ACCO Brands (ACCO) 10-K 23 Feb 24 2023 FY Annual report Financial data

Cover page

Cover page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Feb. 15, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-08454
Entity Registrant Name	ACCO Brands Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-2704017
Entity Address, Address Line One	Four Corporate Drive
Entity Address, City or Town	Lake Zurich
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60047
City Area Code	847
Local Phone Number	541-9500
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	ACCO
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 479.8
Entity Common Stock, Shares Outstanding		94,928,320
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive proxy statement to be issued in connection with registrant’s annual stockholders' meeting expected to be held on May 21, 2024, are incorporated by reference into Part III of this report.
Entity Central Index Key	0000712034
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Auditor Information [Abstract]
Auditor Name	KPMG LLP
Auditor Location	Chicago, IL
Auditor Firm ID	185

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents		$ 66.4	$ 62.2
Accounts receivable less allowances of $22.9 and $26.6, respectively		430.7	384.1
Inventories		327.5	395.2
Other current assets		30.8	40.8
Total current assets		855.4	882.3
Total property, plant and equipment		599.6	589.2
Less: accumulated depreciation		(429.5)	(404.1)
Property, plant and equipment, net	[1]	170.1	185.1
Right of use asset, leases		91	88.8
Deferred income taxes		104.7	99.7
Goodwill		590	671.5
Identifiable intangibles, net of accumulated amortization of $429.5 and $380.7, respectively		815.7	847
Other non-current assets		17.9	20.3
Total assets		2,644.8	2,794.7
Current liabilities:
Notes payable		0.2	10.3
Current portion of long-term debt		36.5	49.7
Accounts payable		183.7	239.5
Accrued compensation		53.3	38.3
Accrued customer program liabilities		104	103.3
Lease liabilities		20.5	21.2
Other current liabilities		143.8	126.7
Total current liabilities		542	589
Long-term debt, net of debt issuance costs of $6.7 and $8.4, respectively		882.2	936.5
Long-term lease liabilities		76.8	75.2
Deferred income taxes		125.6	144.1
Pension and post-retirement benefit obligations		157.6	155.5
Other non-current liabilities		73.6	84.3
Total liabilities		1,857.8	1,984.6
Stockholders' equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 99,819,679 and 98,851,581 shares issued and 94,925,652 and 94,260,926 outstanding, respectively		1	1
Treasury stock, 4,894,027 and 4,590,655 shares, respectively		(45.1)	(43.4)
Paid-in capital		1,913.4	1,897.2
Accumulated other comprehensive loss		(526.3)	(540.3)
Accumulated deficit		(556)	(504.4)
Total stockholders' equity		787	810.1
Total liabilities and stockholders' equity		$ 2,644.8	$ 2,794.7
[1] Net property, plant and equipment as of December 31, 2023 and 2022 contained $ 37.9 million and $ 52.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $ 14.1 million , $ 13.9 million and $ 12.9 million for the years ended December 31, 2023, 2022, and 2021 , respectively.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowances	$ 22.9	$ 26.6
Amortizable intangible assets, accumulated amortization	429.5	380.7
Debt Issuance cost, unamortized	$ 6.7	$ 8.4
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares, issued (in shares)	99,819,679	98,851,581
Common stock, shares outstanding (in shares)	94,925,652	94,260,926
Treasury stock, shares (in shares)	4,894,027	4,590,655

Consolidated Statements of (Los

Consolidated Statements of (Loss) Income - USD ($) shares in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Net sales		$ 1,832,800,000	$ 1,947,600,000	$ 2,025,300,000
Cost of products sold		1,234,500,000	1,395,300,000	1,410,400,000
Gross profit		598,300,000	552,300,000	614,900,000
Operating costs and expenses:
Selling, general and administrative expenses		393,500,000	376,700,000	392,600,000
Amortization of intangibles		43,400,000	41,500,000	46,300,000
Restructuring charges		27,200,000	9,600,000	6,000,000
Goodwill impairment		89,500,000	98,700,000	0
Change in fair value of contingent consideration		0	(9,000,000)	19,000,000
Total operating costs and expenses		553,600,000	517,500,000	463,900,000
Operating income	[1]	44,700,000	34,800,000	151,000,000
Non-operating expense (income):
Interest expense		58,600,000	45,600,000	46,300,000
Interest income		(7,100,000)	(8,300,000)	(1,900,000)
Non-operating pension expense (income)		1,800,000	(4,500,000)	(7,900,000)
Other expense (income), net		4,500,000	(12,900,000)	3,100,000
(Loss) income before income tax		(13,100,000)	14,900,000	111,400,000
Income tax expense		8,700,000	28,100,000	9,500,000
Net (loss) income		$ (21,800,000)	$ (13,200,000)	$ 101,900,000
Per share:
Basic (loss) income per share		$ (0.23)	$ (0.14)	$ 1.07
Diluted (loss) income per share		$ (0.23)	$ (0.14)	$ 1.05
Weighted average number of shares outstanding:
Basic (in shares)		95.3	95.3	95.5
Diluted (in shares)	[2]	95.3	95.3	97.1
[1] Operating income as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less SG&A expenses; iv) less amortization of intangibles; v) less restructuring charges; and vi) less change in the fair value of contingent consideration. Due to the net loss during the twelve months ended December 31, 2023 and 2022, the denominator in the diluted earnings per share calculation does not include the effects of the stock awards for which the average market price for the period exceeds the exercised price, as it would result in a less dilutive computation. As a result, diluted earnings per share for the twelve months ended December 31, 2023 and 2022 are the same as basic earnings per share.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (21.8)	$ (13.2)	$ 101.9
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on derivative instruments, net of tax benefit (expense) of $0.6, $1.4 and $(3.0), respectively	(1.8)	(2.9)	7.1
Foreign currency translation adjustments, net of tax benefit (expense) of $0.8, $3.8 and $(2.3), respectively	30.3	(37.9)	(23.4)
Recognition of deferred pension and other post-retirement items, net of tax benefit (expense) of $4.7, $(15.5) and $(12.3), respectively	(14.5)	36	45
Other comprehensive income (loss), net of tax:	14	(4.8)	28.7
Comprehensive (loss) income	$ (7.8)	$ (18)	$ 130.6

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	$ 0.6	$ 1.4	$ (3)
Other comprehensive income (loss), foreign currency translation adjustment, tax	0.8	3.8	(2.3)
Other comprehensive (income) loss, defined benefit plan, after reclassification adjustment, tax	$ 4.7	$ (15.5)	$ (12.3)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net Income (Loss)	$ (21,800,000)	$ (13,200,000)	$ 101,900,000
Amortization of inventory step-up	0	0	3,000,000
Payments of contingent consideration	0	(9,200,000)	0
(Gain) loss on disposal of assets	(300,000)	(3,600,000)	100,000
Deferred income tax (benefit) expense	(20,100,000)	1,300,000	(21,000,000)
Change in fair value of contingent liability	0	(9,000,000)	19,000,000
Depreciation	32,700,000	37,900,000	39,400,000
Amortization of debt issuance costs	3,000,000	2,700,000	2,800,000
Amortization of intangibles	43,400,000	41,500,000	46,300,000
Stock-based compensation	14,800,000	9,500,000	15,200,000
Loss on debt extinguishment	0	0	3,700,000
Non-cash charge for goodwill impairment	89,500,000	98,700,000	0
Changes in operating assets and liabilities:
Accounts receivable	(38,600,000)	31,600,000	(77,600,000)
Inventories	85,500,000	23,200,000	(131,800,000)
Other assets	5,900,000	400,000	(1,200,000)
Accounts payable	(68,000,000)	(66,000,000)	131,200,000
Accrued expenses and other liabilities	18,200,000	(57,500,000)	26,300,000
Accrued income taxes	(15,500,000)	(10,700,000)	2,300,000
Net cash provided by operating activities	128,700,000	77,600,000	159,600,000
Investing activities
Additions to property, plant and equipment	(13,800,000)	(16,500,000)	(21,200,000)
Proceeds from the disposition of assets	2,600,000	7,200,000	0
Cost of acquisitions, net of cash acquired	0	0	15,400,000
Net cash used by investing activities	(11,200,000)	(9,300,000)	(5,800,000)
Financing activities
Proceeds from long-term borrowings	121,900,000	236,700,000	659,700,000
Repayments of long-term debt	(199,200,000)	(220,500,000)	(766,300,000)
Repayments of notes payable, net	(10,200,000)	700,000	3,700,000
Payment for debt premium	0	0	(9,800,000)
Payments for debt issuance costs	0	(1,200,000)	(10,500,000)
Dividends paid	(28,500,000)	(28,600,000)	(25,800,000)
Payments of contingent consideration	0	(17,800,000)	(400,000)
Repurchases of common stock	0	(19,400,000)	0
Payments related to tax withholding for stock-based compensation	(1,700,000)	(2,500,000)	(900,000)
Proceeds from the exercise of stock options	0	4,300,000	3,100,000
Net cash used by financing activities	(117,700,000)	(48,300,000)	(147,200,000)
Effect of foreign exchange rate changes on cash and cash equivalents	4,400,000	1,000,000	(2,000,000)
Net increase in cash and cash equivalents	4,200,000	21,000,000	4,600,000
Cash and cash equivalents
Beginning of the period	62,200,000	41,200,000	36,600,000
End of the period	66,400,000	62,200,000	41,200,000
Cash paid during the year for:
Interest	55,600,000	42,600,000	37,600,000
Income taxes	$ 44,300,000	$ 37,500,000	$ 28,000,000

Consolidated Statements of Stoc

Consolidated Statements of Stockholders’ Equity - USD ($) $ in Millions	Total	Common Stock	Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at start of period at Dec. 31, 2020	$ 742.7	$ 1	$ 1,883.1	$ (39.9)	$ (564.2)	$ (537.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	101.9					101.9
Gain (loss) on derivative financial instruments, net of tax	7.1				7.1
Translation impact, net of tax	(23.4)				(23.4)
Pension and post-retirement adjustment, net of tax	45				45
Stock-based compensation	15.2		16			(0.8)
Common stock issued, net of shares withheld for employee taxes	2.2		3.1	(0.9)
Dividends declared	(25.8)					(25.8)
Other	0.1			0.1
Balance at end of period at Dec. 31, 2021	$ 864.8	$ 1	1,902.2	$ (40.9)	(535.5)	(462)
Balance at start of period (in shares) at Dec. 31, 2020		99.1		4.2
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes (in shares)		1		0.1
Common stock repurchase (in shares)	0
Balance at end of period (in shares) at Dec. 31, 2021		100.1		4.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (13.2)					(13.2)
Gain (loss) on derivative financial instruments, net of tax	(2.9)				(2.9)
Translation impact, net of tax	(37.9)				(37.9)
Pension and post-retirement adjustment, net of tax	36				36
Common stock repurchases	(19.4)		(19.4)
Stock-based compensation	9.5		10			(0.5)
Common stock issued, net of shares withheld for employee taxes	1.8		4.3	$ (2.5)
Dividends declared	(28.6)					(28.6)
Other			(0.1)			0.1
Balance at end of period at Dec. 31, 2022	$ 810.1	$ 1	1,897.2	$ (43.4)	(540.3)	(504.4)
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes (in shares)		1.5		0.3
Common stock repurchase (in shares)	(2,700,000)	(2.7)
Balance at end of period (in shares) at Dec. 31, 2022		98.9		4.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (21.8)					(21.8)
Gain (loss) on derivative financial instruments, net of tax	(1.8)				(1.8)
Translation impact, net of tax	30.3				30.3
Pension and post-retirement adjustment, net of tax	(14.5)				(14.5)
Stock-based compensation	14.8		16.3			(1.5)
Common stock issued, net of shares withheld for employee taxes	(1.7)			$ (1.7)
Dividends declared	(28.5)					(28.5)
Other	(0.1)		0.1			(0.2)
Balance at end of period at Dec. 31, 2023	$ 787	$ 1	$ 1,913.4	$ (45.1)	$ (526.3)	$ (556)
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes (in shares)		0.9		0.3
Common stock repurchase (in shares)	0
Balance at end of period (in shares) at Dec. 31, 2023		99.8		4.9

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Common stock, dividends per share, declared (in dollar per share)	$ 0.3	$ 0.3	$ 0.27

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net Income (Loss)	$ (21.8)	$ (13.2)	$ 101.9

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Rule 10b5-1 Arr Modified Flag	false
Non Rule 10b5-1 Arr Modified Flag	false

Basis of Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1 . Basis of P resentation As used in this Annual Report on Form 10-K for the fiscal year ended December 31, 2023, the terms "ACCO Brands," "ACCO," the "Company," "we," "us," and "our" refer to ACCO Brands Corporation, a Delaware corporation incorporated in 2005, and its consolidated domestic and international subsidiaries. The management of ACCO Brands Corporation is responsible for the accuracy and internal consistency of the preparation of the consolidated financial statements and notes contained in this Annual Report on Form 10-K. The Company may, from time to time, reclassify certain amounts relating to its prior period disclosures to conform to its current period presentation within the notes to the consolidated financial statements. The consolidated financial statements include the accounts of ACCO Brands Corporation and its domestic and international subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation.

Significant Accounting Policies

Significant Accounting Policies, Recent Accounting Pronouncements and Adopted Accounting Standards	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Significant Accounting Policies, Recent Accounting Pronouncements and Adopted Accounting Standards	2 . Significant Accounting Policies, Recent Accounting Pronouncements and Adopted Accounting Standards Nature of Business ACCO Brands is a designer, marketer and manufacturer of recognized consumer, technology and business branded products used in schools, homes and at work. ACCO Brands has three operating business segments based in different geographic regions. Each business segment designs, markets, sources, manufactures, and sells recognized consumer, technology and business branded products used in schools, homes and at work. Product designs are tailored to end-user preferences in each geographic region, and where possible, leverage common engineering, design, and sourcing. Our product categories include gaming and computer accessories; storage and organization; notebooks; shredding; laminating and binding machines; stapling; punching; planners; dry erase boards; and do-it-yourself tools, among others. Our portfolio includes both globally and regionally recognized brands. We distribute our products through a wide variety of channels to ensure that our products are readily and conveniently available for purchase by consumers and other end-users, wherever they prefer to shop. These channels include mass retailers, e-tailers, discount, drug/grocery and variety chains, warehouse clubs, hardware and specialty stores, independent office product dealers, office superstores, wholesalers, contract stationers, and specialist technology businesses. We also sell directly through e-commerce sites and our direct sales organization. Use of Estimates Our financial statements are prepared in conformity with generally accepted accounting principles in the U.S. ("GAAP"). Preparation of our financial statements requires us to make judgments, estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses presented for each reporting period in the financial statements and the related accompanying notes. Actual results could differ significantly from those estimates. We regularly review our assumptions and estimates, which are based on historical experience and, where appropriate, current business trends. Cash and Cash Equivalents Highly liquid investments with an original maturity of three months or less are included in cash and cash equivalents. Accounts Receivable and Allowances for Sales/Pricing/Cash Discounts and Doubtful Accounts Trade receivables are recorded at the stated amount, less allowances for sales/pricing/cash discounts and doubtful accounts. The allowance for sales/pricing/cash discounts represents estimated uncollectible receivables associated with the products previously sold to customers, and is recorded at the same time that the sales are recognized. The allowance is based on historical trends. The allowance for doubtful accounts represents estimated uncollectible receivables associated with potential customer defaults on contractual obligations, usually due to a customer's potential insolvency. The allowance includes amounts for certain customers where a risk of default has been specifically identified. In addition, the allowance includes a provision for customer defaults on a general formulaic basis when it is determined the risk of some default is probable and estimable, but cannot yet be associated with a specific customer. The assessment of the likelihood of customer defaults is based on various factors, including the length of time the receivables are past due, historical experience and existing economic conditions. The allowances are recorded as reductions to "Net sales" and "Accounts receivable, net." Inventories Inventories are priced at the lower of cost (principally first-in, first-out) or net realizable value. When necessary, the write-down of inventory to its net realizable value is recorded for obsolete or slow-moving inventory based on assumptions about future demand and marketability of products, the impact of new product introductions and specific identification of items, such as product discontinuance or engineering/material changes. These estimates could vary significantly, either favorably or unfavorably, from actual requirements if future economic conditions, customer inventory levels or competitive conditions differ from our expectations. Property, Plant and Equipment Property, plant and equipment are carried at cost. Depreciation is provided, principally on a straight-line basis, over the estimated useful lives of the assets. Gains or losses resulting from dispositions are included in operating income. Betterments and renewals, which improve and extend the life of an asset are capitalized; maintenance and repair costs are expensed. Purchased computer software is capitalized and amortized over the software’s useful life. The following table shows estimated useful lives of property, plant and equipment: Property, plant and equipment Useful Life Buildings 40 to 50 years Leasehold improvements Lesser of lease term or the life of the asset Machinery, equipment and furniture 3 to 10 years Computer software 5 to 10 years We capitalize interest for major capital projects. Capitalized interest is added to the cost of the underlying assets and is depreciated over the useful lives of those assets. We did no t capitalize any interest for the years ended December 31, 2023, 2022, and 2021 . Long-Lived Assets We test long-lived assets for impairment whenever events or changes in circumstances indicate that the assets’ carrying amount may not be recoverable from its undiscounted future cash flow. When such events occur, we compare the sum of the undiscounted cash flow expected to result from the use and eventual disposition of the asset or asset group to the carrying amount of a long-lived asset or asset group. The cash flows are based on our best estimate at the time of future cash flow, derived from the most recent business projections. If this comparison indicates that there is an impairment, the amount of the impairment is typically calculated using discounted expected future cash flow. The discount rate applied to these cash flows is based on our weighted average cost of capital, computed by selecting market rates at the valuation dates for debt and equity that are reflective of the risks associated with an investment in our industry as estimated by using comparable publicly traded companies. Intangible Assets Intangible assets are comprised primarily of indefinite-lived and amortizable intangible assets acquired and arising from the application of purchase accounting. Indefinite-lived intangible assets are not amortized, but are evaluated at least annually to determine whether the indefinite useful life is appropriate. Certain of our trade names have been assigned an indefinite life as we currently anticipate that these trade names will contribute cash flows to ACCO Brands indefinitely. Amortizable intangible assets are amortized over their useful lives. We test indefinite-lived intangibles for impairment annually, during the second quarter, and during any interim period when market or business events indicate there may be a potential adverse impact on a particular intangible. The test may be on a qualitative or quantitative basis as allowed by GAAP. We consider the implications of both external factors (e.g., market growth, pricing, competition, and technology) and internal factors (e.g., product costs, margins, support expenses, and capital investment) and their potential impact on cash flows in both the near and long term, as well as their impact on any identifiable intangible asset associated with the business. Based on recent business results, consideration of significant external and internal factors, and the resulting business projections, indefinite-lived intangible assets are reviewed to determine whether they are likely to remain indefinite-lived, or whether a finite life is more appropriate. In addition, based on events in the period and future expectations, management considers whether the potential for impairment exists. Finite lived intangibles are amortized over 5 , 7 , 10 , 15 , 23 or 30 year s. We performed our annual assessment, in the second quarter of 2023 , on a qualitative basis, and concluded that it was not more likely than no t that the fair value of any indefinite-lived intangible was less than its carrying amount. In addition, we have not identified a triggering event through December 31, 2023 that more likely than not would result in impairment. Goodwill Goodwill has been recorded on our balance sheet and represents the excess of the cost of an acquisition when compared with the fair value of the net assets acquired. The authoritative guidance on goodwill and other intangible assets requires that goodwill be tested for impairment at a reporting unit level. We have determined that our reporting units are ACCO Brands North America, ACCO Brands EMEA and ACCO Brands International. We test goodwill for impairment annually, during the second quarter, or any interim period when market or business events indicate there may be a potential adverse impact on goodwill. As permitted by GAAP, we may perform a qualitative assessment to determine if it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform a quantitative goodwill impairment test as required by GAAP. We performed our annual assessment in the second quarter of 2023 , on a qualitative basis, and concluded that it was no t more likely than not that the fair value of any reporting unit was less than its carrying amount. During the fourth quarter of 2023 , our forecasted cash flows for our North America reporting unit further declined, including lower demand for our technology accessories, due to a weaker macroeconomic environment as well as tight inventory management by retail customers. As a result, we identified a triggering event indicating it was more likely than not that an impairment loss had been incurred. Accordingly, as of December 31, 2023, we completed an impairment assessment, on a quantitative basis, for goodwill for each of our three reporting units. The result of our assessment was that the fair value of the North America reporting unit did not exceed its carrying value resulting in an impairment charge of $ 89.5 million . The result of our assessment for the International and EMEA reporting units was that the fair value of each exceeded its carrying values by approximately ten percent and greater than fifty percent, respectively, and we concluded that no impairment existed. Estimating the fair value of each reporting unit requires us to make assumptions and estimates regarding our future. We utilized a combination of both a discounted cash flows and market approach. The financial projections used in the valuation models reflected management's assumptions regarding revenue growth rates, economic and market trends, cost structure, discount rate, and other expectations about the anticipated short-term and long-term operating results for each of our three reporting units. We believe the assumptions used in our goodwill impairment analysis are appropriate and result in reasonable estimates of the implied fair value of each reporting unit. However, given the economic environment and the uncertainties regarding the impact on our business, there can be no assurance that our estimates and assumptions, made for purposes of our goodwill impairment testing, will prove to be an accurate prediction of the future. If our assumptions regarding future performance are not achieved, we may be required to record additional goodwill impairment charges in future periods. Employee Benefit Plans We provide a range of benefits to our employees and retired employees, including pension, post-retirement, post-employment and health care benefits. We record annual amounts relating to these plans based on calculations specified by GAAP, which include various actuarial assumptions, including discount rates, assumed rates of return, mortality rate tables, compensation increases, turnover rates and health care cost trends. Actuarial assumptions are reviewed on an annual basis and modifications to these assumptions are made based on current rates and trends when it is deemed appropriate. As required by GAAP, the effect of our modifications and unrecognized actuarial gains and losses are generally recorded to a separate component of accumulated other comprehensive income (loss) ("AOCI") in stockholders’ equity and amortized over future periods. Income Taxes Deferred tax liabilities or assets are established for temporary differences between financial and tax reporting basis and are subsequently adjusted to reflect changes in tax rates expected to be in effect when the temporary differences reverse. A valuation allowance is recorded to reduce deferred tax assets to an amount that is more likely than not to be realized. Facts and circumstances may change and cause us to revise our conclusions regarding our ability to realize certain net operating losses and other deferred tax attributes. The amount of income taxes that we pay is subject to ongoing audits by federal, state and foreign tax authorities. Our estimate of the potential outcome of any uncertain tax position is subject to management’s assessment of relevant risks, facts and circumstances existing at that time. We believe that we have adequately provided for reasonably foreseeable outcomes related to these matters. However, our future results may include favorable or unfavorable adjustments to our estimated tax liabilities in the period any assessments are received, revised or resolved. As of December 31, 2023, the Company has recorded $ 4.0 million of deferred taxes on approximately $ 249.2 million of unremitted earnings of non-U.S. subsidiaries that may be remitted to the U.S. The Company has approximately $ 272.7 million of additional unremitted earnings of non-U.S. subsidiaries, which are indefinitely reinvested and for which no deferred taxes have been provided. Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to our customers in an amount reflective of the consideration we expect to receive in exchange for those goods or services. Taxes we collect concurrent with revenue producing activities are excluded from revenue. Incidental items incurred that are immaterial in the context of the contract are expensed. At the inception of each contract, the Company assesses the products and services promised and identifies each distinct performance obligation. To identify the performance obligations, the Company considers all products and services promised regardless of whether they are explicitly stated or implied within the contract or by standard business practices. Products : For our products, we transfer control and recognize a sale primarily when we either ship the product from our manufacturing facility or distribution center, or upon delivery to a customer-specified location depending upon the terms in the customer agreement. In addition, we recognize revenue for private label products as the product is manufactured (or over time) when a contract has an enforceable right to payment. For consignment arrangements, revenue is not recognized until the products are sold to the end customer. Customer Program Costs : Customer programs and incentives ("Customer Program Costs") are a common practice in our industry. We incur Customer Program Costs to obtain favorable product placement, to promote sell-through of products and to maintain competitive pricing. The amount of consideration we receive and revenue we recognize is impacted by Customer Program Costs, including sales rebates; in-store promotional allowances; shared media and customer catalog allowances; other cooperative advertising arrangements; freight allowance programs offered to our customers; and allowances for discounts. We recognize Customer Program Costs, primarily as a deduction to gross sales, at the time that the associated revenue is recognized. Customer Program Costs are based on management's best estimates using the most likely amount method and is an amount that is probable of not being reversed. In the absence of a signed contract, estimates are based on historical or projected experience for each program type or customer. We adjust our estimate of revenue when the most likely amount of consideration we expect to receive changes. Service or Extended Maintenance Agreements ("EMAs"): Depending on the terms of the EMA, we may defer recognition of the consideration received for any unsatisfied obligations. We use an observable price to determine the stand-alone selling price for separate performance obligations or an estimated cost plus margin approach, for our separately priced service/maintenance agreements that extend mechanical and maintenance coverage beyond our base warranty coverage to our Print Finishing Solutions customers. These agreements range in duration from three to sixty month s, however, most agreements are one year or less. We generally receive payment at inception of the EMAs and recognize revenue over the term of the agreement on a straight-line basis. Shipping and Handling : Freight and distribution activities performed before the customer obtains control of the goods are not considered promised services under customer contracts and therefore are not distinct performance obligations. The Company has chosen to account for shipping and handling activities as a fulfillment activity, and therefore accrues the expense of freight and distribution in "Cost of products sold" when products are shipped. We reflect all amounts billed to customers for shipping and handling in net sales and the costs we incurred for shipping and handling (including costs to ship and move product from the seller’s place of business to the buyer’s place of business, as well as costs to store, move and prepare products for shipment) in cost of products sold. Reserve for Sales Returns: The reserve for sales returns represents estimated uncollectible receivables associated with the potential return of products previously sold to customers, and is recorded at the same time that the sales are recognized. The reserve includes a general provision for product returns based on historical trends. In addition, the reserve includes amounts for currently authorized customer returns that are considered to be abnormal in comparison to the historical trends. We record the returns reserve, on a gross basis, as a reduction to "Net sales" and "Cost of products sold" with increases to "Other current liabilities" and "Inventories." Cost of Products Sold Cost of products sold includes all manufacturing, product sourcing and distribution costs, including depreciation related to assets used in the manufacturing, procurement and distribution process, allocation of certain information technology costs supporting those processes, inbound and outbound freight, shipping and handling costs, purchasing costs associated with materials and packaging used in the production processes, and inventory valuation adjustments. Selling, General and Administrative Expenses Selling, general and administrative expenses ("SG&A") include advertising, marketing, and selling (including commissions) expenses, research and development, customer service, depreciation related to assets outside the manufacturing and distribution processes and all other general and administrative expenses outside the manufacturing and distribution functions (e.g., finance, human resources, information technology, legal and other corporate expenses). Advertising Expenses Advertising expenses were $ 102.7 million , $ 108.8 million and $ 117.4 million for the years ended December 31, 2023, 2022 and 2021, respectively. These costs primarily include, but are not limited to, cooperative advertising and promotional allowances as described in " Customer Program Costs " above, and are principally expensed as incurred. Warranty Reserves We offer our customers various warranty terms based on the type of product that is sold. Estimated future obligations related to products sold under these warranty terms are provided by charges to cost of products sold in the same period in which the related revenue is recognized. Research and Development Expenses Research and development expenses were $ 25.8 million , $ 26.3 million and $ 26.6 million for the years ended December 31, 2023, 2022 and 2021 , respectively, are classified as SG&A expenses and are charged to expense as incurred. Stock-Based Compensation Our primary types of stock-based compensation consist of stock options, restricted stock unit awards and performance stock unit awards. Stock-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized as expense over the requisite service period. Where awards are made with non-substantive vesting periods (for example, where a portion of the award vests due to retirement eligibility), we estimate and recognize expense based on the period from the grant date to the date on which the employee is retirement eligible. The Company accounts for forfeitures as they occur. Foreign Currency Translation Foreign currency balance sheet accounts are translated into U.S. dollars at the rates of exchange at the balance sheet date. Income and expenses are translated at the average rates of exchange in effect during the period. The related translation adjustments are made directly to a separate component of AOCI in stockholders’ equity. Some transactions are made in currencies different from an entity’s functional currency; gains and losses on these foreign currency transactions are included in the income statement. Derivative Financial Instruments We recognize all derivatives as either assets or liabilities on the balance sheet and record those instruments at fair value. If the derivative is designated as a fair value hedge and is effective, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings in the same period. If the derivative is designated as a cash flow hedge, the effective portions of changes in the fair value of the derivative are recorded in AOCI and are recognized in the Consolidated Statements of Income when the hedged item affects earnings. Ineffective portions of changes in the fair value of cash flow hedges are recognized in earnings. Certain forecasted transactions, and assets and liabilities are exposed to foreign currency risk. We continually monitor our foreign currency exposures in order to maximize the overall effectiveness of our foreign currency hedge positions. Principal currencies hedged against the U.S. dollar include the Euro, Australian dollar, Canadian dollar, Swedish krona, British pound and Japanese yen. Recent Accounting Pronouncements In November 2023, the Financial Accounting Standards Board ("FASB") issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and to provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. The ASU does not change how a public entity identifies its operating segments, aggregates them, or applies the quantitative thresholds to determine its reportable segments. This ASU is effective for annual periods beginning after December 15, 2023, and for interim periods beginning after December 15, 2024, with early adoption permitted. We are evaluating the effect this guidance will have on our segment disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which enhances the income tax disclosures to provide information to better assess how an entity’s operations and related tax risks and tax planning and operational opportunities affect its tax rate and prospects for future cash flows. This ASU is effective for annual periods beginning after December 15, 2024, with early adoption permitted. We are evaluating the effect this guidance will have on our tax disclosures. There were no other recently issued accounting standards that are expected to have an impact on the Company’s financial condition, results of operations or cash flow. Recently Adopted Accounting Standards In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848), which provides optional expedients and exceptions for applying current GAAP to contracts, hedging relationships, and other transactions affected by the transition from the use of LIBOR to an alternative reference rate. Effective in the fourth quarter of 2022, the Company adopted this standard. The adoption of this standard did not have a material impact on our consolidated financial statements. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which removes certain exceptions for investments, intraperiod allocations and interim calculations, and adds guidance to reduce complexity in accounting for income taxes. Effective January 1, 2021, the Company adopted this standard. The adoption of this standard did not have a material impact on our consolidated financial statements. There were no other accounting standards that were adopted in 2023, 2022, and 2021 that had a material effect on the Company’s financial condition, results of operations or cash flow.

Long-term Debt and Short-term B

Long-term Debt and Short-term Borrowings	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Long-term Debt and Short-term Borrowings	4.50 to 1.00 2.50 % 1.50 % 0.500 % ≤ 4.50 to 1.00 and > 4.00 to 1.00 2.25 % 1.25 % 0.375 % ≤ 4.00 to 1.00 and > 3.50 to 1.00 2.00 % 1.00 % 0.350 % ≤ 3.50 to 1.00 and > 3.00 to 1.00 1.75 % 0.75 % 0.300 % ≤ 3.00 to 1.00 and > 2.00 to 1.00 1.50 % 0.50 % 0.250 % ≤ 2.00 to 1.00 1.25 % 0.25 % 0.200 % As of December 31, 2023 , the applicable rate on Euro, Australian and Canadian dollar loans was 2.00 percent and the applicable rate on Base Rate loans was 1.00 percent. Undrawn amounts under the Revolving Facility are subject to a commitment fee rate of 0.20 percent to 0.50 percent per annum, depending on the Company's Consolidated Leverage Ratio. As of December 31, 2023 , the commitment fee rate was 0.35 percent. As of December 31, 2023, there was $ 21.6 million in borrowings outstanding under the Revolving Facility ( $ 7.3 million reported in "Current portion of long-term debt" and $ 14.3 million reported in "Long-term debt, net"), and the amount available for borrowings was $ 565.7 million (allowing for $ 12.7 million of letters of credit outstanding on that date). Amortization The outstanding principal amounts under the Term Loan Facility are payable in quarterly installments in an amount representing, on an annual basis, 1.875 percent of the initial aggregate principal amount of such loan facility and increasing to 2.50 percent in June 2025. Dividends and Share Repurchases Under the Credit Agreement, as amended, the Company may pay dividends and/or repurchase shares in an aggregate amount not to exceed the sum of: (i) the greater of $ 40.0 million and 1 percent of the Company’s Consolidated Total Assets (as defined in the Credit Agreement, as amended) during any fiscal year; plus (ii) an additional amount not to exceed $ 75.0 million during any fiscal year (provided the Company’s Consolidated Leverage Ratio after giving pro forma effect to the restricted payment would not be greater than A) 4.25x for the fiscal quarters ending December 31, 2022, March 31, 2023, June 30, 2023 and September 30, 2023, and B) 0.25x inside the applicable Consolidated Leverage Ratio financial covenant thereafter); plus (iii) an additional amount so long as the Consolidated Leverage Ratio after giving pro forma effect to the restricted payment would be less than or equal to 3.25x; plus (iv) any Net Equity Proceeds (as defined in the Credit Agreement, as amended). Financial Covenants As of December 31, 2023, our Consolidated Leverage Ratio was approximately 3.42 to 1.00 versus our maximum covenant of 4.25 to 1.00. Our Interest Coverage Ratio was approximately 5.18 to 1.00 versus the minimum financial covenant of 3.00 to 1.00. Other Covenants and Restrictions The Credit Agreement, as amended, contains customary affirmative and negative covenants as well as events of default, including payment defaults, breach of representations and warranties, covenant defaults, cross-defaults, certain bankruptcy or insolvency events, certain ERISA-related events, changes in control or ownership and invalidity of any loan document. The Credit Agreement, as amended, also establishes limitations on the aggregate amount of Permitted Acquisitions and Investments (each as defined in the Credit Agreement, as amended) that the Company and its subsidiaries may make during the term of the Credit Agreement, as amended. Incremental Facilities The Credit Agreement, as amended, permits the Company to seek increases in the size of the Revolving Facility and the Term Loan Facility prior to maturity by up to $ 500.0 million in the aggregate, subject to lender commitment and the conditions set forth in the Credit Agreement, as amended. Senior Unsecured Notes due March 2029 (the "Senior Unsecured Notes") The Senior Unsecured Notes indenture contains covenants that could limit the ability of the Company and its restricted subsidiaries to, among other things: (i) incur additional indebtedness or issue disqualified stock or, in the case of the Company’s restricted subsidiaries, preferred stock; (ii) create liens; (iii) pay dividends, make certain investments or make other restricted payments; (iv) sell certain assets or merge with or into other companies; (v) enter into transactions with affiliates; and (vi) allow any restricted subsidiary to pay dividends, loans, or assets to the Company or other restricted subsidiaries. These covenants are subject to a number of important limitations and exceptions. The Senior Unsecured Notes indenture also provides for events of default, which, if any of them occurs, would permit or require the principal, premium, if any, and accrued but unpaid interest on all the then outstanding Senior Unsecured Notes to be immediately due and payable. Compliance with Loan Covenants As of and for the periods ended December 31, 2023, and December 31, 2022, the Company was in compliance with all applicable loan covenants under its senior secured credit facilities and the Senior Unsecured Notes. Guarantees and Security Generally, obligations under the Credit Agreement, as amended, are guaranteed by certain of the Company's existing and future subsidiaries, and are secured by substantially all of the Company's and certain guarantor subsidiaries' assets, subject to certain exclusions and limitations. The Senior Unsecured Notes are irrevocably and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by each of our existing and future domestic subsidiaries other than certain excluded subsidiaries. The Senior Unsecured Notes and the related guarantees rank equally in right of payment with all of the existing and future senior debt of the Company and the guarantors, senior in right of payment to all of the existing and future subordinated debt of the Company and the guarantors, and effectively subordinated to all of the existing and future secured indebtedness of the Company and the guarantors to the extent of the value of the assets securing such indebtedness. The Senior Unsecured Notes and the guarantees are and will be structurally subordinated to all existing and future liabilities, including trade payables, of each of the Company's subsidiaries that do not guarantee the notes." id="sjs-B4">3 . Long-term Debt and Short-term Borrowings Notes payable and long-term debt, listed in order of the priority of security interests in assets of the Company, consisted of the following as of December 31, 2023 and 2022: (in millions) December 31, December 31, Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 5.93 % at December 31, 2023 and 3.90 % at December 31, 2022) $ 218.2 $ 227.4 USD Senior Secured Term Loan A, due March 2026 (floating interest rate of 7.50 % at December 31, 2023 and 6.40 % at December 31, 2022) 78.0 84.4 Australian Dollar Senior Secured Term Loan A, due March 2026 (floating interest rate of 6.42 % at December 31, 2023 and 5.30 % at December 31, 2022) 32.5 34.9 U.S. Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 7.40 % at December 31, 2023 and 6.36 % at December 31, 2022) 7.3 58.6 Australian Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 6.42 % at December 31, 2023 and 5.18 % at December 31, 2022) 14.3 14.2 Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25 %) 575.0 575.0 Other borrowings 0.3 10.4 Total debt 925.6 1,004.9 Less: Current portion 36.7 60.0 Debt issuance costs, unamortized 6.7 8.4 Long-term debt, net $ 882.2 $ 936.5 The Company is party to a Third Amended and Restated Credit Agreement (the "Credit Agreement"), dated as of January 27, 2017, among the Company, certain subsidiaries of the Company, Bank of America, N.A., as administrative agent, and the other agents and various lenders party thereto. The Credit Agreement, as amended, provides for a senior secured credit facility, which consists of a € 300.0 million (US$ 320.8 million based on January 27, 2017, exchange rates) term loan facility, an A$ 80.0 million (US$ 60.4 million based on January 27, 2017, exchange rates) term loan facility, a US$ 100.0 million term loan facility, and a US$ 600.0 million multi-currency revolving credit facility (the "Revolving Facility"). From July 2018 to November 2022, the Company entered into six amendments (the "Amendments") to the Credit Agreement. The following are the key changes, among other things, to the Credit Agreement as a result of the Amendments: • replaced the minimum fixed coverage ratio of 1.25 :1.00 with a minimum Interest Coverage Ratio (as defined in the Credit Agreement) of 3.00 :1.00; • increase the maximum Consolidated Leverage Ratio financial covenant from current levels for each of the five fiscal quarters beginning December 31, 2022, and ending December 31, 2023, as follows: Quarter Ended Maximum Consolidated Leverage Ratio December 2022 4.50 :1.00 March 2023 5.00 :1.00 June 2023 5.00 :1.00 September 2023 4.75 :1.00 December 2023 4.25 :1.00 • modify the maximum Consolidated Leverage Ratio financial covenant for all first and second fiscal quarters after December 31, 2023, from the current level of 4.00x to 4.50x, while maintaining the current level of 4.00x for all third and fourth fiscal quarters; • limit the maximum Consolidated Leverage Ratio to 5.00 :1.00 at any time, thereby capping any material acquisition step ups for the fiscal quarters ending March 31, 2023, June 30, 2023 and September 30, 2023; • increase the Company’s flexibility under the restricted payments baskets; and • change the U.S. dollar reference rate from LIBOR-based pricing to SOFR-based pricing, with no changes to existing margins. The current maturity of the Credit Agreement, as amended, is March 31, 2026 and the current pricing is as follows: Consolidated Leverage Ratio Applicable Rate on Euro/AUD/CDN Dollar Loans Applicable Rate on Base Rate Loans Undrawn Fee > 4.50 to 1.00 2.50 % 1.50 % 0.500 % ≤ 4.50 to 1.00 and > 4.00 to 1.00 2.25 % 1.25 % 0.375 % ≤ 4.00 to 1.00 and > 3.50 to 1.00 2.00 % 1.00 % 0.350 % ≤ 3.50 to 1.00 and > 3.00 to 1.00 1.75 % 0.75 % 0.300 % ≤ 3.00 to 1.00 and > 2.00 to 1.00 1.50 % 0.50 % 0.250 % ≤ 2.00 to 1.00 1.25 % 0.25 % 0.200 % As of December 31, 2023 , the applicable rate on Euro, Australian and Canadian dollar loans was 2.00 percent and the applicable rate on Base Rate loans was 1.00 percent. Undrawn amounts under the Revolving Facility are subject to a commitment fee rate of 0.20 percent to 0.50 percent per annum, depending on the Company's Consolidated Leverage Ratio. As of December 31, 2023 , the commitment fee rate was 0.35 percent. As of December 31, 2023, there was $ 21.6 million in borrowings outstanding under the Revolving Facility ( $ 7.3 million reported in "Current portion of long-term debt" and $ 14.3 million reported in "Long-term debt, net"), and the amount available for borrowings was $ 565.7 million (allowing for $ 12.7 million of letters of credit outstanding on that date). Amortization The outstanding principal amounts under the Term Loan Facility are payable in quarterly installments in an amount representing, on an annual basis, 1.875 percent of the initial aggregate principal amount of such loan facility and increasing to 2.50 percent in June 2025. Dividends and Share Repurchases Under the Credit Agreement, as amended, the Company may pay dividends and/or repurchase shares in an aggregate amount not to exceed the sum of: (i) the greater of $ 40.0 million and 1 percent of the Company’s Consolidated Total Assets (as defined in the Credit Agreement, as amended) during any fiscal year; plus (ii) an additional amount not to exceed $ 75.0 million during any fiscal year (provided the Company’s Consolidated Leverage Ratio after giving pro forma effect to the restricted payment would not be greater than A) 4.25x for the fiscal quarters ending December 31, 2022, March 31, 2023, June 30, 2023 and September 30, 2023, and B) 0.25x inside the applicable Consolidated Leverage Ratio financial covenant thereafter); plus (iii) an additional amount so long as the Consolidated Leverage Ratio after giving pro forma effect to the restricted payment would be less than or equal to 3.25x; plus (iv) any Net Equity Proceeds (as defined in the Credit Agreement, as amended). Financial Covenants As of December 31, 2023, our Consolidated Leverage Ratio was approximately 3.42 to 1.00 versus our maximum covenant of 4.25 to 1.00. Our Interest Coverage Ratio was approximately 5.18 to 1.00 versus the minimum financial covenant of 3.00 to 1.00. Other Covenants and Restrictions The Credit Agreement, as amended, contains customary affirmative and negative covenants as well as events of default, including payment defaults, breach of representations and warranties, covenant defaults, cross-defaults, certain bankruptcy or insolvency events, certain ERISA-related events, changes in control or ownership and invalidity of any loan document. The Credit Agreement, as amended, also establishes limitations on the aggregate amount of Permitted Acquisitions and Investments (each as defined in the Credit Agreement, as amended) that the Company and its subsidiaries may make during the term of the Credit Agreement, as amended. Incremental Facilities The Credit Agreement, as amended, permits the Company to seek increases in the size of the Revolving Facility and the Term Loan Facility prior to maturity by up to $ 500.0 million in the aggregate, subject to lender commitment and the conditions set forth in the Credit Agreement, as amended. Senior Unsecured Notes due March 2029 (the "Senior Unsecured Notes") The Senior Unsecured Notes indenture contains covenants that could limit the ability of the Company and its restricted subsidiaries to, among other things: (i) incur additional indebtedness or issue disqualified stock or, in the case of the Company’s restricted subsidiaries, preferred stock; (ii) create liens; (iii) pay dividends, make certain investments or make other restricted payments; (iv) sell certain assets or merge with or into other companies; (v) enter into transactions with affiliates; and (vi) allow any restricted subsidiary to pay dividends, loans, or assets to the Company or other restricted subsidiaries. These covenants are subject to a number of important limitations and exceptions. The Senior Unsecured Notes indenture also provides for events of default, which, if any of them occurs, would permit or require the principal, premium, if any, and accrued but unpaid interest on all the then outstanding Senior Unsecured Notes to be immediately due and payable. Compliance with Loan Covenants As of and for the periods ended December 31, 2023, and December 31, 2022, the Company was in compliance with all applicable loan covenants under its senior secured credit facilities and the Senior Unsecured Notes. Guarantees and Security Generally, obligations under the Credit Agreement, as amended, are guaranteed by certain of the Company's existing and future subsidiaries, and are secured by substantially all of the Company's and certain guarantor subsidiaries' assets, subject to certain exclusions and limitations. The Senior Unsecured Notes are irrevocably and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by each of our existing and future domestic subsidiaries other than certain excluded subsidiaries. The Senior Unsecured Notes and the related guarantees rank equally in right of payment with all of the existing and future senior debt of the Company and the guarantors, senior in right of payment to all of the existing and future subordinated debt of the Company and the guarantors, and effectively subordinated to all of the existing and future secured indebtedness of the Company and the guarantors to the extent of the value of the assets securing such indebtedness. The Senior Unsecured Notes and the guarantees are and will be structurally subordinated to all existing and future liabilities, including trade payables, of each of the Company's subsidiaries that do not guarantee the notes.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Leases	4 . Leases The Company leases its corporate headquarters, various other facilities for distribution, manufacturing, and offices, as well as vehicles, forklifts and other equipment. The Company determines if an arrangement is a lease at inception. Leases are included in "Right of use asset, leases" ("ROU Assets"), and the current portion of the lease liability is included in "Lease liabilities" and the non-current portion is included in "Long-term lease liabilities" in the Consolidated Balance Sheet. The Company currently has an immaterial amount of financing leases and leases with terms of more than one month and less than 12 months. ROU Assets and lease liabilities are recognized based on the present value of lease payments over the lease term. Because most of the Company’s leases do not provide an implicit rate of return, the Company uses its incremental collateralized borrowing rate, on a regional basis, in determining the present value of lease payments. The incremental borrowing rate is dependent upon duration of the lease and has been segmented into three groups of time. All leases within the same region and the same group of time, share the same incremental borrowing rate. The Company has lease agreements with lease and non-lease components, which are combined for accounting purposes for all classes of assets except information technology equipment. The components of lease expense for the years ended December 31, 2023, 2022, and 2021, were as follows: (in millions) 2023 2022 2021 Operating lease cost $ 28.6 $ 29.5 $ 29.7 Sublease income ( 2.5 ) ( 2.4 ) ( 1.9 ) Total lease cost $ 26.1 $ 27.1 $ 27.8 Other information related to leases for the years ended December 31, 2023, and 2022 was as follows: (in millions, except lease term and discount rate) 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 29.8 $ 30.5 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 23.2 $ 11.4 Weighted average remaining lease term: Operating leases 6 years Weighted average discount rate: Operating leases 5.2 % Future minimum lease payments, net of sub-lease income, for all non-cancelable leases as of December 31, 2023 were as follows: (in millions) Operating 2024 $ 26.6 2025 24.4 2026 19.8 2027 14.5 2028 12.3 Thereafter 25.5 Total minimum lease payments 123.1 Less imputed interest 25.8 Future minimum payments for leases, net of sublease rental income and imputed interest $ 97.3

Pension and Other Retiree Benef

Pension and Other Retiree Benefits	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Pension and Other Retiree Benefits	5 . Pension and Other Retiree Benefits We have a number of pension plans, principally in Germany, the U.K. and the U.S. The plans provide for payment of retirement benefits, primarily commencing between the ages of 60 and 65 , and also for payment of certain disability and severance benefits. After meeting certain qualifications, an employee acquires a vested right to future benefits. The benefits payable under the plans are generally determined based on an employee’s length of service and earnings. The majority of these plans have been frozen and are no longer accruing additional service benefits. Cash contributions to the plans are made as necessary to ensure legal funding requirements are satisfied. The ACCO Brands Corporation Pension Plan was fully and permanently frozen as of December 31, 2021. In 2019, the Esselte U.K. plan was frozen and merged with the legacy ACCO U.K. plan, which was frozen on September 30, 2012. As of December 31, 2016, all of our Canadian pension plans were frozen. Effective July 1, 2022, the Company announced its plan to terminate the Canadian pension plans. During 2023, we recognized a settlement cost of $ 0.7 million due as lump sum payments exceeded the settlement threshold. We expect the termination of the Canadian pension plans to be finalized in 2024. Our German Esselte Leitz Pension Plan had an unfunded liability of $ 109.9 million and $ 103.0 million for the years ended December 31, 2023, and 2022, respectively. As is customary, there are no plans to, and there is no requirement to, fund the German Pension Plan other than to meet the current liabilities. We also provide post-retirement health care and life insurance benefits to certain employees and retirees in the U.S., U.K. and Canada. All but one of these benefit plans is no longer open to new participants. Many employees and retirees outside of the U.S. are covered by government health care programs. The following table sets forth our defined benefit pension and post-retirement plans funded status and the amounts recognized in our Consolidated Balance Sheets: Pension Post-retirement U.S. International (in millions) 2023 2022 2023 2022 2023 2022 Change in projected benefit obligation (PBO) Projected benefit obligation at beginning of year $ 162.3 $ 212.5 $ 441.1 $ 673.6 $ 3.2 $ 4.3 Service cost — — 0.5 1.0 — — Interest cost 7.9 4.9 20.0 9.6 0.2 0.1 Actuarial loss (gain) 3.2 ( 45.2 ) 14.6 ( 158.7 ) 0.1 ( 0.6 ) Participants’ contributions — — 0.1 0.1 — — Benefits paid ( 10.8 ) ( 9.9 ) ( 27.0 ) ( 25.7 ) ( 0.3 ) ( 0.4 ) Settlement — — ( 3.9 ) — — — Termination benefits — — — 0.8 — — Foreign exchange rate changes — — 22.0 ( 59.6 ) 0.1 ( 0.2 ) Projected benefit obligation at end of year 162.6 162.3 467.4 441.1 3.3 3.2 Change in plan assets Fair value of plan assets at beginning of year 140.2 180.9 306.4 481.7 — — Actual return on plan assets 13.6 ( 33.3 ) 18.9 ( 117.2 ) — — Employer contributions 2.5 2.5 14.1 13.4 0.3 0.4 Participants’ contributions — — 0.1 0.1 — — Benefits paid ( 10.8 ) ( 9.9 ) ( 27.0 ) ( 25.7 ) ( 0.3 ) ( 0.4 ) Settlement — — ( 4.0 ) — — — Foreign exchange rate changes — — 16.4 ( 45.9 ) — — Fair value of plan assets at end of year 145.5 140.2 324.9 306.4 — — Funded status (Fair value of plan assets less PBO) $ ( 17.1 ) $ ( 22.1 ) $ ( 142.5 ) $ ( 134.7 ) $ ( 3.3 ) $ ( 3.2 ) Amounts recognized in the Consolidated Balance Sheets consist of: Other non-current assets $ — $ — $ 2.5 $ 2.8 $ — $ — Other current liabilities — — 7.5 6.9 0.3 0.4 Pension and post-retirement benefit obligations 17.1 22.1 137.5 130.6 3.0 2.8 Components of accumulated other comprehensive income (loss), net of tax: Unrecognized actuarial loss (gain) 90.7 91.3 139.9 120.6 ( 3.6 ) ( 4.2 ) Unrecognized prior service cost — — 5.2 5.2 — — Pension and post-retirement benefit obligations of $ 157.6 million as of December 31, 2023, increased from $ 155.5 million as of December 31, 2022. The increase was primarily due to updated assumptions and foreign exchange, partly offset by cash contributions. The accumulated benefit obligation for all pension plans was $ 625.1 million and $ 598.1 million at December 31, 2023 and 2022, respectively. The following table sets out information for pension plans with an accumulated benefit obligation in excess of plan assets: U.S. International (in millions) 2023 2022 2023 2022 Accumulated benefit obligation $ 162.6 $ 162.3 $ 437.4 $ 406.1 Fair value of plan assets 145.5 140.2 297.2 273.7 The following table sets out information for pension plans with a projected benefit obligation in excess of plan assets: U.S. International (in millions) 2023 2022 2023 2022 Projected benefit obligation $ 162.6 $ 162.3 $ 442.1 $ 411.3 Fair value of plan assets 145.5 140.2 297.2 273.7 The components of net periodic benefit (income) cost for pension and post-retirement plans for the years ended December 31, 2023, 2022, and 2021, were as follows: Year Ended December 31, Pension Post-retirement U.S. International (in millions) 2023 2022 2021 2023 2022 2021 2023 2022 2021 Service cost $ — $ — $ 0.5 $ 0.5 $ 1.0 $ 1.5 $ — $ — $ — Interest cost 7.9 4.9 4.5 20.0 9.6 6.3 0.2 0.1 0.1 Expected return on plan assets ( 12.0 ) ( 10.9 ) ( 11.4 ) ( 21.5 ) ( 17.5 ) ( 19.3 ) — — — Amortization of net loss (gain) 2.2 3.7 3.6 4.2 5.0 7.1 ( 0.5 ) ( 0.5 ) ( 0.5 ) Amortization of prior service cost — — 0.1 0.3 0.3 0.3 — — — Special termination benefit (1) — — — — 0.8 — — — — Curtailment loss (2) — — 1.4 — — — — — — Settlement loss — — — 1.2 — — — — — Net periodic benefit (income) cost (3) $ ( 1.9 ) $ ( 2.3 ) $ ( 1.3 ) $ 4.7 $ ( 0.8 ) $ ( 4.1 ) $ ( 0.3 ) $ ( 0.4 ) $ ( 0.4 ) (1) Special termination benefit of $ 0.8 million due to the plan wind-up of the ACCO Brands Canada Salaried and Hourly plans effective July 1, 2022. The plan wind-up is considered an irrevocable event that triggers special accounting, specifically a one-time special termination benefit. The plan wind-up is expected to be completed in 2024. (2) Curtailment loss of $ 1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan. (3) The components of net periodic benefit (income) cost, other than service cost, are included in the line "Non-operating pension expense (income)" in the Consolidated Statements of Income (Loss). Other changes in plan assets and benefit obligations that were recognized in accumulated other comprehensive income (loss) during the years ended December 31, 2023, 2022, and 2021 were as follows: Pension Post-retirement U.S. International (in millions) 2023 2022 2021 2023 2022 2021 2023 2022 2021 Current year actuarial loss (gain) $ 1.6 $ ( 1.0 ) $ ( 10.3 ) $ 17.2 $ ( 23.9 ) $ ( 30.5 ) $ 0.1 $ ( 0.6 ) $ ( 0.5 ) Amortization of actuarial (loss) gain ( 2.2 ) ( 3.7 ) ( 3.6 ) ( 5.2 ) ( 5.1 ) ( 7.1 ) 0.5 0.5 0.5 Amortization of prior service cost — — ( 1.5 ) ( 0.3 ) ( 0.3 ) ( 0.3 ) — — — Foreign exchange rate changes — — — 7.5 ( 21.5 ) ( 4.1 ) ( 0.1 ) 0.2 — Total recognized in other comprehensive (loss) income ( 0.6 ) ( 4.7 ) ( 15.4 ) 19.2 ( 50.8 ) ( 42.0 ) 0.5 0.1 — Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income $ ( 2.5 ) $ ( 7.0 ) $ ( 16.7 ) $ 23.9 $ ( 51.6 ) $ ( 46.1 ) $ 0.2 $ ( 0.3 ) $ ( 0.4 ) Assumptions The weighted average assumptions used to determine benefit obligations for the years ended December 31, 2023, 2022, and 2021 were as follows: Pension Post-retirement U.S. International 2023 2022 2021 2023 2022 2021 2023 2022 2021 Discount rate 5.0 % 5.1 % 2.9 % 4.2 % 4.5 % 1.8 % 4.8 % 3.8 % 2.4 % Rate of compensation increase N/A N/A N/A 2.9 % 3.0 % 3.0 % N/A N/A N/A The weighted average assumptions used to determine net periodic benefit (income) cost for the years ended December 31, 2023, 2022, and 2021 were as follows: Pension Post-retirement U.S. International 2023 2022 2021 2023 2022 2021 2023 2022 2021 Discount rate 5.1 % 2.9 % 3.1 % 4.5 % 1.8 % 1.0 % 5.0 % 2.4 % 2.2 % Expected long-term rate of return 7.5 % 6.5 % 6.8 % 6.9 % 4.0 % 4.0 % N/A N/A N/A Rate of compensation increase N/A N/A N/A 3.0 % 3.0 % 2.7 % N/A N/A N/A The weighted average health care cost trend rates used to determine post-retirement benefit obligations and net periodic benefit (income) cost as of December 31, 2023, 2022, and 2021were as follows: Post-retirement 2023 2022 2021 Health care cost trend rate assumed for next year 9 % 6 % 6 % Rate that the cost trend rate is assumed to decline (the ultimate trend rate) 7 % 5 % 5 % Year that the rate reaches the ultimate trend rate 2031 2030 2030 Plan Assets The investment strategy for the Company is to optimize investment returns through a diversified portfolio of investments, taking into consideration underlying plan liabilities and asset volatility. Each plan has a different target asset allocation, which is reviewed periodically and is based on the underlying liability structure. The target asset allocation for our U.S. plan is 37 percent in equity securities, 57 percent in fixed income securities and 6 percent in alternative assets. The target asset allocation for non-U.S. plans is set by the local plan trustees. Our pension plan weighted average asset allocations as of December 31, 2023 and 2022 were as follows: 2023 2022 U.S. International U.S. International Asset category Equity securities 37 % 7 % 35 % 9 % Fixed income 57 % 63 % 58 % 56 % Real estate 4 % 3 % 4 % 3 % Other (4) 2 % 27 % 3 % 32 % Total 100 % 100 % 100 % 100 % (4) Multi-strategy hedge funds, commodity linked funds, private equity funds, and cash and cash equivalents for certain of our plans. U.S. Pension Plan Assets The fair value measurements of our U.S. pension plan assets by asset category as of December 31, 2023 were as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Fair Value as of (in millions) (Level 1) (Level 2) (Level 3) December 31, 2023 Mutual funds $ 106.1 $ — $ — $ 106.1 Exchange traded funds 38.3 — — 38.3 Common collective trust funds — 1.1 — 1.1 Total $ 144.4 $ 1.1 $ — $ 145.5 The fair value measurements of our U.S. pension plan assets by asset category as of December 31, 2022 were as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Fair Value as of (in millions) (Level 1) (Level 2) (Level 3) December 31, 2022 Mutual funds $ 105.3 $ — $ — $ 105.3 Exchange traded funds 33.8 — — 33.8 Common collective trust funds — 1.1 — 1.1 Total $ 139.1 $ 1.1 $ — $ 140.2 Mutual funds and exchange traded funds: The fair values of mutual fund and common stock fund investments are determined by obtaining quoted prices on nationally recognized securities exchanges (level 1 inputs). Common collective trusts : The fair values of participation units held in common collective trusts are based on their net asset values, as reported by the managers of the common collective trusts and as supported by the unit prices of actual purchase and sale transactions occurring as of or close to the financial statement date (level 2 inputs). International Pension Plans Assets The fair value measurements of our international pension plans assets by asset category as of December 31, 2023 were as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Fair Value as of (in millions) (Level 1) (Level 2) (Level 3) December 31, 2023 Cash and cash equivalents $ 6.4 $ — $ — $ 6.4 Equity securities 20.4 2.7 — 23.1 Corporate debt securities — 73.6 — 73.6 Multi-strategy hedge funds — 30.2 — 30.2 Insurance contracts — 4.1 — 4.1 Real estate — 3.7 — 3.7 Government debt securities — 131.3 — 131.3 Investments measured at net asset value (5) Multi-strategy hedge funds 24.7 Real estate 5.9 Private equity 21.9 Total $ 26.8 $ 245.6 $ — $ 324.9 (5) Certain investments that are measured at fair value using the net asset value per share practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in these tables are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the table that presents our defined benefit pension and post-retirement plans funded status. The fair value measurements of our international pension plans assets by asset category as of December 31, 2022 were as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Fair Value as of (in millions) (Level 1) (Level 2) (Level 3) December 31, 2022 Cash and cash equivalents $ 16.6 $ — $ — $ 16.6 Equity securities 25.2 — — 25.2 Corporate debt securities — 61.0 — 61.0 Multi-strategy hedge funds — 32.1 — 32.1 Insurance contracts — 3.8 — 3.8 Real estate — 2.2 — 2.2 Government debt securities — 109.1 — 109.1 Investments measured at net asset value (5) Multi-strategy hedge funds 30.2 Real estate 6.0 Private equity 20.2 Total $ 41.8 $ 208.2 $ — $ 306.4 Equity securities and exchange traded funds: The fair values of equity securities are determined by obtaining quoted prices on nationally recognized securities exchanges (level 1 inputs). Debt securities: Fixed income securities, such as corporate and government bonds and other debt securities, consist of index-linked securities. These debt securities are valued using quotes from independent pricing vendors based on recent trading activity and other relevant information, including market interest rate curves, referenced credit spreads, and estimated prepayment rates, where applicable (level 2 inputs). Insurance contracts: Valued at contributions made, plus earnings, less participant withdrawals and administrative expenses, which approximate fair value (level 2 inputs). Multi-strategy hedge funds : The fair values of participation units held in multi-strategy hedge funds are based on their net asset values, as reported by the managers of the funds and are based on the daily closing prices of the underlying investments (level 2 inputs). Real estate: Real estate consists of managed real estate investment trust securities (level 2 inputs). Cash Contributions We contributed $ 16.9 million to our pension and post-retirement plans in 2023 and expect to contribute approximately $ 16.0 million in 2024. The following table presents estimated future benefit payments to participants for the next ten fiscal years: (in millions) Pension Benefits Post-retirement Benefits 2024 $ 40.1 $ 0.3 2025 40.5 0.3 2026 40.5 0.3 2027 40.8 0.3 2028 41.7 0.3 Years 2029 - 2033 215.1 1.3 We also sponsor a number of defined contribution plans. Contributions are determined under various formulas. Costs related to such plans amounted to $ 12.5 million , $ 13.2 million and $ 12.7 million for the years ended December 31, 2023, 2022, and 2021, respectively. Multi-Employer Pension Plan We are a participant in a multi-employer pension plan. The plan has reported significant underfunded liabilities and declared itself in critical and declining status (red). As a result, the trustees of the plan adopted a rehabilitation plan ("RP") in an effort to forestall insolvency. Our required contributions to this plan could increase due to the shrinking contribution base resulting from the insolvency of or withdrawal of other participating employers, from the inability or the failure of withdrawing participating employers to pay their withdrawal liability, from lower than expected returns on pension fund assets, and from other funding deficiencies. In the event that we withdraw from participation in the plan, we will be required to make withdrawal liability payments for a period of 20 years or longer in certain circumstances. The present value of our withdrawal liability payments would be recorded as an expense in our Consolidated Statements of Income and as a liability on our Consolidated Balance Sheets in the first year of our withdrawal. The most recent Pension Protection Act ("PPA") zone status available in 2023 and 2022 is for the plan’s years ended December 31, 2022, and 2021, respectively. The zone status is based on information that we received from the plan and is certified by the plan’s actuary. Plans in the red zone (critical or critical and declining) are generally less than 65 percent funded, plans in the yellow zone (endangered) are less than 80 percent funded, and plans in the green zone (safe) are at least 80 percent funded. The Company's contributions are not more than 5 percent of the total contributions to the plan . Details regarding the plan are outlined in the table below. EIN/Pension Plan Pension Protection Act Zone Status FIP/RP Status Pending Contributions Year Ended December 31, Surcharge Expiration Date of Collective-Bargaining Pension Fund Number 2023 2022 Implemented 2023 2022 2021 Imposed Agreement PACE Industry Union-Management Pension Fund 11-6166763 / 001 Red Red Implemented $ 0.1 $ 0.1 $ 0.1 Yes 6/30/2028

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	6 . Stock-Based Compensation The 2022 ACCO Brands Corporation Incentive Plan (the "Plan") provides for stock-based awards generally in the form of stock options, restricted stock units ("RSUs") and performance stock units ("PSUs"), any of which may be granted alone or with other types of awards and dividend equivalents. The Plan authorizes the issuance of up to 15,994,631 shares to key employees and non-employee directors under the Plan. Beginning in 2018, the Company initiated a cash dividend to stockholders and began accruing dividend equivalents ("DEs") on all outstanding RSUs and PSUs as permitted by the Plan. DEs entitle holders of RSUs and PSUs to the same dividend value per share as holders of common stock. RSUs and PSUs are credited with DEs that are converted to RSUs and PSUs at the fair market value of our common stock on the dates the dividend payments are made and are subject to the same terms and conditions as the underlying award. DEs credited to RSUs and PSUs will only be paid to the extent the awards vest and any performance goals are achieved. We will satisfy the requirement for delivering shares of our common stock for the Plan by issuing new shares. The following table summarizes the impact of all stock-based compensation expense on our Consolidated Statements of (Loss) Income for the years ended December 31, 2023, 2022, and 2021: (in millions) 2023 2022 2021 Selling, general and administrative expense $ 14.8 $ 9.5 $ 15.2 Income (loss) before income tax ( 14.8 ) ( 9.5 ) ( 15.2 ) Income tax benefit ( 3.4 ) ( 2.2 ) ( 3.6 ) Net income (loss) $ ( 11.4 ) $ ( 7.3 ) $ ( 11.6 ) There was no capitalization of stock-based compensation expense. Stock-based compensation expense by award type for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 Stock option compensation expense $ 2.7 $ 3.7 $ 3.6 RSU compensation expense 6.4 4.4 5.3 PSU compensation expense 5.7 1.4 6.3 Total stock-based compensation expense $ 14.8 $ 9.5 $ 15.2 Stock Options The exercise price of each stock option equals or exceeds the fair market price of our stock on the date of grant. Options granted beginning in 2020 can generally be exercised over a term of ten years and prior to 2020 options could generally be exercised over a term of seven years . Stock options outstanding as of December 31, 2023 , generally vest ratably over three years from the grant date. There were no stock options granted during the year ended December 31, 2023 . The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model and the weighted average assumptions as outlined in the following table: Year Ended December 31, 2022 2021 Weighted average expected lives 6.0 years 6.0 years Weighted average risk-free interest rate 1.89 % 0.93 % Weighted average expected volatility 41.7 % 41.3 % Expected dividend yield 3.60 % 3.07 % Weighted average grant date fair value $ 2.43 $ 2.45 The weighted average expected option term of the Company's "plain vanilla" stock options granted during the years ended December 31, 2022 and 2021 reflect the application of the simplified method, as prescribed by Staff Accounting Bulletin Topic 14. The simplified method was used as the Company does not believe it has sufficient historical exercise data to provide a reasonable basis for the expected term of its stock option grants. The simplified method will be used until such time as the Company has stock option exercise experience in which to reasonably determine the expected life. The risk-free interest rate for the expected term of the option is based on the U.S. Treasury yield curve in effect at the time of grant. Volatility is calculated using ACCO Brands' historic volatility. A summary of the changes in stock options outstanding under the Plan during the year ended December 31, 2023 is presented below: Number Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Outstanding at December 31, 2022 6,728,615 $ 9.27 Forfeited ( 103,389 ) $ 9.70 Outstanding at December 31, 2023 6,625,226 $ 9.26 5.3 years zero Exercisable shares at December 31, 2023 5,015,909 $ 9.55 4.4 years zero There were no options exercised during the year ended December 31, 2023. We received cash of $ 4.3 million and $ 3.1 million from the exercise of stock options during the years ended December 31, 2022 and 2021, respectively. The aggregate intrinsic value of options exercised during the years ended December 31, 2022 and 2021 totaled $ 0.5 million and $ 1.0 million , respectively. The fair value of options vested during the years ended December 31, 2023, 2022, and 2021 was $ 3.4 million , $ 3.1 million and $ 2.7 million , respectively. As of December 31, 2023, we had unrecognized compensation expense related to stock options of $ 0.8 million , which will be recognized over a weighted-average period of 1.0 years. Stock Unit Awards RSUs vest over a pre-determined period of time, generally three years from the date of grant. Stock-based compensation expense for the years ended December 31, 2023, 2022, and 2021 includes $ 1.3 million , $ 1.2 million and $ 0.7 million , respectively, of expense related to RSUs granted to non-employee directors as a component of their compensation. RSUs granted to non-employee directors prior to 2021 became fully vested on the grant date; after 2021 non-employee director RSUs fully vest on the first anniversary of the grant date. PSUs also vest over a pre-determined period of time, generally not longer than three years , but are further subject to the achievement of certain business performance criteria being met during the three-year performance period. Based upon the level of achieved performance, the number of shares actually awarded can vary from 0 percent to 200 percent of the original grant. There were 3,444,450 RSUs outstanding as of December 31, 2023. All outstanding RSUs as of December 31, 2023 vest within three years of their date of grant. Upon vesting, all of the RSU awards will be converted into the right to receive one share of common stock of the Company for each unit that vests. The cost of these awards is determined using the fair value of the shares on the date of grant, and compensation expense is generally recognized over the period during which the employee provides the requisite service to the Company. A summary of the changes in the RSUs outstanding under the Plan during 2023 is presented below: Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2022 2,016,120 $ 8.43 Granted 1,969,191 $ 5.23 Vested and distributed ( 536,132 ) $ 8.26 Forfeited and cancelled ( 4,729 ) $ 8.46 Outstanding at December 31, 2023 3,444,450 $ 6.63 Vested and deferred at December 31, 2023 (1) 673,883 $ 8.65 (1) Included in outstanding at December 31, 2023 . Vested and deferred RSUs are primarily related to deferred compensation for non-employee directors. For the years ended December 31, 2022 and 2021, we granted 695,057 and 362,750 RSUs, respectively. The weighted-average grant date fair value of our RSUs was $ 5.23 , $ 8.15 , and $ 8.78 for the years ended December 31, 2023, 2022, and 2021, respectively. The fair value of RSUs that vested during the years ended December 31, 2023, 2022, and 2021 was $ 4.4 million , $ 5.1 million and $ 4.2 million , respectively. As of December 31, 2023, we have unrecognized compensation expense related to RSUs of $ 8.2 million , which will be recognized over a weighted-average period of 2.0 years. A summary of the changes in the PSUs outstanding under the Plan during 2023 is presented below: Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2022 673,169 $ 8.42 Granted 2,301,907 $ 5.39 Vested ( 336,077 ) $ 8.42 Other - decrease due to performance of PSUs ( 867,309 ) $ 4.34 Outstanding at December 31, 2023 1,771,690 $ 6.48 For the years ended December 31, 2022 and 2021, we granted 1,170,884 and 1,667,012 PSUs, respectively. For the years ended December 31, 2023, 2022, and 2021, 336,077 , 350,656 and zero PSUs vested, respectively. The weighted-average grant date fair value of our PSUs was $ 5.39 , $ 8.88 , and $ 8.42 for the years ended December 31, 2023, 2022, and 2021, respectively. The fair value of PSUs that vested during the years ended December 31, 2023, 2022, and 2021 was $ 2.8 million , $ 3.0 million and zero , respectively. Based on the level of achievement of the performance targets associated with the PSU awards, as of December 31, 2023, we have $ 5.0 million of unrecognized compensation expense, which will be recognized over a weighted-average period of 1.9 years.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
Inventories	7 . Inventories The components of inventories were as follows: December 31, (in millions) 2023 2022 Raw materials $ 50.1 $ 76.8 Work in process 4.7 4.4 Finished goods 272.7 314.0 Total inventories $ 327.5 $ 395.2

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	8 . Property, Plant and Equipment, Net The components of net property, plant and equipment were as follows: December 31 (in millions) 2023 2022 Land and improvements $ 20.9 $ 20.6 Buildings and improvements to leaseholds 130.7 125.3 Machinery and equipment 442.9 439.5 Construction in progress 5.1 3.8 599.6 589.2 Less: accumulated depreciation ( 429.5 ) ( 404.1 ) Net property, plant and equipment (1) $ 170.1 $ 185.1 (1) Net property, plant and equipment as of December 31, 2023 and 2022 contained $ 37.9 million and $ 52.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $ 14.1 million , $ 13.9 million and $ 12.9 million for the years ended December 31, 2023, 2022, and 2021 , respectively.

Goodwill and Identifiable Intan

Goodwill and Identifiable Intangible Assets	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Identifiable Intangible Assets	9 . Goodwill and Identifiable Intangible Assets Goodwill We test goodwill for impairment at least annually and on an interim basis if an event or circumstance indicates that it is more likely than not that an impairment loss has been incurred. The result of our annual qualitative assessment performed during the second quarter, as of our measurement date of May 31, 2023, was that there were no triggering events that would make it more likely than no t that an impairment loss to our goodwill had been incurred in our North America, International and EMEA reporting units. During the fourth quarter of 2023 , our forecasted cash flows for our North America reporting unit further declined, including lower demand for our technology accessories, due to a weaker macroeconomic environment as well as tight inventory management by retail customers. As a result, we identified a triggering event indicating it was more likely than not that an impairment loss had been incurred. Accordingly, as of December 31, 2023, we completed an impairment assessment, on a quantitative basis, for goodwill for each of our three reporting units. The result of our assessment was that the fair value of the North America reporting unit did not exceed its carrying value resulting in an impairment charge of $ 89.5 million . The result of our assessments for the International and EMEA reporting units was that the fair value of each exceeded its carrying values by approximately ten percent and greater than fifty percent, respectively, and we concluded that no impairment existed. Estimating the fair value of each reporting unit requires us to make assumptions and estimates regarding our future. We utilized a combination of both a discounted cash flows and market approach. The financial projections used in the valuation models reflected management's assumptions regarding revenue growth rates, economic and market trends, cost structure, discount rate, and other expectations about the anticipated short-term and long-term operating results for each of our three reporting units. We believe the assumptions used in our goodwill impairment analysis are appropriate and result in reasonable estimates of the implied fair value of each reporting unit. However, given the economic environment and the uncertainties regarding the impact on our business, there can be no assurance that our estimates and assumptions, made for purposes of our goodwill impairment testing, will prove to be an accurate prediction of the future. If our assumptions regarding future performance are not achieved, we may be required to record additional goodwill impairment charges in future periods. Changes in the net carrying amount of goodwill by segment were as follows: (in millions) ACCO Brands North America ACCO Brands EMEA ACCO Brands International Total Balance at December 31, 2021 $ 446.7 $ 178.6 $ 177.2 $ 802.5 Goodwill impairment ( 98.7 ) — — ( 98.7 ) Foreign currency translation — ( 33.0 ) 0.7 ( 32.3 ) Balance at December 31, 2022 $ 348.0 $ 145.6 $ 177.9 $ 671.5 Goodwill impairment ( 89.5 ) — — ( 89.5 ) Foreign currency translation — 6.7 1.3 8.0 Balance at December 31, 2023 $ 258.5 $ 152.3 $ 179.2 $ 590.0 Identifiable Intangibles The Company's gross carrying value and accumulated amortization by class of identifiable intangible assets as of December 31, 2023 and 2022 were as follows: December 31, 2023 December 31, 2022 (in millions) Gross Carrying Amounts Accumulated Amortization Net Book Value Gross Carrying Amounts Accumulated Amortization Net Book Value Indefinite-lived intangible assets: Trade names (1) $ 295.1 $ ( 44.5 ) $ 250.6 $ 410.6 $ ( 44.5 ) $ 366.1 Amortizable intangible assets: Trade names 497.1 ( 142.0 ) 355.1 369.7 ( 123.0 ) 246.7 Customer and contractual relationships 362.4 ( 221.3 ) 141.1 356.9 ( 198.2 ) 158.7 Vendor relationships 82.4 ( 16.7 ) 65.7 82.4 ( 11.2 ) 71.2 Patents 8.2 ( 5.0 ) 3.2 8.1 ( 3.8 ) 4.3 Subtotal 950.1 ( 385.0 ) 565.1 817.1 ( 336.2 ) 480.9 Total identifiable intangibles $ 1,245.2 $ ( 429.5 ) $ 815.7 $ 1,227.7 $ ( 380.7 ) $ 847.0 (1) Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased. The Company’s intangible amortization expense was $ 43.4 million , $ 41.5 million and $ 46.3 million for the years ended December 31, 2023, 2022, and 2021, respectively. Estimated amortization expense for amortizable intangible assets for the next five years is as follows: (in millions) 2024 2025 2026 2027 2028 Estimated amortization expense (2) $ 42.1 $ 40.5 $ 38.4 $ 36.0 $ 33.8 (2) Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events. We test indefinite-lived intangibles for impairment at least annually as of our measurement date of May 31st and on an interim basis if an event or circumstance indicates that it is more likely than not that an impairment loss has been incurred. We performed this annual assessment, on a qualitative basis, for our indefinite-lived trade names in the second quarter of 2023 and concluded that no impairment loss had been incurred. Effective January 1, 2023, we changed the indefinite-lived Leitz ® trade name to an amortizable intangible asset and began amortizing the trade name on a straight-line basis over a life of 30 years. The change was made as a result of decisions regarding the Company's future use of the trade name.

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Restructuring	10 . Restructuring The Company recorded $ 27.2 million , $ 9.6 million and $ 6.0 million of restructuring charges for the years ended December 31, 2023, 2022 and 2021, respectively. Restructuring charges were primarily for severance costs related to cost reduction initiatives in our North America and EMEA segments in 2023 and for all segments in 2022 and 2021. The summary of the activity in the restructuring liability for the year ended December 31, 2023 was as follows: (in millions) Balance at December 31, 2022 Provision Cash Expenditures Non-cash Items/Currency Change Balance at December 31, 2023 Employee termination costs (1) $ 8.7 $ 26.1 $ ( 7.6 ) $ 0.3 $ 27.5 Other (2) — 1.1 ( 0.2 ) — 0.9 Total restructuring liability $ 8.7 $ 27.2 $ ( 7.8 ) $ 0.3 $ 28.4 (1) We expect the remaining $ 27.5 million of employee termination costs to be substantially paid within the next twelve months . (2) We expect the remaining $ 0.9 million in other costs to be substantially paid within the next twelve months . The summary of the activity in the restructuring accounts for the year ended December 31, 2022 was as follows: (in millions) Balance at December 31, 2021 Provision Cash Expenditures Non-cash Items/Currency Change Balance at December 31, 2022 Employee termination costs $ 3.4 $ 9.4 $ ( 4.0 ) $ ( 0.1 ) $ 8.7 Termination of lease agreements 1.1 ( 0.2 ) ( 0.9 ) — — Other — 0.4 ( 0.4 ) — — Total restructuring liability $ 4.5 $ 9.6 $ ( 5.3 ) $ ( 0.1 ) $ 8.7 The summary of the activity in the restructuring accounts for the year ended December 31, 2021 was as follows: (in millions) Balance at December 31, 2020 Provision Cash Expenditures Non-cash Items/Currency Change Balance at December 31, 2021 Employee termination costs $ 8.1 $ 5.2 $ ( 9.7 ) $ ( 0.2 ) $ 3.4 Termination of lease agreements 1.0 0.7 ( 1.1 ) 0.5 1.1 Other 0.2 0.1 ( 0.2 ) ( 0.1 ) — Total restructuring liability $ 9.3 $ 6.0 $ ( 11.0 ) $ 0.2 $ 4.5 Restructuring charges for the years ended December 31, 2023, 2022, and 2021 by reporting segment were as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ 16.7 $ 5.3 $ 4.4 ACCO Brands EMEA 8.9 3.4 0.5 ACCO Brands International 1.0 0.7 1.1 Corporate 0.6 0.2 — Total restructuring charges $ 27.2 $ 9.6 $ 6.0

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	11 . Income Taxes The components of (loss) income before income tax for the years ended December 31, 2023, 2022, and 2021 were as follows: (in millions) 2023 2022 2021 Domestic operations $ ( 124.8 ) $ ( 80.1 ) $ ( 5.6 ) Foreign operations 111.7 95.0 117.0 Total $ ( 13.1 ) $ 14.9 $ 111.4 The reconciliation of income taxes computed at the U.S. federal statutory income tax rate of 21 percent to our effective income tax rate for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 Income tax at U.S. statutory rate; 21 % $ ( 2.7 ) $ 3.1 $ 23.4 Unrecognized tax expense (benefits) 1.0 ( 7.6 ) ( 1.9 ) Impact of final GILTI regulations for 2018 and 2019 — — ( 1.0 ) Statutory tax rate changes 0.4 0.6 ( 6.8 ) Statutory tax law changes ( 3.6 ) — ( 1.2 ) State, local and other tax, net of federal benefit ( 1.3 ) 1.6 0.6 Impact from foreign inclusions ( 0.7 ) 4.0 1.2 U.S. effect of foreign dividends and withholding taxes 3.9 1.8 1.2 Foreign income taxed at a higher effective rate 4.2 3.1 2.9 Brazilian Tax Assessments impact ( 13.3 ) 1.9 0.5 Increase (decrease) in valuation allowance 5.4 3.4 ( 11.4 ) General business credit ( 2.2 ) ( 1.9 ) ( 2.1 ) Excess expense from stock-based compensation 0.6 0.5 0.5 Impairment of non-deductible goodwill 18.8 20.7 — Impact of legal entity rationalization — ( 4.1 ) — Prior period tax return adjustment ( 1.0 ) ( 0.1 ) ( 0.6 ) Other (decrease) increase ( 0.8 ) 1.1 4.2 Income taxes as reported $ 8.7 $ 28.1 $ 9.5 Effective tax rate ( 66.4 )% 188.6 % 8.5 % For 2023, we recorded income tax expense of $ 8.7 million on loss before taxes of $ 13.1 million , for an effective rate of ( 66.4 ) percent. The decrease in the effective rate versus 2022 was primarily due to the reduction in pretax book income, tax law changes allowing Brazilian taxes paid to be creditable for U.S. tax purposes, and the release of unrecognized tax benefits related to the Brazil Tax Assessments. For 2022, we recorded income tax expense of $ 28.1 million on income before taxes of $ 14.9 million , for an effective rate of 188.6 percent. The increase in the effective rate versus 2021 was primarily due to the impact of impairment of non-deductible goodwill and the 2021 tax benefits for beneficial adjustments to deferred taxes resulting from statutory tax rate changes and the release of the valuation allowance on the foreign tax credit carryforward. For 2021, we recorded income tax expense of $ 9.5 million on income before taxes of $ 111.4 million , for an effective rate of 8.5 percent. The components of the income tax expense for the years ended December 31, 2023, 2022, and 2021 were as follows: (in millions) 2023 2022 2021 Current expense Federal and other $ 0.2 $ 1.8 $ 2.0 Foreign 28.6 25.0 28.5 Total current income tax expense 28.8 26.8 30.5 Deferred expense (benefit) Federal and other $ ( 16.7 ) $ 6.8 $ ( 16.5 ) Foreign ( 3.4 ) ( 5.5 ) ( 4.5 ) Total deferred income tax (benefit) expense ( 20.1 ) 1.3 ( 21.0 ) Total income tax expense $ 8.7 $ 28.1 $ 9.5 The components of deferred tax assets (liabilities) as of December 31, 2023 and 2022 were as follows: (in millions) 2023 2022 Deferred tax assets Compensation and benefits $ 23.0 $ 15.5 Pension 23.4 23.2 Inventory 10.4 10.1 Other reserves 18.9 21.7 Accounts receivable 7.4 9.7 Foreign tax credit carryforwards 6.4 11.1 Net operating loss carryforwards 76.7 89.2 Interest expense carryforwards 26.3 17.0 Section 174 capitalization 17.3 7.3 General business tax credit carryforwards 3.4 — Other 5.2 0.6 Gross deferred income tax assets 218.4 205.4 Valuation allowance ( 59.2 ) ( 51.9 ) Net deferred tax assets 159.2 153.5 Deferred tax liabilities Depreciation ( 5.7 ) ( 8.9 ) Unremitted non-U.S. earnings accrual ( 4.0 ) ( 5.5 ) Identifiable intangibles ( 170.4 ) ( 182.9 ) Other — ( 0.6 ) Gross deferred tax liabilities ( 180.1 ) ( 197.9 ) Net deferred tax liabilities $ ( 20.9 ) $ ( 44.4 ) A valuation allowance of $ 59.2 million and $ 51.9 million as of December 31, 2023 and 2022 , respectively, has been established for deferred income tax assets. The $ 7.3 million increase in the valuation allowance in 2023 includes a $ 1.9 million increase resulting from foreign currency translation and an increase to our existing valuation allowance of $ 5.4 million. The valuation allowance is primarily related to net operating loss (the "NOL") carryforwards that may not be realized. Realization of the net deferred income tax assets is dependent upon generating sufficient taxable income prior to the expiration of the applicable carryforward periods. Although realization is not certain, management believes that it is more likely than not that the net deferred income tax assets will be realized. However, the amount of net deferred tax assets considered realizable could change in the near term if estimates of future taxable income during the applicable carryforward periods fluctuate. As of December 31, 2023, the Company has state NOL tax benefits of $ 12.9 million which will expire between December 31, 2024 and December 31, 2033. As of December 31, 2023, the Company has $ 3.4 million of federal general business credit carryforwards which will expire on December 31, 2043. As of December 31, 2023, the Company had $ 6.4 million of foreign tax credit carryforwards which will expire on December 31, 2027. As of December 31, 2023, the Company has foreign NOLs of $ 281.3 million and tax benefits of $ 63.8 million , most of which have unlimited carryforward periods. As of December 31, 2023, the Company has recorded $ 4.0 million of deferred taxes on approximately $ 249.2 million of unremitted earnings of non-U.S. subsidiaries that may be remitted to the U.S. The Company has approximately $ 272.7 million of additional unremitted earnings of non-U.S. subsidiaries, which are indefinitely reinvested and for which no deferred taxes have been provided. A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 Balance at beginning of year $ 39.1 $ 43.3 $ 45.1 Additions for tax positions of prior years 3.6 2.5 4.5 Reductions for tax positions of prior years ( 17.7 ) ( 8.3 ) ( 4.2 ) Increase (decrease) resulting from foreign currency translation 3.0 1.6 ( 2.1 ) Balance at end of year $ 28.0 $ 39.1 $ 43.3 As of December 31, 2023, the amount of unrecognized tax benefits decreased to $ 28.0 million , all of which would impact our effective tax rate, if recognized. We expect the amount of unrecognized tax benefits to change within the next twelve months including releases of previously recorded reserves of approximately $ 1.5 to $ 2.5 million. Interest and penalties related to unrecognized tax benefits are recognized within "Income tax expense" in the Consolidated Statements of Income. As of December 31, 2023, we have accrued a cumulative $ 15.8 million for interest and penalties on the unrecognized tax benefits primarily related to the Brazil Tax Assessments. As of December 31, 2023 , the U.S. federal statute of limitations remains open for the year 2019 and forward. Foreign and U.S. state jurisdictions have statutes of limitations generally ranging from 2 to 6 years . As of December 31, 2023 , years still open to examination by foreign tax authorities in major jurisdictions include Australia ( 2018 forward), Brazil ( 2018 forward), Canada ( 2018 forward), Germany ( 2020 forward), Sweden ( 2021 forward) and the U.K. ( 2021 forward). We are currently under examination in various foreign jurisdictions. Organisation for Economic Co-operation and Development (“OECD”) Global Anti-Base Erosion Model Rules (Pillar Two) Legislatures and taxing authorities in many jurisdictions in which we operate may enact changes to, or seek to enforce, novel interpretations of their tax rules. These changes may include modifications that can be temporary or permanent. For example, the Organisation for Economic Cooperation and Development (the "OECD"), the European Union and other countries (including countries in which we operate) have committed to enacting substantial changes to numerous long-standing tax principles impacting how large multinational enterprises are taxed. In particular, the OECD's Pillar Two initiative introduces a 15 % global minimum tax applied on a country-by-country basis and for which many jurisdictions have now committed to an effective enactment date starting January 1, 2024. Management is currently assessing the impact and materiality of these potential new rules as well as any other changes in domestic and international tax rules and regulations. Brazil Tax Assessments In connection with our May 1, 2012, acquisition of the Mead Consumer and Office Products business ("Mead C&OP"), we assumed all of the tax liabilities for the acquired foreign operations including ACCO Brazil. In December of 2012, the Federal Revenue Department of the Ministry of Finance of Brazil ("FRD") issued a tax assessment against ACCO Brazil, challenging the tax deduction of goodwill from ACCO Brazil's taxable income for the year 2007 (the "First Assessment"). A second assessment challenging the deduction of goodwill from ACCO Brazil's taxable income for the years 2008, 2009 and 2010 was issued by FRD in October 2013 (the "Second Assessment" and together with the First Assessment, the "Brazil Tax Assessments"). The final administrative appeal of the Second Assessment was decided against the Company in 2017. In 2018, we challenged this decision to the first judicial level. In the fourth quarter of 2022, this case was decided against the Company by the first level judicial court. We have appealed this decision to the second judicial level. In the event we do not prevail at the judicial level, we will be required to pay an additional penalty representing attorneys' costs and fees. Accordingly, in the first quarter of 2019, the Company recorded an additional reserve in the amount of $ 5.6 million. In connection with the judicial challenge, we were required to provide security to guarantee payment of the Second Assessment should we not prevail. In the third quarter of 2020, the final administrative appeal of the First Assessment was decided against the Company and we determined that we would challenge this decision. In 2022, we challenged this adverse decision in the tax authority's lawsuit at the judicial level seeking to collect the tax. In connection with the judicial challenge, we were required to provide security to guarantee payment of the First Assessment should we not prevail. We believe we have meritorious defenses and intend to vigorously contest both of the Brazil Tax Assessments; however, there can be no assurances that we will ultimately prevail. The ultimate outcome will not be determined until the Brazilian judicial process is complete. It is possible we could have a final decision regarding the Second Assessment in the next two years. If the FRD's initial position is ultimately sustained, payment of the amount assessed would materially and adversely affect our cash flow in the year of settlement. Because there is no settled legal precedent on which to base a definitive opinion as to whether we will ultimately prevail, we consider the outcome of this dispute to be uncertain. Since it is not more likely than not that we will prevail, in 2012, we recorded a reserve in the amount of $ 44.5 million (at December 31, 2012 exchange rates) in consideration of this contingency, of which $ 43.3 million was recorded as an adjustment to the purchase price and which included the 2007-2012 tax years plus penalties and interest through December 2012. During the third quarter of 2023, there was a change in Brazilian law which allowed us to seek cancellation of the 75 percent standard penalty that would be payable in the event we do not prevail in our actions challenging the Brazil Tax Assessments. Following completion of the necessary administrative procedures, during the fourth quarter of 2023, the Company reduced its reserve for this contingency by $ 13.3 million, representing the amount of the cancelled penalties, as well as interest and other fees related to those penalties. We will continue to actively monitor administrative and judicial court decisions and evaluate their impact, if any, on our legal assessment of the ultimate outcome of our disputes. In addition, we will continue to accrue interest related to this contingency until such time as the outcome is known or until evidence is presented that we are more likely than not to prevail. During the years ended December 31, 2023, 2022, and 2021, we accrued additional interest as a charge to current income tax expense of $ 0.9 million , $ 1.5 million and $ 0.5 million , respectively. Our accrual through December 31, 2023, including tax, penalties and interest, is $ 21.7 million (at December 31, 2023 exchange rates, reported in "Other non-current liabilities").

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Earnings per Share	12 . Earnings per Share Total outstanding shares as of December 31, 2023, 2022, and 2021 were 94.9 million , 94.3 million and 95.8 million , respectively. Under our stock repurchase authorization, for each of the years ended December 31, 2023 and 2021 , we did no t repurchase and retire any shares. For the year ended December 31, 2022 there were 2.7 million shares repurchased and retired. For the years ended December 31, 2023, 2022, and 2021, we acquired 0.3 million , 0.3 million and 0.1 million shares, respectively, related to tax withholding in connection with stock-based compensation. The calculation of basic earnings per share of common stock is based on the weighted-average number of shares of common stock outstanding in the year, or period, over which they were outstanding. Our calculation of diluted earnings per share of common stock assumes that any shares of common stock outstanding were increased by shares that would be issued upon exercise of those stock awards for which the average market price for the period exceeds the exercise price less the shares that could have been purchased by the Company with the related proceeds, including compensation expense measured but not yet recognized. Our weighted-average shares outstanding for the years ended December 31, 2023, 2022, and 2021 were as follows: Year Ended December 31, (in millions) 2023 2022 2021 Weighted-average number of shares of common stock outstanding - basic 95.3 95.3 95.5 Effect of dilutive securities: Stock options — — 0.1 Restricted stock units — — 1.5 Weighted-average shares and assumed conversions - diluted (1) 95.3 95.3 97.1 (1) Due to the net loss during the twelve months ended December 31, 2023 and 2022, the denominator in the diluted earnings per share calculation does not include the effects of the stock awards for which the average market price for the period exceeds the exercised price, as it would result in a less dilutive computation. As a result, diluted earnings per share for the twelve months ended December 31, 2023 and 2022 are the same as basic earnings per share. Awards of potentially dilutive shares of common stock, which have exercise prices that were higher than the average market price during the period, are not included in the computation of dilutive earnings per share as their effect would have been anti-dilutive. For the years ended December 31, 2023, 2022, and 2021, the number of anti-dilutive shares were approximately 9.9 million , 9.8 million and 8.3 million , respectively.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	13 . Derivative Financial Instruments We are exposed to various market risks, including changes in foreign currency exchange rates and interest rate changes. We enter into financial instruments to manage and reduce the impact of these risks, not for trading or speculative purposes. The counterparties to these financial instruments are major financial institutions. We continually monitor our foreign currency exposures in order to maximize the overall effectiveness of our foreign currency hedge positions. Principal currencies hedged against the U.S. dollar include the Euro, Australian dollar, Canadian dollar, Swedish krona, British pound and Japanese yen. We are subject to credit risk, which relates to the ability of counterparties to meet their contractual payment obligations or the potential non-performance by counterparties to financial instrument contracts. Management continues to monitor the status of our counterparties and will take action, as appropriate, to further manage our counterparty credit risk. There are no credit contingency features in our derivative financial instruments. When hedge accounting is applicable, on the date we enter into a derivative, the derivative is designated as a hedge of the identified exposure. We measure the effectiveness of our hedging relationships both at hedge inception and on an ongoing basis. Forward Currency Contracts We enter into forward foreign currency contracts with third parties to reduce the effect of fluctuating foreign currencies, primarily on foreign denominated inventory purchases and intercompany loans. Our primary exposure to currency movements is in the Euro, the Swedish krona, the British pound, the Brazilian real, the Australian dollar, the Canadian dollar, and the Mexican peso. Forward currency contracts are used to hedge foreign denominated inventory purchases for Europe, Australia, Canada, Japan and New Zealand, and are designated as cash flow hedges. Unrealized gains and losses on these contracts are deferred in AOCI until the contracts are settled and the underlying hedged transactions relating to inventory purchases are recognized, at which time the deferred gains or losses will be reported in the "Cost of products sold" line in the Consolidated Statements of Income. As of December 31, 2023 and 2022, we had cash flow foreign exchange contracts outstanding with a U.S. dollar equivalent notional value of $ 80.2 million and $ 108.3 million , respectively, which were designated as hedges. Forward currency contracts used to hedge foreign denominated intercompany loans are not designated as hedging instruments. Gains and losses on these derivative instruments are recognized within "Other expense (income), net" in the Consolidated Statements of Income and are largely offset by the change in the current translated value of the hedged item. The periods of the forward foreign exchange contracts correspond to the periods of the hedged transactions, with some relating to intercompany loans which extend beyond December 2024. As of December 31, 2023 and 2022, we had foreign exchange contracts outstanding with a U.S. dollar equivalent notional value of $ 102.3 million and $ 79.5 million , respectively, which were not designated as hedges. The following table summarizes the fair value of our derivative financial instruments as of December 31, 2023 and 2022: Fair Value of Derivative Instruments Derivative Assets Derivative Liabilities (in millions) Balance Sheet Location December 31, December 31, Balance Sheet Location December 31, December 31, Derivatives designated as hedging instruments: Foreign exchange contracts Other current assets $ 0.3 $ 3.6 Other current liabilities $ 1.6 $ 1.9 Derivatives not designated as hedging instruments: Foreign exchange contracts Other current assets 1.0 0.7 Other current liabilities 0.1 0.7 Foreign exchange contracts Other non-current assets 3.2 4.9 Other non-current liabilities 3.2 4.9 Total derivatives $ 4.5 $ 9.2 $ 4.9 $ 7.5 The following tables summarize the pre-tax effect of the Company’s derivative financial instruments on the Consolidated Statements of Income for the years ended December 31, 2023, 2022, and 2021: The Effect of Derivative Instruments in Cash Flow Hedging Relationships on the Consolidated Financial Statements Amount of Gain (Loss) Recognized in AOCI (Effective Portion) Location of (Gain) Loss Reclassified from AOCI to Income Amount of (Gain) Loss Reclassified from AOCI to Income (Effective Portion) (in millions) 2023 2022 2021 2023 2022 2021 Cash flow hedges: Foreign exchange contracts $ 0.4 $ 9.8 $ 9.1 Cost of products sold $ ( 2.8 ) $ ( 14.0 ) $ 1.0 The Effect of Derivatives Not Designated as Hedging Instruments on the Consolidated Statements of (Loss) Income Location of (Gain) Loss Recognized in Income on Derivatives Amount of (Gain) Loss Recognized in Income (in millions) 2023 2022 2021 Foreign exchange contracts Other expense (income), net $ 0.1 $ ( 3.7 ) $ —

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	14 . Fair Value of Financial Instruments In establishing a fair value, there is a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The basis of the fair value measurement is categorized in three levels, in order of priority, as described below: Level 1 Unadjusted quoted prices in active markets for identical assets or liabilities Level 2 Unadjusted quoted prices in active markets for similar assets or liabilities, or Unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or Inputs other than quoted prices that are observable for the asset or liability Level 3 Unobservable inputs for the asset or liability We utilize the best available information in measuring fair value. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. We have determined that our financial assets and liabilities described in "Note 13 . Derivative Financial Instruments" are Level 2 in the fair value hierarchy. The following table sets forth our financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2023 and 2022: (in millions) December 31, December 31, Assets: Forward currency contracts $ 4.5 $ 9.2 Liabilities: Forward currency contracts $ 4.9 $ 7.5 Our forward currency contracts are included in "Other current assets," "Other current liabilities," "Other non-current assets," or "Other non-current liabilities." The forward foreign currency exchange contracts are primarily valued based on the foreign currency spot and forward rates quoted by banks or foreign currency dealers. As such, these derivative instruments are classified within Level 2. The fair values of cash and cash equivalents, notes payable to banks, accounts receivable and accounts payable approximate carrying amounts due principally to their short maturities. The carrying amount of total debt was $ 925.6 million and $ 1,004.9 million , and the estimated fair value of total debt was $ 870.9 million and $ 910.0 million , each as of December 31, 2023 and 2022, respectively. The fair values are determined from quoted market prices, where available, and from using current interest rates based on credit ratings and the remaining terms of maturity. Non-recurring Fair Value Measurements On a non-recurring basis, we remeasure the fair value of the goodwill of our reporting units and our trade name indefinite-lived intangibles if an event or circumstance indicates that it is more likely than not that an impairment loss has been incurred. The fair value of our reporting units and trade names are considered Level 3 measurements. Level 3 measurements require significant unobservable inputs that are reflected in our assumptions. See "Note 8 . Goodwill and Identifiable Intangible Assets" for more information.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	15 . Accumulated Other Comprehensive Income (Loss) AOCI is defined as net (loss) income and other changes in stockholders’ equity from transactions and other events from sources other than stockholders. The components of, and changes in, AOCI were as follows: (in millions) Derivative Financial Instruments Foreign Currency Adjustments Unrecognized Pension and Other Post-retirement Benefit Costs Accumulated Other Comprehensive Income (Loss) Balance at December 31, 2021 $ 4.0 $ ( 342.2 ) $ ( 197.3 ) $ ( 535.5 ) Other comprehensive income (loss) before reclassifications, net of tax 7.0 ( 37.9 ) 29.1 ( 1.8 ) Amounts reclassified from accumulated other comprehensive income (loss), net of tax ( 9.9 ) — 6.9 ( 3.0 ) Balance at December 31, 2022 $ 1.1 $ ( 380.1 ) $ ( 161.3 ) $ ( 540.3 ) Other comprehensive income (loss) before reclassifications, net of tax 0.2 30.3 ( 20.0 ) 10.5 Amounts reclassified from accumulated other comprehensive income (loss), net of tax ( 2.0 ) — 5.5 3.5 Balance at December 31, 2023 $ ( 0.7 ) $ ( 349.8 ) $ ( 175.8 ) $ ( 526.3 ) The reclassifications out of AOCI for the years ended December 31, 2023, 2022, and 2021 were as follows: Year ended December 31, (in millions) 2023 2022 2021 Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Location on Income Statement Gain (loss) on cash flow hedges: Foreign exchange contracts $ 2.8 $ 14.0 $ ( 1.0 ) Cost of products sold Tax (expense) benefit ( 0.8 ) ( 4.1 ) 0.2 Income tax expense Net of tax $ 2.0 $ 9.9 $ ( 0.8 ) Defined benefit plan items: Amortization of actuarial loss (1) $ ( 5.9 ) $ ( 8.2 ) $ ( 10.2 ) Amortization of prior service cost (1) ( 0.3 ) ( 0.3 ) ( 1.8 ) Total before tax ( 6.2 ) ( 8.5 ) ( 12.0 ) Tax benefit 0.7 1.6 2.9 Income tax expense Net of tax $ ( 5.5 ) $ ( 6.9 ) $ ( 9.1 ) Total reclassifications for the period, net of tax $ ( 3.5 ) $ 3.0 $ ( 9.9 ) (1) These AOCI components are included in the computation of net periodic benefit (income) cost for pension and post-retirement plans (See "Note 5 . Pension and Other Retiree Benefits" for additional details).

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue Recognition	16 . Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to our customers in an amount reflective of the consideration we expect to be received in exchange for those goods or services. Taxes we collect concurrent with revenue producing activities are excluded from revenue. Incidental items incurred that are immaterial in the context of the contract are expensed. At the inception of each contract, the Company assesses the products and services promised and identifies each distinct performance obligation. To identify the performance obligations, the Company considers all products and services promised regardless of whether they are explicitly stated or implied within the contract or by standard business practices. Freight and distribution activities performed before the customer obtains control of the goods are not considered promised services under customer contracts and therefore are not distinct performance obligations. The Company has chosen to account for shipping and handling activities as a fulfillment activity, and therefore accrues the expense of freight and distribution in "Cost of products sold" when product is shipped. Service or Extended Maintenance Agreements ("EMAs"). As of December 31, 2022, there was $ 2.8 million of unearned revenue associated with outstanding EMAs, primarily reported in "Other current liabilities." During the year ended December 31, 2023, $ 2.4 million of the unearned revenue was earned and recognized. As of December 31, 2023, the amount of unearned revenue from EMAs was $ 2.9 million . We expect to earn and recognize approximately $ 2.5 million of the unearned amount in the next 12 months and $ 0.4 million in periods beyond the next 12 months . The following tables present our net sales disaggregated by regional geography (1) , based upon our reporting business segments for the years ended December 31, 2023, 2022, and 2021, and our net sales disaggregated by the timing of revenue recognition for the years ended December 31, 2023, 2022, and 2021: (in millions) 2023 2022 2021 United States $ 792.2 $ 889.2 $ 934.2 Canada 95.0 108.8 108.2 ACCO Brands North America 887.2 998.0 1,042.4 ACCO Brands EMEA (1) 547.2 580.3 662.9 Australia/N.Z. 118.5 125.6 140.3 Latin America 244.5 197.5 125.5 Asia-Pacific 35.4 46.2 54.2 ACCO Brands International 398.4 369.3 320.0 Net sales (2) $ 1,832.8 $ 1,947.6 $ 2,025.3 (1) ACCO Brands EMEA is comprised largely of Europe, but also includes export sales to the Middle East and Africa. (2) Net sales are attributed to geographic areas based on the location of the selling subsidiaries . (in millions) 2023 2022 2021 Product and services transferred at a point in time $ 1,794.1 $ 1,899.5 $ 1,975.9 Product and services transferred over time 38.7 48.1 49.4 Net sales $ 1,832.8 $ 1,947.6 $ 2,025.3

Information on Business Segment

Information on Business Segments	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Information on Business Segments	17 . Information on Business Segments The Company has three operating business segments, each of which is comprised of different geographic regions. The Company's three operating segments are as follows: Operating Segment Geography Primary Brands Primary Products ACCO Brands North America United States and Canada PowerA ® , Five Star ® , AT-A-GLANCE ® , Quartet ® , Kensington ® , Swingline ® , GBC ® , Mead ® , Hilroy ® Computer and gaming accessories, school products, planners, storage and organization, dry erase boards and accessories, laminating, stapling and punching products. ACCO Brands EMEA Europe, Middle East and Africa Leitz ® , Rapid ® , Kensington ® , Esselte ® , Rexel ® , PowerA ® , GBC ® , NOBO ® , Derwent ® Storage and organization products (lever-arch binders, sheet protectors, indexes), computer and gaming accessories, stapling, punching, shredding, laminating, do-it-yourself tools, dry erase boards and writing and art products ACCO Brands International Australia/N.Z., Latin America and Asia-Pacific Tilibra ® , GBC ® , Kensington ® , Marbig ® , Foroni ® , Barrilito ® , Artline ®* , PowerA ® , Spirax ® *Australia/N.Z. only School notebooks, storage and organization products (binders, sheet protectors and indexes), computer and gaming accessories, laminating, shredding, writing and arts products, janitorial supplies, dry erase boards and stapling and punching products Each business segment designs, markets, sources, manufactures, and sells recognized consumer, technology and business branded products used in schools, homes and at work. Product designs are tailored to end-user preferences in each geographic region, and where possible, leverage common engineering, design, and sourcing. Our product categories include gaming and computer accessories; storage and organization; notebooks; shredding; laminating and binding machines; stapling; punching; planners; dry erase boards; and do-it-yourself tools, among others. Our portfolio includes both globally and regionally recognized brands. Beginning on January 1, 2024, the Company will reorganize our previously reported North America, EMEA and International operating segments into two operating segments, Americas and International. The Americas will include the U.S., Canada, Brazil, Mexico and Chile and the International reportable segment will include EMEA, Australia, New Zealand and Asia. This change will simplify and delayer the Company's operating structure and reduce costs through headcount reductions, supply change optimization, global footprint rationalization, and better leverage of our sourcing capabilities. The Company will recast prior period comparable results in early 2024 to reflect this operating segment change. Customers We distribute our products through a wide variety of channels to ensure that our products are readily and conveniently available for purchase by consumers and other end-users, wherever they prefer to shop. These channels include mass retailers, e-tailers, discount, drug/grocery and variety chains, warehouse clubs, hardware and specialty stores, independent office product dealers, office superstores, wholesalers, contract stationers, and specialist technology businesses. We also sell directly through e-commerce sites and our direct sales organization. Net sales by reportable business segment for the years ended December 31, 2023, 2022, and 2021 were as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ 887.2 $ 998.0 $ 1,042.4 ACCO Brands EMEA 547.2 580.3 662.9 ACCO Brands International 398.4 369.3 320.0 Net sales $ 1,832.8 $ 1,947.6 $ 2,025.3 Operating (loss) income by reportable business segment for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ ( 5.9 ) $ ( 4.9 ) $ 121.9 ACCO Brands EMEA 38.7 21.7 61.7 ACCO Brands International 60.7 50.5 31.6 Segment operating (loss) income 93.5 67.3 215.2 Change in fair value of contingent consideration — 9.0 ( 19.0 ) Corporate (1) ( 48.8 ) ( 41.5 ) ( 45.2 ) Operating income (2) 44.7 34.8 151.0 Interest expense 58.6 45.6 46.3 Interest income ( 7.1 ) ( 8.3 ) ( 1.9 ) Non-operating pension expense (income) 1.8 ( 4.5 ) ( 7.9 ) Other expense (income), net 4.5 ( 12.9 ) 3.1 (Loss) income before income tax $ ( 13.1 ) $ 14.9 $ 111.4 (1) Corporate operating loss in 2021 includes transaction costs of $ 0.2 million primarily for legal and due diligence expenditures associated with acquisitions. (2) Operating income as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less SG&A expenses; iv) less amortization of intangibles; v) less restructuring charges; and vi) less change in the fair value of contingent consideration. The following table presents the measure of reportable business segment assets used by the Company’s chief operating decision maker as of December 31, 2023 and 2022: (in millions) 2023 2022 ACCO Brands North America (3) $ 401.4 $ 459.2 ACCO Brands EMEA (3) 217.1 236.0 ACCO Brands International (3) 338.5 308.4 Total segment assets 957.0 1,003.6 Unallocated assets 1,684.2 1,787.2 Corporate (3) 3.6 3.9 Total assets $ 2,644.8 $ 2,794.7 (3) Represents total assets, excluding goodwill and identifiable intangibles resulting from business acquisitions, intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs and right of use asset, leases. As a supplement to the presentation of reportable business segment assets presented above, the table below presents reportable business segment assets, including right of use asset, leases, the allocation of identifiable intangible assets and goodwill resulting from business combinations as of December 31, 2023 and 2022: (in millions) 2023 2022 ACCO Brands North America (4) $ 1,190.7 $ 1,359.9 ACCO Brands EMEA (4) 568.7 588.4 ACCO Brands International (4) 603.4 573.8 Total segment assets 2,362.8 2,522.1 Unallocated assets 278.4 268.7 Corporate (4) 3.6 3.9 Total assets $ 2,644.8 $ 2,794.7 (4) Represents total assets, excluding intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs. Capital spend by reportable business segment for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ 4.0 $ 8.8 $ 11.2 ACCO Brands EMEA 6.8 4.7 7.3 ACCO Brands International 4.5 4.2 2.7 Total capital spend $ 15.3 $ 17.7 $ 21.2 Depreciation expense by reportable business segment for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ 16.8 $ 20.1 $ 20.7 ACCO Brands EMEA 10.9 12.6 13.1 ACCO Brands International 5.0 5.2 5.6 Total depreciation $ 32.7 $ 37.9 $ 39.4 Property, plant and equipment, net by reportable business segment as of December 31, 2023, 2022 was as follows: (in millions) 2023 2022 U.S. $ 68.2 $ 82.3 Canada 1.5 1.7 ACCO Brands North America 69.7 84.0 ACCO Brands EMEA 60.9 62.9 Australia/N.Z. 9.5 10.0 Latin America 29.1 26.6 Asia-Pacific 0.9 1.6 ACCO Brands International 39.5 38.2 Property, plant and equipment, net $ 170.1 $ 185.1 Top Customers Net sales to our five largest customers totaled $ 609.0 million , $ 663.3 million and $ 720.9 million for the years ended December 31, 2023, 2022 and 2021, respectively. No customer exceeded 10 percent of net sales for the years ended December 31, 2023, 2022 and 2021. As of December 31, 2023 and 2022, our top five trade accounts receivable totaled $ 138.1 million and $ 125.6 million , respectively.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	18 . Commitments and Contingencies Pending Litigation - Brazil Tax Assessments In connection with our May 1, 2012 acquisition of the Mead C&OP business, we assumed all of the tax liabilities for the acquired foreign operations including ACCO Brazil. For further information, see "Note 11. Income Taxes - Brazil Tax Assessments " for details on tax assessments issued by the FRD against ACCO Brazil challenging the tax deduction of goodwill from ACCO Brazil's taxable income for the years 2007 through 2010. If the FRD's initial position is ultimately sustained, payment of the amount assessed would materially and adversely affect our cash flow in the year of settlement. Brazil Tax Credits In May 2021, the Supreme Court of Brazil issued its final ruling in a leading case related to the computation of certain indirect taxes which provides that the indirect tax base should not include the gross amount of the value-added tax known as "ICMS." The Supreme Court further ruled that taxpayers can recognize future operating credits ("Tax Credits") for excess indirect tax payments from past periods due to the inclusion of ICMS in the indirect tax base to the extent the taxpayer had filed judicial challenges seeking to recover excess tax payments prior to March 15, 2017 and for any excess tax payments made after March 15, 2017. ACCO Brazil filed legal actions requesting recovery of these excess tax payments by way of future Tax Credits covering various time periods prior to March 15, 2017. All of these cases have been finally decided in a court of law in favor of ACCO Brazil. During the first quarter of 2024, ACCO Brazil completed the necessary administrative steps which will allow it to benefit from additional Tax Credits and record a gain of approximately $ 1.9 million. The Tax Credits will be utilized against future tax obligations. Indústria Gráfica Foroni Ltda. ("Foroni"), in years prior to its acquisition by ACCO Brazil, also filed a legal action in Brazil to recover these excess indirect tax payments and this legal action has been finalized. Upon the expiration of the application status of limitations, we are required under agreements with the former owners of the Foroni business to remit certain recovered tax credits, less the applicable tax and expenses, to the extent the tax credits relate to a tax period prior to the acquisition date. As of December 31, 2023 and 2022 , we recorded $ 1.3 million and $ 11.1 million, respectively, which is included in "Other expense (income), net" on our Consolidated Statement of Income (Loss). Finalizing the remaining legal actions ACCO Brazil has filed will likely result in additional Tax Credits at some time in the future. The Tax Credits will be utilized against future tax obligations. Other Pending Litigation We are party to various lawsuits and regulatory proceedings, primarily related to alleged patent infringement, as well as other claims incidental to our business. In addition, we may be unaware of third-party claims of intellectual property infringement relating to our technology, brands, or products, and we may face other claims related to business operations. Any litigation regarding patents or other intellectual property could be costly and time-consuming and might require us to pay monetary damages or enter into costly license agreements. We also may be subject to injunctions against development and sale of certain of our products. It is the opinion of management that (other than the Brazil Tax Assessments) the ultimate resolution of currently outstanding matters will not have a material adverse effect on our financial condition, results of operations or cash flow. However, there is no assurance that we will ultimately be successful in our defense of any of these matters or that an adverse outcome in any matter will not affect our results of operations, financial condition or cash flow. Further, future claims, lawsuits and legal proceedings could materially and adversely affect our business, reputation, results of operations and financial condition. Unconditional Purchase Commitments Future minimum payments under unconditional purchase commitments, primarily for inventory purchase commitments as of December 31, 2023 were as follows: (in millions) 2024 $ 102.1 2025 6.9 2026 3.1 2027 0.2 2028 0.1 Thereafter 0.1 Total unconditional purchase commitments $ 112.5

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts and Reserves	12 Months Ended
	Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts and Reserves	Allowances for Doubtful Accounts Changes in the allowances for doubtful accounts were as follows: Year Ended December 31, (in millions) 2023 2022 2021 Balance at beginning of year $ 9.1 $ 10.0 $ 11.4 Additions charged to expense 1.3 0.5 0.9 Deductions - write offs ( 1.6 ) ( 1.5 ) ( 1.9 ) Foreign exchange changes 0.5 0.1 ( 0.4 ) Balance at end of year $ 9.3 $ 9.1 $ 10.0 Allowances for Sales Discounts and Other Credits Changes in the allowances for sales discounts and returns were as follows: Year Ended December 31, (in millions) 2023 2022 2021 Balance at beginning of year $ 15.6 $ 15.2 $ 12.2 Additions charged to expense 8.1 15.7 28.9 Deductions ( 11.8 ) ( 13.8 ) ( 25.8 ) Foreign exchange changes ( 0.3 ) ( 1.5 ) ( 0.1 ) Balance at end of year $ 11.6 $ 15.6 $ 15.2 Allowances for Cash Discounts Changes in the allowances for cash discounts were as follows: Year Ended December 31, (in millions) 2023 2022 2021 Balance at beginning of year $ 1.9 $ 2.4 $ 1.9 Additions charged to expense 20.7 22.9 22.8 Deductions - discounts taken ( 20.7 ) ( 23.3 ) ( 22.2 ) Foreign exchange changes 0.1 ( 0.1 ) ( 0.1 ) Balance at end of year $ 2.0 $ 1.9 $ 2.4 Warranty Reserves Changes in the reserve for warranty claims were as follows: Year Ended December 31, (in millions) 2023 2022 2021 Balance at beginning of year $ 6.4 $ 5.7 $ 6.1 Provision for warranties issued 3.8 5.3 2.9 Deductions - settlements made (in cash or in kind) ( 4.5 ) ( 4.3 ) ( 2.9 ) Foreign exchange changes 0.3 ( 0.3 ) ( 0.4 ) Balance at end of year $ 6.0 $ 6.4 $ 5.7 Income Tax Valuation Allowance Changes in the deferred tax valuation allowances were as follows: Year Ended December 31, (in millions) 2023 2022 2021 Balance at beginning of year $ 51.9 $ 52.4 $ 55.4 Net increase to valuation allowance - expense (benefit) 5.4 3.2 ( 2.2 ) Foreign exchange changes 1.9 ( 3.7 ) ( 0.8 ) Balance at end of year $ 59.2 $ 51.9 $ 52.4

Significant Accounting Polici_2

Significant Accounting Policies, Recent Accounting Pronouncements and Adopted Accounting Standards (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Consolidation policy	The consolidated financial statements include the accounts of ACCO Brands Corporation and its domestic and international subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates Our financial statements are prepared in conformity with generally accepted accounting principles in the U.S. ("GAAP"). Preparation of our financial statements requires us to make judgments, estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses presented for each reporting period in the financial statements and the related accompanying notes. Actual results could differ significantly from those estimates. We regularly review our assumptions and estimates, which are based on historical experience and, where appropriate, current business trends.
Cash and Cash Equivalents	Cash and Cash Equivalents Highly liquid investments with an original maturity of three months or less are included in cash and cash equivalents.
Accounts Receivable and Allowances for Sales/Pricing/Cash Discounts and Doubtful Accounts	Accounts Receivable and Allowances for Sales/Pricing/Cash Discounts and Doubtful Accounts Trade receivables are recorded at the stated amount, less allowances for sales/pricing/cash discounts and doubtful accounts. The allowance for sales/pricing/cash discounts represents estimated uncollectible receivables associated with the products previously sold to customers, and is recorded at the same time that the sales are recognized. The allowance is based on historical trends. The allowance for doubtful accounts represents estimated uncollectible receivables associated with potential customer defaults on contractual obligations, usually due to a customer's potential insolvency. The allowance includes amounts for certain customers where a risk of default has been specifically identified. In addition, the allowance includes a provision for customer defaults on a general formulaic basis when it is determined the risk of some default is probable and estimable, but cannot yet be associated with a specific customer. The assessment of the likelihood of customer defaults is based on various factors, including the length of time the receivables are past due, historical experience and existing economic conditions. The allowances are recorded as reductions to "Net sales" and "Accounts receivable, net."
Inventories	Inventories Inventories are priced at the lower of cost (principally first-in, first-out) or net realizable value. When necessary, the write-down of inventory to its net realizable value is recorded for obsolete or slow-moving inventory based on assumptions about future demand and marketability of products, the impact of new product introductions and specific identification of items, such as product discontinuance or engineering/material changes. These estimates could vary significantly, either favorably or unfavorably, from actual requirements if future economic conditions, customer inventory levels or competitive conditions differ from our expectations.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are carried at cost. Depreciation is provided, principally on a straight-line basis, over the estimated useful lives of the assets. Gains or losses resulting from dispositions are included in operating income. Betterments and renewals, which improve and extend the life of an asset are capitalized; maintenance and repair costs are expensed. Purchased computer software is capitalized and amortized over the software’s useful life. The following table shows estimated useful lives of property, plant and equipment: Property, plant and equipment Useful Life Buildings 40 to 50 years Leasehold improvements Lesser of lease term or the life of the asset Machinery, equipment and furniture 3 to 10 years Computer software 5 to 10 years We capitalize interest for major capital projects. Capitalized interest is added to the cost of the underlying assets and is depreciated over the useful lives of those assets. We did no t capitalize any interest for the years ended December 31, 2023, 2022, and 2021 .
Long-Lived Assets	Long-Lived Assets We test long-lived assets for impairment whenever events or changes in circumstances indicate that the assets’ carrying amount may not be recoverable from its undiscounted future cash flow. When such events occur, we compare the sum of the undiscounted cash flow expected to result from the use and eventual disposition of the asset or asset group to the carrying amount of a long-lived asset or asset group. The cash flows are based on our best estimate at the time of future cash flow, derived from the most recent business projections. If this comparison indicates that there is an impairment, the amount of the impairment is typically calculated using discounted expected future cash flow. The discount rate applied to these cash flows is based on our weighted average cost of capital, computed by selecting market rates at the valuation dates for debt and equity that are reflective of the risks associated with an investment in our industry as estimated by using comparable publicly traded companies.
Intangible Assets	Intangible Assets Intangible assets are comprised primarily of indefinite-lived and amortizable intangible assets acquired and arising from the application of purchase accounting. Indefinite-lived intangible assets are not amortized, but are evaluated at least annually to determine whether the indefinite useful life is appropriate. Certain of our trade names have been assigned an indefinite life as we currently anticipate that these trade names will contribute cash flows to ACCO Brands indefinitely. Amortizable intangible assets are amortized over their useful lives. We test indefinite-lived intangibles for impairment annually, during the second quarter, and during any interim period when market or business events indicate there may be a potential adverse impact on a particular intangible. The test may be on a qualitative or quantitative basis as allowed by GAAP. We consider the implications of both external factors (e.g., market growth, pricing, competition, and technology) and internal factors (e.g., product costs, margins, support expenses, and capital investment) and their potential impact on cash flows in both the near and long term, as well as their impact on any identifiable intangible asset associated with the business. Based on recent business results, consideration of significant external and internal factors, and the resulting business projections, indefinite-lived intangible assets are reviewed to determine whether they are likely to remain indefinite-lived, or whether a finite life is more appropriate. In addition, based on events in the period and future expectations, management considers whether the potential for impairment exists. Finite lived intangibles are amortized over 5 , 7 , 10 , 15 , 23 or 30 year s. We performed our annual assessment, in the second quarter of 2023 , on a qualitative basis, and concluded that it was not more likely than no t that the fair value of any indefinite-lived intangible was less than its carrying amount. In addition, we have not identified a triggering event through December 31, 2023 that more likely than not would result in impairment.
Goodwill	Goodwill Goodwill has been recorded on our balance sheet and represents the excess of the cost of an acquisition when compared with the fair value of the net assets acquired. The authoritative guidance on goodwill and other intangible assets requires that goodwill be tested for impairment at a reporting unit level. We have determined that our reporting units are ACCO Brands North America, ACCO Brands EMEA and ACCO Brands International. We test goodwill for impairment annually, during the second quarter, or any interim period when market or business events indicate there may be a potential adverse impact on goodwill. As permitted by GAAP, we may perform a qualitative assessment to determine if it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform a quantitative goodwill impairment test as required by GAAP. We performed our annual assessment in the second quarter of 2023 , on a qualitative basis, and concluded that it was no t more likely than not that the fair value of any reporting unit was less than its carrying amount. During the fourth quarter of 2023 , our forecasted cash flows for our North America reporting unit further declined, including lower demand for our technology accessories, due to a weaker macroeconomic environment as well as tight inventory management by retail customers. As a result, we identified a triggering event indicating it was more likely than not that an impairment loss had been incurred. Accordingly, as of December 31, 2023, we completed an impairment assessment, on a quantitative basis, for goodwill for each of our three reporting units. The result of our assessment was that the fair value of the North America reporting unit did not exceed its carrying value resulting in an impairment charge of $ 89.5 million . The result of our assessment for the International and EMEA reporting units was that the fair value of each exceeded its carrying values by approximately ten percent and greater than fifty percent, respectively, and we concluded that no impairment existed. Estimating the fair value of each reporting unit requires us to make assumptions and estimates regarding our future. We utilized a combination of both a discounted cash flows and market approach. The financial projections used in the valuation models reflected management's assumptions regarding revenue growth rates, economic and market trends, cost structure, discount rate, and other expectations about the anticipated short-term and long-term operating results for each of our three reporting units. We believe the assumptions used in our goodwill impairment analysis are appropriate and result in reasonable estimates of the implied fair value of each reporting unit. However, given the economic environment and the uncertainties regarding the impact on our business, there can be no assurance that our estimates and assumptions, made for purposes of our goodwill impairment testing, will prove to be an accurate prediction of the future. If our assumptions regarding future performance are not achieved, we may be required to record additional goodwill impairment charges in future periods.
Employee Benefit Plans	Employee Benefit Plans We provide a range of benefits to our employees and retired employees, including pension, post-retirement, post-employment and health care benefits. We record annual amounts relating to these plans based on calculations specified by GAAP, which include various actuarial assumptions, including discount rates, assumed rates of return, mortality rate tables, compensation increases, turnover rates and health care cost trends. Actuarial assumptions are reviewed on an annual basis and modifications to these assumptions are made based on current rates and trends when it is deemed appropriate. As required by GAAP, the effect of our modifications and unrecognized actuarial gains and losses are generally recorded to a separate component of accumulated other comprehensive income (loss) ("AOCI") in stockholders’ equity and amortized over future periods.
Income Taxes	Income Taxes Deferred tax liabilities or assets are established for temporary differences between financial and tax reporting basis and are subsequently adjusted to reflect changes in tax rates expected to be in effect when the temporary differences reverse. A valuation allowance is recorded to reduce deferred tax assets to an amount that is more likely than not to be realized. Facts and circumstances may change and cause us to revise our conclusions regarding our ability to realize certain net operating losses and other deferred tax attributes. The amount of income taxes that we pay is subject to ongoing audits by federal, state and foreign tax authorities. Our estimate of the potential outcome of any uncertain tax position is subject to management’s assessment of relevant risks, facts and circumstances existing at that time. We believe that we have adequately provided for reasonably foreseeable outcomes related to these matters. However, our future results may include favorable or unfavorable adjustments to our estimated tax liabilities in the period any assessments are received, revised or resolved. As of December 31, 2023, the Company has recorded $ 4.0 million of deferred taxes on approximately $ 249.2 million of unremitted earnings of non-U.S. subsidiaries that may be remitted to the U.S. The Company has approximately $ 272.7 million of additional unremitted earnings of non-U.S. subsidiaries, which are indefinitely reinvested and for which no deferred taxes have been provided.
Revenue Recognition	Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to our customers in an amount reflective of the consideration we expect to receive in exchange for those goods or services. Taxes we collect concurrent with revenue producing activities are excluded from revenue. Incidental items incurred that are immaterial in the context of the contract are expensed. At the inception of each contract, the Company assesses the products and services promised and identifies each distinct performance obligation. To identify the performance obligations, the Company considers all products and services promised regardless of whether they are explicitly stated or implied within the contract or by standard business practices. Products : For our products, we transfer control and recognize a sale primarily when we either ship the product from our manufacturing facility or distribution center, or upon delivery to a customer-specified location depending upon the terms in the customer agreement. In addition, we recognize revenue for private label products as the product is manufactured (or over time) when a contract has an enforceable right to payment. For consignment arrangements, revenue is not recognized until the products are sold to the end customer. Customer Program Costs : Customer programs and incentives ("Customer Program Costs") are a common practice in our industry. We incur Customer Program Costs to obtain favorable product placement, to promote sell-through of products and to maintain competitive pricing. The amount of consideration we receive and revenue we recognize is impacted by Customer Program Costs, including sales rebates; in-store promotional allowances; shared media and customer catalog allowances; other cooperative advertising arrangements; freight allowance programs offered to our customers; and allowances for discounts. We recognize Customer Program Costs, primarily as a deduction to gross sales, at the time that the associated revenue is recognized. Customer Program Costs are based on management's best estimates using the most likely amount method and is an amount that is probable of not being reversed. In the absence of a signed contract, estimates are based on historical or projected experience for each program type or customer. We adjust our estimate of revenue when the most likely amount of consideration we expect to receive changes. Service or Extended Maintenance Agreements ("EMAs"): Depending on the terms of the EMA, we may defer recognition of the consideration received for any unsatisfied obligations. We use an observable price to determine the stand-alone selling price for separate performance obligations or an estimated cost plus margin approach, for our separately priced service/maintenance agreements that extend mechanical and maintenance coverage beyond our base warranty coverage to our Print Finishing Solutions customers. These agreements range in duration from three to sixty month s, however, most agreements are one year or less. We generally receive payment at inception of the EMAs and recognize revenue over the term of the agreement on a straight-line basis. Shipping and Handling : Freight and distribution activities performed before the customer obtains control of the goods are not considered promised services under customer contracts and therefore are not distinct performance obligations. The Company has chosen to account for shipping and handling activities as a fulfillment activity, and therefore accrues the expense of freight and distribution in "Cost of products sold" when products are shipped. We reflect all amounts billed to customers for shipping and handling in net sales and the costs we incurred for shipping and handling (including costs to ship and move product from the seller’s place of business to the buyer’s place of business, as well as costs to store, move and prepare products for shipment) in cost of products sold. Reserve for Sales Returns: The reserve for sales returns represents estimated uncollectible receivables associated with the potential return of products previously sold to customers, and is recorded at the same time that the sales are recognized. The reserve includes a general provision for product returns based on historical trends. In addition, the reserve includes amounts for currently authorized customer returns that are considered to be abnormal in comparison to the historical trends. We record the returns reserve, on a gross basis, as a reduction to "Net sales" and "Cost of products sold" with increases to "Other current liabilities" and "Inventories."
Cost of Products Sold	Cost of Products Sold Cost of products sold includes all manufacturing, product sourcing and distribution costs, including depreciation related to assets used in the manufacturing, procurement and distribution process, allocation of certain information technology costs supporting those processes, inbound and outbound freight, shipping and handling costs, purchasing costs associated with materials and packaging used in the production processes, and inventory valuation adjustments.
Selling, General and Administrative Expenses	Selling, General and Administrative Expenses Selling, general and administrative expenses ("SG&A") include advertising, marketing, and selling (including commissions) expenses, research and development, customer service, depreciation related to assets outside the manufacturing and distribution processes and all other general and administrative expenses outside the manufacturing and distribution functions (e.g., finance, human resources, information technology, legal and other corporate expenses).
Advertising Expenses	Advertising Expenses Advertising expenses were $ 102.7 million , $ 108.8 million and $ 117.4 million for the years ended December 31, 2023, 2022 and 2021, respectively. These costs primarily include, but are not limited to, cooperative advertising and promotional allowances as described in " Customer Program Costs " above, and are principally expensed as incurred.
Warranty Reserves	Warranty Reserves We offer our customers various warranty terms based on the type of product that is sold. Estimated future obligations related to products sold under these warranty terms are provided by charges to cost of products sold in the same period in which the related revenue is recognized.
Research and Development Expenses	Research and Development Expenses Research and development expenses were $ 25.8 million , $ 26.3 million and $ 26.6 million for the years ended December 31, 2023, 2022 and 2021 , respectively, are classified as SG&A expenses and are charged to expense as incurred.
Stock-Based Compensation	Stock-Based Compensation Our primary types of stock-based compensation consist of stock options, restricted stock unit awards and performance stock unit awards. Stock-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized as expense over the requisite service period. Where awards are made with non-substantive vesting periods (for example, where a portion of the award vests due to retirement eligibility), we estimate and recognize expense based on the period from the grant date to the date on which the employee is retirement eligible. The Company accounts for forfeitures as they occur.
Foreign Currency Translation	Foreign Currency Translation Foreign currency balance sheet accounts are translated into U.S. dollars at the rates of exchange at the balance sheet date. Income and expenses are translated at the average rates of exchange in effect during the period. The related translation adjustments are made directly to a separate component of AOCI in stockholders’ equity. Some transactions are made in currencies different from an entity’s functional currency; gains and losses on these foreign currency transactions are included in the income statement.
Derivatives Financial Instruments	Derivative Financial Instruments We recognize all derivatives as either assets or liabilities on the balance sheet and record those instruments at fair value. If the derivative is designated as a fair value hedge and is effective, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings in the same period. If the derivative is designated as a cash flow hedge, the effective portions of changes in the fair value of the derivative are recorded in AOCI and are recognized in the Consolidated Statements of Income when the hedged item affects earnings. Ineffective portions of changes in the fair value of cash flow hedges are recognized in earnings. Certain forecasted transactions, and assets and liabilities are exposed to foreign currency risk. We continually monitor our foreign currency exposures in order to maximize the overall effectiveness of our foreign currency hedge positions. Principal currencies hedged against the U.S. dollar include the Euro, Australian dollar, Canadian dollar, Swedish krona, British pound and Japanese yen.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In November 2023, the Financial Accounting Standards Board ("FASB") issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and to provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. The ASU does not change how a public entity identifies its operating segments, aggregates them, or applies the quantitative thresholds to determine its reportable segments. This ASU is effective for annual periods beginning after December 15, 2023, and for interim periods beginning after December 15, 2024, with early adoption permitted. We are evaluating the effect this guidance will have on our segment disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which enhances the income tax disclosures to provide information to better assess how an entity’s operations and related tax risks and tax planning and operational opportunities affect its tax rate and prospects for future cash flows. This ASU is effective for annual periods beginning after December 15, 2024, with early adoption permitted. We are evaluating the effect this guidance will have on our tax disclosures. There were no other recently issued accounting standards that are expected to have an impact on the Company’s financial condition, results of operations or cash flow. Recently Adopted Accounting Standards In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848), which provides optional expedients and exceptions for applying current GAAP to contracts, hedging relationships, and other transactions affected by the transition from the use of LIBOR to an alternative reference rate. Effective in the fourth quarter of 2022, the Company adopted this standard. The adoption of this standard did not have a material impact on our consolidated financial statements. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which removes certain exceptions for investments, intraperiod allocations and interim calculations, and adds guidance to reduce complexity in accounting for income taxes. Effective January 1, 2021, the Company adopted this standard. The adoption of this standard did not have a material impact on our consolidated financial statements. There were no other accounting standards that were adopted in 2023, 2022, and 2021 that had a material effect on the Company’s financial condition, results of operations or cash flow.
Leases	The Company determines if an arrangement is a lease at inception. Leases are included in "Right of use asset, leases" ("ROU Assets"), and the current portion of the lease liability is included in "Lease liabilities" and the non-current portion is included in "Long-term lease liabilities" in the Consolidated Balance Sheet. The Company currently has an immaterial amount of financing leases and leases with terms of more than one month and less than 12 months. ROU Assets and lease liabilities are recognized based on the present value of lease payments over the lease term. Because most of the Company’s leases do not provide an implicit rate of return, the Company uses its incremental collateralized borrowing rate, on a regional basis, in determining the present value of lease payments. The incremental borrowing rate is dependent upon duration of the lease and has been segmented into three groups of time. All leases within the same region and the same group of time, share the same incremental borrowing rate. The Company has lease agreements with lease and non-lease components, which are combined for accounting purposes for all classes of assets except information technology equipment.

Significant Accounting Polici_3

Significant Accounting Policies, Recent Accounting Pronouncements and Adopted Accounting Standards (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Property, Plant and Equipment, Net	The following table shows estimated useful lives of property, plant and equipment: Property, plant and equipment Useful Life Buildings 40 to 50 years Leasehold improvements Lesser of lease term or the life of the asset Machinery, equipment and furniture 3 to 10 years Computer software 5 to 10 years The components of net property, plant and equipment were as follows: December 31 (in millions) 2023 2022 Land and improvements $ 20.9 $ 20.6 Buildings and improvements to leaseholds 130.7 125.3 Machinery and equipment 442.9 439.5 Construction in progress 5.1 3.8 599.6 589.2 Less: accumulated depreciation ( 429.5 ) ( 404.1 ) Net property, plant and equipment (1) $ 170.1 $ 185.1 (1) Net property, plant and equipment as of December 31, 2023 and 2022 contained $ 37.9 million and $ 52.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $ 14.1 million , $ 13.9 million and $ 12.9 million for the years ended December 31, 2023, 2022, and 2021 , respectively.

Long-term Debt and Short-term_2

Long-term Debt and Short-term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Summary of Notes Payable and Long-Term Debt	Notes payable and long-term debt, listed in order of the priority of security interests in assets of the Company, consisted of the following as of December 31, 2023 and 2022: (in millions) December 31, December 31, Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 5.93 % at December 31, 2023 and 3.90 % at December 31, 2022) $ 218.2 $ 227.4 USD Senior Secured Term Loan A, due March 2026 (floating interest rate of 7.50 % at December 31, 2023 and 6.40 % at December 31, 2022) 78.0 84.4 Australian Dollar Senior Secured Term Loan A, due March 2026 (floating interest rate of 6.42 % at December 31, 2023 and 5.30 % at December 31, 2022) 32.5 34.9 U.S. Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 7.40 % at December 31, 2023 and 6.36 % at December 31, 2022) 7.3 58.6 Australian Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 6.42 % at December 31, 2023 and 5.18 % at December 31, 2022) 14.3 14.2 Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25 %) 575.0 575.0 Other borrowings 0.3 10.4 Total debt 925.6 1,004.9 Less: Current portion 36.7 60.0 Debt issuance costs, unamortized 6.7 8.4 Long-term debt, net $ 882.2 $ 936.5
Schedule of Maximum Consolidated Leverage Ratio	the maximum Consolidated Leverage Ratio financial covenant from current levels for each of the five fiscal quarters beginning December 31, 2022, and ending December 31, 2023, as follows: Quarter Ended Maximum Consolidated Leverage Ratio December 2022 4.50 :1.00 March 2023 5.00 :1.00 June 2023 5.00 :1.00 September 2023 4.75 :1.00 December 2023 4.25 :1.00
Schedule of Applicable Rate and Undrawn Fee Based on Company's Consolidated Leverage Ratio	The current maturity of the Credit Agreement, as amended, is March 31, 2026 and the current pricing is as follows: Consolidated Leverage Ratio Applicable Rate on Euro/AUD/CDN Dollar Loans Applicable Rate on Base Rate Loans Undrawn Fee > 4.50 to 1.00 2.50 % 1.50 % 0.500 % ≤ 4.50 to 1.00 and > 4.00 to 1.00 2.25 % 1.25 % 0.375 % ≤ 4.00 to 1.00 and > 3.50 to 1.00 2.00 % 1.00 % 0.350 % ≤ 3.50 to 1.00 and > 3.00 to 1.00 1.75 % 0.75 % 0.300 % ≤ 3.00 to 1.00 and > 2.00 to 1.00 1.50 % 0.50 % 0.250 % ≤ 2.00 to 1.00 1.25 % 0.25 % 0.200 %

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Components of Lease Expense and Other Information	The components of lease expense for the years ended December 31, 2023, 2022, and 2021, were as follows: (in millions) 2023 2022 2021 Operating lease cost $ 28.6 $ 29.5 $ 29.7 Sublease income ( 2.5 ) ( 2.4 ) ( 1.9 ) Total lease cost $ 26.1 $ 27.1 $ 27.8 Other information related to leases for the years ended December 31, 2023, and 2022 was as follows: (in millions, except lease term and discount rate) 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 29.8 $ 30.5 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 23.2 $ 11.4 Weighted average remaining lease term: Operating leases 6 years Weighted average discount rate: Operating leases 5.2 %
Schedule of Future Minimum Lease Payments, Net of Sublease Income	Future minimum lease payments, net of sub-lease income, for all non-cancelable leases as of December 31, 2023 were as follows: (in millions) Operating 2024 $ 26.6 2025 24.4 2026 19.8 2027 14.5 2028 12.3 Thereafter 25.5 Total minimum lease payments 123.1 Less imputed interest 25.8 Future minimum payments for leases, net of sublease rental income and imputed interest $ 97.3

Pension and Other Retiree Ben_2

Pension and Other Retiree Benefits (Tables)	12 Months Ended
	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Schedule of Amounts Recognized in Balance Sheet Net Funded Status	The following table sets forth our defined benefit pension and post-retirement plans funded status and the amounts recognized in our Consolidated Balance Sheets: Pension Post-retirement U.S. International (in millions) 2023 2022 2023 2022 2023 2022 Change in projected benefit obligation (PBO) Projected benefit obligation at beginning of year $ 162.3 $ 212.5 $ 441.1 $ 673.6 $ 3.2 $ 4.3 Service cost — — 0.5 1.0 — — Interest cost 7.9 4.9 20.0 9.6 0.2 0.1 Actuarial loss (gain) 3.2 ( 45.2 ) 14.6 ( 158.7 ) 0.1 ( 0.6 ) Participants’ contributions — — 0.1 0.1 — — Benefits paid ( 10.8 ) ( 9.9 ) ( 27.0 ) ( 25.7 ) ( 0.3 ) ( 0.4 ) Settlement — — ( 3.9 ) — — — Termination benefits — — — 0.8 — — Foreign exchange rate changes — — 22.0 ( 59.6 ) 0.1 ( 0.2 ) Projected benefit obligation at end of year 162.6 162.3 467.4 441.1 3.3 3.2 Change in plan assets Fair value of plan assets at beginning of year 140.2 180.9 306.4 481.7 — — Actual return on plan assets 13.6 ( 33.3 ) 18.9 ( 117.2 ) — — Employer contributions 2.5 2.5 14.1 13.4 0.3 0.4 Participants’ contributions — — 0.1 0.1 — — Benefits paid ( 10.8 ) ( 9.9 ) ( 27.0 ) ( 25.7 ) ( 0.3 ) ( 0.4 ) Settlement — — ( 4.0 ) — — — Foreign exchange rate changes — — 16.4 ( 45.9 ) — — Fair value of plan assets at end of year 145.5 140.2 324.9 306.4 — — Funded status (Fair value of plan assets less PBO) $ ( 17.1 ) $ ( 22.1 ) $ ( 142.5 ) $ ( 134.7 ) $ ( 3.3 ) $ ( 3.2 ) Amounts recognized in the Consolidated Balance Sheets consist of: Other non-current assets $ — $ — $ 2.5 $ 2.8 $ — $ — Other current liabilities — — 7.5 6.9 0.3 0.4 Pension and post-retirement benefit obligations 17.1 22.1 137.5 130.6 3.0 2.8 Components of accumulated other comprehensive income (loss), net of tax: Unrecognized actuarial loss (gain) 90.7 91.3 139.9 120.6 ( 3.6 ) ( 4.2 ) Unrecognized prior service cost — — 5.2 5.2 — —
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets	The following table sets out information for pension plans with an accumulated benefit obligation in excess of plan assets: U.S. International (in millions) 2023 2022 2023 2022 Accumulated benefit obligation $ 162.6 $ 162.3 $ 437.4 $ 406.1 Fair value of plan assets 145.5 140.2 297.2 273.7
Schedule of Defined Benefit Plan, Plan with Projected Benefit Obligations in Excess of Plan Assets	The following table sets out information for pension plans with a projected benefit obligation in excess of plan assets: U.S. International (in millions) 2023 2022 2023 2022 Projected benefit obligation $ 162.6 $ 162.3 $ 442.1 $ 411.3 Fair value of plan assets 145.5 140.2 297.2 273.7
Components of Net Periodic Benefit (Income) Expense for Pension and Post-Retirement Plans	The components of net periodic benefit (income) cost for pension and post-retirement plans for the years ended December 31, 2023, 2022, and 2021, were as follows: Year Ended December 31, Pension Post-retirement U.S. International (in millions) 2023 2022 2021 2023 2022 2021 2023 2022 2021 Service cost $ — $ — $ 0.5 $ 0.5 $ 1.0 $ 1.5 $ — $ — $ — Interest cost 7.9 4.9 4.5 20.0 9.6 6.3 0.2 0.1 0.1 Expected return on plan assets ( 12.0 ) ( 10.9 ) ( 11.4 ) ( 21.5 ) ( 17.5 ) ( 19.3 ) — — — Amortization of net loss (gain) 2.2 3.7 3.6 4.2 5.0 7.1 ( 0.5 ) ( 0.5 ) ( 0.5 ) Amortization of prior service cost — — 0.1 0.3 0.3 0.3 — — — Special termination benefit (1) — — — — 0.8 — — — — Curtailment loss (2) — — 1.4 — — — — — — Settlement loss — — — 1.2 — — — — — Net periodic benefit (income) cost (3) $ ( 1.9 ) $ ( 2.3 ) $ ( 1.3 ) $ 4.7 $ ( 0.8 ) $ ( 4.1 ) $ ( 0.3 ) $ ( 0.4 ) $ ( 0.4 ) (1) Special termination benefit of $ 0.8 million due to the plan wind-up of the ACCO Brands Canada Salaried and Hourly plans effective July 1, 2022. The plan wind-up is considered an irrevocable event that triggers special accounting, specifically a one-time special termination benefit. The plan wind-up is expected to be completed in 2024. (2) Curtailment loss of $ 1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan. (3) The components of net periodic benefit (income) cost, other than service cost, are included in the line "Non-operating pension expense (income)" in the Consolidated Statements of Income (Loss).
Schedule of Defined Benefit Plan Amounts Recognized in Accumulated Other Comprehensive Income (Loss)	Other changes in plan assets and benefit obligations that were recognized in accumulated other comprehensive income (loss) during the years ended December 31, 2023, 2022, and 2021 were as follows: Pension Post-retirement U.S. International (in millions) 2023 2022 2021 2023 2022 2021 2023 2022 2021 Current year actuarial loss (gain) $ 1.6 $ ( 1.0 ) $ ( 10.3 ) $ 17.2 $ ( 23.9 ) $ ( 30.5 ) $ 0.1 $ ( 0.6 ) $ ( 0.5 ) Amortization of actuarial (loss) gain ( 2.2 ) ( 3.7 ) ( 3.6 ) ( 5.2 ) ( 5.1 ) ( 7.1 ) 0.5 0.5 0.5 Amortization of prior service cost — — ( 1.5 ) ( 0.3 ) ( 0.3 ) ( 0.3 ) — — — Foreign exchange rate changes — — — 7.5 ( 21.5 ) ( 4.1 ) ( 0.1 ) 0.2 — Total recognized in other comprehensive (loss) income ( 0.6 ) ( 4.7 ) ( 15.4 ) 19.2 ( 50.8 ) ( 42.0 ) 0.5 0.1 — Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income $ ( 2.5 ) $ ( 7.0 ) $ ( 16.7 ) $ 23.9 $ ( 51.6 ) $ ( 46.1 ) $ 0.2 $ ( 0.3 ) $ ( 0.4 )
Schedule of Assumptions Used	The weighted average assumptions used to determine benefit obligations for the years ended December 31, 2023, 2022, and 2021 were as follows: Pension Post-retirement U.S. International 2023 2022 2021 2023 2022 2021 2023 2022 2021 Discount rate 5.0 % 5.1 % 2.9 % 4.2 % 4.5 % 1.8 % 4.8 % 3.8 % 2.4 % Rate of compensation increase N/A N/A N/A 2.9 % 3.0 % 3.0 % N/A N/A N/A The weighted average assumptions used to determine net periodic benefit (income) cost for the years ended December 31, 2023, 2022, and 2021 were as follows: Pension Post-retirement U.S. International 2023 2022 2021 2023 2022 2021 2023 2022 2021 Discount rate 5.1 % 2.9 % 3.1 % 4.5 % 1.8 % 1.0 % 5.0 % 2.4 % 2.2 % Expected long-term rate of return 7.5 % 6.5 % 6.8 % 6.9 % 4.0 % 4.0 % N/A N/A N/A Rate of compensation increase N/A N/A N/A 3.0 % 3.0 % 2.7 % N/A N/A N/A The weighted average health care cost trend rates used to determine post-retirement benefit obligations and net periodic benefit (income) cost as of December 31, 2023, 2022, and 2021were as follows: Post-retirement 2023 2022 2021 Health care cost trend rate assumed for next year 9 % 6 % 6 % Rate that the cost trend rate is assumed to decline (the ultimate trend rate) 7 % 5 % 5 % Year that the rate reaches the ultimate trend rate 2031 2030 2030
Schedule of Allocation of Plan Assets	Our pension plan weighted average asset allocations as of December 31, 2023 and 2022 were as follows: 2023 2022 U.S. International U.S. International Asset category Equity securities 37 % 7 % 35 % 9 % Fixed income 57 % 63 % 58 % 56 % Real estate 4 % 3 % 4 % 3 % Other (4) 2 % 27 % 3 % 32 % Total 100 % 100 % 100 % 100 % (4) Multi-strategy hedge funds, commodity linked funds, private equity funds, and cash and cash equivalents for certain of our plans.
Schedule of Expected Benefit Payments	The following table presents estimated future benefit payments to participants for the next ten fiscal years: (in millions) Pension Benefits Post-retirement Benefits 2024 $ 40.1 $ 0.3 2025 40.5 0.3 2026 40.5 0.3 2027 40.8 0.3 2028 41.7 0.3 Years 2029 - 2033 215.1 1.3
Schedule of Multi-employer Plans	Details regarding the plan are outlined in the table below. EIN/Pension Plan Pension Protection Act Zone Status FIP/RP Status Pending Contributions Year Ended December 31, Surcharge Expiration Date of Collective-Bargaining Pension Fund Number 2023 2022 Implemented 2023 2022 2021 Imposed Agreement PACE Industry Union-Management Pension Fund 11-6166763 / 001 Red Red Implemented $ 0.1 $ 0.1 $ 0.1 Yes 6/30/2028
U.S.
Defined Benefit Plan Disclosure [Line Items]
Schedule of Allocation of Plan Assets	U.S. Pension Plan Assets The fair value measurements of our U.S. pension plan assets by asset category as of December 31, 2023 were as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Fair Value as of (in millions) (Level 1) (Level 2) (Level 3) December 31, 2023 Mutual funds $ 106.1 $ — $ — $ 106.1 Exchange traded funds 38.3 — — 38.3 Common collective trust funds — 1.1 — 1.1 Total $ 144.4 $ 1.1 $ — $ 145.5 The fair value measurements of our U.S. pension plan assets by asset category as of December 31, 2022 were as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Fair Value as of (in millions) (Level 1) (Level 2) (Level 3) December 31, 2022 Mutual funds $ 105.3 $ — $ — $ 105.3 Exchange traded funds 33.8 — — 33.8 Common collective trust funds — 1.1 — 1.1 Total $ 139.1 $ 1.1 $ — $ 140.2
International
Defined Benefit Plan Disclosure [Line Items]
Schedule of Allocation of Plan Assets	International Pension Plans Assets The fair value measurements of our international pension plans assets by asset category as of December 31, 2023 were as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Fair Value as of (in millions) (Level 1) (Level 2) (Level 3) December 31, 2023 Cash and cash equivalents $ 6.4 $ — $ — $ 6.4 Equity securities 20.4 2.7 — 23.1 Corporate debt securities — 73.6 — 73.6 Multi-strategy hedge funds — 30.2 — 30.2 Insurance contracts — 4.1 — 4.1 Real estate — 3.7 — 3.7 Government debt securities — 131.3 — 131.3 Investments measured at net asset value (5) Multi-strategy hedge funds 24.7 Real estate 5.9 Private equity 21.9 Total $ 26.8 $ 245.6 $ — $ 324.9 (5) Certain investments that are measured at fair value using the net asset value per share practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in these tables are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the table that presents our defined benefit pension and post-retirement plans funded status. The fair value measurements of our international pension plans assets by asset category as of December 31, 2022 were as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Fair Value as of (in millions) (Level 1) (Level 2) (Level 3) December 31, 2022 Cash and cash equivalents $ 16.6 $ — $ — $ 16.6 Equity securities 25.2 — — 25.2 Corporate debt securities — 61.0 — 61.0 Multi-strategy hedge funds — 32.1 — 32.1 Insurance contracts — 3.8 — 3.8 Real estate — 2.2 — 2.2 Government debt securities — 109.1 — 109.1 Investments measured at net asset value (5) Multi-strategy hedge funds 30.2 Real estate 6.0 Private equity 20.2 Total $ 41.8 $ 208.2 $ — $ 306.4

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	The following table summarizes the impact of all stock-based compensation expense on our Consolidated Statements of (Loss) Income for the years ended December 31, 2023, 2022, and 2021: (in millions) 2023 2022 2021 Selling, general and administrative expense $ 14.8 $ 9.5 $ 15.2 Income (loss) before income tax ( 14.8 ) ( 9.5 ) ( 15.2 ) Income tax benefit ( 3.4 ) ( 2.2 ) ( 3.6 ) Net income (loss) $ ( 11.4 ) $ ( 7.3 ) $ ( 11.6 )
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	Stock-based compensation expense by award type for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 Stock option compensation expense $ 2.7 $ 3.7 $ 3.6 RSU compensation expense 6.4 4.4 5.3 PSU compensation expense 5.7 1.4 6.3 Total stock-based compensation expense $ 14.8 $ 9.5 $ 15.2
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model and the weighted average assumptions as outlined in the following table: Year Ended December 31, 2022 2021 Weighted average expected lives 6.0 years 6.0 years Weighted average risk-free interest rate 1.89 % 0.93 % Weighted average expected volatility 41.7 % 41.3 % Expected dividend yield 3.60 % 3.07 % Weighted average grant date fair value $ 2.43 $ 2.45
Summary of Changes in Stock Options Outstanding	A summary of the changes in stock options outstanding under the Plan during the year ended December 31, 2023 is presented below: Number Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Outstanding at December 31, 2022 6,728,615 $ 9.27 Forfeited ( 103,389 ) $ 9.70 Outstanding at December 31, 2023 6,625,226 $ 9.26 5.3 years zero Exercisable shares at December 31, 2023 5,015,909 $ 9.55 4.4 years zero
Summary of Changes in RSUs Outstanding	A summary of the changes in the RSUs outstanding under the Plan during 2023 is presented below: Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2022 2,016,120 $ 8.43 Granted 1,969,191 $ 5.23 Vested and distributed ( 536,132 ) $ 8.26 Forfeited and cancelled ( 4,729 ) $ 8.46 Outstanding at December 31, 2023 3,444,450 $ 6.63 Vested and deferred at December 31, 2023 (1) 673,883 $ 8.65 (1) Included in outstanding at December 31, 2023 . Vested and deferred RSUs are primarily related to deferred compensation for non-employee directors.
Summary of Changes in PSUs Outstanding	A summary of the changes in the PSUs outstanding under the Plan during 2023 is presented below: Stock Weighted Average Grant Date Fair Value Outstanding at December 31, 2022 673,169 $ 8.42 Granted 2,301,907 $ 5.39 Vested ( 336,077 ) $ 8.42 Other - decrease due to performance of PSUs ( 867,309 ) $ 4.34 Outstanding at December 31, 2023 1,771,690 $ 6.48

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
Components of Inventories	The components of inventories were as follows: December 31, (in millions) 2023 2022 Raw materials $ 50.1 $ 76.8 Work in process 4.7 4.4 Finished goods 272.7 314.0 Total inventories $ 327.5 $ 395.2

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	The following table shows estimated useful lives of property, plant and equipment: Property, plant and equipment Useful Life Buildings 40 to 50 years Leasehold improvements Lesser of lease term or the life of the asset Machinery, equipment and furniture 3 to 10 years Computer software 5 to 10 years The components of net property, plant and equipment were as follows: December 31 (in millions) 2023 2022 Land and improvements $ 20.9 $ 20.6 Buildings and improvements to leaseholds 130.7 125.3 Machinery and equipment 442.9 439.5 Construction in progress 5.1 3.8 599.6 589.2 Less: accumulated depreciation ( 429.5 ) ( 404.1 ) Net property, plant and equipment (1) $ 170.1 $ 185.1 (1) Net property, plant and equipment as of December 31, 2023 and 2022 contained $ 37.9 million and $ 52.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $ 14.1 million , $ 13.9 million and $ 12.9 million for the years ended December 31, 2023, 2022, and 2021 , respectively.

Goodwill and Identifiable Int_2

Goodwill and Identifiable Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Net Carrying Amount of Goodwill by Segment	Changes in the net carrying amount of goodwill by segment were as follows: (in millions) ACCO Brands North America ACCO Brands EMEA ACCO Brands International Total Balance at December 31, 2021 $ 446.7 $ 178.6 $ 177.2 $ 802.5 Goodwill impairment ( 98.7 ) — — ( 98.7 ) Foreign currency translation — ( 33.0 ) 0.7 ( 32.3 ) Balance at December 31, 2022 $ 348.0 $ 145.6 $ 177.9 $ 671.5 Goodwill impairment ( 89.5 ) — — ( 89.5 ) Foreign currency translation — 6.7 1.3 8.0 Balance at December 31, 2023 $ 258.5 $ 152.3 $ 179.2 $ 590.0
Gross Carrying Value and Accumulated Amortization by Class of Identifiable Intangible Assets	The Company's gross carrying value and accumulated amortization by class of identifiable intangible assets as of December 31, 2023 and 2022 were as follows: December 31, 2023 December 31, 2022 (in millions) Gross Carrying Amounts Accumulated Amortization Net Book Value Gross Carrying Amounts Accumulated Amortization Net Book Value Indefinite-lived intangible assets: Trade names (1) $ 295.1 $ ( 44.5 ) $ 250.6 $ 410.6 $ ( 44.5 ) $ 366.1 Amortizable intangible assets: Trade names 497.1 ( 142.0 ) 355.1 369.7 ( 123.0 ) 246.7 Customer and contractual relationships 362.4 ( 221.3 ) 141.1 356.9 ( 198.2 ) 158.7 Vendor relationships 82.4 ( 16.7 ) 65.7 82.4 ( 11.2 ) 71.2 Patents 8.2 ( 5.0 ) 3.2 8.1 ( 3.8 ) 4.3 Subtotal 950.1 ( 385.0 ) 565.1 817.1 ( 336.2 ) 480.9 Total identifiable intangibles $ 1,245.2 $ ( 429.5 ) $ 815.7 $ 1,227.7 $ ( 380.7 ) $ 847.0 (1) Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased.
Estimated Amortization Expense for Future Periods	Estimated amortization expense for amortizable intangible assets for the next five years is as follows: (in millions) 2024 2025 2026 2027 2028 Estimated amortization expense (2) $ 42.1 $ 40.5 $ 38.4 $ 36.0 $ 33.8 (2) Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events.

Restructuring (Tables)

Restructuring (Tables)	12 Months Ended
	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Summary of Activity in Restructuring Accounts	The summary of the activity in the restructuring liability for the year ended December 31, 2023 was as follows: (in millions) Balance at December 31, 2022 Provision Cash Expenditures Non-cash Items/Currency Change Balance at December 31, 2023 Employee termination costs (1) $ 8.7 $ 26.1 $ ( 7.6 ) $ 0.3 $ 27.5 Other (2) — 1.1 ( 0.2 ) — 0.9 Total restructuring liability $ 8.7 $ 27.2 $ ( 7.8 ) $ 0.3 $ 28.4 (1) We expect the remaining $ 27.5 million of employee termination costs to be substantially paid within the next twelve months . (2) We expect the remaining $ 0.9 million in other costs to be substantially paid within the next twelve months . The summary of the activity in the restructuring accounts for the year ended December 31, 2022 was as follows: (in millions) Balance at December 31, 2021 Provision Cash Expenditures Non-cash Items/Currency Change Balance at December 31, 2022 Employee termination costs $ 3.4 $ 9.4 $ ( 4.0 ) $ ( 0.1 ) $ 8.7 Termination of lease agreements 1.1 ( 0.2 ) ( 0.9 ) — — Other — 0.4 ( 0.4 ) — — Total restructuring liability $ 4.5 $ 9.6 $ ( 5.3 ) $ ( 0.1 ) $ 8.7 The summary of the activity in the restructuring accounts for the year ended December 31, 2021 was as follows: (in millions) Balance at December 31, 2020 Provision Cash Expenditures Non-cash Items/Currency Change Balance at December 31, 2021 Employee termination costs $ 8.1 $ 5.2 $ ( 9.7 ) $ ( 0.2 ) $ 3.4 Termination of lease agreements 1.0 0.7 ( 1.1 ) 0.5 1.1 Other 0.2 0.1 ( 0.2 ) ( 0.1 ) — Total restructuring liability $ 9.3 $ 6.0 $ ( 11.0 ) $ 0.2 $ 4.5 Restructuring charges for the years ended December 31, 2023, 2022, and 2021 by reporting segment were as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ 16.7 $ 5.3 $ 4.4 ACCO Brands EMEA 8.9 3.4 0.5 ACCO Brands International 1.0 0.7 1.1 Corporate 0.6 0.2 — Total restructuring charges $ 27.2 $ 9.6 $ 6.0

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of (Loss) Income before Income Tax, Domestic and Foreign	The components of (loss) income before income tax for the years ended December 31, 2023, 2022, and 2021 were as follows: (in millions) 2023 2022 2021 Domestic operations $ ( 124.8 ) $ ( 80.1 ) $ ( 5.6 ) Foreign operations 111.7 95.0 117.0 Total $ ( 13.1 ) $ 14.9 $ 111.4
Schedule of Effective Income Tax Rate Reconciliation	The reconciliation of income taxes computed at the U.S. federal statutory income tax rate of 21 percent to our effective income tax rate for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 Income tax at U.S. statutory rate; 21 % $ ( 2.7 ) $ 3.1 $ 23.4 Unrecognized tax expense (benefits) 1.0 ( 7.6 ) ( 1.9 ) Impact of final GILTI regulations for 2018 and 2019 — — ( 1.0 ) Statutory tax rate changes 0.4 0.6 ( 6.8 ) Statutory tax law changes ( 3.6 ) — ( 1.2 ) State, local and other tax, net of federal benefit ( 1.3 ) 1.6 0.6 Impact from foreign inclusions ( 0.7 ) 4.0 1.2 U.S. effect of foreign dividends and withholding taxes 3.9 1.8 1.2 Foreign income taxed at a higher effective rate 4.2 3.1 2.9 Brazilian Tax Assessments impact ( 13.3 ) 1.9 0.5 Increase (decrease) in valuation allowance 5.4 3.4 ( 11.4 ) General business credit ( 2.2 ) ( 1.9 ) ( 2.1 ) Excess expense from stock-based compensation 0.6 0.5 0.5 Impairment of non-deductible goodwill 18.8 20.7 — Impact of legal entity rationalization — ( 4.1 ) — Prior period tax return adjustment ( 1.0 ) ( 0.1 ) ( 0.6 ) Other (decrease) increase ( 0.8 ) 1.1 4.2 Income taxes as reported $ 8.7 $ 28.1 $ 9.5 Effective tax rate ( 66.4 )% 188.6 % 8.5 %
Schedule of Components of Income Tax Expense (Benefit)	The components of the income tax expense for the years ended December 31, 2023, 2022, and 2021 were as follows: (in millions) 2023 2022 2021 Current expense Federal and other $ 0.2 $ 1.8 $ 2.0 Foreign 28.6 25.0 28.5 Total current income tax expense 28.8 26.8 30.5 Deferred expense (benefit) Federal and other $ ( 16.7 ) $ 6.8 $ ( 16.5 ) Foreign ( 3.4 ) ( 5.5 ) ( 4.5 ) Total deferred income tax (benefit) expense ( 20.1 ) 1.3 ( 21.0 ) Total income tax expense $ 8.7 $ 28.1 $ 9.5
Schedule of Deferred Tax Assets and Liabilities	The components of deferred tax assets (liabilities) as of December 31, 2023 and 2022 were as follows: (in millions) 2023 2022 Deferred tax assets Compensation and benefits $ 23.0 $ 15.5 Pension 23.4 23.2 Inventory 10.4 10.1 Other reserves 18.9 21.7 Accounts receivable 7.4 9.7 Foreign tax credit carryforwards 6.4 11.1 Net operating loss carryforwards 76.7 89.2 Interest expense carryforwards 26.3 17.0 Section 174 capitalization 17.3 7.3 General business tax credit carryforwards 3.4 — Other 5.2 0.6 Gross deferred income tax assets 218.4 205.4 Valuation allowance ( 59.2 ) ( 51.9 ) Net deferred tax assets 159.2 153.5 Deferred tax liabilities Depreciation ( 5.7 ) ( 8.9 ) Unremitted non-U.S. earnings accrual ( 4.0 ) ( 5.5 ) Identifiable intangibles ( 170.4 ) ( 182.9 ) Other — ( 0.6 ) Gross deferred tax liabilities ( 180.1 ) ( 197.9 ) Net deferred tax liabilities $ ( 20.9 ) $ ( 44.4 )
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 Balance at beginning of year $ 39.1 $ 43.3 $ 45.1 Additions for tax positions of prior years 3.6 2.5 4.5 Reductions for tax positions of prior years ( 17.7 ) ( 8.3 ) ( 4.2 ) Increase (decrease) resulting from foreign currency translation 3.0 1.6 ( 2.1 ) Balance at end of year $ 28.0 $ 39.1 $ 43.3

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Summary of Weighted-Average Number of Shares Outstanding	Our weighted-average shares outstanding for the years ended December 31, 2023, 2022, and 2021 were as follows: Year Ended December 31, (in millions) 2023 2022 2021 Weighted-average number of shares of common stock outstanding - basic 95.3 95.3 95.5 Effect of dilutive securities: Stock options — — 0.1 Restricted stock units — — 1.5 Weighted-average shares and assumed conversions - diluted (1) 95.3 95.3 97.1 (1) Due to the net loss during the twelve months ended December 31, 2023 and 2022, the denominator in the diluted earnings per share calculation does not include the effects of the stock awards for which the average market price for the period exceeds the exercised price, as it would result in a less dilutive computation. As a result, diluted earnings per share for the twelve months ended December 31, 2023 and 2022 are the same as basic earnings per share.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table summarizes the fair value of our derivative financial instruments as of December 31, 2023 and 2022: Fair Value of Derivative Instruments Derivative Assets Derivative Liabilities (in millions) Balance Sheet Location December 31, December 31, Balance Sheet Location December 31, December 31, Derivatives designated as hedging instruments: Foreign exchange contracts Other current assets $ 0.3 $ 3.6 Other current liabilities $ 1.6 $ 1.9 Derivatives not designated as hedging instruments: Foreign exchange contracts Other current assets 1.0 0.7 Other current liabilities 0.1 0.7 Foreign exchange contracts Other non-current assets 3.2 4.9 Other non-current liabilities 3.2 4.9 Total derivatives $ 4.5 $ 9.2 $ 4.9 $ 7.5
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	The following tables summarize the pre-tax effect of the Company’s derivative financial instruments on the Consolidated Statements of Income for the years ended December 31, 2023, 2022, and 2021: The Effect of Derivative Instruments in Cash Flow Hedging Relationships on the Consolidated Financial Statements Amount of Gain (Loss) Recognized in AOCI (Effective Portion) Location of (Gain) Loss Reclassified from AOCI to Income Amount of (Gain) Loss Reclassified from AOCI to Income (Effective Portion) (in millions) 2023 2022 2021 2023 2022 2021 Cash flow hedges: Foreign exchange contracts $ 0.4 $ 9.8 $ 9.1 Cost of products sold $ ( 2.8 ) $ ( 14.0 ) $ 1.0 The Effect of Derivatives Not Designated as Hedging Instruments on the Consolidated Statements of (Loss) Income Location of (Gain) Loss Recognized in Income on Derivatives Amount of (Gain) Loss Recognized in Income (in millions) 2023 2022 2021 Foreign exchange contracts Other expense (income), net $ 0.1 $ ( 3.7 ) $ —

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table sets forth our financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2023 and 2022: (in millions) December 31, December 31, Assets: Forward currency contracts $ 4.5 $ 9.2 Liabilities: Forward currency contracts $ 4.9 $ 7.5

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of, and changes in, AOCI were as follows: (in millions) Derivative Financial Instruments Foreign Currency Adjustments Unrecognized Pension and Other Post-retirement Benefit Costs Accumulated Other Comprehensive Income (Loss) Balance at December 31, 2021 $ 4.0 $ ( 342.2 ) $ ( 197.3 ) $ ( 535.5 ) Other comprehensive income (loss) before reclassifications, net of tax 7.0 ( 37.9 ) 29.1 ( 1.8 ) Amounts reclassified from accumulated other comprehensive income (loss), net of tax ( 9.9 ) — 6.9 ( 3.0 ) Balance at December 31, 2022 $ 1.1 $ ( 380.1 ) $ ( 161.3 ) $ ( 540.3 ) Other comprehensive income (loss) before reclassifications, net of tax 0.2 30.3 ( 20.0 ) 10.5 Amounts reclassified from accumulated other comprehensive income (loss), net of tax ( 2.0 ) — 5.5 3.5 Balance at December 31, 2023 $ ( 0.7 ) $ ( 349.8 ) $ ( 175.8 ) $ ( 526.3 )
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)	The reclassifications out of AOCI for the years ended December 31, 2023, 2022, and 2021 were as follows: Year ended December 31, (in millions) 2023 2022 2021 Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Location on Income Statement Gain (loss) on cash flow hedges: Foreign exchange contracts $ 2.8 $ 14.0 $ ( 1.0 ) Cost of products sold Tax (expense) benefit ( 0.8 ) ( 4.1 ) 0.2 Income tax expense Net of tax $ 2.0 $ 9.9 $ ( 0.8 ) Defined benefit plan items: Amortization of actuarial loss (1) $ ( 5.9 ) $ ( 8.2 ) $ ( 10.2 ) Amortization of prior service cost (1) ( 0.3 ) ( 0.3 ) ( 1.8 ) Total before tax ( 6.2 ) ( 8.5 ) ( 12.0 ) Tax benefit 0.7 1.6 2.9 Income tax expense Net of tax $ ( 5.5 ) $ ( 6.9 ) $ ( 9.1 ) Total reclassifications for the period, net of tax $ ( 3.5 ) $ 3.0 $ ( 9.9 ) (1) These AOCI components are included in the computation of net periodic benefit (income) cost for pension and post-retirement plans (See "Note 5 . Pension and Other Retiree Benefits" for additional details).

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables present our net sales disaggregated by regional geography (1) , based upon our reporting business segments for the years ended December 31, 2023, 2022, and 2021, and our net sales disaggregated by the timing of revenue recognition for the years ended December 31, 2023, 2022, and 2021: (in millions) 2023 2022 2021 United States $ 792.2 $ 889.2 $ 934.2 Canada 95.0 108.8 108.2 ACCO Brands North America 887.2 998.0 1,042.4 ACCO Brands EMEA (1) 547.2 580.3 662.9 Australia/N.Z. 118.5 125.6 140.3 Latin America 244.5 197.5 125.5 Asia-Pacific 35.4 46.2 54.2 ACCO Brands International 398.4 369.3 320.0 Net sales (2) $ 1,832.8 $ 1,947.6 $ 2,025.3 (1) ACCO Brands EMEA is comprised largely of Europe, but also includes export sales to the Middle East and Africa. (2) Net sales are attributed to geographic areas based on the location of the selling subsidiaries . (in millions) 2023 2022 2021 Product and services transferred at a point in time $ 1,794.1 $ 1,899.5 $ 1,975.9 Product and services transferred over time 38.7 48.1 49.4 Net sales $ 1,832.8 $ 1,947.6 $ 2,025.3

Information on Business Segme_2

Information on Business Segments (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of Net Sales by Business Segment	Net sales by reportable business segment for the years ended December 31, 2023, 2022, and 2021 were as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ 887.2 $ 998.0 $ 1,042.4 ACCO Brands EMEA 547.2 580.3 662.9 ACCO Brands International 398.4 369.3 320.0 Net sales $ 1,832.8 $ 1,947.6 $ 2,025.3
Schedule of Operating (Loss) Income by Business Segment	Operating (loss) income by reportable business segment for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ ( 5.9 ) $ ( 4.9 ) $ 121.9 ACCO Brands EMEA 38.7 21.7 61.7 ACCO Brands International 60.7 50.5 31.6 Segment operating (loss) income 93.5 67.3 215.2 Change in fair value of contingent consideration — 9.0 ( 19.0 ) Corporate (1) ( 48.8 ) ( 41.5 ) ( 45.2 ) Operating income (2) 44.7 34.8 151.0 Interest expense 58.6 45.6 46.3 Interest income ( 7.1 ) ( 8.3 ) ( 1.9 ) Non-operating pension expense (income) 1.8 ( 4.5 ) ( 7.9 ) Other expense (income), net 4.5 ( 12.9 ) 3.1 (Loss) income before income tax $ ( 13.1 ) $ 14.9 $ 111.4 (1) Corporate operating loss in 2021 includes transaction costs of $ 0.2 million primarily for legal and due diligence expenditures associated with acquisitions. (2) Operating income as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less SG&A expenses; iv) less amortization of intangibles; v) less restructuring charges; and vi) less change in the fair value of contingent consideration.
Reconciliation of Assets from Segment to Consolidated	The following table presents the measure of reportable business segment assets used by the Company’s chief operating decision maker as of December 31, 2023 and 2022: (in millions) 2023 2022 ACCO Brands North America (3) $ 401.4 $ 459.2 ACCO Brands EMEA (3) 217.1 236.0 ACCO Brands International (3) 338.5 308.4 Total segment assets 957.0 1,003.6 Unallocated assets 1,684.2 1,787.2 Corporate (3) 3.6 3.9 Total assets $ 2,644.8 $ 2,794.7 (3) Represents total assets, excluding goodwill and identifiable intangibles resulting from business acquisitions, intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs and right of use asset, leases.
Schedule of Assets by Segment Including Allocation of Intangible Assets and Goodwill	As a supplement to the presentation of reportable business segment assets presented above, the table below presents reportable business segment assets, including right of use asset, leases, the allocation of identifiable intangible assets and goodwill resulting from business combinations as of December 31, 2023 and 2022: (in millions) 2023 2022 ACCO Brands North America (4) $ 1,190.7 $ 1,359.9 ACCO Brands EMEA (4) 568.7 588.4 ACCO Brands International (4) 603.4 573.8 Total segment assets 2,362.8 2,522.1 Unallocated assets 278.4 268.7 Corporate (4) 3.6 3.9 Total assets $ 2,644.8 $ 2,794.7 (4) Represents total assets, excluding intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs.
Schedule of Capital Spend and Depreciation Expense by Segment	Capital spend by reportable business segment for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ 4.0 $ 8.8 $ 11.2 ACCO Brands EMEA 6.8 4.7 7.3 ACCO Brands International 4.5 4.2 2.7 Total capital spend $ 15.3 $ 17.7 $ 21.2 Depreciation expense by reportable business segment for the years ended December 31, 2023, 2022, and 2021 was as follows: (in millions) 2023 2022 2021 ACCO Brands North America $ 16.8 $ 20.1 $ 20.7 ACCO Brands EMEA 10.9 12.6 13.1 ACCO Brands International 5.0 5.2 5.6 Total depreciation $ 32.7 $ 37.9 $ 39.4
Schedule of Property, Plant and Equipment, Net by Geographic Region	Property, plant and equipment, net by reportable business segment as of December 31, 2023, 2022 was as follows: (in millions) 2023 2022 U.S. $ 68.2 $ 82.3 Canada 1.5 1.7 ACCO Brands North America 69.7 84.0 ACCO Brands EMEA 60.9 62.9 Australia/N.Z. 9.5 10.0 Latin America 29.1 26.6 Asia-Pacific 0.9 1.6 ACCO Brands International 39.5 38.2 Property, plant and equipment, net $ 170.1 $ 185.1

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Payments Under Unconditional Purchase Commitments	Future minimum payments under unconditional purchase commitments, primarily for inventory purchase commitments as of December 31, 2023 were as follows: (in millions) 2024 $ 102.1 2025 6.9 2026 3.1 2027 0.2 2028 0.1 Thereafter 0.1 Total unconditional purchase commitments $ 112.5

Basis of Presentation - Narrati

Basis of Presentation - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Number of operating segments | Segment	3
Cost of acquisitions, net of cash acquired | $	$ 0	$ 0	$ (15.4)

Significant Accounting Polici_4

Significant Accounting Policies, Recent Accounting Pronouncements and Adopted Accounting Standards - Narrative (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) Reportingunit Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounting Policies [Line Items]
Number of operating segments | Segment			3
Interest costs capitalized			$ 0	$ 0
Impairment of intangible assets	$ 0
Percentage of excess fair value over carrying value			10%
Goodwill impairment		$ 0	$ 89,500,000	98,700,000	$ 0
Number of reporting units | Reportingunit			3
Deferred taxes for undistributed earnings of foreign subsidiaries			$ 4,000,000
Undistributed earnings of foreign subsidiaries not permanently reinvested			249,200,000
Undistributed earnings of foreign subsidiaries			272,700,000
Advertising expenses			102,700,000	108,800,000	117,400,000
Research and development expenses			$ 25,800,000	26,300,000	$ 26,600,000
Minimum
Accounting Policies [Line Items]
Service And Maintenance Agreement Term			3 months
Maximum
Accounting Policies [Line Items]
Percentage of excess fair value over carrying value			50%
Service And Maintenance Agreement Term			60 months
Amortizable Period, Option 1 | Minimum
Accounting Policies [Line Items]
Intangible assets, amortizable life			5 years
Amortizable Period, Option 2
Accounting Policies [Line Items]
Intangible assets, amortizable life			7 years
Amortizable Period, Option 3
Accounting Policies [Line Items]
Intangible assets, amortizable life			10 years
Amortizable Period, Option 4
Accounting Policies [Line Items]
Intangible assets, amortizable life			15 years
Amortizable Period, Option 5
Accounting Policies [Line Items]
Intangible assets, amortizable life			23 years
Amortizable Period, Option 6 | Maximum
Accounting Policies [Line Items]
Intangible assets, amortizable life			30 years
Buildings | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful life			40 years
Buildings | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful life			50 years
Machinery, equipment and furniture | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful life			3 years
Machinery, equipment and furniture | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful life			10 years
Computer software | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful life			5 years
Computer software | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful life			10 years
Leitz Indefinite-lived Trade Name
Accounting Policies [Line Items]
Intangible assets, amortizable life			30 years
ACCO Brands North America
Accounting Policies [Line Items]
Goodwill impairment			$ 89,500,000	98,700,000
ACCO Brands International
Accounting Policies [Line Items]
Goodwill impairment			0	0
ACCO Brands EMEA
Accounting Policies [Line Items]
Goodwill impairment			$ 0	$ 0

Acquisitions - Allocation of Co

Acquisitions - Allocation of Consideration Given to Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Less fair value of assets acquired:
Goodwill	$ 590	$ 671.5	$ 802.5

Long-term Debt and Short-term_3

Long-term Debt and Short-term Borrowings - Summary of Notes Payable and Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total debt	$ 925.6	$ 1,004.9
Current portion	36.7	60
Debt issuance costs, unamortized	6.7	8.4
Long-term debt, net	882.2	936.5
Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 5.93% at December 31, 2023 and 3.90% at December 31, 2022)
Debt Instrument [Line Items]
Total debt	218.2	227.4
USD Senior Secured Term Loan A, due March 2026 (floating interest rate of 7.50% at December 31, 2023 and 6.40% at December 31, 2022)
Debt Instrument [Line Items]
Total debt	78	84.4
Australian Dollar Senior Secured Term Loan A, due March 2026 (floating interest rate of 6.42% at December 31, 2023 and 5.30% at December 31, 2022)
Debt Instrument [Line Items]
Total debt	32.5	34.9
U.S. Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 7.40% at December 31, 2023 and 6.36% at December 31, 2022)
Debt Instrument [Line Items]
Total debt	7.3	58.6
Australian Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 6.42% at December 31, 2023 and 5.18% at December 31, 2022)
Debt Instrument [Line Items]
Total debt	14.3	14.2
Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25%)
Debt Instrument [Line Items]
Total debt	575	575
Other borrowings
Debt Instrument [Line Items]
Total debt	$ 0.3	$ 10.4

Long-term Debt and Short-term_4

Long-term Debt and Short-term Borrowings - Summary of Notes Payable and Long-Term Debt (Parenthetical) (Details)	Dec. 31, 2023	Dec. 31, 2022
Senior Secured Notes | Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 5.93% at December 31, 2023 and 3.90% at December 31, 2022)
Debt Instrument [Line Items]
Floating interest rate (percent)	5.93%	3.90%
Senior Secured Notes | USD Senior Secured Term Loan A, due March 2026 (floating interest rate of 7.50% at December 31, 2023 and 6.40% at December 31, 2022)
Debt Instrument [Line Items]
Floating interest rate (percent)	7.50%	6.40%
Senior Secured Notes | Australian Dollar Senior Secured Term Loan A, due March 2026 (floating interest rate of 6.42% at December 31, 2023 and 5.30% at December 31, 2022)
Debt Instrument [Line Items]
Floating interest rate (percent)	6.42%	5.30%
Senior Secured Notes | U.S. Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 7.40% at December 31, 2023 and 6.36% at December 31, 2022)
Debt Instrument [Line Items]
Floating interest rate (percent)	7.40%	6.36%
Senior Secured Notes | Australian Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 6.42% at December 31, 2023 and 5.18% at December 31, 2022)
Debt Instrument [Line Items]
Floating interest rate (percent)	6.42%	5.18%
Senior Notes | Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25%)
Debt Instrument [Line Items]
Stated interest rate (percent)	4.25%	4.25%

Long-term Debt and Short-term_5

Long-term Debt and Short-term Borrowings - Narrative (Details) € in Millions, $ in Millions, $ in Millions		1 Months Ended	12 Months Ended
	May 23, 2019	Jun. 30, 2025	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 22, 2019	Jan. 27, 2017 USD ($)	Jan. 27, 2017 EUR (€)	Jan. 27, 2017 AUD ($)
Debt Instrument [Line Items]
Total debt			$ 925.6	$ 1,004.9
Maximum consolidated leverage ratio			5
Debt issuance costs			$ 0	1.2	$ 10.5
Current portion of long-term debt			36.5	49.7
Long-term debt, net			882.2	936.5
Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25%)
Debt Instrument [Line Items]
Total debt			$ 575	$ 575
Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1%
Senior Secured Notes
Debt Instrument [Line Items]
Credit agreement, face amount							$ 320.8	€ 300
Maximum borrowing capacity							100
Senior Secured Notes | AUD Term Loan A
Debt Instrument [Line Items]
Maximum borrowing capacity							60.4		$ 80
Senior Secured Notes | Senior Secured Credit Facility Due March 2026
Debt Instrument [Line Items]
Interest Coverage Ratio				5.18
Maximum consolidated leverage ratio for payment of dividends or repurchase of shares				4.25
Leverage ratio				3.42
Dividends and/or purchase shares, threshold				$ 40
Dividends and/or purchase shares, threshold, percent of total assets				1%
Maximum borrowing capacity, potential increase				$ 500
Senior Secured Notes | Minimum | Senior Secured Credit Facility Due January 2022
Debt Instrument [Line Items]
Fixed coverage ratio						1.25
Senior Secured Notes | Minimum | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Interest Coverage Ratio	3
Senior Secured Notes | Minimum | Senior Secured Credit Facility Due March 2026
Debt Instrument [Line Items]
Interest Coverage Ratio				3
Quarterly principal payment, based on annual percentage	1.875%
Senior Secured Notes | Maximum | Senior Secured Credit Facility Due March 2026
Debt Instrument [Line Items]
Dividends and/or purchase shares, threshold				$ 75
Senior Secured Notes | Euro/AUD/CDN | ≤ 4.00 to 1.00 and > 3.50 to 1.00 | Senior Secured Credit Facility Due March 2026
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2%
Senior Secured Notes | Forecast | Maximum | Senior Secured Credit Facility Due March 2026
Debt Instrument [Line Items]
Quarterly principal payment, based on annual percentage		2.50%
Revolving Facility | Senior Secured Notes
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 600
Revolving Facility | Senior Secured Notes | Senior Secured Credit Facility Due March 2026
Debt Instrument [Line Items]
Total debt			$ 21.6
Amount available for borrowings under the Restated Revolver Facility			565.7
Letters of credit outstanding, amount			$ 12.7
Commitment fee percent			0.35%
Credit agreement, maturity date			Mar. 31, 2026
Current portion of long-term debt			$ 7.3
Long-term debt, net			$ 14.3
Revolving Facility | Senior Secured Notes | Minimum | Senior Secured Credit Facility Due March 2026
Debt Instrument [Line Items]
Commitment fee percent			0.20%
Revolving Facility | Senior Secured Notes | Maximum | Senior Secured Credit Facility Due March 2026
Debt Instrument [Line Items]
Commitment fee percent			0.50%

Long-term Debt and Short-term_6

Long-term Debt and Short-term Borrowings - Schedule of Maximum Consolidated Leverage Ratio (Details)	Dec. 31, 2023
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio	5
December 2022 | Senior Secured Credit Facility Due May 2024 | Secured Debt
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio	4.5
March 2023 | Senior Secured Credit Facility Due May 2024 | Secured Debt
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio	5
June 2023 | Senior Secured Credit Facility Due May 2024 | Secured Debt
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio	5
September 2023 | Senior Secured Credit Facility Due May 2024 | Secured Debt
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio	4.75
December 2023 | Senior Secured Credit Facility Due May 2024 | Secured Debt
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio	4.25

Long-term Debt and Short-term_7

Long-term Debt and Short-term Borrowings - Schedule of Applicable Rate and Undrawn Fee Based on Company's Consolidated Leverage Ratio (Details) - Secured Debt (Details)	12 Months Ended
	Dec. 31, 2023
Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1%
Secured Debt | Senior Secured Credit Facility Due March 2026 | > 4.50 to 1.00
Debt Instrument [Line Items]
Undrawn fee	0.50%
Secured Debt | Senior Secured Credit Facility Due March 2026 | > 4.50 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2.50%
Secured Debt | Senior Secured Credit Facility Due March 2026 | > 4.50 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.50%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 4.50 to 1.00 and > 4.00 to 1.00
Debt Instrument [Line Items]
Undrawn fee	0.375%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 4.50 to 1.00 and > 4.00 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2.25%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 4.50 to 1.00 and > 4.00 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.25%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 4.00 to 1.00 and > 3.50 to 1.00
Debt Instrument [Line Items]
Undrawn fee	0.35%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 4.00 to 1.00 and > 3.50 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 4.00 to 1.00 and > 3.50 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 3.50 to 1.00 and > 3.00 to 1.00
Debt Instrument [Line Items]
Undrawn fee	0.30%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 3.50 to 1.00 and > 3.00 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.75%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 3.50 to 1.00 and > 3.00 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.75%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 3.00 to 1.00 and > 2.00 to 1.00
Debt Instrument [Line Items]
Undrawn fee	0.25%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 3.00 to 1.00 and > 2.00 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.50%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 3.00 to 1.00 and > 2.00 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.50%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 2.00 to 1.00
Debt Instrument [Line Items]
Undrawn fee	0.20%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 2.00 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.25%
Secured Debt | Senior Secured Credit Facility Due March 2026 | ≤ 2.00 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.25%

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease cost	$ 28.6	$ 29.5	$ 29.7
Sublease income	(2.5)	(2.4)	(1.9)
Total lease cost	$ 26.1	$ 27.1	$ 27.8

Leases - Summary of Other Infor

Leases - Summary of Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating cash flows from operating leases	$ 29.8	$ 30.5
Right-of-use assets obtained in exchange for lease obligations, operating leases	$ 23.2	$ 11.4
Weighted average remaining lease term, operating leases (in years)	6 years
Weighted average discount rate, operating leases (as a percentage)	5.20%

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments, Net of Sub-Lease Income (Details) $ in Millions	Dec. 31, 2023 USD ($)
Operating Leases
2024	$ 26.6
2025	24.4
2026	19.8
2027	14.5
2028	12.3
Thereafter	25.5
Total minimum lease payments	123.1
Less imputed interest	25.8
Future minimum payments for leases, net of sublease rental income and imputed interest	$ 97.3

Pension and Other Retiree Ben_3

Pension and Other Retiree Benefits - Pension Benefit Obligation and Funded Status (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in plan assets
Employer contributions		$ 16.9
Amounts recognized in the Consolidated Balance Sheets consist of:
Pension and post-retirement benefit obligations		157.6	$ 155.5
Pension | U.S.
Change in projected benefit obligation (PBO)
Projected benefit obligation at beginning of year		162.3	212.5
Service cost		0	0	$ 0.5
Interest cost		7.9	4.9	4.5
Actuarial loss (gain)		3.2	(45.2)
Participants’ contributions		0	0
Benefits paid		(10.8)	(9.9)
Settlement		0	0
Termination benefits	[1]	0	0	0
Foreign exchange rate changes		0	0
Projected benefit obligation at end of year		162.6	162.3	212.5
Change in plan assets
Fair value of plan assets at beginning of year		140.2	180.9
Actual return on plan assets		13.6	(33.3)
Employer contributions		2.5	2.5
Participants’ contributions		0	0
Benefits paid		(10.8)	(9.9)
Settlement		0	0
Foreign exchange rate changes		0	0
Fair value of plan assets at end of year		145.5	140.2	180.9
Funded status (Fair value of plan assets less PBO)		(17.1)	(22.1)
Amounts recognized in the Consolidated Balance Sheets consist of:
Other non-current assets		0	0
Other current liabilities		0	0
Pension and post-retirement benefit obligations		17.1	22.1
Components of accumulated other comprehensive income (loss), net of tax:
Unrecognized actuarial loss (gain)		90.7	91.3
Unrecognized prior service cost		0	0
Pension | International
Change in projected benefit obligation (PBO)
Projected benefit obligation at beginning of year		441.1	673.6
Service cost		0.5	1	1.5
Interest cost		20	9.6	6.3
Actuarial loss (gain)		14.6	(158.7)
Participants’ contributions		0.1	0.1
Benefits paid		(27)	(25.7)
Settlement		(3.9)	0
Termination benefits	[1]	0	0.8	0
Foreign exchange rate changes		22	(59.6)
Projected benefit obligation at end of year		467.4	441.1	673.6
Change in plan assets
Fair value of plan assets at beginning of year		306.4	481.7
Actual return on plan assets		18.9	(117.2)
Employer contributions		14.1	13.4
Participants’ contributions		0.1	0.1
Benefits paid		(27)	(25.7)
Settlement		(4)	0
Foreign exchange rate changes		16.4	(45.9)
Fair value of plan assets at end of year		324.9	306.4	481.7
Funded status (Fair value of plan assets less PBO)		(142.5)	(134.7)
Amounts recognized in the Consolidated Balance Sheets consist of:
Other non-current assets		2.5	2.8
Other current liabilities		7.5	6.9
Pension and post-retirement benefit obligations		137.5	130.6
Components of accumulated other comprehensive income (loss), net of tax:
Unrecognized actuarial loss (gain)		139.9	120.6
Unrecognized prior service cost		5.2	5.2
Post-retirement
Change in projected benefit obligation (PBO)
Projected benefit obligation at beginning of year		3.2	4.3
Service cost		0	0	0
Interest cost		0.2	0.1	0.1
Actuarial loss (gain)		0.1	(0.6)
Participants’ contributions		0	0
Benefits paid		(0.3)	(0.4)
Settlement		0	0
Termination benefits	[1]	0	0	0
Foreign exchange rate changes		0.1	(0.2)
Projected benefit obligation at end of year		3.3	3.2	4.3
Change in plan assets
Fair value of plan assets at beginning of year		0	0
Actual return on plan assets		0	0
Employer contributions		0.3	0.4
Participants’ contributions		0	0
Benefits paid		(0.3)	(0.4)
Settlement		0	0
Foreign exchange rate changes		0	0
Fair value of plan assets at end of year		0	0	$ 0
Funded status (Fair value of plan assets less PBO)		(3.3)	(3.2)
Amounts recognized in the Consolidated Balance Sheets consist of:
Other non-current assets		0	0
Other current liabilities		0.3	0.4
Pension and post-retirement benefit obligations		3	2.8
Components of accumulated other comprehensive income (loss), net of tax:
Unrecognized actuarial loss (gain)		(3.6)	(4.2)
Unrecognized prior service cost		$ 0	$ 0
[1] Special termination benefit of $ 0.8 million due to the plan wind-up of the ACCO Brands Canada Salaried and Hourly plans effective July 1, 2022. The plan wind-up is considered an irrevocable event that triggers special accounting, specifically a one-time special termination benefit. The plan wind-up is expected to be completed in 2024.

Pension and Other Retiree Ben_4

Pension and Other Retiree Benefits (Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - Pension - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 162.6	$ 162.3
Fair value of plan assets	145.5	140.2
International
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	437.4	406.1
Fair value of plan assets	$ 297.2	$ 273.7

Pension and Other Retiree Ben_5

Pension and Other Retiree Benefits - Projected Benefit Obligations in Excess of Plan Assets (Details) - Pension - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
U.S.
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 162.6	$ 162.3
Fair value of plan assets	145.5	140.2
International
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	442.1	411.3
Fair value of plan assets	$ 297.2	$ 273.7

Pension and Other Retiree Ben_6

Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 0	$ 0	$ 0.5
Interest cost		7.9	4.9	4.5
Expected return on plan assets		(12)	(10.9)	(11.4)
Amortization of net loss (gain)		2.2	3.7	3.6
Amortization of prior service cost		0	0	0.1
Special termination benefit	[1]	0	0	0
Curtailment loss	[2]	0	0	1.4
Settlement loss		0	0	0
Net periodic benefit cost (income) cost	[3]	(1.9)	(2.3)	(1.3)
Pension | International
Defined Benefit Plan Disclosure [Line Items]
Service cost		0.5	1	1.5
Interest cost		20	9.6	6.3
Expected return on plan assets		(21.5)	(17.5)	(19.3)
Amortization of net loss (gain)		4.2	5	7.1
Amortization of prior service cost		0.3	0.3	0.3
Special termination benefit	[1]	0	0.8	0
Curtailment loss	[2]	0	0	0
Settlement loss		(1.2)	0	0
Net periodic benefit cost (income) cost	[3]	4.7	(0.8)	(4.1)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost		0	0	0
Interest cost		0.2	0.1	0.1
Expected return on plan assets			0	0
Amortization of net loss (gain)		(0.5)	(0.5)	(0.5)
Amortization of prior service cost		0	0	0
Special termination benefit	[1]	0	0	0
Curtailment loss	[2]	0	0	0
Settlement loss		0	0	0
Net periodic benefit cost (income) cost	[3]	$ (0.3)	$ (0.4)	$ (0.4)
[1] Special termination benefit of $ 0.8 million due to the plan wind-up of the ACCO Brands Canada Salaried and Hourly plans effective July 1, 2022. The plan wind-up is considered an irrevocable event that triggers special accounting, specifically a one-time special termination benefit. The plan wind-up is expected to be completed in 2024. Curtailment loss of $ 1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan. The components of net periodic benefit (income) cost, other than service cost, are included in the line "Non-operating pension expense (income)" in the Consolidated Statements of Income (Loss).

Pension and Other Retiree Ben_7

Pension and Other Retiree Benefits - Other Changes Recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension | U.S.
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss (gain)	$ (1.6)	$ 1	$ 10.3
Amortization of actuarial (loss) gain	(2.2)	(3.7)	(3.6)
Amortization of prior service cost			1.5
Foreign exchange rate changes
Total recognized in other comprehensive (loss) income	(0.6)	(4.7)	(15.4)
Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income	(2.5)	(7)	(16.7)
Pension | International
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss (gain)	(17.2)	23.9	30.5
Amortization of actuarial (loss) gain	(5.2)	(5.1)	(7.1)
Amortization of prior service cost	0.3	0.3	0.3
Foreign exchange rate changes	7.5	(21.5)	(4.1)
Total recognized in other comprehensive (loss) income	19.2	(50.8)	(42)
Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income	23.9	(51.6)	(46.1)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss (gain)	(0.1)	0.6	0.5
Amortization of actuarial (loss) gain	0.5	0.5	0.5
Amortization of prior service cost
Foreign exchange rate changes	(0.1)	0.2
Total recognized in other comprehensive (loss) income	0.5	0.1
Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income	$ 0.2	$ (0.3)	$ (0.4)

Pension and Other Retiree Ben_8

Pension and Other Retiree Benefits - Weighted Average Assumptions Used in Calculating Benefit Obligation (Details)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension | U.S.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5%	5.10%	2.90%
Pension | International
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	4.50%	1.80%
Rate of compensation increase	2.90%	3%	3%
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.80%	3.80%	2.40%

Pension and Other Retiree Ben_9

Pension and Other Retiree Benefits - Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension | U.S.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.10%	2.90%	3.10%
Expected long-term rate of return	7.50%	6.50%	6.80%
Pension | International
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.50%	1.80%	1%
Expected long-term rate of return	6.90%	4%	4%
Rate of compensation increase	3%	3%	2.70%
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5%	2.40%	2.20%

Pension and Other Retiree Be_10

Pension and Other Retiree Benefits - Assumed Health Care Cost Trend Rates (Details) - Post-retirement	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	9%	6%	6%
Rate that the cost trend rate is assumed to decline (the ultimate trend rate)	7%	5%	5%
Year that the rate reaches the ultimate trend rate	2031	2030	2030

Pension and Other Retiree Be_11

Pension and Other Retiree Benefits - Weighted Average Asset Allocation (Details) - Pension		Dec. 31, 2023	Dec. 31, 2022
U.S.
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations		100%	100%
U.S. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations		37%	35%
U.S. | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations		57%	58%
U.S. | Real estate
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations		4%	4%
U.S. | Other
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	[1]	2%	3%
International
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations		100%	100%
International | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations		7%	9%
International | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations		63%	56%
International | Real estate
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations		3%	3%
International | Other
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	[1]	27%	32%
[1] Multi-strategy hedge funds, commodity linked funds, private equity funds, and cash and cash equivalents for certain of our plans.

Pension and Other Retiree Be_12

Pension and Other Retiree Benefits - Fair Value of Plan Assets (Details) - Pension - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 145.5	$ 140.2	$ 180.9
U.S. | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	144.4	139.1
U.S. | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1.1	1.1
U.S. | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	145.5	140.2
U.S. | Mutual funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	106.1	105.3
U.S. | Mutual funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. | Mutual funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. | Mutual funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	106.1	105.3
U.S. | Exchange traded funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	38.3	33.8
U.S. | Exchange traded funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. | Exchange traded funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. | Exchange traded funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	38.3	33.8
U.S. | Common collective trust funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. | Common collective trust funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1.1	1.1
U.S. | Common collective trust funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. | Common collective trust funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1.1	1.1
International
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	324.9	306.4	$ 481.7
International | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	26.8	41.8
International | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	245.6	208.2
International | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	6.4	16.6
International | Cash and cash equivalents | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Cash and cash equivalents | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	6.4	16.6
International | Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	20.4	25.2
International | Equity securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2.7	0
International | Equity securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Equity securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	23.1	25.2
International | Corporate debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Corporate debt securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	73.6	61
International | Corporate debt securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Corporate debt securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	73.6	61
International | Multi-strategy hedge funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Multi-strategy hedge funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	30.2	32.1
International | Multi-strategy hedge funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Multi-strategy hedge funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	30.2	32.1
International | Multi-strategy hedge funds | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	24.7	30.2
International | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Insurance contracts | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	4.1	3.8
International | Insurance contracts | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Insurance contracts | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	4.1	3.8
International | Real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Real estate | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	3.7	2.2
International | Real estate | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Real estate | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	3.7	2.2
International | Government debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Government debt securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	131.3	109.1
International | Government debt securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International | Government debt securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	131.3	109.1
International | Real estate | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5.9	6
International | Private equity | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 21.9	$ 20.2

Pension and Other Retiree Be_13

Pension and Other Retiree Benefits - Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Pension
Defined Benefit Plan Disclosure [Line Items]
2024	$ 40.1
2025	40.5
2026	40.5
2027	40.8
2028	41.7
Years 2029 - 2033	215.1
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2024	0.3
2025	0.3
2026	0.3
2027	0.3
2028	0.3
Years 2029 - 2033	$ 1.3

Pension and Other Retiree Be_14

Pension and Other Retiree Benefits - Multi-Employer (Details) - Pension - PACE Industry Union-Management Pension Fund - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Multiemployer Plans [Line Items]
Minimum Period in Years for Withdrawal Liability	20 years
Multiemployer Plans, Period Contributions, Significance of Contributions [true false]	false
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List]	Red	Red
FIP/RP Status	Implemented
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost	$ 0.1	$ 0.1	$ 0.1
Surcharge Imposed	Yes
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date	Jun. 30, 2028

Pension and Other Retiree Be_15

Pension and Other Retiree Benefits - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Yr	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Pension and post-retirement benefit obligations	$ 157.6	$ 155.5
Employer contributions	16.9
Expected contributions to defined benefit plans for 2022	16
Costs related to defined contribution plans	12.5	13.2	$ 12.7
Pension settlement cost	0.7
Esselte Leitz Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Unfunded Pension Plan liability	$ 109.9	103
Minimum
Defined Benefit Plan Disclosure [Line Items]
Payment of retirement benefits, commencement age for participants | Yr	60
Maximum
Defined Benefit Plan Disclosure [Line Items]
Payment of retirement benefits, commencement age for participants | Yr	65
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 625.1	598.1
Pension Plan | U.S.
Defined Benefit Plan Disclosure [Line Items]
Pension and post-retirement benefit obligations	$ 17.1	$ 22.1
Weighted average asset allocations	100%	100%
Employer contributions	$ 2.5	$ 2.5
Pension Plan | U.S. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	37%	35%
Pension Plan | U.S. | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	57%	58%
Pension Plan | U.S. | Alternate assets
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	6%

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	15,994,631
Capitalization of stock based compensation expense	$ 0
Proceeds from stock options exercised	$ 0	$ 4,300,000	$ 3,100,000
Granted (in shares)	2,301,907
Vested and distributed (in shares)	(336,077)
Share-based compensation expense, shares that vests on grant date	$ 14,800,000	$ 9,500,000	15,200,000
Stock options granted	0
Shares outstanding (in shares)	1,771,690	673,169
Weighted average grant date fair value (in dollar per share)	$ 5.39
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period	7 years			10 years
Award vesting period	3 years
Proceeds from stock options exercised	$ 0	$ 4,300,000	3,100,000
Options exercised		500,000	1,000,000
Fair value of options vested during the period	3,400,000	3,100,000	2,700,000
Unrecognized compensation expense	$ 800,000
Weighted average years expense to be recognized over	1 year
Share-based compensation expense, shares that vests on grant date	$ 2,700,000	$ 3,700,000	$ 3,600,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Unrecognized compensation expense	$ 8,200,000
Weighted average years expense to be recognized over	2 years
Granted (in shares)	1,969,191	695,057	362,750
Vested and distributed (in shares)	(536,132)
Share-based compensation expense, shares that vests on grant date	$ 6,400,000	$ 4,400,000	$ 5,300,000
Shares outstanding (in shares)	3,444,450	2,016,120
Weighted average grant date fair value (in dollar per share)	$ 5.23	$ 8.15	$ 8.78
Fair value of stock awards vested	$ 4,400,000	$ 5,100,000	$ 4,200,000
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 5,000,000
Weighted average years expense to be recognized over	1 year 10 months 24 days
Granted (in shares)		1,170,884	1,667,012
Vested and distributed (in shares)	(336,077)	(350,656)	0
Share-based compensation expense, shares that vests on grant date	$ 5,700,000	$ 1,400,000	$ 6,300,000
Weighted average grant date fair value (in dollar per share)	$ 5.39	$ 8.88	$ 8.42
Fair value of stock awards vested	$ 2,800,000	$ 3,000,000	$ 0
Shares called upon vested (in shares)	1
Minimum | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage awarded	0%
Maximum | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Percentage awarded	200%
Fully Vested On The Grant Date | Restricted stock units | Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, shares that vests on grant date	$ 1,300,000	$ 1,200,000	$ 700,000

Stock-Based Compensation - Shar

Stock-Based Compensation - Share-Based Compensation Expense by Line Item (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ (14.8)	$ (9.5)	$ (15.2)
Income tax benefit	(3.4)	(2.2)	(3.6)
Net income (loss)	(11.4)	(7.3)	(11.6)
SG&A Expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 14.8	$ 9.5	$ 15.2

Stock-Based Compensation - Sh_2

Stock-Based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 14.8	$ 9.5	$ 15.2
Stock option compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2.7	3.7	3.6
RSU compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	6.4	4.4	5.3
PSU compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 5.7	$ 1.4	$ 6.3

Stock-Based Compensation - Weig

Stock-Based Compensation - Weighted Average Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average expected lives	6 years	6 years
Weighted average risk-free interest rate	1.89%	0.93%
Weighted average expected volatility	41.70%	41.30%
Expected dividend yield	3.60%	3.07%
Weighted average grant date fair value ( in dollars per share)	$ 2.43	$ 2.45

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Option Activity (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Number Outstanding [Roll Forward]
Granted (in shares)	0
Employee Stock Option
Number Outstanding [Roll Forward]
Outstanding at December 31, 2022 (in shares)	6,728,615
Forfeited (in shares)	(103,389)
Outstanding at December 31, 2023 (in shares)	6,625,226
Exercisable shares at December 31, 2023 (in shares)	5,015,909
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2022 (in dollar per share) | $ / shares	$ 9.27
Forfeited (in dollar per share) | $ / shares	9.7
Outstanding at December 31, 2023 (in dollar per share) | $ / shares	9.26
Exercisable shares at December 31, 2023, Weighted Average Exercise Price (in dollar per share) | $ / shares	$ 9.55
Outstanding at December 31, 2023, Weighted Average Remaining Contractual Term	5 years 3 months 18 days
Exercisable shares at December 31, 2023, Weighted Average Contractual Term	4 years 4 months 24 days
Outstanding at December 31, 2023, Aggregate Intrinsic Value | $	$ 0
Exercisable shares at December 31, 2023, Aggregate Intrinsic Value | $	$ 0

Stock-Based Compensation - St_2

Stock-Based Compensation - Stock Units Rollforward (Details) - $ / shares		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock Units [Roll Forward]
Outstanding at December 31, 2022 (in shares)		673,169
Granted (in shares)		2,301,907
Vested and distributed (in shares)		(336,077)
Other - decrease due to performance of PSUs (in shares)		(867,309)
Outstanding at December 31, 2023 (in shares)		1,771,690	673,169
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at December 31, 2022, Weighted Average Grant Date Fair Value (in dollar per share)		$ 8.42
Granted, Weighted Average Grant Date Fair Value (in dollar per share)		5.39
Vested and Distributed, Weighted Average Grant Date Fair Value (in dollar per share)		8.42
Other decrease due to performance of PSU's, Weighted Average Grant Date Fair Value (in dollar per share)		4.34
Outstanding at December 31, 2023, Weighted Average Grant Date Fair Value (in dollar per share)		$ 6.48	$ 8.42
RSUs
Stock Units [Roll Forward]
Outstanding at December 31, 2022 (in shares)		2,016,120
Granted (in shares)		1,969,191	695,057	362,750
Vested and distributed (in shares)		(536,132)
Forfeited (in shares)		(4,729)
Outstanding at December 31, 2023 (in shares)		3,444,450	2,016,120
Vested and deferred RSUs related to deferred compensation for non-employee directors (in shares)	[1]	673,883
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at December 31, 2022, Weighted Average Grant Date Fair Value (in dollar per share)		$ 8.43
Granted, Weighted Average Grant Date Fair Value (in dollar per share)		5.23	$ 8.15	$ 8.78
Vested and Distributed, Weighted Average Grant Date Fair Value (in dollar per share)		8.26
Forfeited, Weighted Average Grant Date Fair Value (in dollar per share)		8.46
Outstanding at December 31, 2023, Weighted Average Grant Date Fair Value (in dollar per share)		6.63	$ 8.43
Weighted Average Grant Date Fair Value of Vested and Deferred RSUs (in dollar per share)	[1]	$ 8.65
PSUs
Stock Units [Roll Forward]
Granted (in shares)			1,170,884	1,667,012
Vested and distributed (in shares)		(336,077)	(350,656)	0
Weighted Average Grant Date Fair Value [Roll Forward]
Granted, Weighted Average Grant Date Fair Value (in dollar per share)		$ 5.39	$ 8.88	$ 8.42
[1] Included in outstanding at December 31, 2023 . Vested and deferred RSUs are primarily related to deferred compensation for non-employee directors.

Inventories - Components of Inv

Inventories - Components of Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Raw materials	$ 50.1	$ 76.8
Work in process	4.7	4.4
Finished goods	272.7	314
Total inventories	$ 327.5	$ 395.2

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 599.6	$ 589.2
Less: accumulated depreciation		(429.5)	(404.1)
Property, plant and equipment, net	[1]	170.1	185.1
Computer software included in net property, plant and equipment		37.9	52.5
Amortization of software costs		14.1	13.9	$ 12.9
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment		20.9	20.6
Buildings and improvements to leaseholds
Property, Plant and Equipment [Line Items]
Property, plant and equipment		130.7	125.3
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment		442.9	439.5
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 5.1	$ 3.8
[1] Net property, plant and equipment as of December 31, 2023 and 2022 contained $ 37.9 million and $ 52.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $ 14.1 million , $ 13.9 million and $ 12.9 million for the years ended December 31, 2023, 2022, and 2021 , respectively.

Goodwill and Identifiable Int_3

Goodwill and Identifiable Intangible Assets - Narrative (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) Reportingunit	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 31, 2023 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | Reportingunit			3
Goodwill, accumulated impairment losses						$ 0
Goodwill impairment		$ 0	$ 89,500,000	$ 98,700,000	$ 0
Amortization of intangibles			$ 43,400,000	$ 41,500,000	$ 46,300,000
Impairment of indefinite-lived trade names	$ 0
Percentage of excess fair value over carrying value			10%
Maximum
Finite-Lived Intangible Assets [Line Items]
Percentage of excess fair value over carrying value			50%
Leitz Indefinite-lived Trade Name
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			30 years

Goodwill and Identifiable Int_4

Goodwill and Identifiable Intangible Assets - Summary of Changes in Net Carrying Amount Goodwill By Segment (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning balance	$ 671,500,000	$ 671,500,000	$ 802,500,000
Goodwill impairment	0	(89,500,000)	(98,700,000)	$ 0
Foreign currency translation		8,000,000	(32,300,000)
Ending balance		590,000,000	671,500,000	802,500,000
ACCO Brands North America
Goodwill [Roll Forward]
Beginning balance	348,000,000	348,000,000	446,700,000
Goodwill impairment		(89,500,000)	(98,700,000)
Foreign currency translation		0	0
Ending balance		258,500,000	348,000,000	446,700,000
ACCO Brands EMEA
Goodwill [Roll Forward]
Beginning balance	145,600,000	145,600,000	178,600,000
Goodwill impairment		0	0
Foreign currency translation		6,700,000	(33,000,000)
Ending balance		152,300,000	145,600,000	178,600,000
ACCO Brands International
Goodwill [Roll Forward]
Beginning balance	$ 177,900,000	177,900,000	177,200,000
Goodwill impairment		0	0
Foreign currency translation		1,300,000	700,000
Ending balance		$ 179,200,000	$ 177,900,000	$ 177,200,000

Goodwill and Identifiable Int_5

Goodwill and Identifiable Intangible Assets - Summary of Gross Carrying Value and Accumulated Amortization By Class of Identifiable Intangible Assets (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amounts		$ 950.1	$ 817.1
Amortizable intangible assets, Accumulated Amortization		(385)	(336.2)
Amortizable intangible assets, Net Book Value		565.1	480.9
Total identifiable intangibles
Total identifiable intangible assets, Gross Carrying Amounts		1,245.2	1,227.7
Total identifiable intangibles, Accumulated Amortization		(429.5)	(380.7)
Total identifiable intangibles, Net Book Value		815.7	847
Trade Names
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amounts		497.1	369.7
Amortizable intangible assets, Accumulated Amortization		(142)	(123)
Amortizable intangible assets, Net Book Value		355.1	246.7
Customer and contractual relationships
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amounts		362.4	356.9
Amortizable intangible assets, Accumulated Amortization		(221.3)	(198.2)
Amortizable intangible assets, Net Book Value		141.1	158.7
Vendor Relationships
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amounts		82.4	82.4
Amortizable intangible assets, Accumulated Amortization		(16.7)	(11.2)
Amortizable intangible assets, Net Book Value		65.7	71.2
Patents
Amortizable intangible assets:
Amortizable intangible assets, Gross Carrying Amounts		8.2	8.1
Amortizable intangible assets, Accumulated Amortization		(5)	(3.8)
Amortizable intangible assets, Net Book Value		3.2	4.3
Trade Names
Indefinite-lived intangible assets:
Indefinite-lived intangible assets, Gross Carrying Amount	[1]	295.1	410.6
Indefinite-lived intangible asset, Accumulated Amortization	[1]	(44.5)	(44.5)
Indefinite-lived intangible assets, Net Book Value	[1]	$ 250.6	$ 366.1
[1] Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased.

Goodwill and Identifiable Int_6

Goodwill and Identifiable Intangible Assets - Amortization Expense and Estimated Future Amortization (Details) $ in Millions	Dec. 31, 2023 USD ($)	[1]
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated amortization expense, 2024	$ 42.1
Estimated amortization expense, 2025	40.5
Estimated amortization expense, 2026	38.4
Estimated amortization expense, 2027	36
Estimated amortization expense, 2028	$ 33.8
[1] Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events.

Restructuring (Restructuring Ch

Restructuring (Restructuring Charges and Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 8.7		$ 4.5		$ 9.3
Provision	27.2		9.6		6
Cash expenditures	(7.8)		(5.3)		(11)
Non-cash Items/ Currency Change	0.3		(0.1)		0.2
Balance at end of period	28.4		8.7		4.5
Employee termination costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	8.7	[1]	3.4		8.1
Provision	26.1	[1]	9.4		5.2
Cash expenditures	(7.6)	[1]	(4)		(9.7)
Non-cash Items/ Currency Change	(0.3)	[1]	0.1		(0.2)
Balance at end of period	$ 27.5	[1]	8.7	[1]	3.4
Period over which restructuring and related costs are to be paid	12 months
Termination of lease agreements
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 0		1.1		1
Provision			(0.2)		0.7
Cash expenditures			(0.9)		(1.1)
Non-cash Items/ Currency Change			0		0.5
Balance at end of period			0		1.1
Other
Restructuring Reserve [Roll Forward]
Balance at beginning of period	0	[2]	0		0.2
Provision	1.1	[2]	0.4		0.1
Cash expenditures	(0.2)	[2]	(0.4)		(0.2)
Non-cash Items/ Currency Change	0	[2]	0		(0.1)
Balance at end of period	$ 0.9	[2]	0	[2]	0
Period over which restructuring and related costs are to be paid	12 months
ACCO Brands North America
Restructuring Reserve [Roll Forward]
Provision	$ 16.7		5.3		4.4
ACCO Brands EMEA
Restructuring Reserve [Roll Forward]
Provision	$ 8.9		$ 3.4		$ 0.5
[1] We expect the remaining $ 27.5 million of employee termination costs to be substantially paid within the next twelve months We expect the remaining $ 0.9 million in other costs to be substantially paid within the next twelve months .

Restructuring (Restructuring _2

Restructuring (Restructuring Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 27.2		$ 9.6	$ 6
ACCO Brands North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	16.7		5.3	4.4
ACCO Brands EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring charges	8.9		3.4	0.5
ACCO Brands International
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1		0.7	1.1
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.6		0.2	0
Employee termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	26.1	[1]	9.4	5.2
Termination of lease agreements
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(0.2)	0.7
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.1	[2]	$ 0.4	$ 0.1
[1] We expect the remaining $ 27.5 million of employee termination costs to be substantially paid within the next twelve months We expect the remaining $ 0.9 million in other costs to be substantially paid within the next twelve months .

Income Taxes - Components of (L

Income Taxes - Components of (Loss) Income Before Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Domestic operations	$ (124.8)	$ (80.1)	$ (5.6)
Foreign operations	111.7	95	117
Income before income tax	$ (13.1)	$ 14.9	$ 111.4

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax at U.S. statutory rate; 21%	$ (2.7)	$ 3.1	$ 23.4
Unrecognized tax expense (benefits)	1	(7.6)	(1.9)
Impact on final GILTI regulations for 2018 and 2019	0	0	(1)
Statutory tax rate changes	0.4	0.6	(6.8)
Statutory tax law changes	(3.6)	0	(1.2)
State, local and other tax, net of federal benefit	(1.3)	1.6	0.6
Impact from foreign inclusions	(0.7)	4	1.2
U.S. effect of foreign dividends and withholding taxes	3.9	1.8	1.2
Foreign income taxed at a higher effective rate	4.2	3.1	2.9
Brazilian Tax Assessments impact	(13.3)	1.9	0.5
Increase (decrease) in valuation allowance	5.4	3.4	(11.4)
General business credit	(2.2)	(1.9)	(2.1)
Excess expense from stock-based compensation	0.6	0.5	0.5
Impairment of non-deductible goodwill	18.8	20.7	0
Impact of legal entity rationalization	0	(4.1)	0
Prior period tax return adjustment	(1)	(0.1)	(0.6)
Other (decrease) increase	(0.8)	1.1	4.2
Total income tax expense	$ 8.7	$ 28.1	$ 9.5
Effective income tax rate	(66.40%)	188.60%	8.50%

Income Taxes - Components of In

Income Taxes - Components of Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current expense
Federal and other	$ 0.2	$ 1.8	$ 2
Foreign	28.6	25	28.5
Total current income tax expense	28.8	26.8	30.5
Deferred expense (benefit)
Federal and other	(16.7)	6.8	(16.5)
Foreign	(3.4)	(5.5)	(4.5)
Total deferred income tax (benefit) expense	(20.1)	1.3	(21)
Total income tax expense	$ 8.7	$ 28.1	$ 9.5

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets (Liabilities) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Compensation and benefits	$ 23,000,000	$ 15,500,000
Pension	23,400,000	23,200,000
Inventory	10,400,000	10,100,000
Other reserves	18,900,000	21,700,000
Accounts receivable	7,400,000	9,700,000
Foreign tax credit carryforwards	6,400,000	11,100,000
Net operating loss carryforwards	76,700,000	89,200,000
Interest expense carryforwards	26,300,000	17,000,000
Section 174 capitalization	17,300,000	7,300,000
General business tax credit carryforwards	3,400,000	0
Other	5,200,000	600,000
Gross deferred income tax assets	218,400,000	205,400,000
Valuation allowance	(59,200,000)	(51,900,000)
Net deferred tax assets	159,200,000	153,500,000
Deferred tax liabilities
Depreciation	(5,700,000)	(8,900,000)
Unremitted non-U.S. earnings accrual	(4,000,000)	(5,500,000)
Identifiable intangibles	(170,400,000)	(182,900,000)
Other	0	(600,000)
Gross deferred tax liabilities	(180,100,000)	(197,900,000)
Net deferred tax liabilities	$ (20,900,000)	$ (44,400,000)

Income Taxes - Schedule of Unre

Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 39.1	$ 43.3	$ 45.1
Additions for tax positions of prior years	3.6	2.5	4.5
Reductions for tax positions of prior years	(17.7)	(8.3)	(4.2)
Increase (decrease) resulting from foreign currency translation	3	1.6	(2.1)
Balance at end of year	$ 28	$ 39.1	$ 43.3

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2023	Mar. 31, 2019	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2012
Income Tax Examination [Line Items]
U.S. statutory rate				21%	21%	21%
Income tax expense				$ 8,700,000	$ 28,100,000	$ 9,500,000
(Loss) income before income tax				$ (13,100,000)	$ 14,900,000	$ 111,400,000
Effective tax rate				(66.40%)	188.60%	8.50%
Valuation allowance	$ 59,200,000			$ 59,200,000	$ 51,900,000
Increase in valuation allowance				7,300,000
Increase to existing valuation allowance				5,400,000
Operating loss carryforwards	12,900,000			12,900,000
Federal general business credit carryforwards	3,400,000			3,400,000	0
Operating loss carryforwards, valuation allowance	63,800,000			63,800,000
Deferred taxes for undistributed earnings of foreign subsidiaries				4,000,000
Undistributed earnings of foreign subsidiaries not permanently reinvested	249,200,000			249,200,000
Undistributed earnings of foreign subsidiaries	272,700,000			272,700,000
Foreign tax credit carryforwards	6,400,000			6,400,000	11,100,000
Unrecognized tax benefits	28,000,000			28,000,000	39,100,000	$ 43,300,000	$ 45,100,000
Unrecognized tax benefits, income tax penalties and interest accrued	$ 15,800,000			15,800,000
Excess benefit from stock-based compensation				(600,000)	(500,000)	(500,000)
Additions for tax positions of prior years				$ 3,600,000	2,500,000	4,500,000
Minimum global tax	15%			15%
Standard penalty cancellation percentage			75%
Penalties, interest and other fees penalties	$ 13,300,000
Minimum
Income Tax Examination [Line Items]
Reasonably possible change in unrecognized tax benefit	1,500,000			$ 1,500,000
Maximum
Income Tax Examination [Line Items]
Reasonably possible change in unrecognized tax benefit	2,500,000			2,500,000
Foreign Currency Translation
Income Tax Examination [Line Items]
Increase in valuation allowance				$ 1,900,000
Domestic Tax Authority | Internal Revenue Service (IRS) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year				2019
Foreign Tax Authority
Income Tax Examination [Line Items]
Operating loss carryforwards	281,300,000			$ 281,300,000
Foreign Tax Authority | Minimum
Income Tax Examination [Line Items]
Statutes of limitation, period				2 years
Foreign Tax Authority | Maximum
Income Tax Examination [Line Items]
Statutes of limitation, period				6 years
Foreign Tax Authority | Australian Taxation Office | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year				2018
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Income Tax Examination [Line Items]
Income tax examination, interest expense				$ 900,000	$ 1,500,000	$ 500,000
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year				2018
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2008 to 2010
Income Tax Examination [Line Items]
Additions for tax positions of prior years		$ 5,600,000
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Years 2007-2012
Income Tax Examination [Line Items]
Unrecognized tax benefits								$ 44,500,000
Potential tax assessment, accrued reserve related to fair value of liabilities acquired								$ 43,300,000
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007 to 2010 | Other non-current liabilities
Income Tax Examination [Line Items]
Unrecognized tax benefits	$ 21,700,000			$ 21,700,000
Foreign Tax Authority | Canada Revenue Agency | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year				2018
Foreign Tax Authority | Federal Ministry of Finance, Germany | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year				2020
Foreign Tax Authority | Swedish Tax Agency (Skatteverket) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year				2021
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year				2021

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Common stock outstanding (in shares)	94,925,652	94,260,926	95,800,000
Common stock repurchases (in shares)	0	2,700,000	0
Shares related to tax withholding for share-based compensation (in shares)	300,000	300,000	100,000
Potentially dilutive shares excluded from computation of dilutive earnings per share (in shares)	9,900,000	9,800,000	8,300,000

Earnings Per Share - Summary of

Earnings Per Share - Summary of Number of Weighted-Average Shares Outstanding (Details) - shares shares in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted-average number of common shares outstanding - basic (in shares)		95.3	95.3	95.5
Weighted-average number of common shares outstanding - diluted (in shares)	[1]	95.3	95.3	97.1
Employee Stock Option
Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract]
Incremental dilutive common shares (in shares)		0	0	0.1
Restricted stock units
Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract]
Incremental dilutive common shares (in shares)		0		1.5
[1] Due to the net loss during the twelve months ended December 31, 2023 and 2022, the denominator in the diluted earnings per share calculation does not include the effects of the stock awards for which the average market price for the period exceeds the exercised price, as it would result in a less dilutive computation. As a result, diluted earnings per share for the twelve months ended December 31, 2023 and 2022 are the same as basic earnings per share.

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) - Foreign exchange contracts - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Derivatives not designated as hedging instruments
Derivative [Line Items]
U.S. dollar equivalent notional value	$ 102,300,000	$ 79,500,000
Cash Flow Hedging | Derivatives designated as hedging instruments
Derivative [Line Items]
U.S. dollar equivalent notional value	$ 80,200,000	$ 108,300,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 4.5	$ 9.2
Derivative Liabilities	4.9	7.5
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0.3	3.6
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1.6	1.9
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0.7
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0.1	0.7
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other non-current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	3.2	4.9
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other non-current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 3.2	$ 4.9

Derivative Financial Instrume_5

Derivative Financial Instruments - Effect of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI (Effective Portion)	$ 0.4	$ 9.8	$ 9.1
Foreign exchange contracts | Cost of products sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Reclassified from AOCI to Income (Effective Portion)	(2.8)	(14)	1
Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Income	$ 0.1	$ (3.7)	$ 0

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Schedule of Fair Value Assets and Liabilities Measured on a Recurring Basis (Details) - Significant Other Observable Inputs (Level 2) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Forward currency contracts, assets	$ 4.5	$ 9.2
Forward currency contracts, liabilities	$ 4.9	$ 7.5

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt	$ 925.6	$ 1,004.9
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of total debt	$ 870.9	$ 910

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	$ 810.1	$ 864.8
Balance at end of period	787	810.1
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	1.1	4
Other comprehensive income (loss) before reclassifications, net of tax	0.2	7
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(2)	(9.9)
Balance at end of period	(0.7)	1.1
Foreign Currency Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	(380.1)	(342.2)
Other comprehensive income (loss) before reclassifications, net of tax	30.3	(37.9)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Balance at end of period	(349.8)	(380.1)
Unrecognized Pension and Other Post-retirement Benefit Costs
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	(161.3)	(197.3)
Other comprehensive income (loss) before reclassifications, net of tax	(20)	29.1
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	5.5	6.9
Balance at end of period	(175.8)	(161.3)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	(540.3)	(535.5)
Other comprehensive income (loss) before reclassifications, net of tax	10.5	(1.8)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	3.5	(3)
Balance at end of period	$ (526.3)	$ (540.3)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold		$ 1,234.5	$ 1,395.3	$ 1,410.4
Income (loss) before income tax		(8.7)	(28.1)	(9.5)
Net income (loss)		21.8	13.2	(101.9)
Income before income tax		(13.1)	14.9	111.4
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)		(3.5)	3	(9.9)
Unrecognized Pension and Other Post-retirement Benefit Costs | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income tax		0.7	1.6	2.9
Net income (loss)		(5.5)	(6.9)	(9.1)
Amortization of actuarial loss	[1]	(5.9)	(8.2)	(10.2)
Amortization of prior service cost	[1]	(0.3)	(0.3)	(1.8)
Income before income tax		(6.2)	(8.5)	(12)
Foreign exchange contracts | Derivative Financial Instruments | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold		2.8	14	(1)
Income (loss) before income tax		(0.8)	(4.1)	0.2
Net income (loss)		$ 2	$ 9.9	$ (0.8)
[1] These AOCI components are included in the computation of net periodic benefit (income) cost for pension and post-retirement plans (See "Note 5 . Pension and Other Retiree Benefits" for additional details).

Revenue Recognition - Service o

Revenue Recognition - Service or Extended Maintenance Agreements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Unearned revenue associated with outstanding contracts	$ 2.9	$ 2.8
Revenue recognized	$ 2.4

Revenue Recognition - Unearned

Revenue Recognition - Unearned Revenue (Details) $ in Millions	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unearned revenue	$ 2.5
Expected timing of satisfaction	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unearned revenue	$ 0.4
Expected timing of satisfaction	12 months

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Net sales	[1]	$ 1,832.8	$ 1,947.6	$ 2,025.3
Product and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales		1,794.1	1,899.5	1,975.9
Product and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales		38.7	48.1	49.4
ACCO Brands North America
Disaggregation of Revenue [Line Items]
Net sales		887.2	998	1,042.4
ACCO Brands North America | United States
Disaggregation of Revenue [Line Items]
Net sales		792.2	889.2	934.2
ACCO Brands North America | Canada
Disaggregation of Revenue [Line Items]
Net sales		95	108.8	108.2
ACCO Brands EMEA
Disaggregation of Revenue [Line Items]
Net sales	[1],[2]	547.2	580.3	662.9
ACCO Brands International
Disaggregation of Revenue [Line Items]
Net sales		398.4	369.3	320
ACCO Brands International | Australia/N.Z.
Disaggregation of Revenue [Line Items]
Net sales		118.5	125.6	140.3
ACCO Brands International | Latin America
Disaggregation of Revenue [Line Items]
Net sales		244.5	197.5	125.5
ACCO Brands International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Net sales		$ 35.4	$ 46.2	$ 54.2
[1] Net sales are attributed to geographic areas based on the location of the selling subsidiaries ACCO Brands EMEA is comprised largely of Europe, but also includes export sales to the Middle East and Africa.

Information on Business Segme_3

Information on Business Segments - Narrative (Details) $ in Millions		12 Months Ended
	Jan. 01, 2024 Segment	Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment		3
Subsequent Event
Segment Reporting Information [Line Items]
Number of operating segments | Segment	2
Sales Revenue, Net | Customer Concentration Risk | Top five customers
Segment Reporting Information [Line Items]
Concentration risk, sales | $		$ 609	$ 663.3	$ 720.9
Accounts Receivable | Customer Concentration Risk | Top five customers
Segment Reporting Information [Line Items]
Concentration risk, trade accounts receivable | $		$ 138.1	$ 125.6

Information on Business Segme_4

Information on Business Segments - Net Sales by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 1,832.8	$ 1,947.6	$ 2,025.3
ACCO Brands North America
Segment Reporting Information [Line Items]
Net sales	887.2	998	1,042.4
ACCO Brands EMEA
Segment Reporting Information [Line Items]
Net sales	547.2	580.3	662.9
ACCO Brands International
Segment Reporting Information [Line Items]
Net sales	$ 398.4	$ 369.3	$ 320

Information on Business Segme_5

Information on Business Segments - Schedule of Operating (Loss) Income by Business Segment (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating income	[1]	$ 44.7	$ 34.8	$ 151
Change in fair value of contingent consideration		0	9	(19)
Interest expense		58.6	45.6	46.3
Interest income		(7.1)	(8.3)	(1.9)
Non-operating pension expense (income)		1.8	(4.5)	(7.9)
Other expense (income), net		4.5	(12.9)	3.1
(Loss) income before income tax		(13.1)	14.9	111.4
Operating Segments
Segment Reporting Information [Line Items]
Operating income		93.5	67.3	215.2
Corporate
Segment Reporting Information [Line Items]
Operating income	[2]	(48.8)	(41.5)	(45.2)
Transaction costs				0.2
ACCO Brands North America | Operating Segments
Segment Reporting Information [Line Items]
Operating income		(5.9)	(4.9)	121.9
ACCO Brands EMEA | Operating Segments
Segment Reporting Information [Line Items]
Operating income		38.7	21.7	61.7
ACCO Brands International | Operating Segments
Segment Reporting Information [Line Items]
Operating income		$ 60.7	$ 50.5	$ 31.6
[1] Operating income as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less SG&A expenses; iv) less amortization of intangibles; v) less restructuring charges; and vi) less change in the fair value of contingent consideration. Corporate operating loss in 2021 includes transaction costs of $ 0.2 million primarily for legal and due diligence expenditures associated with acquisitions.

Information on Business Segme_6

Information on Business Segments - Assets by Segment (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Assets		$ 2,644.8	$ 2,794.7
Operating Segments
Segment Reporting Information [Line Items]
Assets		957	1,003.6
Unallocated Assets
Segment Reporting Information [Line Items]
Assets		1,684.2	1,787.2
Corporate
Segment Reporting Information [Line Items]
Assets		3.6	3.9	[1]
ACCO Brands North America | Operating Segments
Segment Reporting Information [Line Items]
Assets	[1]	401.4	459.2
ACCO Brands EMEA | Operating Segments
Segment Reporting Information [Line Items]
Assets	[1]	217.1	236
ACCO Brands International | Operating Segments
Segment Reporting Information [Line Items]
Assets	[1]	$ 338.5	$ 308.4
[1] Represents total assets, excluding goodwill and identifiable intangibles resulting from business acquisitions, intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs and right of use asset, leases.

Information on Business Segme_7

Information on Business Segments - Identifiable Intangibles and Goodwill by Segment (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		$ 2,644.8	$ 2,794.7
Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		2,362.8	2,522.1
Unallocated Assets
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		278.4	268.7
Corporate
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill		3.6	3.9
ACCO Brands North America | Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	1,190.7	1,359.9
ACCO Brands EMEA | Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	568.7	588.4
ACCO Brands International | Operating Segments
Segment Reporting Information [Line Items]
Assets Including Allocation of Identifiable Intangible Assets and Goodwill	[1]	$ 603.4	$ 573.8
[1] Represents total assets, excluding intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs.

Information on Business Segme_8

Information on Business Segments - Capital Spend by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total capital spend	$ 15.3	$ 17.7	$ 21.2
ACCO Brands North America
Segment Reporting Information [Line Items]
Total capital spend	4	8.8	11.2
ACCO Brands EMEA
Segment Reporting Information [Line Items]
Total capital spend	6.8	4.7	7.3
ACCO Brands International
Segment Reporting Information [Line Items]
Total capital spend	$ 4.5	$ 4.2	$ 2.7

Information on Business Segme_9

Information on Business Segments - Depreciation Expense by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total depreciation	$ 32.7	$ 37.9	$ 39.4
ACCO Brands North America
Segment Reporting Information [Line Items]
Total depreciation	16.8	20.1	20.7
ACCO Brands EMEA
Segment Reporting Information [Line Items]
Total depreciation	10.9	12.6	13.1
ACCO Brands International
Segment Reporting Information [Line Items]
Total depreciation	$ 5	$ 5.2	$ 5.6

Information on Business Segm_10

Information on Business Segments - Property, Plant and Equipment by Geographic Region (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Property, plant and equipment, net	[1]	$ 170.1	$ 185.1
ACCO Brands North America
Segment Reporting Information [Line Items]
Property, plant and equipment, net		69.7	84
ACCO Brands North America | U.S.
Segment Reporting Information [Line Items]
Property, plant and equipment, net		68.2	82.3
ACCO Brands North America | Canada
Segment Reporting Information [Line Items]
Property, plant and equipment, net		1.5	1.7
ACCO Brands EMEA | EMEA
Segment Reporting Information [Line Items]
Property, plant and equipment, net		60.9	62.9
ACCO Brands International
Segment Reporting Information [Line Items]
Property, plant and equipment, net		39.5	38.2
ACCO Brands International | Australia/N.Z.
Segment Reporting Information [Line Items]
Property, plant and equipment, net		9.5	10
ACCO Brands International | Latin America
Segment Reporting Information [Line Items]
Property, plant and equipment, net		29.1	26.6
ACCO Brands International | Asia-Pacific
Segment Reporting Information [Line Items]
Property, plant and equipment, net		$ 0.9	$ 1.6
[1] Net property, plant and equipment as of December 31, 2023 and 2022 contained $ 37.9 million and $ 52.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $ 14.1 million , $ 13.9 million and $ 12.9 million for the years ended December 31, 2023, 2022, and 2021 , respectively.

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Tax credits		$ 2.2	$ 1.9	$ 2.1
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Loss Contingencies [Line Items]
Brazil tax credits		$ 1.3	$ 11.1
Forecast | Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Loss Contingencies [Line Items]
Tax credits	$ 1.9

Commitments and Contingencies_2

Commitments and Contingencies - Purchase Commitments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2024	$ 102.1
2025	6.9
2026	3.1
2027	0.2
2028	0.1
Thereafter	0.1
Total unconditional purchase commitments	$ 112.5

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 9.1	$ 10	$ 11.4
Additions charged to expense	1.3	0.5	0.9
Deductions	(1.6)	(1.5)	(1.9)
Foreign exchange changes	0.5	0.1	(0.4)
Balance at end of year	9.3	9.1	10
Allowance for Sales Discounts and Other Credits
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	15.6	15.2	12.2
Additions charged to expense	8.1	15.7	28.9
Deductions	(11.8)	(13.8)	(25.8)
Foreign exchange changes	(0.3)	(1.5)	(0.1)
Balance at end of year	11.6	15.6	15.2
Allowance for Cash Discounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	1.9	2.4	1.9
Additions charged to expense	20.7	22.9	22.8
Deductions	(20.7)	(23.3)	(22.2)
Foreign exchange changes	0.1	(0.1)	(0.1)
Balance at end of year	2	1.9	2.4
Warranty Reserves
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	6.4	5.7	6.1
Additions charged to expense	3.8	5.3	2.9
Deductions	(4.5)	(4.3)	(2.9)
Foreign exchange changes	0.3	(0.3)	(0.4)
Balance at end of year	6	6.4	5.7
Income Tax Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	51.9	52.4	55.4
Additions charged to expense	5.4	3.2	(2.2)
Foreign exchange changes	1.9	(3.7)	(0.8)
Balance at end of year	$ 59.2	$ 51.9	$ 52.4