ACCO Brands (ACCO) 10-Q 28 Apr 21 2021 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 22, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
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 $0.01 per share
Trading Symbol	ACCO
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		95,491,857
Entity Central Index Key	0000712034
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 75.1	$ 36.6
Accounts receivable, net	307.8	356
Inventories	351.2	305.1
Other current assets	45.7	30.5
Total current assets	779.8	728.2
Total property, plant and equipment	648.1	657.8
Less: accumulated depreciation	(418.9)	(416.4)
Property, plant and equipment, net	229.2	241.4
Right of use asset, leases	84.1	89.2
Deferred income taxes	124.4	136.5
Goodwill	799.7	827.4
Identifiable intangibles, net	947.9	977
Other non-current assets	36.6	49
Total assets	3,001.7	3,048.7
Current liabilities:
Notes payable	11.4	5.7
Current portion of long-term debt	36.8	70.8
Accounts payable	187.7	180.2
Accrued compensation	36.3	41
Accrued customer program liabilities	71.7	91.4
Lease liabilities	21.5	22.6
Current portion of contingent consideration	16.2	10.4
Other current liabilities	117.2	134.8
Total current liabilities	498.8	556.9
Long-term debt, net	1,155.9	1,054.6
Long-term lease liabilities	72	76.5
Deferred income taxes	153.1	170.6
Pension and post-retirement benefit obligations	297.6	317.1
Contingent consideration	8.7	7.8
Other non-current liabilities	106.8	122.5
Total liabilities	2,292.9	2,306
Stockholders' equity:
Common stock	1	1
Treasury stock	(40.8)	(39.9)
Paid-in capital	1,889.9	1,883.1
Accumulated other comprehensive loss	(577.2)	(564.2)
Accumulated deficit	(564.1)	(537.3)
Total stockholders' equity	708.8	742.7
Total liabilities and stockholders' equity	$ 3,001.7	$ 3,048.7

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Net sales		$ 410.5	$ 384.1
Cost of products sold		295	271.9
Gross profit		115.5	112.2
Operating costs and expenses:
Selling, general and administrative expenses		94	86.1
Amortization of intangibles		12	8.4
Restructuring charges		3.9	0.3
Change in fair value of contingent consideration		6.7	0
Total operating costs and expenses		116.6	94.8
Operating (loss) income	[1]	(1.1)	17.4
Non-operating expense (income):
Interest expense		13.2	8.6
Interest income		(0.1)	(0.3)
Non-operating pension income		(0.8)	(1.5)
Other expense (income), net		12.9	(0.5)
(Loss) income before income tax		(26.3)	11.1
Income tax (benefit) expense		(5.9)	3.1
Net (loss) income		$ (20.4)	$ 8
Basic income per share:
Basic (loss) income per share		$ (0.21)	$ 0.08
Diluted income per share:
Diluted (loss) income per share		$ (0.21)	$ 0.08
Weighted average number of shares outstanding:
Basic		95.1	96
Diluted		95.1	97.5
[1]	Operating income (loss) as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less selling, general and administrative expenses; iv) less amortization of intangibles; v) less restructuring charges; and vi) less change in the fair value of contingent consideration.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (20.4)	$ 8
Other comprehensive income (loss), net of tax:
Unrealized income on derivative instruments, net of tax expense of $(1.8) and $(0.9), respectively	4.1	2.4
Foreign currency translation adjustments, net of tax (expense) benefit of $(1.5) and $2.1, respectively	(20.7)	(49.7)
Recognition of deferred pension and other post-retirement items, net of tax expense of $(1.2) and $(2.4), respectively	3.6	7.9
Other comprehensive loss, net of tax	(13)	(39.4)
Comprehensive loss	$ (33.4)	$ (31.4)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Loss (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Unrealized income on derivative instruments, net of tax expense of $(1.8) and $(0.9), respectively	$ (1.8)	$ (0.9)
Foreign currency translation adjustments, net of tax (expense) benefit of $(1.5) and $2.1, respectively	(1.5)	2.1
Recognition of deferred pension and other post-retirement items, net of tax expense of $(1.2) and $(2.4), respectively	$ (1.2)	$ (2.4)

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net (loss) income	$ (20.4)	$ 8
Amortization of inventory step-up	2.4	0
Change in fair value of contingent consideration	6.7	0
Depreciation	9.6	8.6
Amortization of debt issuance costs	0.8	0.5
Amortization of intangibles	12	8.4
Stock-based compensation	4.8	0.9
Loss on debt extinguishment	3.7	0
Changes in balance sheet items:
Accounts receivable	34.4	112
Inventories	(54.4)	(26.2)
Other assets	(13.3)	(13.8)
Accounts payable	11.3	(45.2)
Accrued expenses and other liabilities	(27.9)	(72.1)
Accrued income taxes	(12.1)	(6.3)
Net cash used by operating activities	(42.4)	(25.2)
Investing activities
Additions to property, plant and equipment	(3.8)	(6.9)
Payments to Acquire Businesses, Net of Cash Acquired	18.2	0.6
Net cash provided (used) by investing activities	14.4	(6.3)
Financing activities
Proceeds from long-term borrowings	595.8	117.4
Repayments of long-term debt	(509)	(5.3)
Proceeds of notes payable, net	6.2	12.4
Payment for debt premium	(9.8)	0
Payments for debt issuance costs	(9.7)	0
Dividends paid	(6.2)	(6.2)
Repurchases of common stock	0	(18.9)
Payments related to tax withholding for stock-based compensation	(0.9)	(1.7)
Proceeds from the exercise of stock options	1.9	1.5
Net cash provided by financing activities	68.3	99.2
Effect of foreign exchange rate changes on cash and cash equivalents	(1.8)	(2.1)
Net increase in cash and cash equivalents	38.5	65.6
Cash and cash equivalents
Beginning of the period	36.6	27.8
End of the period	75.1	93.4
Cash paid during the year for:
Interest	12.7	2.9
Income taxes	$ 7.2	$ 10.1

Consolidated Statements of Stoc

Consolidated Statements of Stockholders’ Equity - USD ($) $ in Millions	Total	Common Stock	Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Accumulated Deficit
Balance at start of period at Dec. 31, 2019	$ 773.7	$ 1	$ 1,890.8	$ (505.7)	$ (38.2)	$ (574.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	8					8
Gain (Loss) on derivative financial instruments, net of tax	2.4			2.4
Translation impact, net of tax	(49.7)			(49.7)
Pension and post-retirement adjustment, net of tax	7.9			7.9
Common stock repurchases	(18.9)		(18.9)
Stock-based compensation	0.9		0.9
Common stock issued, net of shares withheld for employee taxes	(0.2)		1.5		(1.7)
Dividends declared	(6.2)					(6.2)
Balance at end of period at Mar. 31, 2020	$ 717.9	$ 1	1,874.3	(545.1)	$ (39.9)	(572.4)
Balance at start of period (in shares) at Dec. 31, 2019	96,445,488	100,412,933			3,967,445
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes	692,421	898,664			206,243
Common stock repurchases	(2,690,292)	(2,690,292)
Balance at end of period (in shares) at Mar. 31, 2020	94,447,617	98,621,305			4,173,688
Balance at start of period at Dec. 31, 2020	$ 742.7	$ 1	1,883.1	(564.2)	$ (39.9)	(537.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(20.4)					(20.4)
Gain (Loss) on derivative financial instruments, net of tax	4.1			4.1
Translation impact, net of tax	(20.7)			(20.7)
Pension and post-retirement adjustment, net of tax	3.6			3.6
Stock-based compensation	4.8		5			(0.2)
Common stock issued, net of shares withheld for employee taxes	1		1.9		(0.9)
Dividends declared	(6.2)					(6.2)
Other	(0.1)		(0.1)
Balance at end of period at Mar. 31, 2021	$ 708.8	$ 1	$ 1,889.9	$ (577.2)	$ (40.8)	$ (564.1)
Balance at start of period (in shares) at Dec. 31, 2020	94,942,565	99,129,455			4,186,890
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes	543,156	652,755			109,599
Common stock repurchases	0
Balance at end of period (in shares) at Mar. 31, 2021	95,485,721	99,782,210			4,296,489

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Common stock, dividends per share, declared	$ 0.065	$ 0.065

Basis Of Presentation

Basis Of Presentation	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation	1. Basis of Presentation As used in this Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, the terms "ACCO Brands," "ACCO," the "Company," "we," "us," and "our" refer to ACCO Brands Corporation and its consolidated subsidiaries. The management of ACCO Brands Corporation is responsible for the accuracy and internal consistency of the preparation of the condensed consolidated financial statements and notes contained in this Quarterly Report on Form 10-Q. The condensed consolidated interim financial statements have been prepared pursuant to the rules and regulations of the SEC. Although the Company believes the disclosures are adequate to make the information presented not misleading, certain information and note disclosures normally included in annual financial statements prepared in accordance with generally accepted accounting principles in the U.S. ("GAAP") have been condensed or omitted pursuant to those rules and regulations. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. The Condensed Consolidated Balance Sheet as of March 31, 2021, the related Consolidated Statements of Operations, the Consolidated Statements of Comprehensive Loss, the Consolidated Statements of Stockholders' Equity for the three months ended March 31, 2021 and 2020 and Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020 are unaudited. The December 31, 2020 Condensed Consolidated Balance Sheet data was derived from audited financial statements, but does not include all annual disclosures required by GAAP. The above referenced financial statements included herein were prepared by management and reflect all adjustments (consisting solely of normal recurring items unless otherwise noted) which are, in the opinion of management, necessary for the fair presentation of results of operations and cash flows for the interim periods ended March 31, 2021 and 2020, and the financial position of the Company as of March 31, 2021. Interim results may not be indicative of results for a full year. Effective December 17, 2020, we completed the acquisition of PowerA (the "PowerA Acquisition"), a leading provider of third-party video gaming console accessories primarily in North America. The results of PowerA are included in all three of the Company's operating business segments effective December 17, 2020. The preliminary purchase price was $321.8 million, plus an additional earnout of up to $55.0 million in cash, which is contingent upon PowerA achieving one- and two- year sales and profit growth objectives and has a present value of $24.9 million as of March 31, 2021. The PowerA Acquisition and related expenses were funded by cash on hand, as well as borrowings from our revolving credit facility. See "Note 3. Acquisitions" for details on the PowerA Acquisition. The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported assets and liabilities at the date of the financial statements and the reported revenues and expenses during the reporting periods. Actual results could differ from those estimates.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements	2. Recent Accounting Pronouncements and Adopted Accounting Standards Recent Accounting Pronouncements In March 2020, the Financial Accounting Standards Board ("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. We are currently evaluating our contracts and hedging relationships that reference LIBOR and the potential effects of adopting this new guidance. The guidance can be adopted immediately and is applicable to contracts entered into on or before December 31, 2022. There are 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 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 condensed consolidated financial statements. There were no other accounting standards that were adopted in the first three months of 2021 that had a material effect on the Company’s financial condition, results of operations or cash flow.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Acquisitions	3. Acquisitions Acquisition of PowerA Effective December 17, 2020, we completed the acquisition of PowerA, a leading provider of third-party video gaming console accessories primarily in North America. The results of PowerA are included in all three of the Company's reporting units effective December 17, 2020. The preliminary purchase price was $321.8 million, plus an additional earnout of up to $55.0 million in cash, which is contingent upon PowerA achieving one- and two- year sales and profit growth objectives and has a fair value of $24.9 million as of March 31, 2021. The PowerA Acquisition and related expenses were funded by cash on hand, as well as borrowings from our revolving credit facility. During the first quarter of 2021, the Company received a working capital adjustment of $18.2 million recorded as a reduction to the preliminary purchase price recorded at December 31, 2020 of $340.0 million. For accounting purposes, the Company was the acquiring enterprise. The PowerA Acquisition is being accounted for as a purchase business combination and PowerA's results are included in the Company’s consolidated financial statements as of December 31, 2020. The additional net sales from PowerA during the three months ended March 31, 2021 we re $62.7 million. The following table presents the preliminary allocation of the consideration given to the fair values of the assets acquired and liabilities assumed at the date of the PowerA Acquisition: (in millions) At December 17, 2020 Calculation of Goodwill: Purchase price, net of working capital adjustment $ 321.8 Fair value of contingent consideration $ 18.2 Plus fair value of liabilities assumed: Accrued liabilities 9.2 Fair value of liabilities assumed $ 9.2 Less fair value of assets acquired: Inventory 28.7 Property and equipment 0.2 Identifiable intangibles 239.7 Other assets 13.2 Fair value of assets acquired $ 281.8 Goodwill $ 67.4 We are continuing our review of the fair value estimate of assets acquired and liabilities assumed, during the measurement period, which will conclude as soon as we receive the information we are seeking about facts and circumstances that existed as of the acquisition date or learn that more information is not available. This measurement period will not exceed one year from the acquisition date. The excess of the purchase price over the fair value of net assets acquired is allocated to goodwill. The preliminary goodwill of $67.4 million is primarily attributable to synergies expected to be realized from leveraging our geographic footprint and from the existence of an assembled workforce. Our fair value estimate of assets acquired and liabilities assumed is pending the completion of several elements, including the final determination of the purchase price, pending final determination of the fair value of the assets acquired and liabilities assumed, and the final review by our management. The primary areas that are not yet finalized relate to intangible assets and contingent consideration. In particular, the determination of the preliminary fair value of the customer relationships and vendor relationships intangible assets required us to make significant estimates and assumptions regarding (1) future revenue growth rates, (2) future cost of sales and operating expenses, (3) attrition rate, (4) future cash flows without vendor relationships, and (5) discount rates. Accordingly, there could be material adjustments to our consolidated financial statements, including changes in our amortization expense related to the valuation of intangible assets and their respective useful lives, among other adjustments. The final determination of the purchase price, fair values and resulting goodwill may differ significantly from what is reflected in these consolidated financial statements. During the year ended December 31, 2020, transaction costs related to the PowerA Acquisition were $3.7 million, and for the quarter ending March 31, 2021, they wer e $0.1 million. These costs were reported as SG&A expenses in the Company's Consolidated Statements of Operations. Unaudited Pro Forma Consolidated Results The unaudited pro forma information presented below is not intended to represent, nor do we believe it is indicative of, the consolidated results of operations of the Company that would have been reported had the PowerA Acquisition been completed on January 1, 2019. Furthermore, the unaudited pro forma information does not give effect to the anticipated synergies or other anticipated benefits of the PowerA Acquisition. Had the PowerA Acquisition occurred on January 1, 2019, unaudited pro forma consolidated results of the Company for the three months ended March 31, 2021 and 2020 w ould have been as follows: (in millions) 2021 2020 Net sales $ 410.5 $ 414.6 Net (loss) income (20.4) 8.0 Net (loss) income per common share (diluted) $ (0.21) $ 0.08 The pro forma amounts are based on the Company's historical results and the historical results for the acquired PowerA business. The pro forma results of operations have been adjusted to include amortization of finite-lived intangibles, and other charges related to the PowerA Acquisition accounting.

Long-Term Debt And Short-Term B

Long-Term Debt And Short-Term Borrowings	3 Months Ended
	Mar. 31, 2021
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% • eliminate the LIBOR rate floor for U.S. Dollar loans. Under the Fifth Amendment, pricing will be locked at LIBOR plus 2.25 percent until the Company publishes its financial results for the fiscal quarter ending June 30, 2021, and is subject to the above leverage-based pricing grid thereafter. Senior Unsecured Notes On March 15, 2021, the Company completed a private offering of $575.0 million in aggregate principal amount of 4.25% Senior Notes due March 2029 (the "New Notes"), which were issued under an indenture, dated as of March 15, 2021 (the "New Indenture"), among the Company, as issuer, the guarantors named therein and Wells Fargo Bank, National Association, as trustee. The Company will pay interest on the New Notes semiannually on March 15 and September 15 of each year, beginning on September 15, 2021. The New Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by each of the Company’s existing and future U.S. subsidiaries, other than certain excluded subsidiaries. The New Indenture contains covenants that limit the ability of the Company and its restricted subsidiaries’ ability 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) in the case of a restricted subsidiary, ability 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 New 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 New Notes to be immediately due and payable. In addition, effective March 15, 2021, the Company irrevocably deposited with the trustee of its 5.25% Senior Notes due 2024 (the "Prior Notes") an amount necessary to pay the aggregate redemption price for the Prior Notes, and satisfied and discharged all its obligations related to the Prior Notes indenture. Proceeds from the offering of the New Notes were applied toward the payment of the aggregate redemption price for the Prior Notes, the repayment of approximately $178.0 million of the Company’s outstanding borrowings under its Revolving Facility and to pay fees and expenses related to the offering of the New Notes. The Prior Notes were redeemed on March 31, 2021 at an aggregate redemption price of $390.6 million, consisting of $375 million of the principal due and payable on the Prior Notes, a call premium of $9.8 million (included in " Other expense (income), net "), and accrued and unpaid interest of $5.8 million (included in "Interest expense"). Also included in " Other expense (income), net " is a $3.7 million charge for the write-off of debt issuance costs. Additionally, we incurred and capitalized approximately $8.2 million in bank, legal and other fees associated with the issuance of the New Notes. As of March 31, 2021, there were $218.9 million in borrowings outstanding under the Revolving Facility. The remaining amount available for borrowings was $367.1 million (allowing for $14.0 million of letters of credit outstanding on that date). As of March 31, 2021, our Consolidated Leverage Ratio was approximately 4.50 to 1.00 versus our maximum covenant of 5.25 to 1.00." id="sjs-B4">4. 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 March 31, 2021 and December 31, 2020: (in millions) March 31, December 31, Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.25% at March 31, 2021) $ 273.9 $ — Euro Senior Secured Term Loan A, due May 2024 (floating interest rate of 2.50% at December 31, 2020) — 287.4 USD Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.45% at March 31, 2021) 92.5 — USD Senior Secured Term Loan A, due May 2024 (floating interest rate of 3.50% at December 31, 2020) — 92.5 Australian Dollar Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.31% at March 31, 2021) 42.8 — Australian Dollar Senior Secured Term Loan A, due May 2024 (floating interest rate of 2.57% at December 31, 2020) — 43.4 U.S. Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 2.47% at March 31, 2021) 173.3 — U.S. Dollar Senior Secured Revolving Credit Facility, due May 2024 (floating interest rate of 3.50% at December 31, 2020) — 307.2 Australian Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 2.31% at March 31, 2021) 45.6 — Australian Dollar Senior Secured Revolving Credit Facility, due May 2024 (floating interest rate of 2.57% at December 31, 2020) — 25.4 Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25%) 575.0 — Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%) — 375.0 Other borrowings 11.4 5.7 Total debt 1,214.5 1,136.6 Less: Current portion 48.2 76.5 Debt issuance costs, unamortized 10.4 5.5 Long-term debt, net $ 1,155.9 $ 1,054.6 The Company entered into 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 provided for a five-year senior secured credit facility, which consisted of a €300.0 million (US$320.8 million based on January 27, 2017, exchange rates) term loan facility (the "Euro Term Loan"), an A$80.0 million (US$60.4 million based on January 27, 2017, exchange rates) term loan facility (the "Australian Term Loan"), and a US$400.0 million multi-currency revolving credit facility (the "Revolving Facility"). Effective July 26, 2018, the Company entered into the First Amendment (the "First Amendment") to the Credit Agreement. The First Amendment increased the aggregate revolving credit commitments under the Revolving Facility by $100.0 million such that, after giving effect to such increase, the aggregate amount of revolving credit available under the Revolving Facility was $500.0 million. In addition, the First Amendment also affected certain technical amendments to the Credit Agreement, including the addition of provisions relating to LIBOR successor rate procedures if LIBOR becomes unascertainable or is discontinued in the future and to expressly permit certain intercompany asset transfers. The changes related to LIBOR successor rate procedures are not expected to have a material effect on the Company. Effective May 23, 2019, the Company entered into a Second Amendment (the "Second Amendment") to the Credit Agreement. Pursuant to the Second Amendment, the Credit Agreement was amended to, among other things: • extend the maturity date to May 23, 2024; • further increase the aggregate revolving credit commitments under the Revolving Facility from $500.0 million to $600.0 million; • establish a new term loan facility denominated in U.S. Dollars in an aggregate principal amount of $100.0 million (the "USD Term Loan"); • replace 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; and • reflect a more favorable restricted payment covenant, with the Consolidated Leverage Ratio (as defined in the Credit Agreement) hurdle for unlimited restricted payments (including share repurchases and dividends) as calculated under the Credit Agreement increasing from 2.50:1.00 to 3.25:1.00; The USD Term Loan, the Euro Term Loan and the Australian Term Loan are collectively referred to herein as the “Term Loan Facility.” On May 1, 2020, the Company entered into a Third Amendment (the "Third Amendment") to the Credit Agreement pursuant to which the Credit Agreement was amended to, among other things: • increase the maximum Consolidated Leverage Ratio from 3.75:1.00 to 4.75:1.00, stepping back down to 3.75:1.00 for the first fiscal quarter ending after June 30, 2021; • amend the pricing based on the Company’s Consolidated Leverage Ratio, with a scaled increase in interest rates and fees, effective May 1, 2020; • reduce the Company’s capacity to incur certain other indebtedness, and impose additional limitations on certain restricted payments (other than dividends) and permitted acquisitions; and • require that the Company pay down any amounts on the Revolving Facility when cash and cash equivalents of the loan parties exceed $100.0 million. In connection with the PowerA Acquisition, effective November 10, 2020, the Company entered into a Fourth Amendment (the "Fourth Amendment") to the Credit Agreement pursuant to which the Credit Agreement was amended to, among other things: • provide flexibility under the permitted acquisition provisions to accommodate the acquisition of PowerA; • further amend the maximum Consolidated Leverage Ratio financial covenant by 0.50:1.00 from current levels for each of the six fiscal quarters beginning March 31, 2021 and ending June 30, 2022, as follows: Quarter Ended Maximum Consolidated Leverage Ratio March 2021 5.25:1.00 June 2021 5.25:1.00 September 2021 4.75:1.00 December 2021 4.25:1.00 March 2022 4.25:1.00 June 2022 4.25:1.00 September 2022 and thereafter 3.75:1.00 • exempt the borrowings made under the Credit Agreement, as amended, to fund the PowerA Acquisition from the Credit Agreement’s anti-cash hoarding clause. We incurred and capitalized approximately $3.2 million in bank, legal and other fees associated with the Third and Fourth Amendments. Effective March 31, 2021, the Company entered into a Fifth Amendment (the “Fifth Amendment”) to the Credit Agreement. Pursuant to the Fifth Amendment, the Credit Agreement was amended to, among other things: • further extend the maturity date from May 23, 2024 to March 31, 2026; • further modify the maximum Consolidated Leverage Ratio financial covenant such that for the fiscal quarter ending September 30, 2022 and thereafter, the maximum leverage ratio is set at 4.00:1.00; • reflect more favorable pricing at higher Consolidated Leverage Ratio levels along with lower fees on undrawn amounts, 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% • eliminate the LIBOR rate floor for U.S. Dollar loans. Under the Fifth Amendment, pricing will be locked at LIBOR plus 2.25 percent until the Company publishes its financial results for the fiscal quarter ending June 30, 2021, and is subject to the above leverage-based pricing grid thereafter. Senior Unsecured Notes On March 15, 2021, the Company completed a private offering of $575.0 million in aggregate principal amount of 4.25% Senior Notes due March 2029 (the "New Notes"), which were issued under an indenture, dated as of March 15, 2021 (the "New Indenture"), among the Company, as issuer, the guarantors named therein and Wells Fargo Bank, National Association, as trustee. The Company will pay interest on the New Notes semiannually on March 15 and September 15 of each year, beginning on September 15, 2021. The New Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by each of the Company’s existing and future U.S. subsidiaries, other than certain excluded subsidiaries. The New Indenture contains covenants that limit the ability of the Company and its restricted subsidiaries’ ability 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) in the case of a restricted subsidiary, ability 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 New 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 New Notes to be immediately due and payable. In addition, effective March 15, 2021, the Company irrevocably deposited with the trustee of its 5.25% Senior Notes due 2024 (the "Prior Notes") an amount necessary to pay the aggregate redemption price for the Prior Notes, and satisfied and discharged all its obligations related to the Prior Notes indenture. Proceeds from the offering of the New Notes were applied toward the payment of the aggregate redemption price for the Prior Notes, the repayment of approximately $178.0 million of the Company’s outstanding borrowings under its Revolving Facility and to pay fees and expenses related to the offering of the New Notes. The Prior Notes were redeemed on March 31, 2021 at an aggregate redemption price of $390.6 million, consisting of $375 million of the principal due and payable on the Prior Notes, a call premium of $9.8 million (included in " Other expense (income), net "), and accrued and unpaid interest of $5.8 million (included in "Interest expense"). Also included in " Other expense (income), net " is a $3.7 million charge for the write-off of debt issuance costs. Additionally, we incurred and capitalized approximately $8.2 million in bank, legal and other fees associated with the issuance of the New Notes. As of March 31, 2021, there were $218.9 million in borrowings outstanding under the Revolving Facility. The remaining amount available for borrowings was $367.1 million (allowing for $14.0 million of letters of credit outstanding on that date). As of March 31, 2021, our Consolidated Leverage Ratio was approximately 4.50 to 1.00 versus our maximum covenant of 5.25 to 1.00.

Leases

Leases	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Leases	5. 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 Condensed Consolidated Balance Sheets. 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 the 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 were as follows: Three Months Ended March 31, (in millions) 2021 2020 Operating lease cost $ 7.2 $ 7.3 Sublease income (0.3) (0.4) Total lease cost $ 6.9 $ 6.9 Other information related to leases was as follows: Three Months Ended March 31, (in millions, except lease term and discount rate) 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 7.2 $ 7.3 Right-of-use assets obtained in exchange for lease obligations: Operating leases 4.2 1.0 As of March 31, 2021 Weighted average remaining lease term: Operating leases 6.3 years Weighted average discount rate: Operating leases 5.3 % Future minimum lease payments, net of sub-lease income, for all non-cancelable leases as of March 31, 2021, were as follows: (in millions) 2021 $ 20.1 2022 20.7 2023 16.1 2024 13.3 2025 9.9 2026 8.3 Thereafter 24.2 Total minimum lease payments 112.6 Less imputed interest 19.1 Future minimum payments for leases, net of sublease rental income and imputed interest $ 93.5

Pension And Other Retiree Benef

Pension And Other Retiree Benefits	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Pension And Other Retiree Benefits	6. Pension and Other Retiree Benefits The components of net periodic benefit (income) cost for pension and post-retirement plans for the three months ended March 31, 2021 and 2020 were as follows: Three Months Ended March 31, Pension Post-retirement U.S. International (in millions) 2021 2020 2021 2020 2021 2020 Service cost $ 0.4 $ 0.4 $ 0.4 $ 0.4 $ — $ — Interest cost 1.0 1.5 1.6 2.4 — — Expected return on plan assets (2.8) (2.9) (4.8) (4.7) — — Amortization of net loss (gain) 1.0 0.8 1.8 1.2 (0.1) (0.1) Amortization of prior service cost 0.1 0.1 0.1 0.1 — — Curtailment loss (1) 1.4 — — — — — Net periodic benefit cost (income) (2) $ 1.1 $ (0.1) $ (0.9) $ (0.6) $ (0.1) $ (0.1) (1) Curtailment loss of $1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan. (2) The components, other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Operations. We expect to contribute approximately $24.5 million to our defined benefit plans in 2021. For the three months ended March 31, 2021, we have contributed $6.6 million to these plans.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	7. Stock-Based Compensation The following table summarizes our stock-based compensation expense (including stock options, restricted stock units ("RSUs") and performance stock units ("PSUs")) for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, (in millions) 2021 2020 Stock option compensation expense $ 1.7 $ 0.8 RSU compensation expense 2.5 1.0 PSU compensation expense 0.6 (0.9) Total stock-based compensation expense $ 4.8 $ 0.9 We generally recognize compensation expense for stock-based awards ratably over the vesting period. During the first quarter of 2021, the Compensation Committee of the Company's Board of Directors approved stock compensation grants which consisted of 1,526,654 stock options, 254,460 RSUs and 1,652,526 PSUs. The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of March 31, 2021: March 31, 2021 Unrecognized Weighted Average Compensation Years Expense To Be (in millions, except weighted average years) Expense Recognized Over Stock options $5.2 2.4 RSUs $5.2 2.1 PSUs $15.0 2.4

Inventories

Inventories	3 Months Ended
	Mar. 31, 2021
Inventory Disclosure [Abstract]
Inventories	8. Inventories The components of inventories were as follows: (in millions) March 31, December 31, Raw materials $ 40.2 $ 36.8 Work in process 3.9 3.5 Finished goods 307.1 264.8 Total inventories $ 351.2 $ 305.1

Goodwill And Identifiable Intan

Goodwill And Identifiable Intangibles	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Identifiable Intangibles	9. Goodwill and Identifiable Intangible Assets Goodwill We test goodwill for impairment at least annually, during the second quarter, and on an interim basis if an event or circumstance indicates that there is a triggering event that would make it more likely than not that an impairment loss had been incurred. During the second quarter ended June 30, 2020, we performed a qualitative assessment of impairment for goodwill for each of our three reporting units. We considered events and circumstances that may affect the fair value of each reporting unit to determine whether it is necessary to perform the quantitative impairment test. We focused on events or circumstances that could affect the significant inputs, including, but not limited to, financial performance, such as negative or declining cash flows, a decline in actual or planned revenue or earnings compared with actual and projected results of relevant prior periods, competitive, economic, industry and market considerations, and other factors that have or could impact each of our reporting units. If we determine that it is more likely than not that the goodwill is impaired, then we would perform a quantitative impairment test. The result of our qualitative assessment performed during the second quarter ended June 30, 2020, was that there were no triggering events that would make it more likely than not that an impairment loss to our goodwill has been incurred for any of our three reporting units. Changes in the net carrying amount of goodwill by segment were as follows: (in millions) ACCO ACCO ACCO Total Balance at December 31, 2020 $ 461.2 $ 188.2 $ 178.0 $ 827.4 PowerA working capital adjustment (18.2) — — (18.2) Foreign currency translation — (8.4) (1.1) (9.5) Balance at March 31, 2021 $ 443.0 $ 179.8 $ 176.9 $ 799.7 The goodwill balance includes $215.1 million of accumulated impairment losses, which occurred prior to December 31, 2016. Identifiable Intangible Assets PowerA Acquisition The preliminary valuation of identifiable intangible assets of $239.7 million acquired in the PowerA Acquisition includes amortizable customer relationships, vendor relationships, trade names and developed technology, which have been recorded at their estimated fair values. The fair value of the customer relationships was determined using the multi-period excess earnings method which is based on the present value of the projected after-tax cash flows. The fair value of the vendor relationships was determined using the lost income method. The fair value of the trade name and the developed technology was determined using the relief from royalty method, which is based on the present value of royalty fees derived from projected revenues. The determination of the acquisition date fair value of the intangible assets required the Company to make significant estimates and assumptions regarding future revenue growth rates, future cost of sales, operating expenses and earnings before income tax, attrition rate, future cash flows without vendor relationships and discount rates. The amortizable trade name, customer and vendor relationships will be amortized over 15 years while the developed technology will be amortized over 5 years on a straight-line basis. The allocation of the identifiable intangibles acquired in the PowerA Acquisition was as follows: (in millions) Fair Value Remaining Useful Life Trade name $ 21.6 15 years Customer relationships 127.6 15 years Vendor relationships 87.7 15 years Developed technology 2.8 5 years Total identifiable intangibles acquired $ 239.7 Intangible Assets The gross carrying value and accumulated amortization by class of identifiable intangible assets as of March 31, 2021 and December 31, 2020, were as follows: March 31, 2021 December 31, 2020 (in millions) Gross Accumulated Net Gross Accumulated Net Indefinite-lived intangible assets: Trade names $ 457.3 $ (44.5) (1) $ 412.8 $ 467.5 $ (44.5) (1) $ 423.0 Amortizable intangible assets: Trade names 339.3 (100.5) 238.8 343.5 (97.7) 245.8 Customer and contractual relationships 370.8 (167.0) 203.8 376.8 (162.9) 213.9 Vendor relationships 87.7 (1.7) 86.0 87.7 (0.2) 87.5 Patents 8.7 (2.2) 6.5 8.9 (2.1) 6.8 Subtotal 806.5 (271.4) 535.1 816.9 (262.9) 554.0 Total identifiable intangibles $ 1,263.8 $ (315.9) $ 947.9 $ 1,284.4 $ (307.4) $ 977.0 (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 $12.0 million and $8.4 million for the three months ended March 31, 2021 and 2020, respectively. Estimated amortization expense for amortizable intangible assets, as of March 31, 2021, for the current year and the next five years is as follows: (in millions) 2021 2022 2023 2024 2025 2026 Estimated amortization expense (2) $ 46.3 $ 42.6 $ 40.2 $ 38.5 $ 36.8 $ 34.5 (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 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, as allowed by GAAP, for our indefinite-lived trade names in the second quarter of 2020 and concluded that no impairment existed. COVID-19 Impact We continue to monitor the significant global impact and uncertainty as a result of COVID-19 to assess the outlook for demand for our products and the effect on our business and our overall financial performance. This includes our risk of impairment of our goodwill and indefinite-lived intangible assets. Although the full impact of COVID-19 on demand remains uncertain, with impact varying significantly by geographic region, we remain committed to taking the actions necessary to protect our long-term financial performance expectations and position the Company for long-term growth. We have seen improving sales trends in our North America and EMEA segments during the first quarter, but the situation in Brazil, Mexico and the rest of Latin America remains extremely challenging. We expect the macroeconomic environment will recover in the medium to long-term, but progress may be uneven and sporadic. As a result of our analysis, and consideration of events and circumstances, we concluded based on the previously conducted annual assessment, on a qualitative basis, no impairment of our goodwill or indefinite-lived intangible assets was triggered as of June 30, 2020. The implied fair values of all three of our reporting units, more likely than not, exceed their carrying values at March 31, 2021. We have not identified a triggering event that would cause us to perform a quantitative goodwill impairment analysis. In management’s opinion, the goodwill balance for our ACCO Brands International reporting unit could be at risk for impairment if operating performance does not recover as expected from the current impacts of COVID-19, if we experience negative changes to the long-term outlook for the business, or if there are changes in factors and assumptions which impact the fair value of our reporting units, such as low or declining revenue growth rates, depressed operating margins or adverse changes to the discount rates impacting this reporting unit.

Restructuring

Restructuring	3 Months Ended
	Mar. 31, 2021
Restructuring and Related Activities [Abstract]
Restructuring	10. Restructuring The Company recorded $3.9 million and $0.3 million of restructuring expense for the three months ended March 31, 2021 and 2020, respectively. The restructuring expenses were primarily for severance costs and termination of lease agreements related to cost reduction initiatives in our North America and International segments. The summary of the activity in the restructuring liability for the three months ended March 31, 2021, was as follows: (in millions) Balance at December 31, 2020 Provision Cash Non-cash Balance at March 31, 2021 Employee termination costs (1) $ 8.1 $ 3.1 $ (2.7) $ (0.1) $ 8.4 Termination of lease agreements (2) 1.0 0.8 (0.1) — 1.7 Other (3) 0.2 — — — 0.2 Total restructuring liability $ 9.3 $ 3.9 $ (2.8) $ (0.1) $ 10.3 (1) We expect the remaining $8.4 million employee termination costs to be substantially paid in the next twelve months. (2) We expect the remaining $1.7 million lease termination costs to be substantially paid in the next twelve months. (3) We expect the remaining $0.2 million of other costs to be substantially paid in the next nine months. The summary of the activity in the restructuring liability for the three months ended March 31, 2020, was as follows: (in millions) Balance at December 31, 2019 Provision Cash Non-cash Balance at March 31, 2020 Employee termination costs $ 10.7 $ 0.3 $ (2.0) $ (0.4) $ 8.6 Termination of lease agreements 0.6 — (0.5) — 0.1 Other 0.5 — (0.1) — 0.4 Total restructuring liability $ 11.8 $ 0.3 $ (2.6) $ (0.4) $ 9.1

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	11. Income Taxes For the three months ended March 31, 2021, we recorded an income tax benefit of $5.9 million on a loss before taxes of $26.3 million, for an effective rate of 22.4 percent . The decrease in the effective rate versus the three months ended March 31, 2020 was primarily driven by the loss of $26.3 million in the current quarter versus income of $11.1 million in the prior year. For the three months ended March 31, 2020, we recorded an income tax expense of $3.1 million on income before taxes of $11.1 million , for an effective rate of 27.9 percent . The U.S. federal statute of limitations remains open for the years 2017 and forward. Foreign and U.S. state jurisdictions have statutes of limitations generally ranging from 2 to 5 years. Years still open to examination by foreign tax authorities in major jurisdictions include Australia (2016 forward), Brazil (2015 forward), Canada (2016 forward), Germany (2015 forward), Sweden (2015 forward) and the U.K. (2018 forward). We are currently under examination in certain foreign jurisdictions. 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 Tilibra Produtos de Papelaria Ltda. ("Tilibra"). In December of 2012, the Federal Revenue Department of the Ministry of Finance of Brazil ("FRD") issued a tax assessment against Tilibra, challenging the tax deduction of goodwill from Tilibra's taxable income for the year 2007 (the "First Assessment"). A second assessment challenging the deduction of goodwill from Tilibra'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"). Tilibra is disputing both of the Brazil Tax Assessments. The final administrative appeal of the Second Assessment was decided against the Company in 2017. In 2018, we appealed this decision to the 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. We appealed this decision to the judicial level. We recorded an additional expense in the third quarter of 2020 of $1.2 million representing additional attorneys' costs and fees, which we will be required to pay if we do not prevail at the judicial level. 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 tax appeal process is complete, which is expected to take a number of 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 these disputes 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. Included in this reserve is an assumption of penalties at 75 percent, which is the standard penalty. While there is a possibility that a penalty of 150 percent could be imposed in connection with the First Assessment, based on the facts in our case and existing precedent, we believe the likelihood of a 150 percent penalty is not more likely than not as of March 31, 2021. 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. The time limit for issuing an assessment for 2011 and 2012 expired in January 2018 and January 2019, respectively. Since we did not receive an assessment for either of these periods, we reversed the amounts previously accrued, including $5.6 million related to 2011, which was reversed in the first quarter of 2018. During the three months ended March 31, 2021 and 2020, we accrued additional interest as a charge to current income tax expense of $0.1 million in each period. At current exchange rates, our accrual through March 31, 2021, including tax, penalties and interest is $25.7 million (reported in "Other non-current liabilities").

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	12. Earnings per Share Total outstanding shares as of March 31, 2021 and 2020, were 95.5 million and 94.4 million, respectively. Under our stock repurchase program, for the three months ended March 31, 2021 no shares were repurchased and for the three months ended March 31, 2020, we repurchased and retired 2.7 million shares. For the three months ended March 31, 2021 and 2020, we acquired 0.1 million and 0.2 million shares, respectively, related to tax withholding for share-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. The number of our weighted-average shares outstanding for the three months ended March 31, 2021 and 2020 was as follows: Three Months Ended March 31, (in millions) 2021 2020 Weighted-average number of shares of common stock outstanding - basic 95.1 96.0 Stock options — 0.2 Restricted stock units — 1.3 Weighted-average shares and assumed conversions - diluted (1) 95.1 97.5 (1) Due to the net loss during the three months ended March 31, 2021, 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 exercise price, as it would result in a less dilutive computation. As a result, reported diluted earnings per share for the three months ended March 31, 2021 are the same as basic earnings per share.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2021
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. The majority of the Company’s exposure to local currency movements is in Europe (the Euro, the Swedish krona and the British pound), Brazil, Australia, Canada, and Mexico. 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 Accumulated Other Comprehensive Income ("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 Operations." As of March 31, 2021 and December 31, 2020, we had cash flow foreign exchange contracts outstanding with a U.S. dollar equivalent notional value of $153.2 million and $134.3 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 Operations" 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 March 2022. As of March 31, 2021 and December 31, 2020, we had foreign exchange contracts outstanding with a U.S. dollar equivalent notional value of $130.7 million and $164.7 million, respectively, which were not designated as hedges. The following table summarizes the fair value of our derivative financial instruments as of March 31, 2021 and December 31, 2020: Fair Value of Derivative Instruments Derivative Assets Derivative Liabilities (in millions) Balance Sheet March 31, 2021 December 31, Balance Sheet March 31, 2021 December 31, Derivatives designated as hedging instruments: Foreign exchange contracts Other current assets $ 2.7 $ 0.1 Other current liabilities $ 1.4 $ 5.0 Derivatives not designated as hedging instruments: Foreign exchange contracts Other current assets 0.7 1.6 Other current liabilities 2.1 1.2 Foreign exchange contracts Other non-current assets 19.0 32.1 Other non-current liabilities 19.0 32.1 Total derivatives $ 22.4 $ 33.8 $ 22.5 $ 38.3 The following tables summarize the pre-tax effect of our derivative financial instruments on the condensed consolidated financial statements for the three months ended March 31, 2021 and 2020: 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 Three Months Ended March 31, Three Months Ended March 31, (in millions) 2021 2020 2021 2020 Cash flow hedges: Foreign exchange contracts $ 4.4 $ 4.5 Cost of products sold $ 1.5 $ (1.2) The Effect of Derivatives Not Designated as Hedging Instruments on the Consolidated Statements of Operations Location of (Gain) Loss Recognized in Amount of (Gain) Loss Three Months Ended March 31, (in millions) 2021 2020 Foreign exchange contracts Other expense (income), net $ 1.2 $ (9.3)

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	3 Months Ended
	Mar. 31, 2021
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 March 31, 2021 and December 31, 2020: (in millions) March 31, December 31, Assets: Forward currency contracts $ 22.4 $ 33.8 Liabilities: Forward currency contracts $ 22.5 $ 38.3 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 $1,214.5 million and $1,136.6 million and the estimated fair value of total debt was $1,180.0 million and $1,146.9 million at March 31, 2021 and December 31, 2020, respectively. The fair values are determined from quoted market prices, where available, and from investment bankers using current interest rates considering credit ratings and the remaining time to maturity. Contingent consideration: The PowerA Acquisition included an additional earnout of up to $55.0 million in cash, contingent upon PowerA achieving one- and two- year sales and profit growth objectives. Liabilities for contingent consideration are measured at fair value each reporting period, with the acquisition-date fair value included as part of the consideration transferred in the related business combination and subsequent changes in fair value recorded in operating income on the condensed consolidated statements of income. We use a Monte Carlo simulation model for contingent earnout payments, which are then discounted to present value. We classify the contingent consideration liabilities as Level 3 due to the lack of relevant observable market data over fair value inputs such as probability-weighting of payment outcomes. There have been no transfers of assets or liabilities into or out of Level 3 of the fair value hierarchy. The following table provides a reconciliation of the beginning and ending balance of the contingent consideration for the three months ended March 31, 2021: (in millions) Contingent Consideration Balance at December 31, 2020 $ 18.2 Change in fair value 6.7 Balance at March 31, 2021 $ 24.9

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	15. Accumulated Other Comprehensive Income (Loss) AOCI is defined as net income (loss) 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, 2020 $ (3.1) $ (318.8) $ (242.3) $ (564.2) Other comprehensive income (loss) before reclassifications, net of tax 3.0 (20.7) 0.3 (17.4) Amounts reclassified from accumulated other comprehensive income (loss), net of tax 1.1 — 3.3 4.4 Balance at March 31, 2021 $ 1.0 $ (339.5) $ (238.7) $ (577.2) The reclassifications out of AOCI for the three months ended March 31, 2021 and 2020 were as follows: Three Months Ended March 31, 2021 2020 (in millions) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Location on Income Statement Details about Accumulated Other Comprehensive Income (Loss) Components Gain (loss) on cash flow hedges: Foreign exchange contracts $ (1.5) $ 1.2 Cost of products sold Tax benefit (expense) 0.4 (0.3) Income tax (benefit) expense Net of tax $ (1.1) $ 0.9 Defined benefit plan items: Amortization of actuarial loss $ (2.7) $ (1.9) (1) Amortization of prior service cost (1.6) (0.2) (1) Total before tax (4.3) (2.1) Tax benefit 1.0 0.5 Income tax (benefit) expense Net of tax $ (3.3) $ (1.6) Total reclassifications for the period, net of tax $ (4.4) $ (0.7)

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2021
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 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. 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, 2020, there was $3.0 million of unearned revenue associated with outstanding EMAs, primarily reported in "Other current liabilities." During the three months ended March 31, 2021, $1.1 million of the unearned revenue was earned and recognized. As of March 31, 2021, the amount of unearned revenue from EMAs was $2.8 million. We expect to earn and recognize approximately $2.1 million of the unearned amount in the next 12 months and $0.7 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 and our net sales disaggregated by the timing of revenue recognition for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, (in millions) 2021 2020 United States $ 170.3 $ 147.4 Canada 18.5 20.4 ACCO Brands North America 188.8 167.8 ACCO Brands EMEA (2) 156.9 127.5 Australia/N.Z. 32.1 28.9 Latin America 19.5 49.0 Asia-Pacific 13.2 10.9 ACCO Brands International 64.8 88.8 Net sales $ 410.5 $ 384.1 (1) Net sales are attributed to geographic areas based on the location of the selling subsidiaries. (2) ACCO Brands EMEA is comprised largely of Europe, but also includes export sales to the Middle East and Africa. Three Months Ended March 31, (in millions) 2021 2020 Product and services transferred at a point in time $ 395.7 $ 363.6 Product and services transferred over time 14.8 20.5 Net sales $ 410.5 $ 384.1

Information On Business Segment

Information On Business Segments	3 Months Ended
	Mar. 31, 2021
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 segments are as follows: Operating Segment Geography Primary Brands Primary Products ACCO Brands North America United States and Canada PowerA ® , Five Star ® , Kensington ® , AT-A-GLANCE ® , Quartet ® , Swingline ® , GBC ® , Mead ® , Hilroy ® Gaming and computer accessories, school products, planners, storage and organization (3-ring binders), dry erase boards, laminating, binding, stapling and punching products ACCO Brands EMEA Europe, Middle East and Africa Leitz ® , Rapid ® , Esselte ® , Kensington ® , Rexel ® GBC ® , PowerA ® , NOBO ® , Derwent ® Storage and organization products (lever-arch binders, sheet protectors, indexes), computer and gaming accessories, laminating, shredding, stapling, punching, do-it-yourself tools, dry erase boards and writing instruments ACCO Brands International Australia/N.Z., Latin America and Asia-Pacific Tilibra ® , Foroni ® , GBC ® , Barrilito ® , Marbig ® , Kensington ® , Artline ® *, PowerA ® , Spirax ® , Quartet ® , Wilson Jones ® , Rexel ® *Australia/N.Z. only School notebooks, laminating, shredding, storage and organization products (binders, sheet protectors and indexes), 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 other end-user products used in businesses, schools, and homes. 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; laminating, shredding, and binding machines; calendars; stapling; punching; dry erase boards; and do-it-yourself tools, among others. Our portfolio includes both globally and regionally recognized brands. Customers We distribute our products through a wide variety of retail and commercial 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 to commercial and consumer end-users through e-commerce sites and our direct sales organization. Net sales by reportable business segment for the three months ended March 31, 2021 and 2020 were as follows: Three Months Ended March 31, (in millions) 2021 2020 ACCO Brands North America $ 188.8 $ 167.8 ACCO Brands EMEA 156.9 127.5 ACCO Brands International 64.8 88.8 Net sales $ 410.5 $ 384.1 Operating income (loss) by business segment for the three months ended March 31, 2021 and 2020 was as follows: Three Months Ended March 31, (in millions) 2021 2020 ACCO Brands North America $ (0.7) $ 7.6 ACCO Brands EMEA 16.8 12.0 ACCO Brands International 0.6 5.9 Segment operating income 16.7 25.5 Change in fair value of contingent consideration (6.7) — Corporate (11.1) (8.1) Operating (loss) income (1) (1.1) 17.4 Interest expense 13.2 8.6 Interest income (0.1) (0.3) Non-operating pension income (0.8) (1.5) Other expense (income), net 12.9 (0.5) (Loss) income before income tax $ (26.3) $ 11.1 (1) Operating income (loss) as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less selling, general and administrative expenses; iv) less amortization of intangibles; v) less restructuring charges; and vi) less change in the fair value of contingent consideration.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2021
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 Tilibra. For further information, see "Note 11. Income Taxes - Brazil Tax Assessments " for details on tax assessments issued by the FRD against Tilibra challenging the tax deduction of goodwill from Tilibra'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 March 2017, the Supreme Court of Brazil ruled against the Brazilian tax authority in a leading case related to the computation of certain indirect taxes. The Supreme Court ruled that the indirect tax base should not include a value-added tax known as "ICMS." The Supreme Court decision, in principle, affects all applicable judicial proceedings in progress, and reduces future indirect taxes on our Brazilian subsidiary, Tilibra. However, the Brazilian tax authority has filed an appeal seeking clarification of certain matters, including the amount by which taxpayers would be entitled to reduce their indirect tax base (i.e. the gross ICMS collected or the net ICMS paid). The appeal also requests a modulation of the decision’s effects, which may limit its retrospective impact on taxpayers, including Tilibra. Tilibra has paid and continues to pay these indirect taxes on a tax base which includes the gross ICMS collected. It has also filed legal actions in Brazil to request reimbursement of these excess tax payments by way of future credits ("Tax Credits") and for permission to exclude the gross ICMS collected from the tax base in future periods. Tilibra’s legal actions cover various time periods and some have been finally decided in a court of law in favor of Tilibra, while others are still pending a final decision. Due to the uncertainties associated with the scope of the application of the Brazilian Supreme Court’s ruling, taking into account the Brazilian tax authority’s appeal and request for modulation, the Company has and will recognize income only for the amount of Tax Credits actually monetized, which will occur when Tilibra receives a cash flow benefit from applying the Tax Credits against various taxes payable in Brazil. The benefit of the Tax Credits realized by the Company has and will be recorded in the Consolidated Statements of Operations in the line item "Other expense (income), net." Tilibra received final decisions for Tax Credits in the amount of $4.3 million, of which $3.3 million was offset against Brazilian taxes in the fourth quarter of 2019, with the balance used during the first quarter of 2020. This amount of Tax Credits assumes that only the net amount of ICMS paid can be excluded from the tax base. The total value of these Tax Credits was recorded as a gain in Tilibra’s local statutory accounts during the third quarter of 2019, resulting in Brazilian federal taxes payable of approximately $1.6 million. Final decisions in the remaining legal actions Tilibra has filed may result in additional Tax Credits that could be monetized in future periods. Further, a favorable decision in the leading case by the Brazilian Supreme Court on the methodology to compute the Tax Credits (i.e. gross ICMS collected) would result in additional Tax Credits being available to Tilibra. The amount of these additional Tax Credits may be material. Foroni, in years prior to the acquisition, also filed legal actions in Brazil to recover these excess indirect tax payments; however, all of Foroni's claims are still pending a final decision. In the event any Tax Credits are recovered on behalf of Foroni, we are required under the quota purchase agreement to remit such recovery to the former owners of Foroni on a net income tax paid basis, and therefore will not recognize any benefit in the Consolidated Statements of Operations. 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.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Events The Company completed the acquisition of Franken Planungs- und Organisationsmittel GmbH (“Franken”) on April 1, 2021, for approximately $4.0 million. Franken is a provider of visual communication products, boards, planning, creative and training products. Franken is a German company that will be included in the Company’s EMEA reporting unit.

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Purchase Price Allocation to the Fair Value of Assets Acquired and Liabilities Assumed	The following table presents the preliminary allocation of the consideration given to the fair values of the assets acquired and liabilities assumed at the date of the PowerA Acquisition: (in millions) At December 17, 2020 Calculation of Goodwill: Purchase price, net of working capital adjustment $ 321.8 Fair value of contingent consideration $ 18.2 Plus fair value of liabilities assumed: Accrued liabilities 9.2 Fair value of liabilities assumed $ 9.2 Less fair value of assets acquired: Inventory 28.7 Property and equipment 0.2 Identifiable intangibles 239.7 Other assets 13.2 Fair value of assets acquired $ 281.8 Goodwill $ 67.4
Business Acquisition, Pro Forma Information	Had the PowerA Acquisition occurred on January 1, 2019, unaudited pro forma consolidated results of the Company for the three months ended March 31, 2021 and 2020 w ould have been as follows: (in millions) 2021 2020 Net sales $ 410.5 $ 414.6 Net (loss) income (20.4) 8.0 Net (loss) income per common share (diluted) $ (0.21) $ 0.08

Long-Term Debt And Short-Term_2

Long-Term Debt And Short-Term Borrowings (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
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 March 31, 2021 and December 31, 2020: (in millions) March 31, December 31, Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.25% at March 31, 2021) $ 273.9 $ — Euro Senior Secured Term Loan A, due May 2024 (floating interest rate of 2.50% at December 31, 2020) — 287.4 USD Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.45% at March 31, 2021) 92.5 — USD Senior Secured Term Loan A, due May 2024 (floating interest rate of 3.50% at December 31, 2020) — 92.5 Australian Dollar Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.31% at March 31, 2021) 42.8 — Australian Dollar Senior Secured Term Loan A, due May 2024 (floating interest rate of 2.57% at December 31, 2020) — 43.4 U.S. Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 2.47% at March 31, 2021) 173.3 — U.S. Dollar Senior Secured Revolving Credit Facility, due May 2024 (floating interest rate of 3.50% at December 31, 2020) — 307.2 Australian Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 2.31% at March 31, 2021) 45.6 — Australian Dollar Senior Secured Revolving Credit Facility, due May 2024 (floating interest rate of 2.57% at December 31, 2020) — 25.4 Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25%) 575.0 — Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%) — 375.0 Other borrowings 11.4 5.7 Total debt 1,214.5 1,136.6 Less: Current portion 48.2 76.5 Debt issuance costs, unamortized 10.4 5.5 Long-term debt, net $ 1,155.9 $ 1,054.6
Schedule Of Maximum Consolidated Leverage Ratio	further amend the maximum Consolidated Leverage Ratio financial covenant by 0.50:1.00 from current levels for each of the six fiscal quarters beginning March 31, 2021 and ending June 30, 2022, as follows: Quarter Ended Maximum Consolidated Leverage Ratio March 2021 5.25:1.00 June 2021 5.25:1.00 September 2021 4.75:1.00 December 2021 4.25:1.00 March 2022 4.25:1.00 June 2022 4.25:1.00 September 2022 and thereafter 3.75:1.00
Schedule of Applicable Rate and Undrawn Fee Based on the Company's Consolidated Leverage Ratio [Table Text Block]	reflect more favorable pricing at higher Consolidated Leverage Ratio levels along with lower fees on undrawn amounts, 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)	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Components of Lease Expense and Other Information	The components of lease expense were as follows: Three Months Ended March 31, (in millions) 2021 2020 Operating lease cost $ 7.2 $ 7.3 Sublease income (0.3) (0.4) Total lease cost $ 6.9 $ 6.9 Other information related to leases was as follows: Three Months Ended March 31, (in millions, except lease term and discount rate) 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 7.2 $ 7.3 Right-of-use assets obtained in exchange for lease obligations: Operating leases 4.2 1.0 As of March 31, 2021 Weighted average remaining lease term: Operating leases 6.3 years Weighted average discount rate: Operating leases 5.3 %
Future Minimum Lease Payments	Future minimum lease payments, net of sub-lease income, for all non-cancelable leases as of March 31, 2021, were as follows: (in millions) 2021 $ 20.1 2022 20.7 2023 16.1 2024 13.3 2025 9.9 2026 8.3 Thereafter 24.2 Total minimum lease payments 112.6 Less imputed interest 19.1 Future minimum payments for leases, net of sublease rental income and imputed interest $ 93.5

Pension And Other Retiree Ben_2

Pension And Other Retiree Benefits (Tables)	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Components of Net Periodic Benefit Cost for Pension and Post-Retirement Plans	The components of net periodic benefit (income) cost for pension and post-retirement plans for the three months ended March 31, 2021 and 2020 were as follows: Three Months Ended March 31, Pension Post-retirement U.S. International (in millions) 2021 2020 2021 2020 2021 2020 Service cost $ 0.4 $ 0.4 $ 0.4 $ 0.4 $ — $ — Interest cost 1.0 1.5 1.6 2.4 — — Expected return on plan assets (2.8) (2.9) (4.8) (4.7) — — Amortization of net loss (gain) 1.0 0.8 1.8 1.2 (0.1) (0.1) Amortization of prior service cost 0.1 0.1 0.1 0.1 — — Curtailment loss (1) 1.4 — — — — — Net periodic benefit cost (income) (2) $ 1.1 $ (0.1) $ (0.9) $ (0.6) $ (0.1) $ (0.1) (1) Curtailment loss of $1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan. (2) The components, other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Operations.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	The following table summarizes our stock-based compensation expense (including stock options, restricted stock units ("RSUs") and performance stock units ("PSUs")) for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, (in millions) 2021 2020 Stock option compensation expense $ 1.7 $ 0.8 RSU compensation expense 2.5 1.0 PSU compensation expense 0.6 (0.9) Total stock-based compensation expense $ 4.8 $ 0.9
Schedule of Unrecognized Compensation Cost, Nonvested Awards	The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of March 31, 2021: March 31, 2021 Unrecognized Weighted Average Compensation Years Expense To Be (in millions, except weighted average years) Expense Recognized Over Stock options $5.2 2.4 RSUs $5.2 2.1 PSUs $15.0 2.4

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2021
Inventory Disclosure [Abstract]
Components of Inventory	The components of inventories were as follows: (in millions) March 31, December 31, Raw materials $ 40.2 $ 36.8 Work in process 3.9 3.5 Finished goods 307.1 264.8 Total inventories $ 351.2 $ 305.1

Goodwill And Identifiable Int_2

Goodwill And Identifiable Intangibles (Tables)	3 Months Ended
	Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]
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 ACCO ACCO Total Balance at December 31, 2020 $ 461.2 $ 188.2 $ 178.0 $ 827.4 PowerA working capital adjustment (18.2) — — (18.2) Foreign currency translation — (8.4) (1.1) (9.5) Balance at March 31, 2021 $ 443.0 $ 179.8 $ 176.9 $ 799.7
Gross Carrying Value and Accumulated Amortization by Class of Identifiable Intangible Assets	The gross carrying value and accumulated amortization by class of identifiable intangible assets as of March 31, 2021 and December 31, 2020, were as follows: March 31, 2021 December 31, 2020 (in millions) Gross Accumulated Net Gross Accumulated Net Indefinite-lived intangible assets: Trade names $ 457.3 $ (44.5) (1) $ 412.8 $ 467.5 $ (44.5) (1) $ 423.0 Amortizable intangible assets: Trade names 339.3 (100.5) 238.8 343.5 (97.7) 245.8 Customer and contractual relationships 370.8 (167.0) 203.8 376.8 (162.9) 213.9 Vendor relationships 87.7 (1.7) 86.0 87.7 (0.2) 87.5 Patents 8.7 (2.2) 6.5 8.9 (2.1) 6.8 Subtotal 806.5 (271.4) 535.1 816.9 (262.9) 554.0 Total identifiable intangibles $ 1,263.8 $ (315.9) $ 947.9 $ 1,284.4 $ (307.4) $ 977.0 (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, as of March 31, 2021, for the current year and the next five years is as follows: (in millions) 2021 2022 2023 2024 2025 2026 Estimated amortization expense (2) $ 46.3 $ 42.6 $ 40.2 $ 38.5 $ 36.8 $ 34.5 (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.
PowerA
Finite-Lived Intangible Assets [Line Items]
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	The allocation of the identifiable intangibles acquired in the PowerA Acquisition was as follows: (in millions) Fair Value Remaining Useful Life Trade name $ 21.6 15 years Customer relationships 127.6 15 years Vendor relationships 87.7 15 years Developed technology 2.8 5 years Total identifiable intangibles acquired $ 239.7

Restructuring (Tables)

Restructuring (Tables)	3 Months Ended
	Mar. 31, 2021
Restructuring and Related Activities [Abstract]
Summary of Activity in Restructuring Accounts	The summary of the activity in the restructuring liability for the three months ended March 31, 2021, was as follows: (in millions) Balance at December 31, 2020 Provision Cash Non-cash Balance at March 31, 2021 Employee termination costs (1) $ 8.1 $ 3.1 $ (2.7) $ (0.1) $ 8.4 Termination of lease agreements (2) 1.0 0.8 (0.1) — 1.7 Other (3) 0.2 — — — 0.2 Total restructuring liability $ 9.3 $ 3.9 $ (2.8) $ (0.1) $ 10.3 (1) We expect the remaining $8.4 million employee termination costs to be substantially paid in the next twelve months. (2) We expect the remaining $1.7 million lease termination costs to be substantially paid in the next twelve months. (3) We expect the remaining $0.2 million of other costs to be substantially paid in the next nine months. The summary of the activity in the restructuring liability for the three months ended March 31, 2020, was as follows: (in millions) Balance at December 31, 2019 Provision Cash Non-cash Balance at March 31, 2020 Employee termination costs $ 10.7 $ 0.3 $ (2.0) $ (0.4) $ 8.6 Termination of lease agreements 0.6 — (0.5) — 0.1 Other 0.5 — (0.1) — 0.4 Total restructuring liability $ 11.8 $ 0.3 $ (2.6) $ (0.4) $ 9.1

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	our weighted-average shares outstanding for the three months ended March 31, 2021 and 2020 was as follows: Three Months Ended March 31, (in millions) 2021 2020 Weighted-average number of shares of common stock outstanding - basic 95.1 96.0 Stock options — 0.2 Restricted stock units — 1.3 Weighted-average shares and assumed conversions - diluted (1) 95.1 97.5

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2021
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 March 31, 2021 and December 31, 2020: Fair Value of Derivative Instruments Derivative Assets Derivative Liabilities (in millions) Balance Sheet March 31, 2021 December 31, Balance Sheet March 31, 2021 December 31, Derivatives designated as hedging instruments: Foreign exchange contracts Other current assets $ 2.7 $ 0.1 Other current liabilities $ 1.4 $ 5.0 Derivatives not designated as hedging instruments: Foreign exchange contracts Other current assets 0.7 1.6 Other current liabilities 2.1 1.2 Foreign exchange contracts Other non-current assets 19.0 32.1 Other non-current liabilities 19.0 32.1 Total derivatives $ 22.4 $ 33.8 $ 22.5 $ 38.3
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	The following tables summarize the pre-tax effect of our derivative financial instruments on the condensed consolidated financial statements for the three months ended March 31, 2021 and 2020: 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 Three Months Ended March 31, Three Months Ended March 31, (in millions) 2021 2020 2021 2020 Cash flow hedges: Foreign exchange contracts $ 4.4 $ 4.5 Cost of products sold $ 1.5 $ (1.2) The Effect of Derivatives Not Designated as Hedging Instruments on the Consolidated Statements of Operations Location of (Gain) Loss Recognized in Amount of (Gain) Loss Three Months Ended March 31, (in millions) 2021 2020 Foreign exchange contracts Other expense (income), net $ 1.2 $ (9.3)

Fair Value Of Financial Instr_2

Fair Value Of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2021
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 March 31, 2021 and December 31, 2020: (in millions) March 31, December 31, Assets: Forward currency contracts $ 22.4 $ 33.8 Liabilities: Forward currency contracts $ 22.5 $ 38.3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The following table provides a reconciliation of the beginning and ending balance of the contingent consideration for the three months ended March 31, 2021: (in millions) Contingent Consideration Balance at December 31, 2020 $ 18.2 Change in fair value 6.7 Balance at March 31, 2021 $ 24.9

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2020 $ (3.1) $ (318.8) $ (242.3) $ (564.2) Other comprehensive income (loss) before reclassifications, net of tax 3.0 (20.7) 0.3 (17.4) Amounts reclassified from accumulated other comprehensive income (loss), net of tax 1.1 — 3.3 4.4 Balance at March 31, 2021 $ 1.0 $ (339.5) $ (238.7) $ (577.2)
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)	The reclassifications out of AOCI for the three months ended March 31, 2021 and 2020 were as follows: Three Months Ended March 31, 2021 2020 (in millions) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Location on Income Statement Details about Accumulated Other Comprehensive Income (Loss) Components Gain (loss) on cash flow hedges: Foreign exchange contracts $ (1.5) $ 1.2 Cost of products sold Tax benefit (expense) 0.4 (0.3) Income tax (benefit) expense Net of tax $ (1.1) $ 0.9 Defined benefit plan items: Amortization of actuarial loss $ (2.7) $ (1.9) (1) Amortization of prior service cost (1.6) (0.2) (1) Total before tax (4.3) (2.1) Tax benefit 1.0 0.5 Income tax (benefit) expense Net of tax $ (3.3) $ (1.6) Total reclassifications for the period, net of tax $ (4.4) $ (0.7)

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2021
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 and our net sales disaggregated by the timing of revenue recognition for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, (in millions) 2021 2020 United States $ 170.3 $ 147.4 Canada 18.5 20.4 ACCO Brands North America 188.8 167.8 ACCO Brands EMEA (2) 156.9 127.5 Australia/N.Z. 32.1 28.9 Latin America 19.5 49.0 Asia-Pacific 13.2 10.9 ACCO Brands International 64.8 88.8 Net sales $ 410.5 $ 384.1 (1) Net sales are attributed to geographic areas based on the location of the selling subsidiaries. (2) ACCO Brands EMEA is comprised largely of Europe, but also includes export sales to the Middle East and Africa. Three Months Ended March 31, (in millions) 2021 2020 Product and services transferred at a point in time $ 395.7 $ 363.6 Product and services transferred over time 14.8 20.5 Net sales $ 410.5 $ 384.1

Information On Business Segme_2

Information On Business Segments (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Schedule of Net Sales by Reporting Segments	Net sales by reportable business segment for the three months ended March 31, 2021 and 2020 were as follows: Three Months Ended March 31, (in millions) 2021 2020 ACCO Brands North America $ 188.8 $ 167.8 ACCO Brands EMEA 156.9 127.5 ACCO Brands International 64.8 88.8 Net sales $ 410.5 $ 384.1
Schedule of Operating Income by Reporting Segment	Operating income (loss) by business segment for the three months ended March 31, 2021 and 2020 was as follows: Three Months Ended March 31, (in millions) 2021 2020 ACCO Brands North America $ (0.7) $ 7.6 ACCO Brands EMEA 16.8 12.0 ACCO Brands International 0.6 5.9 Segment operating income 16.7 25.5 Change in fair value of contingent consideration (6.7) — Corporate (11.1) (8.1) Operating (loss) income (1) (1.1) 17.4 Interest expense 13.2 8.6 Interest income (0.1) (0.3) Non-operating pension income (0.8) (1.5) Other expense (income), net 12.9 (0.5) (Loss) income before income tax $ (26.3) $ 11.1 (1) Operating income (loss) as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less selling, general and administrative expenses; iv) less amortization of intangibles; v) less restructuring charges; and vi) less change in the fair value of contingent consideration.

Basis Of Presentation Narrative

Basis Of Presentation Narrative (Details) - PowerA - USD ($) $ in Millions	Dec. 17, 2020	Mar. 31, 2021
Business Acquisition [Line Items]
Payments to Acquire Businesses Gross Less Working Capital Adjustments	$ 321.8
Additional earnout (up to)	$ 55
Additional earnout		$ 24.9

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 17, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Acquired cost	$ 340
Revenues			$ 410.5	$ 384.1
Goodwill	$ 827.4		799.7		$ 827.4
PowerA
Business Acquisition [Line Items]
Payments to Acquire Businesses Gross Less Working Capital Adjustments		$ 321.8
Additional earnout (up to)		55
Additional earnout			24.9
Business Combination, Working Capital Adjustment			18.2
Revenues			62.7
Goodwill		$ 67.4
Selling, General and Administrative Expenses | PowerA
Business Acquisition [Line Items]
Transaction related costs			$ 0.1		$ 3.7

Acquisitions (Purchase Price Al

Acquisitions (Purchase Price Allocation to the Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Dec. 17, 2020	Mar. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 799.7	$ 827.4
PowerA
Business Acquisition [Line Items]
Purchase price, net of working capital adjustment	$ 321.8
Fair value of contingent consideration		$ 24.9	$ 18.2
Accrued liabilities	9.2
Fair value of liabilities assumed	9.2
Inventory	28.7
Property and equipment	0.2
Identifiable intangibles	239.7
Other assets	13.2
Fair value of assets acquired	281.8
Goodwill	$ 67.4

Acquisitions (Pro Forma) (Detai

Acquisitions (Pro Forma) (Details) - PowerA - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Business Acquisition [Line Items]
Net sales	$ 410.5	$ 414.6
Net (loss) income	$ (20.4)	$ 8
Net (loss) income per common share (diluted)	$ (0.21)	$ 0.08

Long-Term Debt And Short-Term_3

Long-Term Debt And Short-Term Borrowings (Notes Payable and Long-term Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 15, 2021	Dec. 31, 2020	May 23, 2019
Debt Instrument [Line Items]
Total debt	$ 1,214.5		$ 1,136.6
Current portion	48.2		76.5
Debt issuance costs, unamortized	10.4		5.5
Long-term debt, net	1,155.9		1,054.6
Other borrowings
Debt Instrument [Line Items]
Total debt	11.4		5.7
Senior Secured Notes | Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.25% at March 31, 2021)
Debt Instrument [Line Items]
Total debt	$ 273.9		0
Line of Credit Facility, Interest Rate at Period End	2.25%
Senior Secured Notes | Euro Senior Secured Term Loan A, due May 2024 (floating interest rate of 2.50% at December 31, 2020)
Debt Instrument [Line Items]
Total debt	$ 0		$ 287.4
Line of Credit Facility, Interest Rate at Period End			2.50%
Senior Secured Notes | USD Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.45% at March 31, 2021)
Debt Instrument [Line Items]
Total debt	$ 92.5		$ 0
Line of Credit Facility, Interest Rate at Period End	2.45%
Senior Secured Notes | USD Senior Secured Term Loan A, due May 2024 (floating interest rate of 3.50% at December 31, 2020)
Debt Instrument [Line Items]
Total debt	$ 0		$ 92.5	$ 100
Line of Credit Facility, Interest Rate at Period End			3.50%
Senior Secured Notes | Australian Dollar Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.31% at March 31, 2021)
Debt Instrument [Line Items]
Total debt	$ 42.8		$ 0
Line of Credit Facility, Interest Rate at Period End	2.31%
Senior Secured Notes | Australian Dollar Senior Secured Term Loan A, due May 2024 (floating interest rate of 2.57% at December 31, 2020)
Debt Instrument [Line Items]
Total debt	$ 0		$ 43.4
Line of Credit Facility, Interest Rate at Period End			2.57%
Senior Secured Notes | U.S. Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 2.47% at March 31, 2021)
Debt Instrument [Line Items]
Total debt	$ 173.3		$ 0
Line of Credit Facility, Interest Rate at Period End	2.47%
Senior Secured Notes | U.S. Dollar Senior Secured Revolving Credit Facility, due May 2024 (floating interest rate of 3.50% at December 31, 2020)
Debt Instrument [Line Items]
Total debt	$ 0		$ 307.2
Line of Credit Facility, Interest Rate at Period End			3.50%
Senior Secured Notes | Australian Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 2.31% at March 31, 2021)
Debt Instrument [Line Items]
Total debt	$ 45.6		$ 0
Line of Credit Facility, Interest Rate at Period End	2.31%
Senior Secured Notes | Australian Dollar Senior Secured Revolving Credit Facility, due May 2024 (floating interest rate of 2.57% at December 31, 2020)
Debt Instrument [Line Items]
Total debt	$ 0		$ 25.4
Line of Credit Facility, Interest Rate at Period End			2.57%
Senior Notes | Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25%)
Debt Instrument [Line Items]
Total debt	$ 575		$ 0
Stated Percentage	4.25%	4.25%
Senior Notes | Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%)
Debt Instrument [Line Items]
Total debt	$ 0		$ 375
Stated Percentage	5.25%	5.25%	5.25%

Long-Term Debt And Short-Term_4

Long-Term Debt And Short-Term Borrowings (Narrative) (Details) € in Millions, $ in Millions, $ in Millions

Mar. 15, 2021USD ($)

Jul. 26, 2018USD ($)

Jan. 27, 2017USD ($)

Mar. 31, 2021USD ($)

Sep. 30, 2021

Dec. 31, 2020USD ($)

Nov. 10, 2020USD ($)

May 01, 2020USD ($)

Apr. 30, 2020

May 23, 2019USD ($)

May 22, 2019USD ($)

Jan. 27, 2017EUR (€)

Jan. 27, 2017AUD ($)

Debt Instrument [Line Items]

Total debt

$ 1,214.5

$ 1,136.6

Debt Instrument, Covenant, Leverage Ratio

4.50

Debt Instrument, Debt Issuance Costs, Write-off

$ 3.7

Five Year Senior Secured Credit Facility Maturing January 2022 [Member]

Debt Instrument [Line Items]

Debt Instrument, Term

5 years

Secured Debt | Revolving Facility

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 400

Secured Debt | Senior Secured Credit Facility Due January 2022

Debt Instrument [Line Items]

Debt Instrument, Minimum Leverage Ratio for Payments of Dividends or Repurchase of Shares

2.50

Secured Debt | Senior Secured Credit Facility Due May 2024

Debt Instrument [Line Items]

Cash and Cash Equivalent Amount Maximum before Debt Instrument Requires Pay Down Revolving Facility

$ 100

Debt Issuance Costs, Gross

$ 3.2

Secured Debt | Senior Secured Credit Facility Due May 2026

Debt Instrument [Line Items]

Debt Instrument, Covenant, Change In Leverage Ratio

50.00%

Secured Debt | London Interbank Offered Rate (LIBOR) | Senior Secured Credit Facility Due May 2024

Debt Instrument [Line Items]

Debt Instrument, Basis Spread on Variable Rate

2.25%

Secured Debt | Euro Term Loan A

Debt Instrument [Line Items]

Debt Instrument, Face Amount

320.8

€ 300

Secured Debt | AUD Term Loan A

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 60.4

$ 80

Secured Debt | Senior Secured Credit Facility Due January 2022 | Revolving Facility

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 500

$ 500

Line of Credit Facility, Increase (Decrease), Net

$ 100

Secured Debt | USD Senior Secured Term Loan A, due May 2024 (floating interest rate of 3.50% at December 31, 2020)

Debt Instrument [Line Items]

Total debt

$ 0

92.5

$ 100

Secured Debt | Euro Senior Secured Term Loan A, due May 2024 (floating interest rate of 2.50% at December 31, 2020)

Debt Instrument [Line Items]

Total debt

0

287.4

Secured Debt | Australian Dollar Senior Secured Term Loan A, due May 2024 (floating interest rate of 2.57% at December 31, 2020)

Debt Instrument [Line Items]

Total debt

0

43.4

Secured Debt | U.S. Dollar Senior Secured Revolving Credit Facility, due May 2024 (floating interest rate of 3.50% at December 31, 2020)

Debt Instrument [Line Items]

Total debt

0

307.2

Secured Debt | Australian Dollar Senior Secured Revolving Credit Facility, due May 2024 (floating interest rate of 2.57% at December 31, 2020)

Debt Instrument [Line Items]

Total debt

$ 0

25.4

Secured Debt | Senior Secured Credit Facility Due May 2026

Debt Instrument [Line Items]

Maximum Consolidated Leverage Ratio

5.25

Secured Debt | Senior Secured Credit Facility Due May 2026 | March 2021

Debt Instrument [Line Items]

Maximum Consolidated Leverage Ratio

5.25

Secured Debt | Senior Secured Credit Facility Due May 2024 | Revolving Facility

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 600

Total debt

$ 218.9

Amount available for borrowings under Senior Secured Revolving Credit Facilities

367.1

Letters of credit outstanding

14

Secured Debt | Senior Secured Credit Facility Due May 2024 | Senior Secured Credit Facility Due May 2024

Debt Instrument [Line Items]

Debt Instrument, Minimum Leverage Ratio for Payments of Dividends or Repurchase of Shares

3.25

Senior Notes | Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%)

Debt Instrument [Line Items]

Total debt

$ 0

$ 375

Stated Percentage

5.25%

5.25%

5.25%

Repayments of Debt

$ 178

Debt Instrument, Redemption Price

390.6

Debt Instrument, Redemption Price, Principal

375

Debt Instrument, Redemption Price, Call Premium

9.8

Debt Instrument, Redemption Price, Accrued and Unpaid Interest

5.8

Senior Notes | Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25%)

Debt Instrument [Line Items]

Debt Instrument, Face Amount

575

Total debt

$ 575

$ 0

Debt Issuance Costs, Gross

$ 8.2

Stated Percentage

4.25%

4.25%

Minimum | Secured Debt | Senior Secured Credit Facility Due January 2022

Debt Instrument [Line Items]

Consolidated Fixed Charge Coverage Ratio

1.25

Minimum | Secured Debt | Senior Secured Credit Facility Due May 2024

Debt Instrument [Line Items]

Interest Coverage Ratio

3

Maximum | Secured Debt | Senior Secured Credit Facility Due May 2024

Debt Instrument [Line Items]

Debt Instrument, Covenant, Leverage Ratio

4

4.75

3.75

Maximum | Secured Debt | Forecast [Member] | Senior Secured Credit Facility Due May 2024

Debt Instrument [Line Items]

Debt Instrument, Covenant, Leverage Ratio

3.75

Long-term Debt and Short-term_5

Long-term Debt and Short-term Borrowings (Amended Maximum Consolidated Leverage Ratio) (Details) - Senior Secured Credit Facility Due May 2026 - Secured Debt	Mar. 31, 2021	Nov. 10, 2020
Line of Credit Facility [Line Items]
Maximum Consolidated Leverage Ratio	5.25
March 2021
Line of Credit Facility [Line Items]
Maximum Consolidated Leverage Ratio		5.25
June 2021
Line of Credit Facility [Line Items]
Maximum Consolidated Leverage Ratio		5.25
September 2021
Line of Credit Facility [Line Items]
Maximum Consolidated Leverage Ratio		4.75
December 2021
Line of Credit Facility [Line Items]
Maximum Consolidated Leverage Ratio		4.25
March 2022
Line of Credit Facility [Line Items]
Maximum Consolidated Leverage Ratio		4.25
June 2022
Line of Credit Facility [Line Items]
Maximum Consolidated Leverage Ratio		4.25
September 2022 and thereafter
Line of Credit Facility [Line Items]
Maximum Consolidated Leverage Ratio		3.75

Long-Term Debt And Short-Term_6

Long-Term Debt And Short-Term Borrowings (Interest Rates) (Details) - Secured Debt - Senior Secured Credit Facility Due May 2026	3 Months Ended
	Mar. 31, 2021
> 4.50 to 1.00
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
≤ 4.50 to 1.00 and > 4.00 to 1.00
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.375%
≤ 4.00 to 1.00 and > 3.50 to 1.00
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
≤ 3.50 to 1.00 and > 3.00 to 1.00
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.30%
≤ 3.00 to 1.00 and > 2.00 to 1.00
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
≤ 2.00 to 1.00
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.20%
Euro/AUD/CDN | > 4.50 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Euro/AUD/CDN | ≤ 4.50 to 1.00 and > 4.00 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Euro/AUD/CDN | ≤ 4.00 to 1.00 and > 3.50 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Euro/AUD/CDN | ≤ 3.50 to 1.00 and > 3.00 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Euro/AUD/CDN | ≤ 3.00 to 1.00 and > 2.00 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Euro/AUD/CDN | ≤ 2.00 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Base Rate [Member] | > 4.50 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Base Rate [Member] | ≤ 4.50 to 1.00 and > 4.00 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Base Rate [Member] | ≤ 4.00 to 1.00 and > 3.50 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Base Rate [Member] | ≤ 3.50 to 1.00 and > 3.00 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Base Rate [Member] | ≤ 3.00 to 1.00 and > 2.00 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Base Rate [Member] | ≤ 2.00 to 1.00
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%

Leases (Lease Expense) (Details

Leases (Lease Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease cost	$ 7.2	$ 7.3
Sublease income	(0.3)	(0.4)
Lease, Cost	$ 6.9	$ 6.9

Leases (Other Information) (Det

Leases (Other Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating cash flows from operating leases	$ 7.2	$ 7.3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 4.2	1
Weighted average remaining lease term, operating leases (in years)	6 years 3 months 18 days
Weighted average discount rate, operating leases (as a percentage)	5.30%
Lease, Cost	$ 6.9	$ 6.9

Leases (Future Minimum Lease Pa

Leases (Future Minimum Lease Payments) (Details) $ in Millions	Mar. 31, 2021USD ($)
Leases [Abstract]
2021	$ 20.1
2022	20.7
2023	16.1
2024	13.3
2025	9.9
2026	8.3
Thereafter	24.2
Total minimum lease payments	112.6
Less imputed interest	19.1
Future minimum payments for leases, net of sublease rental income and imputed interest	$ 93.5

Pension And Other Retiree Ben_3

Pension And Other Retiree Benefits (Net Periodic Benefit Expense) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to defined benefit plans for 2020		$ 24.5
Contributions by company to date		6.6
Pension | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost		0.4	$ 0.4
Interest cost		1	1.5
Expected return on plan assets		(2.8)	(2.9)
Amortization of net loss (gain)		1	0.8
Amortization of prior service cost		0.1	0.1
Curtailment loss(1)		1.4	0
Net periodic benefit cost (income) (2)	[1]	1.1	(0.1)
Pension | International
Defined Benefit Plan Disclosure [Line Items]
Service cost		0.4	0.4
Interest cost		1.6	2.4
Expected return on plan assets		(4.8)	(4.7)
Amortization of net loss (gain)		1.8	1.2
Amortization of prior service cost		0.1	0.1
Curtailment loss(1)		0	0
Net periodic benefit cost (income) (2)	[1]	(0.9)	(0.6)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost		0	0
Interest cost		0	0
Expected return on plan assets		0	0
Amortization of net loss (gain)		(0.1)	(0.1)
Amortization of prior service cost		0	0
Curtailment loss(1)		0	0
Net periodic benefit cost (income) (2)	[1]	$ (0.1)	$ (0.1)
[1]	The components, other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Operations.

Stock-Based Compensation (Share

Stock-Based Compensation (Share-based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 4.8	$ 0.9
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	1.7	0.8
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	2.5	1
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.6	$ (0.9)

Stock-Based Compensation (Unrec

Stock-Based Compensation (Unrecognized Compensation Expense) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense	$ 5.2
Weighted Average Years Expense To Be Recognized Over	2 years 4 months 24 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense	$ 5.2
Weighted Average Years Expense To Be Recognized Over	2 years 1 month 6 days
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense	$ 15
Weighted Average Years Expense To Be Recognized Over	2 years 4 months 24 days

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 4.8	$ 0.9
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 1.7	0.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	1,526,654
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 2.5	1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	254,460
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.6	$ (0.9)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	1,652,526

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 40.2	$ 36.8
Work in process	3.9	3.5
Finished goods	307.1	264.8
Total inventories	$ 351.2	$ 305.1

Goodwill And Identifiable Int_3

Goodwill And Identifiable Intangibles (Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2016
Goodwill [Roll Forward]
Balance at December 31, 2020	$ 827.4
PowerA working capital adjustment	(18.2)
Translation	(9.5)
Balance at March 31, 2021	799.7
Goodwill, accumulated impairment losses		$ 215.1
ACCO Brands North America
Goodwill [Roll Forward]
Balance at December 31, 2020	461.2
PowerA working capital adjustment	(18.2)
Translation	0
Balance at March 31, 2021	443
ACCO Brands EMEA
Goodwill [Roll Forward]
Balance at December 31, 2020	188.2
PowerA working capital adjustment	0
Translation	(8.4)
Balance at March 31, 2021	179.8
ACCO Brands International
Goodwill [Roll Forward]
Balance at December 31, 2020	178
PowerA working capital adjustment	0
Translation	(1.1)
Balance at March 31, 2021	$ 176.9

Goodwill And Identifiable Int_4

Goodwill And Identifiable Intangibles (Acquired Finite-Lived Intangibles) (Details) - PowerA - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 17, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		$ 239.7
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		21.6
Finite-lived intangible asset, useful life	15 years
Customer and contractual relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		127.6
Finite-lived intangible asset, useful life	15 years
Vendor Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		87.7
Finite-lived intangible asset, useful life	15 years
Developed Technology Rights
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		$ 2.8
Finite-lived intangible asset, useful life	5 years

Goodwill And Identifiable Int_5

Goodwill And Identifiable Intangibles (Intangible Assets) (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		$ 806.5	$ 816.9
Amortizable intangible assets, Accumulated Amortization		(271.4)	(262.9)
Amortizable intangible assets, Net Book Value		535.1	554
Total identifiable intangibles, Gross Carrying Amounts		1,263.8	1,284.4
Total identifiable intangibles, Accumulated Amortization		(315.9)	(307.4)
Total identifiable intangibles, Net Book Value		947.9	977
Trade Names
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		339.3	343.5
Amortizable intangible assets, Accumulated Amortization		(100.5)	(97.7)
Amortizable intangible assets, Net Book Value		238.8	245.8
Customer and contractual relationships
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		370.8	376.8
Amortizable intangible assets, Accumulated Amortization		(167)	(162.9)
Amortizable intangible assets, Net Book Value		203.8	213.9
Vendor Relationships
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		87.7	87.7
Amortizable intangible assets, Accumulated Amortization		(1.7)	(0.2)
Amortizable intangible assets, Net Book Value		86	87.5
Patents
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		8.7	8.9
Amortizable intangible assets, Accumulated Amortization		(2.2)	(2.1)
Amortizable intangible assets, Net Book Value		6.5	6.8
Trade Names
Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross carrying amount		457.3	467.5
Indefinite lived intangible asset accumulated amortization prior to the adoption of authoritative guidance	[1]	(44.5)	(44.5)
Indefinite-lived intangible assets, Net Book Value		$ 412.8	$ 423
[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 Intangibles (Estimated Amortization Expense) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangibles		$ 12	$ 8.4
Estimated amortization expense, 2021	[1]	46.3
Estimated amortization expense, 2022	[1]	42.6
Estimated amortization expense, 2023	[1]	40.2
Estimated amortization expense, 2024	[1]	38.5
Estimated amortization expense, 2025	[1]	36.8
Estimated amortization expense, 2026	[1]	$ 34.5
[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.

Goodwill And Identifiable Int_7

Goodwill And Identifiable Intangibles (Narrative) (Details) - PowerA - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 17, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		$ 239.7
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		21.6
Finite-lived intangible asset, useful life	15 years
Customer and contractual relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		127.6
Finite-lived intangible asset, useful life	15 years
Vendor Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		87.7
Finite-lived intangible asset, useful life	15 years
Developed Technology Rights
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles		$ 2.8
Finite-lived intangible asset, useful life	5 years

Restructuring (Restructuring Ch

Restructuring (Restructuring Charges and Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period	$ 9.3		$ 11.8
Provision	3.9		0.3
Cash Expenditures	(2.8)		(2.6)
Non-cash Items/ Currency Change	(0.1)		(0.4)
Balance at End of Period	10.3		9.1
Employee termination costs(1)
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period	8.1		10.7
Provision	3.1		0.3
Cash Expenditures	(2.7)		(2)
Non-cash Items/ Currency Change	(0.1)		(0.4)
Balance at End of Period	$ 8.4	[1]	8.6
Restructuring and Related Costs, Payment Period	12 months
Termination of lease agreements(2)
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period	$ 1		0.6
Provision	0.8		0
Cash Expenditures	(0.1)		(0.5)
Non-cash Items/ Currency Change	0		0
Balance at End of Period	$ 1.7	[2]	0.1
Restructuring and Related Costs, Payment Period	12 months
Other(3)
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period	$ 0.2		0.5
Provision	0		0
Cash Expenditures	0		(0.1)
Non-cash Items/ Currency Change	0		0
Balance at End of Period	$ 0.2	[3]	$ 0.4
Restructuring and Related Costs, Payment Period	9 months
[1]	(1) We expect the remaining $8.4 million employee termination costs to be substantially paid in the next twelve months.
[2]	(2) We expect the remaining $1.7 million lease termination costs to be substantially paid in the next twelve months.
[3]	(3) We expect the remaining $0.2 million of other costs to be substantially paid in the next nine months.

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2012
Income Tax Examination [Line Items]
Income tax (benefit) expense	$ (5.9)		$ 3.1
Income before income tax	$ (26.3)		$ 11.1
Effective Income Tax Rate Reconciliation, Percent	22.40%		27.90%
State and Local Jurisdiction | Minimum
Income Tax Examination [Line Items]
Statutes of limitation, period	2 years
State and Local Jurisdiction | Maximum
Income Tax Examination [Line Items]
Statutes of limitation, period	5 years
Domestic Tax Authority | Internal Revenue Service (IRS) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2017
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	5 years
Foreign Tax Authority | Australian Taxation Office | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2016
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Income Tax Examination [Line Items]
Income tax (benefit) expense				$ 1.6
Income Tax Examination, Interest Expense	$ 0.1		$ 0.1
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2015
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007 to 2012
Income Tax Examination [Line Items]
Unrecognized Tax Benefits							$ 44.5
Income Tax Contingency, Potential Assessment, Acquisition, Fair Value of Liabilities Accrued							$ 43.3
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2008 to 2010
Income Tax Examination [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		$ 1.2			$ 5.6
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2011
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount						$ 5.6
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Minimum
Income Tax Examination [Line Items]
Penalty rate	75.00%
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Maximum | Tax Year 2007
Income Tax Examination [Line Items]
Penalty rate	150.00%
Foreign Tax Authority | Canada Revenue Agency | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2016
Foreign Tax Authority | Federal Ministry of Finance, Germany | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2015
Foreign Tax Authority | Swedish Tax Agency (Skatteverket) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2015
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year	2018
Other Noncurrent Liabilities | Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007 to 2010
Income Tax Examination [Line Items]
Unrecognized Tax Benefits	$ 25.7

Earnings Per Share (Details)

Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items]
Common Stock, Shares, Outstanding	95,500,000	94,400,000
Stock Repurchased and Retired During Period, Shares	0	2,690,292
Treasury Stock, Shares, Acquired	100,000	200,000
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted-average number of common shares outstanding - basic	95,100,000	96,000,000
Weighted-average number of common shares outstanding - diluted	95,100,000	97,500,000
Potentially dilutive shares excluded from computation of dilutive earnings per share	8,400,000	5,200,000
Stock options
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	0	200,000
Restricted stock units
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	0	1,300,000

Derivative Financial Instrume_3

Derivative Financial Instruments (Narrative) (Details) - Foreign exchange contracts - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	$ 130.7	$ 164.7
Cash Flow Hedging | Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	$ 153.2	$ 134.3

Derivative Financial Instrume_4

Derivative Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 22.4	$ 33.8
Derivative Liabilities	22.5	38.3
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	2.7	0.1
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1.4	5
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0.7	1.6
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	2.1	1.2
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	19	32.1
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 19	$ 32.1

Derivative Financial Instrume_5

Derivative Financial Instruments (Effect of Derivative Instruments) (Details) - Foreign exchange contracts - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 130.7		$ 164.7
Derivatives not designated as hedging instruments | Other expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Income	1.2	$ (9.3)
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI (Effective Portion)	4.4	4.5
Cash Flow Hedging | Cost of products sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Reclassified from AOCI to Income (Effective Portion)	1.5	$ (1.2)
Cash Flow Hedging | Derivatives designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 153.2		$ 134.3

Fair Value Of Financial Instr_3

Fair Value Of Financial Instruments Schedule of Fair Value Assets and Liabilities measured on a Recurring Basis (Details) - Fair Value, Inputs, Level 2 - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	$ 1,180	$ 1,146.9
Foreign currency contracts, assets	22.4	33.8
Foreign currency contracts, liabilities	$ 22.5	$ 38.3

Fair Value Of Financial Instr_4

Fair Value Of Financial Instruments Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Total debt	$ 1,214.5	$ 1,136.6

Fair Value Of Financial Instr_5

Fair Value Of Financial Instruments (Reconciliation) (Details) - PowerA $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at December 31, 2020	$ 18.2
Change in fair value	6.7
Balance at March 31, 2021	$ 24.9

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Rollforward) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2020	$ (564.2)
Other comprehensive income (loss) before reclassifications, net of tax	(17.4)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	4.4
Balance at March 31, 2021	(577.2)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2020	(3.1)
Other comprehensive income (loss) before reclassifications, net of tax	3
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	1.1
Balance at March 31, 2021	1
Foreign Currency Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2020	(318.8)
Other comprehensive income (loss) before reclassifications, net of tax	(20.7)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0
Balance at March 31, 2021	(339.5)
Unrecognized Pension and Other Post-retirement Benefit Costs
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2020	(242.3)
Other comprehensive income (loss) before reclassifications, net of tax	0.3
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	3.3
Balance at March 31, 2021	$ (238.7)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold		$ (295)	$ (271.9)
(Loss) income before income tax		(26.3)	11.1
Income tax (expense) benefit		5.9	(3.1)
Net (loss) income		(20.4)	8
Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net (loss) income		(4.4)	(0.7)
Unrecognized Pension and Other Post-retirement Benefit Costs | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial loss	[1]	(2.7)	(1.9)
Amortization of prior service cost	[1]	(1.6)	(0.2)
(Loss) income before income tax		(4.3)	(2.1)
Income tax (expense) benefit		1	0.5
Net (loss) income		(3.3)	(1.6)
Foreign exchange contracts | Derivative Financial Instruments | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold		(1.5)	1.2
Income tax (expense) benefit		0.4	(0.3)
Net (loss) income		$ (1.1)	$ 0.9
[1]	These AOCI components are included in the computation of net periodic benefit cost for pension and post-retirement plans. See "Note 6. Pension and Other Retiree Benefits" for additional details.

Revenue Recognition Service or

Revenue Recognition Service or Extended Maintenance Agreements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Unearned revenue associated with outstanding contracts	$ 2.8	$ 3
Revenue recognized	$ 1.1

Revenue Recognition (Unearned R

Revenue Recognition (Unearned Revenue) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognized	$ 1.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unearned revenue	$ 2.1
Expected timing of satisfaction	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unearned revenue	$ 0.7
Expected timing of satisfaction	12 months

Revenue Recognition (Schedule o

Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales		$ 410.5	$ 384.1
Product and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales		395.7	363.6
Product and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales		14.8	20.5
ACCO Brands North America
Disaggregation of Revenue [Line Items]
Net sales		188.8	167.8
ACCO Brands North America | United States
Disaggregation of Revenue [Line Items]
Net sales		170.3	147.4
ACCO Brands North America | Canada
Disaggregation of Revenue [Line Items]
Net sales		18.5	20.4
ACCO Brands EMEA
Disaggregation of Revenue [Line Items]
Net sales	[1]	156.9	127.5
ACCO Brands International
Disaggregation of Revenue [Line Items]
Net sales		64.8	88.8
ACCO Brands International | Australia/N.Z.
Disaggregation of Revenue [Line Items]
Net sales		32.1	28.9
ACCO Brands International | Latin America
Disaggregation of Revenue [Line Items]
Net sales		19.5	49
ACCO Brands International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Net sales		$ 13.2	$ 10.9
[1]	(2) 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 (Net Sales by Segment) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)segment	Mar. 31, 2020USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment	3
Net sales	$ 410.5	$ 384.1
ACCO Brands North America
Segment Reporting Information [Line Items]
Net sales	188.8	167.8
ACCO Brands EMEA
Segment Reporting Information [Line Items]
Net sales	156.9	127.5
ACCO Brands International
Segment Reporting Information [Line Items]
Net sales	$ 64.8	$ 88.8

Information On Business Segme_4

Information On Business Segments (Operating Income by Segment) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Operating income	[1]	$ (1.1)	$ 17.4
Change in fair value of contingent consideration		(6.7)	0
Interest expense		13.2	8.6
Interest income		(0.1)	(0.3)
Non-operating pension income		(0.8)	(1.5)
Other expense (income), net		12.9	(0.5)
Income before income tax		(26.3)	11.1
Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	16.7	25.5
Corporate
Segment Reporting Information [Line Items]
Operating income		(11.1)	(8.1)	[1]
ACCO Brands North America | Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	(0.7)	7.6
ACCO Brands EMEA | Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	16.8	12
ACCO Brands International | Operating Segment
Segment Reporting Information [Line Items]
Operating income	[1]	$ 0.6	$ 5.9
[1]	Operating income (loss) as presented in the segment table above is defined as i) net sales; ii) less cost of products sold; iii) less selling, general and administrative expenses; iv) less amortization of intangibles; v) less restructuring charges; and vi) less change in the fair value of contingent consideration.

Commitments And Contingencies N

Commitments And Contingencies Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019
Loss Contingencies [Line Items]
Income tax (benefit) expense	$ (5.9)		$ 3.1
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Loss Contingencies [Line Items]
Brazil Tax Credits		$ 3.3	$ 4.3
Income tax (benefit) expense				$ 1.6

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Millions	Apr. 01, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Acquired cost		$ 340
Subsequent Event
Subsequent Event [Line Items]
Acquired cost	$ 4