7 Financing cash flows from finance leases 2.1 Right-of-use assets obtained in exchange for lease liabilities: Operating leases $ 55.9 Finance leases 2.0
Schedule Of Maturity Of Lease Liabilities	December 31, 2019 Operating Leases Finance Leases Future minimum lease payments 2020 $ 32.2 $ 2.7 2021 29.4 2.7 2022 23.6 2.1 2023 18.2 1.5 2024 13.4 1.3 Thereafter 19.0 1.7 Total future minimum lease payments $ 135.8 $ 12.0 Less: imputed interest ( 11.0 ) ( 2.1 ) Total lease obligation $ 124.8 $ 9.9 Less: current obligations ( 28.6 ) ( 2.1 ) Long-term lease obligation $ 96.2 $ 7.8

Goodwill And Other Intangible_2

Goodwill And Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill And Other Intangible Assets [Abstract]
Schedule of Goodwill	2019 2018 Beginning balance $ 30.1 $ 30.1 Goodwill acquired — — Ending balance $ 30.1 $ 30.1
Schedule of Finite-Lived Intangible Assets	As of December 31, 2019 Weighted Average Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships 8.5 to 10.8 years $ 16.7 $ ( 6.7 ) $ 10.0 Trade name 15 to 20 years 14.3 ( 2.8 ) 11.5 Non-compete agreements 3 to 5 years 0.3 ( 0.3 ) — Other intangible assets 10 years 0.1 ( 0.1 ) — Total $ 31.4 $ ( 9.9 ) $ 21.5 As of December 31, 2018 Weighted Average Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Customer relationships 8.5 to 10.8 years $ 17.1 $ ( 5.0 ) $ 12.1 Trade name 15 to 20 years 14.3 ( 2.1 ) 12.2 Non-compete agreements 3 to 5 years 0.3 ( 0.2 ) 0.1 Other intangible assets 10 years 0.2 ( 0.1 ) 0.1 Total $ 31.9 $ ( 7.4 ) $ 24.5
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	2020 $ 2.4 2021 2.4 2022 2.4 2023 2.4 2024 2.4 After 2024 9.5 $ 21.5

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Taxes [Abstract]
Schedule Of Unrecognized Tax Benefits Roll Forward	2019 2018 2017 Balance at January 1, $ 2.6 $ 2.3 $ 1.8 Additions based on tax positions related to current year 0.2 1.1 0.4 Additions based on tax positions of prior years — — 0.3 Reductions for tax positions of prior years ( 0.1 ) ( 0.8 ) ( 0.2 ) Settlements ( 0.8 ) — — Balance at December 31, $ 1.9 $ 2.6 $ 2.3
Schedule Of Effective Income Tax Rate Reconciliation	For the Years Ended December 31, 2019 2018 2017 Statutory U.S. federal income tax rate 21.0 % 21.0 % 35.0 % State and local income taxes, net of federal benefit 4.5 3.1 4.0 Deemed repatriation of foreign earnings — ( 1.0 ) 3.3 Effect of tax rate changes — ( 5.1 ) 13.5 Meals and entertainment 1.4 1.4 1.4 Other, net 0.6 0.4 ( 0.1 ) Effective tax rate 27.5 % 19.8 % 57.1 %
Schedule Of Income Before Income Tax, Domestic And Foreign	For the Years Ended December 31, Components of Income before Taxes 2019 2018 2017 Domestic $ 185.1 $ 163.3 $ 155.2 Foreign 14.8 15.8 12.3 Income before taxes $ 199.9 $ 179.1 $ 167.5
Schedule Of Components Of Income Tax Expense Benefit	For the Years Ended December 31, Components of Income Tax Provision 2019 2018 2017 Current expense U.S. Federal $ 41.9 $ 20.5 $ 66.5 State 12.4 6.9 11.4 Foreign 4.4 4.6 3.5 Total current expense $ 58.7 $ 32.0 $ 81.4 Deferred (benefit) expense U.S. Federal ( 3.0 ) 2.5 15.3 State ( 0.8 ) 0.8 ( 1.1 ) Foreign 0.1 0.1 — Total deferred (benefit) expense $ ( 3.7 ) $ 3.4 $ 14.2 Total income tax provision $ 55.0 $ 35.4 $ 95.6
Schedule Of Deferred Tax Assets And Liabilities	Assets (Liabilities) 2019 2018 Pension $ 38.7 $ 31.0 Operating lease liabilities 30.6 — Postretirement benefits 19.6 18.6 Inventory 14.9 12.1 Other deferred tax assets 5.0 5.0 Payroll accruals 2.9 2.9 Bad debt reserves 1.0 1.0 Subtotal 112.7 70.6 Less: valuation allowances ( 0.4 ) — Deferred tax assets 112.3 70.6 Fixed assets ( 32.2 ) ( 28.3 ) Operating lease right-of-use assets ( 28.7 ) — Other deferred tax liabilities ( 4.5 ) ( 4.0 ) Computer software ( 2.9 ) ( 3.2 ) Deferred tax liabilities ( 68.3 ) ( 35.5 ) Net deferred tax assets $ 44.0 $ 35.1 Deferred income taxes included in non-current assets (liabilities) at December 31 were: 2019 2018 Deferred tax assets included in other non-current assets $ 44.5 $ 35.5 Deferred tax liabilities included in other non-current liabilities ( 0.5 ) ( 0.4 )
Summary Of Operating Loss Carryforwards	2019 2018 U.S. Federal (A) $ 0.4 $ — State (A) 0.3 0.4 Foreign (B) 0.1 0.1 (A) Expires between 2023 and 2030 (B) Indefinite life

Capital Stock (Tables)

Capital Stock (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Schedule of Common Stock Shares Purchased and Retired	Shares of Common Stock Purchased Retired 2019 962,023 957,495 2018 786,754 752,825 2017 684,347 678,958

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt [Abstract]
Schedule Of Long-term Debt	December 31, Long-term Debt 2019 2018 Finance arrangements, various maturities, with a weighted average interest rate of 6.62 % $ 11.6 $ 13.4 Less current portion ( 3.8 ) ( 3.4 ) Long-term Debt $ 7.8 $ 10.0
Schedule Of Long-term Debt Maturities	Long-term Debt matures as follows: 2020 $ 3.8 2021 2.3 2022 1.7 2023 1.2 2024 1.1 After 2024 1.5 $ 11.6

Pension And Other Postretirem_2

Pension And Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2019
Pension And Other Postretirement Benefits [Abstract]
Schedule Of Net Funded Status	Pension Benefits Postretirement Benefits 2019 2018 2019 2018 Change in Benefit Obligation: Benefit obligation at beginning of period $ 708.8 $ 756.3 $ 72.5 $ 76.8 Service cost 25.6 28.6 2.0 2.3 Interest cost 30.0 27.3 2.9 2.6 Actuarial loss (gain) 117.0 ( 57.7 ) 3.0 ( 5.2 ) Benefits paid from plan assets ( 52.3 ) ( 42.5 ) — — Benefits paid from Company assets ( 1.7 ) ( 1.6 ) ( 5.8 ) ( 5.6 ) Plan participants' contributions — — 1.4 1.6 Administrative expenses paid ( 2.3 ) ( 1.6 ) — — Plan amendments — — 0.2 — Benefit Obligation at End of Period 825.1 708.8 76.2 72.5 Change in Plan Assets: Fair value of plan assets at beginning of period 588.3 585.4 — — Actual return on plan assets 114.7 ( 33.0 ) — — Employer contributions (A) 11.7 81.6 4.4 4.0 Plan participants' contributions — — 1.4 1.6 Benefits paid (A) ( 54.0 ) ( 44.1 ) ( 5.8 ) ( 5.6 ) Administrative expenses paid ( 2.3 ) ( 1.6 ) — — Fair Value of Plan Assets at End of Period 658.4 588.3 — — Unfunded Status $ 166.7 $ 120.5 $ 76.2 $ 72.5 (A) Includes $ 1.7 million and $ 1.6 million paid from our assets for unfunded nonqualified pension benefits in fiscal years 2019 and 2018, respectively.
Schedule Of Amounts Recognized In Balance Sheet	Pension Benefits Postretirement Benefits 2019 2018 2019 2018 Current accrued benefit cost $ 2.1 $ 1.9 $ 6.8 $ 5.8 Non-current accrued benefit cost 164.6 118.6 69.4 66.7 Net amount recognized $ 166.7 $ 120.5 $ 76.2 $ 72.5
Schedule Of Amounts Recognized In Accumulated Other Comprensive Income (Loss)	Pension Benefits Postretirement Benefits 2019 2018 2019 2018 Net actuarial loss $ 232.4 $ 219.6 $ 10.4 $ 8.3 Prior service cost (gain) — — 0.1 — Accumulated other comprehensive loss $ 232.4 $ 219.6 $ 10.5 $ 8.3
Schedule Of Amounts In Accumulated Other Comprehensive Income (Loss) To Be Recognized Over Next Fiscal Year	Pension Benefits Postretirement Benefits Net actuarial loss $ 21.5 $ 0.5 Accumulated other comprehensive loss $ 21.5 $ 0.5
Schedule Of Assumptions Used	Pension Benefits Postretirement Benefits 2019 2018 2019 2018 Discount rate 3.38 % 4.31 % 3.19 % 4.16 % Rate of compensation increase 4.36 % 4.49 % — — Healthcare cost trend on covered charges — — 5.00 % 5.00 %
Schedule Of Net Periodic Benefit Costs	The net periodic benefit cost for the years ended December 31, 2019, 2018, and 2017 included the following components: Pension Benefits Postretirement Benefits Components of Net Periodic Benefit Cost 2019 2018 2017 2019 2018 2017 Selling, general, and administrative expenses: Service cost $ 25.6 $ 28.6 $ 26.4 $ 2.0 $ 2.3 $ 2.3 Total selling, general, and administrative expenses $ 25.6 $ 28.6 $ 26.4 $ 2.0 $ 2.3 $ 2.3 Non-operating expenses: Interest cost 30.0 27.3 27.8 2.9 2.6 2.9 Expected return on plan assets ( 34.1 ) ( 31.9 ) ( 30.6 ) — — — Amortization of: Net actuarial loss 19.1 26.5 21.5 0.3 0.9 0.8 Prior service cost (gain) — 0.3 0.4 — ( 2.0 ) ( 2.2 ) Total non-operating expenses $ 15.0 $ 22.2 $ 19.1 $ 3.2 $ 1.5 $ 1.5 Net periodic benefit cost $ 40.6 $ 50.8 $ 45.5 $ 5.2 $ 3.8 $ 3.8 Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31 were: Pension Benefits Postretirement Benefits 2019 2018 2017 2019 2018 2017 Discount rate 4.31 % 3.67 % 4.15 % 4.16 % 3.44 % 3.78 % Expected return on plan assets 5.75 % 5.75 % 5.75 % — — — Rate of compensation increase 4.36 % 4.49 % 4.52 % — — — Healthcare cost trend on covered charges — — — 5.00 % 5.50 % / 5.00 % 6.00 % / 5.00 %
Schedule Of Expected Benefit Payments	Year Pension Benefits Postretirement Benefits 2020 $ 62.0 $ 6.9 2021 58.3 7.5 2022 58.2 7.7 2023 59.2 7.5 2024 59.1 7.3 2025 to 2029 296.8 33.0
Schedule Of Allocation Of Plan Assets	Investment 2019 Actual Allocation 2019 Target Allocation Range 2018 Actual Allocation 2018 Target Allocation Range Equity securities-U.S. 6 % 3 - 10 % 5 % 3 - 15 % Equity securities-International 9 % 2 - 10 % 8 % 3 - 15 % Fixed income investments 68 % 40 - 80 % 71 % 38 - 85 % Hedge funds 5 % 2 - 8 % 5 % 5 - 15 % Private markets 4 % 0 - 15 % 4 % 3 - 13 % Other investments 8 % 0 - 14 % 7 % 0 - 10 % Short-term investments — % 1 - 10 % — % 0 - 3 % Total 100 % 100 % 100 % 100 %
Schedule Of Changes In Fair Value Of Plan Assets	The following tables set forth, by level within the fair value hierarchy, the Pension Plan assets measured at fair value as of December 31, 2019 and 2018: December 31, 2019 Investment Investments Measured at NAV Level 1 Level 2 Level 3 Total Equity securities - U.S. $ 14.0 $ 26.0 $ — $ — $ 40.0 Equity securities - International 20.7 37.9 — — 58.6 Fixed income investments 312.7 135.2 — — 447.9 Hedge funds 32.0 — — — 32.0 Private markets 17.0 — — 11.0 28.0 Other investments 17.7 20.4 — 11.4 49.5 Short-term investments 2.4 — — — 2.4 Total $ 416.5 $ 219.5 $ — $ 22.4 $ 658.4 December 31, 2018 Investment Investments Measured at NAV Level 1 Level 2 Level 3 Total Equity securities - U.S. $ 10.7 $ 19.3 $ — $ — $ 30.0 Equity securities - International — 47.6 — — 47.6 Fixed income investments 291.7 124.9 — — 416.6 Hedge funds 30.7 — — — 30.7 Private markets 16.3 — — 6.0 22.3 Other investments 18.2 15.9 — 4.4 38.5 Short-term investments 2.6 — — — 2.6 Total $ 370.2 $ 207.7 $ — $ 10.4 $ 588.3 The tables below set forth a summary of changes in the fair value of the Pension Plan's Level 3 assets for the years ended December 31, 2019 and 2018: December 31, 2019 Private Markets Other Investments Total Balance, beginning of year $ 6.0 $ 4.4 $ 10.4 Realized gains 0.1 — 0.1 Unrealized gains 0.7 0.8 1.5 Purchases 4.4 6.8 11.2 Sales ( 0.2 ) ( 0.6 ) ( 0.8 ) Balance, end of year $ 11.0 $ 11.4 $ 22.4 December 31, 2018 Private Markets Other Investments Total Balance, beginning of year $ 3.8 $ 3.9 $ 7.7 Realized gains 0.1 — 0.1 Purchases 3.2 0.9 4.1 Sales ( 1.1 ) ( 0.4 ) ( 1.5 ) Balance, end of year $ 6.0 $ 4.4 $ 10.4

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2019
Accumulated Other Comprehensive Loss [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	2019 2018 Currency translation $ ( 7.7 ) $ ( 12.4 ) Pension liability ( 232.4 ) ( 219.6 ) Postretirement benefits liability ( 10.5 ) ( 8.3 ) Accumulated other comprehensive loss $ ( 250.6 ) $ ( 240.3 )
Reclassification out of Accumulated Other Comprehensive Income (Loss)	2019 2018 Amortization of Pension and Other Postretirement Benefits Items Amortization of Pension and Other Postretirement Benefits Items Actuarial Losses Recognized Prior Service Costs Recognized Total Actuarial Losses Recognized Prior Service Costs Recognized Total Affected Line in Consolidated Statement of Income: Non-operating expenses $ 19.4 $ — $ 19.4 $ 27.4 $ ( 1.7 ) $ 25.7 Tax (benefit) expense ( 5.0 ) — ( 5.0 ) ( 7.0 ) 0.4 ( 6.6 ) Total reclassifications for the period, net of tax $ 14.4 $ — $ 14.4 $ 20.4 $ ( 1.3 ) $ 19.1
Changes in Accumlated Other Comprehensive Income (Loss)	2019 2018 Foreign Currency Pension and Other Postretirement Benefits Total Foreign Currency Pension and Other Postretirement Benefits Total Beginning balance January 1, $ ( 12.4 ) $ ( 227.9 ) $ ( 240.3 ) $ ( 4.6 ) $ ( 245.5 ) $ ( 250.1 ) Other comprehensive income (loss) before reclassifications 4.7 — 4.7 ( 7.8 ) — ( 7.8 ) Amounts reclassified from accumulated other comprehensive loss (net of tax $( 5.0 ) and $( 6.6 )) — 14.4 14.4 — 19.1 19.1 Actuarial loss, (net of tax $ 10.2 and $ 0.5 ) — ( 29.4 ) ( 29.4 ) — ( 1.5 ) ( 1.5 ) Net current-period other comprehensive income (loss) 4.7 ( 15.0 ) ( 10.3 ) ( 7.8 ) 17.6 9.8 Ending balance December 31, $ ( 7.7 ) $ ( 242.9 ) $ ( 250.6 ) $ ( 12.4 ) $ ( 227.9 ) $ ( 240.3 )

Quarterly Financial Informati_2

Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information (Unaudited) [Abstract]
Schedule of Quarterly Financial Information (Unaudited)	2019 For the Quarter Ended March 31, June 30, September 30, December 31, Net sales $ 1,777.8 $ 1,948.0 $ 1,981.4 $ 1,816.7 Gross margin $ 338.7 $ 367.7 $ 377.8 $ 344.8 Net income attributable to the Company $ 34.3 $ 47.0 $ 48.8 $ 14.4 Net income attributable to the Company per share of common stock (A) $ 1.51 $ 2.08 $ 2.17 $ 0.65 (A) All periods adjusted for a 5 % stock dividend declared in December 2019. Prior to these adjustments, the average common shares outstanding for the first, second, third, and fourth quarters of 2019 were 21,616,141 shares, 21,513,493 shares, 21,449,751 shares, and 21,390,053 shares, respectively. 2018 For the Quarter Ended March 31, June 30, September 30, December 31, Net sales $ 1,637.7 $ 1,832.3 $ 1,870.3 $ 1,862.2 Gross margin $ 311.4 $ 351.2 $ 353.4 $ 364.9 Net income attributable to the Company $ 21.1 $ 44.5 $ 53.6 $ 24.1 Net income attributable to the Company per share of common stock (A) $ 0.93 $ 1.98 $ 2.38 $ 1.08 (A) All periods adjusted for a 5 % stock dividend declared in December 2019 and a 10 % stock dividend declared in December 2018. Prior to these adjustments, the average common shares outstanding for the first, second, third, and fourth quarters of 2018 were 19,544,758 shares, 19,500,916 shares, 19,465,072 shares, and 19,454,943 shares, respectively.

Summary Of Significant Accoun_4

Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Concentration Risk [Line Items]
Cost of merchandise sold	$ 6,094.9	$ 5,821.6	$ 5,369.9
Operating lease right-of-use assets	117.5
Operating lease liabilities	$ 124.8
Accounting Standards Update 2016-02 [Member]
Concentration Risk [Line Items]
Operating lease right-of-use assets				$ 91.8
Operating lease liabilities				$ 98.1
Minimum
Concentration Risk [Line Items]
Amortization period	3 years
Maximum
Concentration Risk [Line Items]
Amortization period	20 years
Outgoing Freight Expenses [Member]
Concentration Risk [Line Items]
Cost of merchandise sold	$ 68.5	$ 65.7	$ 57.7
Sales revenue | Services | Maximum
Concentration Risk [Line Items]
Concentration percentage	1.00%
Freight Expenses As Selling, General And Administrative Expenses [Member] | Outgoing Freight Expenses [Member]
Concentration Risk [Line Items]
Concentration percentage	95.00%

Summary Of Significant Accoun_5

Summary Of Significant Accounting Policies (Schedule of Prospective Adoption of New Accounting Pronouncements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selling, general and administrative expenses	$ 1,159.9	$ 1,125	$ 1,026.6
Non-operating expenses	$ 23.7	$ 30.6	24.8
As Reported
Selling, general and administrative expenses			1,047.2
Non-operating expenses			4.2
Reclassification
Selling, general and administrative expenses			(20.6)
Non-operating expenses			$ 20.6

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ in Millions	Jan. 01, 2018	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales		$ 1,816.7	$ 1,981.4	$ 1,948	$ 1,777.8	$ 1,862.2	$ 1,870.3	$ 1,832.3	$ 1,637.7	$ 7,523.9	$ 7,202.5	$ 6,631.2
Increase in retained earnings		694				678.1				694	678.1
Total income tax provision										55	35.4	$ 95.6
Contract asset (liabilites)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales											0.2
Increase in retained earnings	$ 0.8					$ 0.9					$ 0.9
Total income tax provision	$ (0.3)

Revenue (Schedule of New Accoun

Revenue (Schedule of New Accounting Pronouncements) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Item Effected [Line Items]
Net sales	$ 1,816.7	$ 1,981.4	$ 1,948	$ 1,777.8	$ 1,862.2	$ 1,870.3	$ 1,832.3	$ 1,637.7	$ 7,523.9	$ 7,202.5	$ 6,631.2
Cost of merchandise sold									6,094.9	5,821.6	$ 5,369.9
Merchandise inventory	654.2				658.7				654.2	658.7
Other current assets	51.7				54.1				51.7	54.1
Other non-current liabilities	2.3				8.7				2.3	8.7
Retained Earnings	$ 694				678.1				$ 694	678.1
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Item Effected [Line Items]
Net sales										7,202.3
Cost of merchandise sold										5,821.6
Merchandise inventory					668.2					668.2
Other current assets					54.4					54.4
Other non-current liabilities					19.4					19.4
Retained Earnings					677.2					677.2
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Item Effected [Line Items]
Net sales										0.2
Merchandise inventory					(9.5)					(9.5)
Other current assets					(0.3)					(0.3)
Other non-current liabilities					(10.7)					(10.7)
Retained Earnings					$ 0.9					$ 0.9		$ 0.8

Revenue (Disaggregation Of Reve

Revenue (Disaggregation Of Revenue) (Details) - Revenue from Contract with Customer [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total net sales	100.00%	100.00%	100.00%
Construction
Disaggregation of Revenue [Line Items]
Total net sales	60.10%	59.70%	58.70%
Industrial & Utility
Disaggregation of Revenue [Line Items]
Total net sales	20.60%	20.80%	21.10%
CIG
Disaggregation of Revenue [Line Items]
Total net sales	19.30%	19.50%	20.20%

Cash Discounts And Doubtful A_3

Cash Discounts And Doubtful Accounts (Schedule of Cash Discounts and Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 5.9	$ 6	$ 5
Provision (Charged to Expense)	42.8	36.1	34.8
Deductions	(42.5)	(36.2)	(33.8)
Ending Balance	6.2	5.9	6
Allowance for cash discounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	2.2	2	1.7
Provision (Charged to Expense)	35.8	33.2	31.2
Deductions	(35.8)	(33)	(30.9)
Ending Balance	2.2	2.2	2
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	3.7	4	3.3
Provision (Charged to Expense)	7	2.9	3.6
Deductions	(6.7)	(3.2)	(2.9)
Ending Balance	$ 4	$ 3.7	$ 4

Inventory (Narrative) (Details)

Inventory (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Percentage of LIFO Inventory	90.00%	91.00%
Excess of Replacement or Current Costs over Stated LIFO Value	$ 186.5	$ 188.8
Inventory, LIFO Reserve, Effect on Income, Net	0	0
Inventory Valuation Reserves	9.2	7.8
Inventory Valuation Reserve
Inventory [Line Items]
Reserves for Obsolete Inventories, Period Increase (Decrease)	$ 1.4	$ (1.4)	$ 2.7

Property And Depreciation (Sche

Property And Depreciation (Schedule Of Property And Depreciation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation	$ 36.1	$ 37.3	$ 38.8
Losses on impairment of assets	$ 0.3	0.3
Building
Property, Plant and Equipment [Line Items]
Estimated useful asset life	42 years
Losses on impairment of assets	$ 0	0.3	0
Furniture, Fixtures & Equipment and Software [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful asset life	3 years
Furniture, Fixtures & Equipment and Software [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful asset life	14 years
Software and Software Development Costs
Property, Plant and Equipment [Line Items]
Property plant and equipment additions	$ 3	3.7
Assets Held under Capital Leases
Property, Plant and Equipment [Line Items]
Property plant and equipment additions	2	3.1
Capitalized Interest Costs
Property, Plant and Equipment [Line Items]
Interest costs capitalized	$ 0.2	$ 0.3	$ 0.1

Leases (Narrative) (Details)

Leases (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019
Operating lease liabilities	$ 124.8
Operating lease right-of-use assets	117.5
Finance lease, net	$ 8.4
Accounting Standards Update 2016-02 [Member]
Operating lease liabilities		$ 98.1
Operating lease right-of-use assets		$ 91.8

Leases (Schedule Of Lease Expen

Leases (Schedule Of Lease Expense) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 33.9
Amortization of right-of-use assets	2.2
Interest on lease liabilities	0.7
Total finance lease cost	2.9
Variable lease cost	9.5
Total lease cost	$ 46.3

Leases (Schedule Of Supplementa

Leases (Schedule Of Supplemental Balance Sheet Information) (Details) $ in Millions	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 117.5
Current operating lease liabilities	28.6
Non-current operating lease liabilities	96.2
Total operating lease liabilities	124.8
Property, at cost	18.3
Less - accumulated depreciation and amortization	9.9
Net property	8.4
Current obligations of finance leases	2.1
Finance leases, net of current obligations	7.8
Total finance lease liabilities	$ 9.9
Weighted average remaining lease term, Operating leases	5 years
Weighted average remaining lease term, Finance leases	5 years 1 month 6 days
Weighted average discount rate, Operating leases	3.30%
Weighted average discount rate, Finance leases	7.00%

Leases (Schedule Of Supplemen_2

Leases (Schedule Of Supplemental Cash Flow And Other Information) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 33.5
Operating cash flows from finance leases	0.7
Financing cash flows from finance leases	2.1
Right-of-use assets obtained in exchange for lease liabilities, Operating leases	55.9
Right-of-use assets obtained in exchange for lease liabilities, Finance leases	$ 2

Leases (Schedule Of Maturity Of

Leases (Schedule Of Maturity Of Lease Liabilities) (Details) $ in Millions	Dec. 31, 2019USD ($)
Leases [Abstract]
2020, Operating Leases	$ 32.2
2021, Operating Leases	29.4
2022, Operating Leases	23.6
2023, Operating Leases	18.2
2024, Operating Leases	13.4
Thereafter, Operating Leases	19
Total future minimum lease payments, Operating Leases	135.8
Less: imputed interest, Operating Leases	(11)
Total operating lease liabilities	124.8
Less: current obligations, Operating Leases	(28.6)
Long-term lease obligation, Operating Leases	96.2
2020, Finance Leases	2.7
2021, Finance Leases	2.7
2022, Finance Leases	2.1
2023, Finance Leases	1.5
2024, Finance Leases	1.3
Thereafter, Finance Leases	1.7
Total future minimum lease payments, Finance Leases	12
Less: imputed interest, Finance Leases	(2.1)
Total finance lease liabilities	9.9
Less: current obligations, Finance Leases	(2.1)
Long-term lease obligation, Finance Leases	$ 7.8

Goodwill And Other Intangible_3

Goodwill And Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning Balance	$ 30.1	$ 30.1
Ending Balance	$ 30.1	$ 30.1

Goodwill And Other Intangible_4

Goodwill And Other Intangible Assets (Schedule Of Finite Lived Intangible Assets) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 31,400,000	$ 31,900,000
Accumulated Amortization	(9,900,000)	(7,400,000)
Total Net Carrying Amount	21,500,000	24,500,000
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,700,000	17,100,000
Accumulated Amortization	(6,700,000)	(5,000,000)
Total Net Carrying Amount	10,000,000	$ 12,100,000
Incurred loss	$ 500,000
Customer Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	8 years 6 months	8 years 6 months
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	10 years 9 months 18 days	10 years 9 months 18 days
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 14,300,000	$ 14,300,000
Accumulated Amortization	(2,800,000)	(2,100,000)
Total Net Carrying Amount	$ 11,500,000	$ 12,200,000
Trade Names | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	15 years	15 years
Trade Names | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	20 years	20 years
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 300,000	$ 300,000
Accumulated Amortization	$ (300,000)	(200,000)
Total Net Carrying Amount		$ 100,000
Noncompete Agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	3 years	3 years
Noncompete Agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	5 years	5 years
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 100,000	$ 200,000
Accumulated Amortization	$ (100,000)	(100,000)
Total Net Carrying Amount		100,000
Weighted-average useful lives (in years)	10 years
Incurred loss		0
Amortization expense	$ 2,500,000	$ 2,600,000	$ 2,600,000

Goodwill And Other Intangible_5

Goodwill And Other Intangible Assets (Finite Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Other Intangible Assets [Abstract]
2020	$ 2.4
2021	2.4
2022	2.4
2023	2.4
2024	2.4
After 2024	9.5
Total Net Carrying Amount	$ 21.5	$ 24.5

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit)	$ 55	$ 35.4	$ 95.6
Statutory federal tax rate	21.00%	21.00%	35.00%
Provisional tax expense			$ 22.6
Provisional tax expense previously recorded through AOCI			43.5
Provisional tax benefit recorded previously			20.9
Decrease in tax expense		$ 9.2
One-time transition tax liability			6.2
Decrease in income tax expense		2.4
Unrecognized tax benefits	$ 1.9	$ 2.6	$ 2.3
Accrued interest and penalties	0.4
State and Local Jurisdiction [Member]
Valuation allowance	0.1
Domestic Tax Authority [Member]
Valuation allowance	$ 0.4

Income Taxes (Schedule Of Unrec

Income Taxes (Schedule Of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1:	$ 2.6	$ 2.3	$ 1.8
Additions based on tax positions related to current year	0.2	1.1	0.4
Additions based on tax positions of prior years			0.3
Reductions for tax positions of prior years	(0.1)	(0.8)	(0.2)
Settlements	(0.8)
Balance at December 31:	$ 1.9	$ 2.6	$ 2.3

Income Taxes (Schedule Of Effec

Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal tax rate	21.00%	21.00%	35.00%
State and local income taxes, net of federal benefit	4.50%	3.10%	4.00%
Deemed repatriation of foreign earnings		(1.00%)	3.30%
Effect of tax rate changes		(5.10%)	13.50%
Meals and entertainment	1.40%	1.40%	1.40%
Other, net	0.60%	0.40%	(0.10%)
Effective tax rate	27.50%	19.80%	57.10%

Income Taxes (Schedule Of Incom

Income Taxes (Schedule Of Income Before Income Tax, Domestic And Foreign) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Income before Income Taxes, Domestic	$ 185.1	$ 163.3	$ 155.2
Income before Income Taxes, Foreign	14.8	15.8	12.3
Income before Provision for Income Taxes	$ 199.9	$ 179.1	$ 167.5

Income Taxes (Schedule of Compo

Income Taxes (Schedule of Components Of Income Tax Expense Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Provisions for Income Taxes Recorded in the Consolidated Statements of Income [Abstract]
U.S. Federal, current expense	$ 41.9	$ 20.5	$ 66.5
State, current expense	12.4	6.9	11.4
Foreign, current expense	4.4	4.6	3.5
Total current expense	58.7	32	81.4
U.S. Federal, deferred expense	(3)	2.5	15.3
State, deferred expense	(0.8)	0.8	(1.1)
Foreign, deferred expense	0.1	0.1
Total deferred (benefit) expense	(3.7)	3.4	14.2
Total income tax provision	$ 55	$ 35.4	$ 95.6

Income Taxes (Schedule Of Defer

Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Components of Deferred Tax Assets and Liabilities [Abstract]
Pension	$ 38.7	$ 31
Operating lease liabilities	30.6
Postretirement benefits	19.6	18.6
Inventory	14.9	12.1
Other deferred tax assets	5	5
Payroll accruals	2.9	2.9
Bad debt reserves	1	1
Subtotal	112.7	70.6
less: valuation allowances	(0.4)
Deferred tax assets	112.3	70.6
Fixed assets	(32.2)	(28.3)
Operating lease right-of-use assets	(28.7)
Other deferred tax liabilities	(4.5)	(4)
Computer software	(2.9)	(3.2)
Deferred tax liabilities	(68.3)	(35.5)
Net deferred tax assets	44	35.1
Deferred Tax Assets, Net, Classification [Abstract]
Deferred tax assets, included in other non-current assets	44.5	35.5
Deferred tax liabilities included in other non-current liabilities	$ (0.5)	$ (0.4)

Income Taxes (Summary Of Operat

Income Taxes (Summary Of Operating Loss Carryforwards) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
U.S. Federal	$ 0.4
State	0.3	$ 0.4
Foreign	$ 0.1	$ 0.1

Capital Stock (Par Value Of Sto

Capital Stock (Par Value Of Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Stockholders' Equity Note, Percent of Entity Owned by Current and Retired Employees	100.00%
Common Stock, Shares, Issued, Voting Trustees	18,665,064	17,754,923
Common stock stated value per share (USD per share)	$ 20	$ 20
Payments of Ordinary Dividends, Common Stock	$ 107.2	$ 46.9	$ 35.4
Common stock, subscriptions ( in shares)	997,275
Common shares subscribed (in dollars)	$ 19.9
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Shares of common stock purchased	962,023	786,754	684,347
Shares of common stock retired	957,495	752,825	678,958
Preferred stock shares authorized	10,000,000	10,000,000
Preferred stock par or stated value per share (USD per share)	$ 0.01	$ 0.01
Preferred stock outstanding (in shares)	0	0
Common stock dividend declared, percent	5.00%	10.00%	10.00%
2017 Voting Trust | Common Stock
Class of Stock [Line Items]
Percentage Ownership in Voting Trust	83.00%

Net Income Per Share Of Commo_2

Net Income Per Share Of Common Stock (Narrative) (Details) - shares	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Income Per Share Of Common Stock [Abstract]
Common stock dividend declared, percent									5.00%	10.00%	10.00%
Average shares outstanding	21,390,053	21,449,751	21,513,493	21,616,141	19,454,943	19,465,072	19,500,916	19,544,758	22,555,240	22,507,701	22,368,941

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($)	Aug. 10, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Fixed rate debt carrying amount in excess of fair value		$ 1,400,000	$ 1,500,000
Short-term borrowings		$ 138,000,000	235,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Weighted average interest rate		2.78%
Letter of Credit
Line of Credit Facility [Line Items]
Letters of credit outstanding		$ 5,600,000	5,600,000
Credit Agreement [Member] | Revolving Credit Facility
Line of Credit Facility [Line Items]
Remaining borrowing capacity		611,500,000	515,000,000
Short-term borrowings		138,000,000	235,000,000
Short-term debt average amount outstanding		$ 151,000,000	$ 202,000,000
Weighted average interest rate		3.42%	3.05%
Debt instrument interest expense		$ 5,500,000	$ 6,900,000	$ 4,200,000
Credit Agreement [Member] | Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Short-term borrowings		10,000,000	140,000,000
Credit Agreement [Member] | Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Short-term borrowings		$ 257,000,000	261,000,000
Amended Credit Agreement
Line of Credit Facility [Line Items]
Debt Instrument, Term		5 years
Letters of credit outstanding		$ 500,000	0
Prudential Private Placement Shelf Agreement
Line of Credit Facility [Line Items]
Agreement face amount		100,000,000
Notes issued face amount		0	0
MetLife Private Placement Shelf Agreement
Line of Credit Facility [Line Items]
Agreement face amount		100,000,000
Notes issued face amount		$ 0	$ 0
Line of credit | Revolving Credit Facility | Graybar Canada [Member] | Minimum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Line of credit | Revolving Credit Facility | Graybar Canada [Member] | Maximum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.60%
Line of credit | Credit Agreement [Member] | Bridge Loan | UNITED STATES
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 75,000,000
Line of credit | Amended Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity	750,000,000
Line of credit | Amended Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Accordion Feature, Increase Limit	$ 375,000,000
Line of credit | Amended Credit Agreement | Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Credit agreement commitment fee percentage	0.25%
Line of credit | Amended Credit Agreement | Revolving Credit Facility | Minimum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Line of credit | Amended Credit Agreement | Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Line of credit | Amended Credit Agreement | Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Credit agreement commitment fee percentage	0.40%
Line of credit | Amended Credit Agreement | Revolving Credit Facility | Maximum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.60%
Line of credit | Amended Credit Agreement | Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.60%
Line of credit | Amended Credit Agreement | Revolving Credit Facility | Graybar Canada [Member] | Minimum | CDOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Line of credit | Amended Credit Agreement | Revolving Credit Facility | Graybar Canada [Member] | Maximum | CDOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.60%
Line of credit | Amended Credit Agreement | Letter of Credit Sub-Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 25,000,000
Line of credit | Amended Credit Agreement | Bridge Loan | Graybar Canada [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	100,000,000
Line of credit | Amended Credit Agreement | Bridge Loan | CANADA
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 20,000,000
Line of credit | Amended Credit Agreement | Letter of Credit | Minimum
Line of Credit Facility [Line Items]
Credit agreement commitment fee percentage	1.00%
Line of credit | Amended Credit Agreement | Letter of Credit | Maximum
Line of Credit Facility [Line Items]
Credit agreement commitment fee percentage	1.60%

Debt (Schedule Of Long-term Deb

Debt (Schedule Of Long-term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total	$ 11.6
Less current portion	(3.8)	$ (3.4)
Long-term Debt	7.8	10
Capital leases, various maturities, with a weighted average interest rate of 6.16%
Debt Instrument [Line Items]
Total	$ 11.6	$ 13.4
Weighted average interest rate	6.62%	6.62%

Debt (Schedule Of Long-term D_2

Debt (Schedule Of Long-term Debt Maturities) (Details) $ in Millions	Dec. 31, 2019USD ($)
Long-term Debt matures as follows:
2020	$ 3.8
2021	2.3
2022	1.7
2023	1.2
2024	1.1
After 2024	1.5
Total	$ 11.6

Pension And Other Postretirem_3

Pension And Other Postretirement Benefits Benefit Obligation (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Vesting percentage		100.00%
Required term of service to be eligible for plan match	one year of service and 1,000 hours
Award vesting period		3 years
Estimated nonqualified benefits in next fiscal year		$ 1.8
Estimated future employer contributions in next fiscal year		40
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer		11.7	$ 81.6
Accumulated benefit obligation		746.8	636.3
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 4.4	$ 4

Pension And Other Postretirem_4

Pension And Other Postretirement Benefits Benefit Obligation (Schedule Of Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	$ 588.3
Balance, end of year	658.4	$ 588.3
Paid from Company assets for unfunded nonqualified benefits	1.7	1.6
Pension Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of period	708.8	756.3
Service cost	25.6	28.6	$ 26.4
Interest cost	30	27.3	27.8
Actuarial loss (gain)	117	(57.7)
Benefits paid from plan assets	(52.3)	(42.5)
Benefits paid from Company assets	(1.7)	(1.6)
Plan participants' contributions
Administrative expenses paid	(2.3)	(1.6)
Plan amendments
Benefit obligation, end of period	825.1	708.8	756.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	588.3	585.4
Actual return on plan assets	114.7	(33)
Employer contributions	11.7	81.6
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant
Benefits paid	(54)	(44.1)
Administrative expenses paid	(2.3)	(1.6)
Balance, end of year	658.4	588.3	585.4
Unfunded status	166.7	120.5
Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of period	72.5	76.8
Service cost	2	2.3	2.3
Interest cost	2.9	2.6	2.9
Actuarial loss (gain)	3	(5.2)
Benefits paid from plan assets
Benefits paid from Company assets	(5.8)	(5.6)
Plan participants' contributions	1.4	1.6
Administrative expenses paid
Plan amendments	0.2
Benefit obligation, end of period	76.2	72.5	76.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year
Actual return on plan assets
Employer contributions	4.4	4
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	1.4	1.6
Benefits paid	(5.8)	(5.6)
Administrative expenses paid
Balance, end of year
Unfunded status	$ 76.2	$ 72.5

Pension And Other Postretirem_5

Pension And Other Postretirement Benefits (Schedule Of Amounts Recognized In Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Liability, Defined Benefit Plan [Abstract]
Current accrued benefit cost	$ 2.1	$ 1.9
Non-current accrued benefit cost	164.6	118.6
Net amount recognized	166.7	120.5
Postretirement Benefits
Liability, Defined Benefit Plan [Abstract]
Current accrued benefit cost	6.8	5.8
Non-current accrued benefit cost	69.4	66.7
Net amount recognized	$ 76.2	$ 72.5

Pension And Other Postretirem_6

Pension And Other Postretirement Benefits (Schedule Of Amounts Recognized In Accumulated Other Comprensive Income (Loss)) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Net actuarial loss	$ 232.4	$ 219.6
Accumulated other comprehensive loss	232.4	219.6
Postretirement Benefits
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Net actuarial loss	10.4	8.3
Prior service cost (gain)	0.1
Accumulated other comprehensive loss	$ 10.5	$ 8.3

Pension And Other Postretirem_7

Pension And Other Postretirement Benefits (Schedule Of Amounts In Accumulated Other Comprehensive Income (Loss) To Be Recognized Over Next Fiscal Year) (Details) $ in Millions	Dec. 31, 2019USD ($)
Pension Benefits
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net actuarial loss	$ 21.5
Accumulated other comprehensive loss	21.5
Postretirement Benefits
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net actuarial loss	0.5
Accumulated other comprehensive loss	$ 0.5

Pension And Other Postretirem_8

Pension And Other Postretirement Benefits (Schedule Of Assumptions Used) (Details)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Healthcare cost trend on covered charges	5.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Actuarial Present Value		5.00%
Pension Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate		3.38%	4.31%
Rate of compensation increase		4.36%	4.49%
Postretirement Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate		3.19%	4.16%
Defined Benefit Plan, Healthcare cost trend on covered charges		5.00%	5.00%

Pension And Other Postretirem_9

Pension And Other Postretirement Benefits (Schedule Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Total selling, general, and administrative expenses	$ 1,159.9	$ 1,125	$ 1,026.6
Total non-operating expenses	23.7	30.6	24.8
Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	25.6	28.6	26.4
Total selling, general, and administrative expenses	25.6	28.6	26.4
Interest cost	30	27.3	27.8
Expected return on plan assets	(34.1)	(31.9)	(30.6)
Net actuarial loss	19.1	26.5	21.5
Prior service cost (gain)		0.3	0.4
Total non-operating expenses	15	22.2	19.1
Net periodic benefit cost	$ 40.6	$ 50.8	$ 45.5
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.31%	3.67%	4.15%
Expected return on plan assets	5.75%	5.75%	5.75%
Rate of compensation increase	4.36%	4.49%	4.52%
Postretirement Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 2	$ 2.3	$ 2.3
Total selling, general, and administrative expenses	2	2.3	2.3
Interest cost	2.9	2.6	2.9
Net actuarial loss	0.3	0.9	0.8
Prior service cost (gain)		(2)	(2.2)
Total non-operating expenses	3.2	1.5	1.5
Net periodic benefit cost	$ 5.2	$ 3.8	$ 3.8
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.16%	3.44%	3.78%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Net Periodic Benefit Cost		5.50%	6.00%
Defined Benefit Plan Ultimate Health Care Cost Trend Rate For Benefit Obligation, Net Periodic Benefit Cost		5.00%	5.00%

Pension And Other Postretire_10

Pension And Other Postretirement Benefits (Schedule Of Expected Benefit Payments) (Details) $ in Millions	Dec. 31, 2019USD ($)
Pension Benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2020	$ 62
2021	58.3
2022	58.2
2023	59.2
2024	59.1
2025 to 2029	296.8
Postretirement Benefits
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2020	6.9
2021	7.5
2022	7.7
2023	7.5
2024	7.3
2025 to 2029	$ 33

Pension And Other Postretire_11

Pension And Other Postretirement Benefits (Schedule Of Allocation Of Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	100.00%	100.00%
Defined Benefit Plan, Target Allocation Percentage	100 %	100 %
Equity Securities - U.S.
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	6.00%	5.00%
Equity Securities - International
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	9.00%	8.00%
Fixed Income Investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	68.00%	71.00%
Hedge Funds
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	5.00%	5.00%
Private Markets
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	4.00%	4.00%
Other Investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	8.00%	7.00%
Minimum | Equity Securities - U.S.
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	3	3
Minimum | Equity Securities - International
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	2	3
Minimum | Fixed Income Investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	40	38
Minimum | Hedge Funds
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	2	5
Minimum | Private Markets
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	0	3
Minimum | Other Investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	0	0
Minimum | Short-term Investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	1	0
Maximum | Equity Securities - U.S.
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	10	15
Maximum | Equity Securities - International
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	10	15
Maximum | Fixed Income Investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	80	85
Maximum | Hedge Funds
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	8	15
Maximum | Private Markets
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	15	13
Maximum | Other Investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	14	10
Maximum | Short-term Investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Target Allocation Percentage	10	3

Pension And Other Postretire_12

Pension And Other Postretirement Benefits (Schedule Of Changes In Fair Value Of Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	$ 588.3	$ 588.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	588.3
Balance, end of year	658.4	588.3
Investments Measured at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	370.2	370.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	370.2
Balance, end of year	416.5	370.2
Quoted Prices in Active Markets for Identical Inputs (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	207.7	207.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	207.7
Balance, end of year	219.5	207.7
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	10.4	7.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	10.4	7.7
Realized gains/(losses)	0.1	0.1
Unrealized gains/(losses)	1.5
Purchases	11.2	4.1
Sales	(0.8)	(1.5)
Balance, end of year	22.4	10.4
Equity Securities - U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	30	30
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	30
Balance, end of year	40	30
Equity Securities - U.S. | Investments Measured at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	10.7	10.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	10.7
Balance, end of year	14	10.7
Equity Securities - U.S. | Quoted Prices in Active Markets for Identical Inputs (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	19.3	19.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	19.3
Balance, end of year	26	19.3
Equity Securities - International
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	47.6	47.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	47.6
Balance, end of year	58.6	47.6
Equity Securities - International | Investments Measured at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	20.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, end of year	20.7
Equity Securities - International | Quoted Prices in Active Markets for Identical Inputs (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	47.6	47.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	47.6
Balance, end of year	37.9	47.6
Fixed Income Investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	416.6	416.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	416.6
Balance, end of year	447.9	416.6
Fixed Income Investments | Investments Measured at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	291.7	291.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	291.7
Balance, end of year	312.7	291.7
Fixed Income Investments | Quoted Prices in Active Markets for Identical Inputs (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	124.9	124.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	124.9
Balance, end of year	135.2	124.9
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	30.7	30.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	30.7
Balance, end of year	32	30.7
Hedge Funds | Investments Measured at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	30.7	30.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	30.7
Balance, end of year	32	30.7
Private Markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	22.3	22.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	22.3
Balance, end of year	28	22.3
Private Markets | Investments Measured at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	16.3	16.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	16.3
Balance, end of year	17	16.3
Private Markets | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	11	3.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	6	3.8
Realized gains/(losses)	0.1	0.1
Unrealized gains/(losses)	0.7
Purchases	4.4	3.2
Sales	(0.2)	(1.1)
Balance, end of year	11	6
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	38.5	38.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	38.5
Balance, end of year	49.5	38.5
Other Investments | Investments Measured at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	18.2	18.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	18.2
Balance, end of year	17.7	18.2
Other Investments | Quoted Prices in Active Markets for Identical Inputs (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	15.9	15.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	15.9
Balance, end of year	20.4	15.9
Other Investments | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	4.4	4.4
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	4.4	3.9
Realized gains/(losses)
Unrealized gains/(losses)	0.8
Purchases	6.8	0.9
Sales	(0.6)	(0.4)
Balance, end of year	11.4	4.4
Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	2.6	2.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	2.6
Balance, end of year	2.4	2.6
Short-term Investments | Investments Measured at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets measured at net asset value	2.6	2.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance, beginning of year	2.6
Balance, end of year	$ 2.4	$ 2.6

Profit Sharing And Savings Pl_2

Profit Sharing And Savings Plan (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended			48 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Required term of service to be eligible for plan match	six months of service and 500 hours				one year of service and 1,000 hours
Profit Sharing and Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Voluntary contribution, minimum percent of employee pay		2.00%
Voluntary contribution, maximum percent of employee pay		50.00%
Percentage of employee contribution matched by employer		50.00%
Percent of employee pay eligible for matching contributions		6.00%
Employer matching contribution percentage maximum of pay		3.00%
Employer Matching Contribution		$ 2.7	$ 1.8	$ 0.7
Discretionary Employer Contribution		$ 56.8	$ 67.4	$ 43.2

Commitments And Contingencies (

Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments And Contingencies [Abstract]
Rent expense	$ 36.4	$ 29.4	$ 27.3

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of ASU 2018-02	$ (0.8)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of ASU 2018-02		$ 43.5

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency translation	$ (7.7)	$ (12.4)
Adoption of ASU 2018-02		(0.8)
Accumulated Other Comprehensive Loss	(250.6)	(240.3)
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	(7.7)	(12.4)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	(242.9)	(227.9)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of ASU 2018-02			$ 43.5
Accumulated Other Comprehensive Loss	(250.6)	(240.3)
Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Benefits liability	(232.4)	(219.6)
Accumulated Other Comprehensive Loss	(232.4)	(219.6)
Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Benefits liability	$ (10.5)	$ (8.3)

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Loss (Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Non-operating expenses	$ 23.7	$ 30.6	$ 24.8
Tax (benefit) expense	55	35.4	95.6
Total reclassifications for the period, net of tax	(144.9)	(143.7)	(71.9)
AOCI Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total reclassifications for the period, net of tax
Reclassification out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Non-operating expenses	19.4	25.7
Tax (benefit) expense	(5)	(6.6)
Total reclassifications for the period, net of tax	14.4	19.1
Reclassification out of AOCI | Actuarial Losses Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Non-operating expenses	19.4	27.4
Tax (benefit) expense	(5)	(7)
Total reclassifications for the period, net of tax	$ 14.4	20.4
Reclassification out of AOCI | Prior Service Costs Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Non-operating expenses		(1.7)
Tax (benefit) expense		0.4
Total reclassifications for the period, net of tax		$ (1.3)

Accumulated Other Comprehensi_6

Accumulated Other Comprehensive Loss (Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	$ 866.6
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 0.8
Ending Balance December 31,	892.9	866.6
Amounts reclassified from accumulated other comprehensive loss, tax	(5)	(6.6)
Actuarial loss, tax	10.2	0.5
Foreign Currency
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	(12.4)	(4.6)
Other comprehensive (loss) income before reclassifications	4.7	(7.8)
Amounts reclassified from accumulated other comprehensive loss (net of tax $(6.6) and $(8.0))
Actuarial loss, (net of tax $0.5 and $18.0)
Net current-period other comprehensive (loss) income	4.7	(7.8)
Ending Balance December 31,		(12.4)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	(227.9)	(245.5)
Other comprehensive (loss) income before reclassifications
Amounts reclassified from accumulated other comprehensive loss (net of tax $(6.6) and $(8.0))	14.4	19.1
Actuarial loss, (net of tax $0.5 and $18.0)	(29.4)	(1.5)
Net current-period other comprehensive (loss) income	(15)	17.6
Ending Balance December 31,		(227.9)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance January 1,	(240.3)	(250.1)
Other comprehensive (loss) income before reclassifications	4.7	(7.8)
Amounts reclassified from accumulated other comprehensive loss (net of tax $(6.6) and $(8.0))	14.4	19.1
Actuarial loss, (net of tax $0.5 and $18.0)	(29.4)	(1.5)
Net current-period other comprehensive (loss) income	$ (10.3)	9.8
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ (43.5)
Ending Balance December 31,		$ (240.3)

Quarterly Financial Informati_3

Quarterly Financial Information (Unaudited) (Schedule Of Quarterly Financial Information (Unaudited)) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Quarterly Financial Information (Unaudited) [Abstract]
Net sales	$ 1,816.7	$ 1,981.4	$ 1,948	$ 1,777.8	$ 1,862.2	$ 1,870.3	$ 1,832.3	$ 1,637.7	$ 7,523.9		$ 7,202.5		$ 6,631.2
Gross margin	344.8	377.8	367.7	338.7	364.9	353.4	351.2	311.4	1,429		1,380.9		1,261.3
Net income (loss) attributable to the Company	$ 14.4	$ 48.8	$ 47	$ 34.3	$ 24.1	$ 53.6	$ 44.5	$ 21.1	$ 144.5		$ 143.3		$ 71.6
Net income (loss) attributable to the Company per share of common stock (usd per share)	$ 0.65	$ 2.17	$ 2.08	$ 1.51	$ 1.08	$ 2.38	$ 1.98	$ 0.93	$ 6.41	[1]	$ 6.37	[1]	$ 3.20	[1]
Common stock dividend declared, percent									5.00%		10.00%		10.00%
Average common shares outstanding by quarter	21,390,053	21,449,751	21,513,493	21,616,141	19,454,943	19,465,072	19,500,916	19,544,758	22,555,240		22,507,701		22,368,941
[1]	Adjusted for the declaration of a 5 % stock dividend in December 2019, shares related to which were issued in February 2020. Prior to the adjustment, the average common shares outstanding were 21.4 million shares and 21.3 million shares for the years ended December 31, 2018 and 2017, respectively.