ACCO Brands (ACCO) 10-Q 28 Oct 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2021	Oct. 21, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 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		95,730,863
Entity Central Index Key	0000712034
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 58.1	$ 36.6
Accounts receivable, net	362.6	356
Inventories	413.9	305.1
Other current assets	52	30.5
Total current assets	886.6	728.2
Total property, plant and equipment	656.3	657.8
Less: accumulated depreciation	(436.8)	(416.4)
Property, plant and equipment, net	219.5	241.4
Right of use asset, leases	84	89.2
Deferred income taxes	126.6	136.5
Goodwill	804.2	827.4
Identifiable intangibles, net	919.4	977
Other non-current assets	31.7	49
Total assets	3,072	3,048.7
Current liabilities:
Notes payable	8.1	5.7
Current portion of long-term debt	28.1	70.8
Accounts payable	233.5	180.2
Accrued compensation	53.5	41
Accrued customer program liabilities	91.6	91.4
Lease liabilities	21.8	22.6
Current portion of contingent consideration	22.8	10.4
Other current liabilities	126.7	134.8
Total current liabilities	586.1	556.9
Long-term debt, net	1,083.9	1,054.6
Long-term lease liabilities	70.4	76.5
Deferred income taxes	156.6	170.6
Pension and post-retirement benefit obligations	275.9	317.1
Contingent consideration	11.9	7.8
Other non-current liabilities	102.2	122.5
Total liabilities	2,287	2,306
Stockholders' equity:
Common stock	1	1
Treasury stock	(40.8)	(39.9)
Paid-in capital	1,898.4	1,883.1
Accumulated other comprehensive loss	(565.4)	(564.2)
Accumulated deficit	(508.2)	(537.3)
Total stockholders' equity	785	742.7
Total liabilities and stockholders' equity	$ 3,072	$ 3,048.7

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales		$ 526.7	$ 444.1	$ 1,455	$ 1,195.1
Cost of products sold		369.5	317	1,018.2	845.8
Gross profit		157.2	127.1	436.8	349.3
Operating costs and expenses:
Selling, general and administrative expenses		101.8	84.4	293.5	247.7
Amortization of intangibles		11.6	7.9	35.2	24.1
Restructuring charges		0.3	0.5	4.2	7.3
Change in fair value of contingent consideration		4.9	0	16.5	0
Total operating costs and expenses		118.6	92.8	349.4	279.1
Operating income	[1]	38.6	34.3	87.4	70.2
Non-operating expense (income):
Interest expense		11.2	10.2	36	28.7
Interest income		(0.6)	(0.2)	(1.2)	(0.8)
Non-operating pension income		(2.3)	(1.4)	(5.6)	(4.4)
Other expense, net		0.1	0.1	4	0.8
Income before income tax		30.2	25.6	54.2	45.9
Income tax expense		10	6.8	5.8	13.7
Net income		$ 20.2	$ 18.8	$ 48.4	$ 32.2
Per share:
Basic income per share (in USD per share)		$ 0.21	$ 0.20	$ 0.51	$ 0.34
Diluted income per share (in USD per share)		$ 0.21	$ 0.20	$ 0.50	$ 0.34
Weighted average number of shares outstanding:
Basic (shares)		95.6	94.5	95.4	95
Diluted (shares)		97.3	95.6	97	96.2
[1]	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 Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 20.2	$ 18.8	$ 48.4	$ 32.2
Other comprehensive income (loss), net of tax:
Unrealized income (loss) on derivative instruments, net of tax (expense) benefit of $(1.0) and $0.2 and $(2.9) and $0.3, respectively	2.4	(0.6)	6.7	(0.6)
Foreign currency translation adjustments, net of tax benefit (expense) of $0.2 and $0.1 and $(1.1) and $1.1, respectively	(22.3)	3.6	(18.6)	(53.7)
Recognition of deferred pension and other post-retirement items, net of tax (expense) benefit of $(2.1) and $1.2 and $(3.4) and $(1.7), respectively	6.6	(4)	10.7	5.8
Other comprehensive loss, net of tax	(13.3)	(1)	(1.2)	(48.5)
Comprehensive income (loss)	$ 6.9	$ 17.8	$ 47.2	$ (16.3)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Unrealized income (loss) on derivative instruments, net of tax (expense) benefit of $(1.0) and $0.2 and $(2.9) and $0.3, respectively	$ (1)	$ 0.2	$ (2.9)	$ 0.3
Foreign currency translation adjustments, net of tax benefit (expense) of $0.2 and $0.1 and $(1.1) and $1.1, respectively	0.2	0.1	(1.1)	1.1
Recognition of deferred pension and other post-retirement items, net of tax (expense) benefit of $(2.1) and $1.2 and $(3.4) and $(1.7), respectively	$ (2.1)	$ 1.2	$ (3.4)	$ (1.7)

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net income	$ 48.4	$ 32.2
Amortization of inventory step-up	3	0
Change in fair value of contingent consideration	16.5	0
Depreciation	29.4	28.2
Other non-cash items	0	0.5
Amortization of debt issuance costs	2.1	1.7
Amortization of intangibles	35.2	24.1
Stock-based compensation	12.2	5.2
Loss on debt extinguishment	3.7	0
Changes in balance sheet items:
Accounts receivable	(18.3)	78.7
Inventories	(116.2)	(28.4)
Other assets	(14.4)	(1)
Accounts payable	55.1	(67.1)
Accrued expenses and other liabilities	3.2	(47.3)
Accrued income taxes	(15.9)	(5)
Net cash provided by operating activities	44	21.8
Investing activities
Additions to property, plant and equipment	(13.9)	(11.8)
Cost of acquisitions, net of cash acquired	15.4	0.6
Net cash provided (used) by investing activities	1.5	(11.2)
Financing activities
Proceeds from long-term borrowings	651.4	231.5
Repayments of long-term debt	(638.8)	(146.4)
Proceeds of notes payable, net	2.3	2.5
Payment for debt premium	(9.8)	0
Payments for debt issuance costs	(10.5)	(1.6)
Dividends paid	(18.6)	(18.4)
Repurchases of common stock	0	(18.9)
Payments related to tax withholding for stock-based compensation	(0.9)	(1.8)
Proceeds from the exercise of stock options	2.4	1.7
Net cash (used) provided by financing activities	(22.5)	48.6
Effect of foreign exchange rate changes on cash and cash equivalents	(1.5)	(1.2)
Net increase in cash and cash equivalents	21.5	58
Cash and cash equivalents
Beginning of the period	36.6	27.8
End of the period	58.1	85.8
Cash paid during the year for:
Interest	33.7	21.4
Income taxes	$ 21.2	$ 20.1

Consolidated Statements of Stoc

Consolidated Statements of Stockholders’ Equity (Unaudited) - 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 income (loss)	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 (in shares)	692,421	898,664			206,243
Common stock repurchases ( in shares)	(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, 2019	$ 773.7	$ 1	1,890.8	(505.7)	$ (38.2)	(574.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	32.2
Gain (loss) on derivative financial instruments, net of tax	(0.6)
Pension and post-retirement adjustment, net of tax	5.8
Balance at end of period at Sep. 30, 2020	$ 725.2	$ 1	1,878.9	(554.2)	$ (39.9)	(560.6)
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 repurchases ( in shares)	(2,700,000)
Balance at end of period (in shares) at Sep. 30, 2020	94,496,837	98,683,727			4,186,890
Balance at start of period at Mar. 31, 2020	$ 717.9	$ 1	1,874.3	(545.1)	$ (39.9)	(572.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5.4					5.4
Gain (loss) on derivative financial instruments, net of tax	(2.4)			(2.4)
Translation impact, net of tax	(7.6)			(7.6)
Pension and post-retirement adjustment, net of tax	1.9			1.9
Stock-based compensation	2.5		2.6			(0.1)
Dividends declared	(6.1)					(6.1)
Balance at end of period at Jun. 30, 2020	$ 711.6	$ 1	1,876.9	(553.2)	$ (39.9)	(573.2)
Balance at start of period (in shares) at Mar. 31, 2020	94,447,617	98,621,305			4,173,688
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes (in shares)	14,530	26,957			12,427
Balance at end of period (in shares) at Jun. 30, 2020	94,462,147	98,648,262			4,186,115
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 18.8					18.8
Gain (loss) on derivative financial instruments, net of tax	(0.6)			(0.6)
Translation impact, net of tax	3.6			3.6
Pension and post-retirement adjustment, net of tax	(4)			(4)
Stock-based compensation	1.8		1.9			(0.1)
Common stock issued, net of shares withheld for employee taxes	0.1		0.1
Dividends declared	(6.1)					(6.1)
Balance at end of period at Sep. 30, 2020	$ 725.2	$ 1	1,878.9	(554.2)	$ (39.9)	(560.6)
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes (in shares)	34,690	35,465			775
Common stock repurchases ( in shares)	0
Balance at end of period (in shares) at Sep. 30, 2020	94,496,837	98,683,727			4,186,890
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 income (loss)	(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 (in shares)	543,156	652,755			109,599
Balance at end of period (in shares) at Mar. 31, 2021	95,485,721	99,782,210			4,296,489
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 income (loss)	48.4
Gain (loss) on derivative financial instruments, net of tax	6.7
Pension and post-retirement adjustment, net of tax	10.7
Balance at end of period at Sep. 30, 2021	$ 785	$ 1	1,898.4	(565.4)	$ (40.8)	(508.2)
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 repurchases ( in shares)	0
Balance at end of period (in shares) at Sep. 30, 2021	95,662,069	99,964,324			4,302,255
Balance at start of period at Mar. 31, 2021	$ 708.8	$ 1	1,889.9	(577.2)	$ (40.8)	(564.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	48.6					48.6
Gain (loss) on derivative financial instruments, net of tax	0.2			0.2
Translation impact, net of tax	24.4			24.4
Pension and post-retirement adjustment, net of tax	0.5			0.5
Stock-based compensation	4.2		4.4			(0.2)
Common stock issued, net of shares withheld for employee taxes	0.1		0.1		0
Dividends declared	(6.2)					(6.2)
Other	0.1		0.2			(0.1)
Balance at end of period at Jun. 30, 2021	$ 780.7	$ 1	1,894.6	(552.1)	$ (40.8)	(522)
Balance at start of period (in shares) at Mar. 31, 2021	95,485,721	99,782,210			4,296,489
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes (in shares)	97,160	97,160			0
Balance at end of period (in shares) at Jun. 30, 2021	95,582,881	99,879,370			4,296,489
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 20.2					20.2
Gain (loss) on derivative financial instruments, net of tax	2.4			2.4
Translation impact, net of tax	(22.3)			(22.3)
Pension and post-retirement adjustment, net of tax	6.6			6.6
Stock-based compensation	3.2		3.4			(0.2)
Common stock issued, net of shares withheld for employee taxes	0.4		0.4
Dividends declared	(6.2)					(6.2)
Balance at end of period at Sep. 30, 2021	$ 785	$ 1	$ 1,898.4	$ (565.4)	$ (40.8)	$ (508.2)
Increase (Decrease) In Capital Stock [Roll Forward]
Common stock issued, net of shares withheld for employee taxes (in shares)	79,188	84,954			5,766
Common stock repurchases ( in shares)	0
Balance at end of period (in shares) at Sep. 30, 2021	95,662,069	99,964,324			4,302,255

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Common stock, dividends per share, declared	$ 0.065	$ 0.065	$ 0.065	$ 0.065	$ 0.065	$ 0.065

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 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 September 30, 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 September 30, 2021, the related Consolidated Statements of Income, the Consolidated Statements of Comprehensive Income (Loss), the Consolidated Statements of Stockholders' Equity for the three and nine months ended September 30, 2021 and 2020 and Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 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 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 September 30, 2021 and 2020, and the financial position of the Company as of September 30, 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 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 $34.7 million as of September 30, 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. On April 1, 2021, we completed the acquisition of Franken Planungs-und Organisationsmittel GmbH (“Franken”), for a purchase price of €2.4 million (US$2.8 million, based on April 1, 2021 exchange rates), net of cash acquired of $1.1 million. Franken is a provider of visual communication products, including boards, markers, planning tools, as well as creative and training products. Franken is a German company that is included in the Company’s EMEA reporting segment. 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 and Adopted Accounting Standards	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements and Adopted Accounting Standards	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 nine months of 2021 that had a material effect on the Company’s financial condition, results of operations or cash flow.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Acquisitions	3. Acquisitions Acquisition of Franken On April 1, 2021, we completed the acquisition of Franken, for a purchase price of €2.4 million (US$2.8 million, based on April 1, 2021 exchange rates), net of cash acquired of $1.1 million. Franken is a provider of visual communication products, including boards, markers, planning tools, as well as creative and training products. Franken is a German company that is included in the Company’s EMEA reporting segment. Pro forma financial information is not presented due to immateriality. 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 purchase price was $321.8 million, net of a working capital adjustment received of $18.2 million, plus an additional earnout of up to $55.0 million in cash. The earnout is contingent upon PowerA achieving one- and two- year sales and profit growth objectives. The fair value of the contingent earnout liability was $34.7 million as of September 30, 2021. The PowerA Acquisition and related expenses were funded by cash on hand, as well as borrowings from our revolving credit facility. 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 and nine months ended September 30, 2021 we re $56.8 million and $170.2 million, respectively. During the third quarter of 2021 we finalized our fair value estimate of assets acquired and liabilities assumed as of the acquisition date. The following table presents the 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 29.3 Property and equipment 0.2 Identifiable intangibles 235.4 Other assets 13.2 Fair value of assets acquired $ 278.1 Goodwill $ 71.1 During the year ended December 31, 2020, transaction costs related to the PowerA Acquisition were $3.7 million, and for the nine months ended September 30, 2021, they wer e $0.1 million. These costs were reported as SG&A expenses in the Company's Consolidated Statements of Income. 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 and nine months ended September 30, 2021 and 2020 w ould have been as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Net sales $ 526.7 $ 501.4 $ 1,455.0 $ 1,325.5 Net income 20.2 24.9 48.4 41.6 Net income per diluted common share $ 0.21 $ 0.26 $ 0.50 $ 0.43 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 accounting by the Company for the PowerA Acquisition.

Long-Term Debt and Short-Term B

Long-Term Debt and Short-Term Borrowings	9 Months Ended
	Sep. 30, 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 was locked at LIBOR plus 2.25 percent until the Company published its financial results for the fiscal quarter ended June 30, 2021, and it became 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. Interest on the New Notes is payable 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, 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, net "), and accrued and unpaid interest of $5.8 million (included in "Interest expense"). Also included in " Other expense, 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 September 30, 2021, there were $153.0 million in borrowings outstanding under the Revolving Facility. The remaining amount available for borrowings was $434.5 million (allowing for $12.5 million of letters of credit outstanding on that date). As of September 30, 2021, our Consolidated Leverage Ratio was approximately 3.8 to 1.00 versus our maximum covenant of 4.75 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 September 30, 2021 and December 31, 2020: (in millions) September 30, December 31, Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.25% at September 30, 2021) $ 264.3 $ — 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 2.38% at September 30, 2021) 90.2 — 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 2.32% at September 30, 2021) 39.5 — 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 2.33% at September 30, 2021) 120.4 — 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 September 30, 2021) 32.6 — 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 8.1 5.7 Total debt 1,130.1 1,136.6 Less: Current portion 36.2 76.5 Debt issuance costs, unamortized 10.0 5.5 Long-term debt, net $ 1,083.9 $ 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. Effective 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 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 was locked at LIBOR plus 2.25 percent until the Company published its financial results for the fiscal quarter ended June 30, 2021, and it became 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. Interest on the New Notes is payable 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, 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, net "), and accrued and unpaid interest of $5.8 million (included in "Interest expense"). Also included in " Other expense, 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 September 30, 2021, there were $153.0 million in borrowings outstanding under the Revolving Facility. The remaining amount available for borrowings was $434.5 million (allowing for $12.5 million of letters of credit outstanding on that date). As of September 30, 2021, our Consolidated Leverage Ratio was approximately 3.8 to 1.00 versus our maximum covenant of 4.75 to 1.00.

Leases

Leases	9 Months Ended
	Sep. 30, 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 September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Operating lease cost $ 8.1 $ 6.7 $ 22.3 $ 21.0 Sublease income (0.9) (0.2) (1.5) (0.9) Total lease cost $ 7.2 $ 6.5 $ 20.8 $ 20.1 Other information related to leases was as follows: Nine Months Ended September 30, (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 $ 23.8 $ 21.5 Right-of-use assets obtained in exchange for lease obligations: Operating leases 15.0 3.3 As of September 30, 2021 Weighted average remaining lease term: Operating leases 6.15 years Weighted average discount rate: Operating leases 5.1 % Future minimum lease payments, net of sub-lease income, for all non-cancelable leases as of September 30, 2021, were as follows: (in millions) 2021 $ 6.9 2022 24.1 2023 18.3 2024 14.8 2025 12.0 2026 9.4 Thereafter 24.2 Total minimum lease payments 109.7 Less imputed interest 17.4 Future minimum payments for leases, net of sublease rental income and imputed interest $ 92.3

Pension and Other Retiree Benef

Pension and Other Retiree Benefits	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, Pension Post-retirement U.S. International (in millions) 2021 2020 2021 2020 2021 2020 Service cost $ — $ 0.4 $ 0.4 $ 0.4 $ — $ — Interest cost 1.2 1.5 1.5 2.4 — — Expected return on plan assets (2.9) (2.8) (4.7) (4.7) — — Amortization of net loss (gain) 0.9 0.8 1.7 1.3 (0.1) (0.1) Amortization of prior service cost — 0.1 0.1 0.1 — — Net periodic benefit cost (income) (1) $ (0.8) $ — $ (1.0) $ (0.5) $ (0.1) $ (0.1) Nine Months Ended September 30, Pension Post-retirement U.S. International (in millions) 2021 2020 2021 2020 2021 2020 Service cost $ 0.5 $ 1.2 $ 1.2 $ 1.1 $ — $ — Interest cost 3.4 4.4 4.7 7.2 — 0.1 Expected return on plan assets (8.5) (8.5) (14.5) (13.8) — — Amortization of net loss (gain) 2.7 2.4 5.3 3.7 (0.3) (0.4) Amortization of prior service cost 0.1 0.3 0.2 0.2 — — Curtailment loss (2) 1.4 — — — — — Net periodic benefit cost (income) (1) $ (0.4) $ (0.2) $ (3.1) $ (1.6) $ (0.3) $ (0.3) (1) The components of net periodic benefit cost (income), other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income. (2) Curtailment loss of $1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan. We expect to contribute approximately $22.8 million to our defined benefit plans in 2021. For the nine months ended September 30, 2021, we have contributed $16.4 million to these plans.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Stock option compensation expense $ 0.6 $ 0.5 $ 2.9 $ 2.1 RSU compensation expense 0.9 1.3 4.3 4.3 PSU compensation expense 1.7 — 5.0 (1.2) Total stock-based compensation expense $ 3.2 $ 1.8 $ 12.2 $ 5.2 We generally recognize compensation expense for stock-based awards ratably over the vesting period. Stock-based compensation expense for the three and nine months ended September 30, 2021 includes $0.2 million and $0.4 million of expense related to stock awards granted to eligible non-employee directors, respectively. For each of the three and nine months ended September 30, 2020, stock-based compensation expense includes $1.0 million of expense related to stock awards granted to non-employee directors. During the third quarter of 2021, stock compensation grants were made consisting of 4,773 stock options, 22,288 RSUs and 2,864 PSUs. The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of September 30, 2021: September 30, 2021 Unrecognized Weighted Average Compensation Years Expense To Be (in millions, except weighted average years) Expense Recognized Over Stock options $3.9 1.9 RSUs $4.3 1.7 PSUs $10.7 1.8

Inventories

Inventories	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Inventories	8. Inventories The components of inventories were as follows: (in millions) September 30, December 31, Raw materials $ 44.7 $ 36.8 Work in process 4.3 3.5 Finished goods 364.9 264.8 Total inventories $ 413.9 $ 305.1

Goodwill and Identifiable Intan

Goodwill and Identifiable Intangible Assets	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Identifiable Intangible Assets	9. Goodwill and Identifiable Intangible Assets Goodwill We test goodwill for impairment at least annually and on an interim basis if an event or circumstance indicates that it is more likely than not that an impairment loss has been incurred. Historically, we performed this annual test using June 30th as the measurement date. During the second quarter of 2021, we elected to change the measurement date of our annual impairment test from June 30th to May 31st. A measurement date of May 31st is preferable as it better aligns with the timing of our forecasting process. During the second quarter of 2021, we completed the annual goodwill impairment assessment, on a quantitative basis, for goodwill for each of our three reporting units. The result of our annual assessment was that the fair value of the North America, International and EMEA reporting units exceeded their carrying values as of our measurement date of May 31, 2021 and we concluded that no impairment existed. Estimating the fair value of each reporting unit requires us to make assumptions and estimates regarding our future. We utilized a combination of both a discounted cash flows and market approach. The financial projections used in the valuation models reflected management's assumptions regarding revenue growth rates, economic and market trends, cost structure, and other expectations about the anticipated short-term and long-term operating results for each of our three reporting units. In management’s opinion, the goodwill balance for the 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 changes in factors and assumptions which impact the fair value of the reporting unit such as low or declining revenue growth rates, depressed operating margins or adverse changes to the discount rates impacting this reporting unit. 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 Acquisitions (1) (14.5) 2.0 — (12.5) Foreign currency translation — (10.2) (0.5) (10.7) Balance at September 30, 2021 $ 446.7 $ 180.0 $ 177.5 $ 804.2 (1) Goodwill has been recorded on our Consolidated Balance Sheet related to the Franken acquisition, which is part of our EMEA segment, and represents the excess of the cost of the Franken acquisition when compared to the fair value estimate of the net assets acquired on April 1, 2021 (the date of the Franken acquisition). Goodwill has been recorded on our Consolidated Balance Sheet related to the PowerA Acquisition and represents the excess of the cost of the PowerA Acquisition when compared to the fair value estimate of the net assets acquired on December 17, 2020 (the date of the PowerA Acquisition) and includes a working capital adjustment of $18.2 million recorded in the first quarter of 2021 as a reduction to the purchase price, partially offset by purchase accounting adjustments of $3.7 million. See "Note 3. Acquisitions" for details on the calculation of the goodwill acquired in the PowerA Acquisition. The goodwill balance includes $215.1 million of accumulated impairment losses, which occurred prior to December 31, 2016. Identifiable Intangible Assets PowerA Acquisition The valuation of identifiable intangible assets of $235.4 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 128.6 15 years Vendor relationships 82.4 15 years Developed technology 2.8 5 years Total identifiable intangibles acquired $ 235.4 Intangible Assets The gross carrying value and accumulated amortization by class of identifiable intangible assets as of September 30, 2021 and December 31, 2020, were as follows: September 30, 2021 December 31, 2020 (in millions) Gross Accumulated Net Gross Accumulated Net Indefinite-lived intangible assets: Trade names $ 420.5 $ (44.5) (1) $ 376.0 $ 467.5 $ (44.5) (1) $ 423.0 Amortizable intangible assets: Trade names 375.7 (107.2) 268.5 343.5 (97.7) 245.8 Customer and contractual relationships 368.7 (177.4) 191.3 376.8 (162.9) 213.9 Vendor relationships 82.4 (4.6) 77.8 87.7 (0.2) 87.5 Patents 8.6 (2.8) 5.8 8.9 (2.1) 6.8 Subtotal 835.4 (292.0) 543.4 816.9 (262.9) 554.0 Total identifiable intangibles $ 1,255.9 $ (336.5) $ 919.4 $ 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 for the three and nine months ended September 30, 2021 was $11.6 million and $35.2 million, respectively, and $7.9 million and $24.1 million for the three and nine months ended September 30, 2020, respectively. Estimated amortization expense for amortizable intangible assets, as of September 30, 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) $ 47.1 $ 43.9 $ 41.5 $ 39.8 $ 38.1 $ 35.8 (2) Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events. We test indefinite-lived intangibles for impairment at least annually 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 quantitative basis, for our indefinite-lived trade names and concluded that no impairment existed as of our measurement date of May 31, 2021. The result of our impairment testing of our indefinite-lived intangible assets determined the fair value of our five indefinite-lived trade names ACCO Brands ® , Five Star ® , Swingline ® , Leitz ® and Tilibra ® exceeded their carrying values. The fair value of these trade names are considered Level 3 measurements which utilize a relief-from-royalty discounted cash flows approach. Key inputs and assumptions involved include the estimated near-term revenue growth, long-term growth rate, royalty rate, and discount rate. As of May 31, 2021, we changed the indefinite-lived Tilibra ® trade name to an amortizable intangible asset. The change was made as a result of decisions regarding the Company's future use of the trade name. The Company began amortizing the Tilibra ® trade name on a straight-line basis over a life of 30 years effective June 1, 2021.

Restructuring

Restructuring	9 Months Ended
	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Restructuring	10. Restructuring The Company recorded $4.2 million and $7.3 million of restructuring expense for the nine months ended September 30, 2021 and 2020, respectively, and recorded $0.3 million and $0.5 million for the three months ended September 30, 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 nine months ended September 30, 2021, was as follows: (in millions) Balance at December 31, 2020 Provision Cash Non-cash Balance at September 30, 2021 Employee termination costs (1) $ 8.1 $ 3.8 $ (8.0) $ (0.1) $ 3.8 Termination of lease agreements (2) 1.0 0.3 (0.9) 0.6 1.0 Other 0.2 0.1 (0.2) (0.1) — Total restructuring liability $ 9.3 $ 4.2 $ (9.1) $ 0.4 $ 4.8 (1) We expect the remaining $3.8 million employee termination costs to be substantially paid in the next nine months. (2) We expect the remaining $1.0 million lease termination costs to be substantially paid in the next nine months. The summary of the activity in the restructuring liability for the nine months ended September 30, 2020, was as follows: (in millions) Balance at December 31, 2019 Provision Cash Non-cash Balance at September 30, 2020 Employee termination costs $ 10.7 $ 6.7 $ (8.4) $ (0.1) $ 8.9 Termination of lease agreements 0.6 0.1 (0.5) — 0.2 Other 0.5 0.5 (0.5) (0.4) 0.1 Total restructuring liability $ 11.8 $ 7.3 $ (9.4) $ (0.5) $ 9.2

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	11. Income Taxes For the three months ended September 30, 2021, we recorded an income tax expense of $10.0 million on income before taxes of $30.2 million, for an effective rate of 33.1 percent . For the three months ended September 30, 2020, we recorded an income tax expense of $6.8 million on income before taxes of $25.6 million, for an effective rate of 26.6 percent. The increase in the effective rate versus the three months ended September 30, 2020 was primarily driven by an increase in the global intangible low-taxed income tax. For the nine months ended September 30, 2021, we recorded an income tax expense of $5.8 million on income before taxes of $54.2 million , for an effective rate of 10.7 percent. For the nine months ended September 30, 2020, we recorded an income tax expense of $13.7 million on income before taxes of $45.9 million, for an effective rate of 29.8 percent. The decrease in the effective rate versus the nine months ended September 30, 2020 was primarily driven by the revaluation of the deferred tax assets due to enacted statutory tax rate changes and the release of non-U.S. reserves for unrecognized tax benefits for which the time to assess has lapsed. 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 (2017 forward), Brazil (2015 forward), Canada (2017 forward), Germany (2016 forward), Sweden (2016 forward) and the U.K. (2019 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 decided to challenge this adverse decision in the tax authority's lawsuit at the judicial level seeking to collect the tax when the collection action is filed. 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. In anticipation of the judicial challenge, we were required to provide security to guarantee payment of the First Assessment should we not prevail. We believe we have meritorious defenses and intend to vigorously contest both of the Brazil Tax Assessments; however, there can be no assurances that we will ultimately prevail. The ultimate outcome will not be determined until the Brazilian judicial process is complete, 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 September 30, 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

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings per Share	12. Earnings per Share Total outstanding shares as of September 30, 2021 and 2020, were 95.7 million and 94.5 million, respectively. Under our stock repurchase program, for the three and nine months ended September 30, 2021 and for the three months ended September 30, 2020, no shares were repurchased, and for the nine months ended September 30, 2020, we repurchased and retired 2.7 million shares. For the nine months ended September 30, 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 and nine months ended September 30, 2021 and 2020 was as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Weighted-average number of shares of common stock outstanding - basic 95.6 94.5 95.4 95.0 Stock options 0.2 — 0.1 0.1 Restricted stock units 1.5 1.1 1.5 1.1 Weighted-average shares and assumed conversions - diluted 97.3 95.6 97.0 96.2

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 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 Income." As of September 30, 2021 and December 31, 2020, we had cash flow foreign exchange contracts outstanding with a U.S. dollar equivalent notional value of $133.8 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, net" in the "Consolidated Statements of Income" and are largely offset by the change in the current translated value of the hedged item. The periods of the forward foreign exchange contracts correspond to the periods of the hedged transactions, with some relating to intercompany loans which extend beyond September 2022. As of September 30, 2021 and December 31, 2020, we had foreign exchange contracts outstanding with a U.S. dollar equivalent notional value of $93.1 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 September 30, 2021 and December 31, 2020: Fair Value of Derivative Instruments Derivative Assets Derivative Liabilities (in millions) Balance Sheet September 30, 2021 December 31, Balance Sheet September 30, 2021 December 31, Derivatives designated as hedging instruments: Foreign exchange contracts Other current assets $ 5.1 $ 0.1 Other current liabilities $ 0.1 $ 5.0 Derivatives not designated as hedging instruments: Foreign exchange contracts Other current assets 0.4 1.6 Other current liabilities 0.7 1.2 Foreign exchange contracts Other non-current assets 16.3 32.1 Other non-current liabilities 16.3 32.1 Total derivatives $ 21.8 $ 33.8 $ 17.1 $ 38.3 The following tables summarize the pre-tax effect of our derivative financial instruments on the condensed consolidated financial statements for the three and nine months ended September 30, 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 September 30, Three Months Ended September 30, (in millions) 2021 2020 2021 2020 Cash flow hedges: Foreign exchange contracts $ 3.9 $ (2.1) Cost of products sold $ (0.5) $ 1.3 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 Nine Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Cash flow hedges: Foreign exchange contracts $ 7.3 $ 0.3 Cost of products sold $ 2.3 $ (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 Amount of (Gain) Loss Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Foreign exchange contracts Other expense, net $ 0.3 $ 2.8 $ 0.3 $ (2.4)

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 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 September 30, 2021 and December 31, 2020: (in millions) September 30, December 31, Assets: Forward currency contracts $ 21.8 $ 33.8 Liabilities: Forward currency contracts $ 17.1 $ 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 $1,130.1 million and $1,136.6 million and the estimated fair value of total debt was $1,173.2 million and $1,146.9 million at September 30, 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 nine months ended September 30, 2021: (in millions) Contingent Consideration Balance at December 31, 2020 $ 18.2 Change in fair value 16.5 Balance at September 30, 2021 $ 34.7

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 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 5.0 (18.6) 3.6 (10.0) Amounts reclassified from accumulated other comprehensive income, net of tax 1.7 — 7.1 8.8 Balance at September 30, 2021 $ 3.6 $ (337.4) $ (231.6) $ (565.4) The reclassifications out of AOCI for the three and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in millions) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) 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 $ 0.5 $ (1.3) $ (2.3) $ 1.2 Cost of products sold Tax (expense) benefit (0.2) 0.5 0.6 (0.3) Income tax expense Net of tax $ 0.3 $ (0.8) $ (1.7) $ 0.9 Defined benefit plan items: Amortization of actuarial loss $ (2.5) $ (2.0) $ (7.7) $ (5.7) (1) Amortization of prior service cost (0.1) (0.2) (1.7) (0.5) (1) Total before tax (2.6) (2.2) (9.4) (6.2) Tax benefit 0.7 0.6 2.3 1.3 Income tax expense Net of tax $ (1.9) $ (1.6) $ (7.1) $ (4.9) Total reclassifications for the period, net of tax $ (1.6) $ (2.4) $ (8.8) $ (4.0) (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

Revenue Recognition	9 Months Ended
	Sep. 30, 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 products are 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 and nine months ended September 30, 2021, $0.4 million and $2.1 million of the unearned revenue was earned and recognized, respectively. As of September 30, 2021, the amount of unearned revenue from EMAs was $2.5 million. We expect to earn and recognize approximately $2.1 million of the unearned amount in the next 12 months and $0.4 million in periods beyond the next 12 months. The following tables present our net sales disaggregated by regional geography (1) , by reporting business segments and our net sales disaggregated by the timing of revenue recognition for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 United States $ 253.9 $ 203.5 $ 685.5 $ 562.5 Canada 33.6 35.0 85.9 75.5 ACCO Brands North America 287.5 238.5 771.4 638.0 ACCO Brands EMEA (2) 161.1 136.4 475.0 352.2 Australia/N.Z. 35.3 31.7 96.8 83.6 Latin America 30.8 27.5 72.2 90.8 Asia-Pacific 12.0 10.0 39.6 30.5 ACCO Brands International 78.1 69.2 208.6 204.9 Net sales $ 526.7 $ 444.1 $ 1,455.0 $ 1,195.1 (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 September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Product and services transferred at a point in time $ 515.4 $ 431.1 $ 1,416.0 $ 1,148.5 Product and services transferred over time 11.3 13.0 39.0 46.6 Net sales $ 526.7 $ 444.1 $ 1,455.0 $ 1,195.1

Information on Business Segment

Information on Business Segments	9 Months Ended
	Sep. 30, 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 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 and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 ACCO Brands North America $ 287.5 $ 238.5 $ 771.4 $ 638.0 ACCO Brands EMEA 161.1 136.4 475.0 352.2 ACCO Brands International 78.1 69.2 208.6 204.9 Net sales $ 526.7 $ 444.1 $ 1,455.0 $ 1,195.1 Operating income by business segment for the three and nine months ended September 30, 2021 and 2020 was as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 ACCO Brands North America $ 34.6 $ 22.9 $ 87.7 $ 67.9 ACCO Brands EMEA 13.4 16.7 40.1 26.9 ACCO Brands International 7.3 3.7 10.7 5.2 Segment operating income 55.3 43.3 138.5 100.0 Change in fair value of contingent consideration (4.9) — (16.5) — Corporate (11.8) (9.0) (34.6) (29.8) Operating income (1) 38.6 34.3 87.4 70.2 Interest expense 11.2 10.2 36.0 28.7 Interest income (0.6) (0.2) (1.2) (0.8) Non-operating pension income (2.3) (1.4) (5.6) (4.4) Other expense, net 0.1 0.1 4.0 0.8 Income before income tax $ 30.2 $ 25.6 $ 54.2 $ 45.9 (1) Operating income 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	9 Months Ended
	Sep. 30, 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 May 2021, the Supreme Court of Brazil issued its final ruling in a leading case related to the computation of certain indirect taxes which provides that the indirect tax base should not include the gross amount of the value-added tax known as “ICMS.” The Supreme Court further ruled that taxpayers can recognize future operating credits ("Tax Credits") for excess indirect tax payments from past periods due to the inclusion of ICMS in the indirect tax base to the extent the taxpayer had filed judicial challenges seeking to recover excess tax payments prior to March 15, 2017 and for any excess tax payments made after March 15, 2017. Tilibra, one of our Brazilian subsidiaries, filed legal actions requesting recovery of these excess tax payments by way of future Tax Credits covering various time periods prior to March 15, 2017. Some of these cases have been finally decided in a court of law in favor of Tilibra, while others are still pending a final decision which we expect to issue in the future based on the Supreme Court decision. In the second quarter, the Company recorded Tax Credits in the amount of $9.1 million with respect to the finally decided cases as Other income, net. In addition, the recording of the Tax Credits resulted in additional income tax expense of $3.1 million. Final decisions in the remaining legal actions Tilibra has filed will result in additional Tax Credits, and the amount of these Tax Credits, in the aggregate, may be material. 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.

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Purchase Price Allocation to the Fair Value of Assets Acquired and Liabilities Assumed	The following table presents the 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 29.3 Property and equipment 0.2 Identifiable intangibles 235.4 Other assets 13.2 Fair value of assets acquired $ 278.1 Goodwill $ 71.1
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 and nine months ended September 30, 2021 and 2020 w ould have been as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Net sales $ 526.7 $ 501.4 $ 1,455.0 $ 1,325.5 Net income 20.2 24.9 48.4 41.6 Net income per diluted common share $ 0.21 $ 0.26 $ 0.50 $ 0.43

Long-Term Debt and Short-Term_2

Long-Term Debt and Short-Term Borrowings (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2021 and December 31, 2020: (in millions) September 30, December 31, Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.25% at September 30, 2021) $ 264.3 $ — 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 2.38% at September 30, 2021) 90.2 — 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 2.32% at September 30, 2021) 39.5 — 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 2.33% at September 30, 2021) 120.4 — 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 September 30, 2021) 32.6 — 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 8.1 5.7 Total debt 1,130.1 1,136.6 Less: Current portion 36.2 76.5 Debt issuance costs, unamortized 10.0 5.5 Long-term debt, net $ 1,083.9 $ 1,054.6
Schedule of Maximum Consolidated Leverage Ratio	further amend the maximum Consolidated Leverage Ratio financial covenant 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 Consolidated Leverage Ratio under Amended Credit Agreement	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)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Components of Lease Expense and Other Information	The components of lease expense were as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Operating lease cost $ 8.1 $ 6.7 $ 22.3 $ 21.0 Sublease income (0.9) (0.2) (1.5) (0.9) Total lease cost $ 7.2 $ 6.5 $ 20.8 $ 20.1 Other information related to leases was as follows: Nine Months Ended September 30, (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 $ 23.8 $ 21.5 Right-of-use assets obtained in exchange for lease obligations: Operating leases 15.0 3.3 As of September 30, 2021 Weighted average remaining lease term: Operating leases 6.15 years Weighted average discount rate: Operating leases 5.1 %
Future Minimum Lease Payments	Future minimum lease payments, net of sub-lease income, for all non-cancelable leases as of September 30, 2021, were as follows: (in millions) 2021 $ 6.9 2022 24.1 2023 18.3 2024 14.8 2025 12.0 2026 9.4 Thereafter 24.2 Total minimum lease payments 109.7 Less imputed interest 17.4 Future minimum payments for leases, net of sublease rental income and imputed interest $ 92.3

Pension and Other Retiree Ben_2

Pension and Other Retiree Benefits (Tables)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, Pension Post-retirement U.S. International (in millions) 2021 2020 2021 2020 2021 2020 Service cost $ — $ 0.4 $ 0.4 $ 0.4 $ — $ — Interest cost 1.2 1.5 1.5 2.4 — — Expected return on plan assets (2.9) (2.8) (4.7) (4.7) — — Amortization of net loss (gain) 0.9 0.8 1.7 1.3 (0.1) (0.1) Amortization of prior service cost — 0.1 0.1 0.1 — — Net periodic benefit cost (income) (1) $ (0.8) $ — $ (1.0) $ (0.5) $ (0.1) $ (0.1) Nine Months Ended September 30, Pension Post-retirement U.S. International (in millions) 2021 2020 2021 2020 2021 2020 Service cost $ 0.5 $ 1.2 $ 1.2 $ 1.1 $ — $ — Interest cost 3.4 4.4 4.7 7.2 — 0.1 Expected return on plan assets (8.5) (8.5) (14.5) (13.8) — — Amortization of net loss (gain) 2.7 2.4 5.3 3.7 (0.3) (0.4) Amortization of prior service cost 0.1 0.3 0.2 0.2 — — Curtailment loss (2) 1.4 — — — — — Net periodic benefit cost (income) (1) $ (0.4) $ (0.2) $ (3.1) $ (1.6) $ (0.3) $ (0.3) (1) The components of net periodic benefit cost (income), other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income. (2) Curtailment loss of $1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Stock option compensation expense $ 0.6 $ 0.5 $ 2.9 $ 2.1 RSU compensation expense 0.9 1.3 4.3 4.3 PSU compensation expense 1.7 — 5.0 (1.2) Total stock-based compensation expense $ 3.2 $ 1.8 $ 12.2 $ 5.2
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 September 30, 2021: September 30, 2021 Unrecognized Weighted Average Compensation Years Expense To Be (in millions, except weighted average years) Expense Recognized Over Stock options $3.9 1.9 RSUs $4.3 1.7 PSUs $10.7 1.8

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Components of Inventory	The components of inventories were as follows: (in millions) September 30, December 31, Raw materials $ 44.7 $ 36.8 Work in process 4.3 3.5 Finished goods 364.9 264.8 Total inventories $ 413.9 $ 305.1

Goodwill and Identifiable Int_2

Goodwill and Identifiable Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 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 Acquisitions (1) (14.5) 2.0 — (12.5) Foreign currency translation — (10.2) (0.5) (10.7) Balance at September 30, 2021 $ 446.7 $ 180.0 $ 177.5 $ 804.2 (1) Goodwill has been recorded on our Consolidated Balance Sheet related to the Franken acquisition, which is part of our EMEA segment, and represents the excess of the cost of the Franken acquisition when compared to the fair value estimate of the net assets acquired on April 1, 2021 (the date of the Franken acquisition). Goodwill has been recorded on our Consolidated Balance Sheet related to the PowerA Acquisition and represents the excess of the cost of the PowerA Acquisition when compared to the fair value estimate of the net assets acquired on December 17, 2020 (the date of the PowerA Acquisition) and includes a working capital adjustment of $18.2 million recorded in the first quarter of 2021 as a reduction to the purchase price, partially offset by purchase accounting adjustments of $3.7 million. See "Note 3. Acquisitions" for details on the calculation of the goodwill acquired in the PowerA Acquisition.
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 September 30, 2021 and December 31, 2020, were as follows: September 30, 2021 December 31, 2020 (in millions) Gross Accumulated Net Gross Accumulated Net Indefinite-lived intangible assets: Trade names $ 420.5 $ (44.5) (1) $ 376.0 $ 467.5 $ (44.5) (1) $ 423.0 Amortizable intangible assets: Trade names 375.7 (107.2) 268.5 343.5 (97.7) 245.8 Customer and contractual relationships 368.7 (177.4) 191.3 376.8 (162.9) 213.9 Vendor relationships 82.4 (4.6) 77.8 87.7 (0.2) 87.5 Patents 8.6 (2.8) 5.8 8.9 (2.1) 6.8 Subtotal 835.4 (292.0) 543.4 816.9 (262.9) 554.0 Total identifiable intangibles $ 1,255.9 $ (336.5) $ 919.4 $ 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 September 30, 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) $ 47.1 $ 43.9 $ 41.5 $ 39.8 $ 38.1 $ 35.8 (2) Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events.
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 128.6 15 years Vendor relationships 82.4 15 years Developed technology 2.8 5 years Total identifiable intangibles acquired $ 235.4

Restructuring (Tables)

Restructuring (Tables)	9 Months Ended
	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Summary of Activity in Restructuring Accounts	The summary of the activity in the restructuring liability for the nine months ended September 30, 2021, was as follows: (in millions) Balance at December 31, 2020 Provision Cash Non-cash Balance at September 30, 2021 Employee termination costs (1) $ 8.1 $ 3.8 $ (8.0) $ (0.1) $ 3.8 Termination of lease agreements (2) 1.0 0.3 (0.9) 0.6 1.0 Other 0.2 0.1 (0.2) (0.1) — Total restructuring liability $ 9.3 $ 4.2 $ (9.1) $ 0.4 $ 4.8 (1) We expect the remaining $3.8 million employee termination costs to be substantially paid in the next nine months. (2) We expect the remaining $1.0 million lease termination costs to be substantially paid in the next nine months. The summary of the activity in the restructuring liability for the nine months ended September 30, 2020, was as follows: (in millions) Balance at December 31, 2019 Provision Cash Non-cash Balance at September 30, 2020 Employee termination costs $ 10.7 $ 6.7 $ (8.4) $ (0.1) $ 8.9 Termination of lease agreements 0.6 0.1 (0.5) — 0.2 Other 0.5 0.5 (0.5) (0.4) 0.1 Total restructuring liability $ 11.8 $ 7.3 $ (9.4) $ (0.5) $ 9.2

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	The number of our weighted-average shares outstanding for the three and nine months ended September 30, 2021 and 2020 was as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Weighted-average number of shares of common stock outstanding - basic 95.6 94.5 95.4 95.0 Stock options 0.2 — 0.1 0.1 Restricted stock units 1.5 1.1 1.5 1.1 Weighted-average shares and assumed conversions - diluted 97.3 95.6 97.0 96.2

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2021 and December 31, 2020: Fair Value of Derivative Instruments Derivative Assets Derivative Liabilities (in millions) Balance Sheet September 30, 2021 December 31, Balance Sheet September 30, 2021 December 31, Derivatives designated as hedging instruments: Foreign exchange contracts Other current assets $ 5.1 $ 0.1 Other current liabilities $ 0.1 $ 5.0 Derivatives not designated as hedging instruments: Foreign exchange contracts Other current assets 0.4 1.6 Other current liabilities 0.7 1.2 Foreign exchange contracts Other non-current assets 16.3 32.1 Other non-current liabilities 16.3 32.1 Total derivatives $ 21.8 $ 33.8 $ 17.1 $ 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 and nine months ended September 30, 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 September 30, Three Months Ended September 30, (in millions) 2021 2020 2021 2020 Cash flow hedges: Foreign exchange contracts $ 3.9 $ (2.1) Cost of products sold $ (0.5) $ 1.3 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 Nine Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Cash flow hedges: Foreign exchange contracts $ 7.3 $ 0.3 Cost of products sold $ 2.3 $ (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 Amount of (Gain) Loss Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Foreign exchange contracts Other expense, net $ 0.3 $ 2.8 $ 0.3 $ (2.4)

Fair Value Of Financial Instr_2

Fair Value Of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2021 and December 31, 2020: (in millions) September 30, December 31, Assets: Forward currency contracts $ 21.8 $ 33.8 Liabilities: Forward currency contracts $ 17.1 $ 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 nine months ended September 30, 2021: (in millions) Contingent Consideration Balance at December 31, 2020 $ 18.2 Change in fair value 16.5 Balance at September 30, 2021 $ 34.7

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 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 5.0 (18.6) 3.6 (10.0) Amounts reclassified from accumulated other comprehensive income, net of tax 1.7 — 7.1 8.8 Balance at September 30, 2021 $ 3.6 $ (337.4) $ (231.6) $ (565.4)
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)	The reclassifications out of AOCI for the three and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in millions) Amount Reclassified from Accumulated Other Comprehensive Income (Loss) 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 $ 0.5 $ (1.3) $ (2.3) $ 1.2 Cost of products sold Tax (expense) benefit (0.2) 0.5 0.6 (0.3) Income tax expense Net of tax $ 0.3 $ (0.8) $ (1.7) $ 0.9 Defined benefit plan items: Amortization of actuarial loss $ (2.5) $ (2.0) $ (7.7) $ (5.7) (1) Amortization of prior service cost (0.1) (0.2) (1.7) (0.5) (1) Total before tax (2.6) (2.2) (9.4) (6.2) Tax benefit 0.7 0.6 2.3 1.3 Income tax expense Net of tax $ (1.9) $ (1.6) $ (7.1) $ (4.9) Total reclassifications for the period, net of tax $ (1.6) $ (2.4) $ (8.8) $ (4.0) (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 (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables present our net sales disaggregated by regional geography (1) , by reporting business segments and our net sales disaggregated by the timing of revenue recognition for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 United States $ 253.9 $ 203.5 $ 685.5 $ 562.5 Canada 33.6 35.0 85.9 75.5 ACCO Brands North America 287.5 238.5 771.4 638.0 ACCO Brands EMEA (2) 161.1 136.4 475.0 352.2 Australia/N.Z. 35.3 31.7 96.8 83.6 Latin America 30.8 27.5 72.2 90.8 Asia-Pacific 12.0 10.0 39.6 30.5 ACCO Brands International 78.1 69.2 208.6 204.9 Net sales $ 526.7 $ 444.1 $ 1,455.0 $ 1,195.1 (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 September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Product and services transferred at a point in time $ 515.4 $ 431.1 $ 1,416.0 $ 1,148.5 Product and services transferred over time 11.3 13.0 39.0 46.6 Net sales $ 526.7 $ 444.1 $ 1,455.0 $ 1,195.1

Information on Business Segme_2

Information on Business Segments (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Schedule of Net Sales by Reporting Segments	Net sales by reportable business segment for the three and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 ACCO Brands North America $ 287.5 $ 238.5 $ 771.4 $ 638.0 ACCO Brands EMEA 161.1 136.4 475.0 352.2 ACCO Brands International 78.1 69.2 208.6 204.9 Net sales $ 526.7 $ 444.1 $ 1,455.0 $ 1,195.1
Schedule of Operating Income by Reporting Segment	Operating income by business segment for the three and nine months ended September 30, 2021 and 2020 was as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 ACCO Brands North America $ 34.6 $ 22.9 $ 87.7 $ 67.9 ACCO Brands EMEA 13.4 16.7 40.1 26.9 ACCO Brands International 7.3 3.7 10.7 5.2 Segment operating income 55.3 43.3 138.5 100.0 Change in fair value of contingent consideration (4.9) — (16.5) — Corporate (11.8) (9.0) (34.6) (29.8) Operating income (1) 38.6 34.3 87.4 70.2 Interest expense 11.2 10.2 36.0 28.7 Interest income (0.6) (0.2) (1.2) (0.8) Non-operating pension income (2.3) (1.4) (5.6) (4.4) Other expense, net 0.1 0.1 4.0 0.8 Income before income tax $ 30.2 $ 25.6 $ 54.2 $ 45.9 (1) Operating income 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) € in Millions, $ in Millions	Apr. 01, 2021USD ($)	Apr. 01, 2021EUR (€)	Dec. 17, 2020USD ($)	Sep. 30, 2021USD ($)
PowerA
Business Acquisition [Line Items]
Purchase price, net of working capital adjustment			$ 321.8
Additional earnout (up to)			$ 55
Additional earnout				$ 34.7
Franken
Business Acquisition [Line Items]
Purchase price, net of working capital adjustment	$ 2.8	€ 2.4
Cash acquired	$ 1.1

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) € in Millions, $ in Millions	Apr. 01, 2021USD ($)	Apr. 01, 2021EUR (€)	Dec. 17, 2020USD ($)reportingUnit	Sep. 30, 2021USD ($)	Jun. 30, 2021reportingUnit	Mar. 31, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Business Acquisition [Line Items]
Number of reporting units | reportingUnit			3		3
Working capital adjustment						$ (18.2)
Revenues				$ 526.7			$ 444.1	$ 1,455	$ 1,195.1
Goodwill				804.2				804.2		$ 827.4
Franken
Business Acquisition [Line Items]
Preliminary purchase price	$ 2.8	€ 2.4
Cash acquired	$ 1.1
PowerA
Business Acquisition [Line Items]
Preliminary purchase price			$ 321.8
Additional earnout (up to)			55
Additional earnout				34.7				34.7
Revenues				$ 56.8				170.2
Goodwill			$ 71.1
PowerA | Selling, General and Administrative Expenses
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	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 804.2	$ 827.4
PowerA
Business Acquisition [Line Items]
Purchase price, net of working capital adjustment	$ 321.8
Fair value of contingent consideration	18.2	$ 34.7	$ 18.2
Accrued liabilities	9.2
Fair value of liabilities assumed	9.2
Inventory	29.3
Property and equipment	0.2
Identifiable intangibles	235.4
Other assets	13.2
Fair value of assets acquired	278.1
Goodwill	$ 71.1

Acquisitions (Pro Forma) (Detai

Acquisitions (Pro Forma) (Details) - PowerA - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Net sales	$ 526.7	$ 501.4	$ 1,455	$ 1,325.5
Net income	$ 20.2	$ 24.9	$ 48.4	$ 41.6
Net income per diluted share (in USD per share)	$ 0.21	$ 0.26	$ 0.50	$ 0.43

Long-Term Debt and Short-Term_3

Long-Term Debt and Short-Term Borrowings (Notes Payable and Long-term Debt) (Details) - USD ($)	Sep. 30, 2021	Mar. 15, 2021	Dec. 31, 2020	May 23, 2019
Debt Instrument [Line Items]
Total debt	$ 1,130,100,000		$ 1,136,600,000
Current portion	36,200,000		76,500,000
Debt issuance costs, unamortized	10,000,000		5,500,000
Long-term debt, net	1,083,900,000		1,054,600,000
Other borrowings
Debt Instrument [Line Items]
Total debt	8,100,000		5,700,000
Senior Secured Notes | Euro Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.25% at September 30, 2021)
Debt Instrument [Line Items]
Total debt	$ 264,300,000		0
Floating interest rate (percent)	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		$ 287,400,000
Floating interest rate (percent)			2.50%
Senior Secured Notes | USD Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.38% at September 30, 2021)
Debt Instrument [Line Items]
Total debt	$ 90,200,000		$ 0
Floating interest rate (percent)	2.38%
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		$ 92,500,000	$ 100,000,000
Floating interest rate (percent)			3.50%
Senior Secured Notes | Australian Dollar Senior Secured Term Loan A, due March 2026 (floating interest rate of 2.32% at September 30, 2021)
Debt Instrument [Line Items]
Total debt	$ 39,500,000		$ 0
Floating interest rate (percent)	2.32%
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		$ 43,400,000
Floating interest rate (percent)			2.57%
Senior Secured Notes | U.S. Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 2.33% at September 30, 2021)
Debt Instrument [Line Items]
Total debt	$ 120,400,000		$ 0
Floating interest rate (percent)	2.33%
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		$ 307,200,000
Floating interest rate (percent)			3.50%
Senior Secured Notes | Australian Dollar Senior Secured Revolving Credit Facility, due March 2026 (floating interest rate of 2.31% at September 30, 2021)
Debt Instrument [Line Items]
Total debt	$ 32,600,000		$ 0
Floating interest rate (percent)	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		$ 25,400,000
Floating interest rate (percent)			2.57%
Senior Notes | Senior Unsecured Notes, due March 2029 (fixed interest rate of 4.25%)
Debt Instrument [Line Items]
Total debt	$ 575,000,000		$ 0
Stated interest rate (percent)	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		$ 375,000,000
Stated interest rate (percent)	5.25%	5.25%

Long-Term Debt and Short-Term_4

Long-Term Debt and Short-Term Borrowings (Narrative) (Details)

Mar. 15, 2021USD ($)

Jul. 26, 2018USD ($)

Jan. 27, 2017USD ($)

Sep. 30, 2021USD ($)

Jun. 30, 2021

Mar. 31, 2021USD ($)

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

$ 1,130,100,000

$ 1,136,600,000

Write-off of debt issuance costs

$ 3,700,000

Secured Debt | Senior Secured Credit Facility Due January 2022

Debt Instrument [Line Items]

Consolidated leverage ratio (including share repurchases and dividends)

2.50

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

Debt Instrument [Line Items]

Fixed coverage ratio

1.25

Secured Debt | Revolving Facility

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 400,000,000

Secured Debt | Senior Secured Credit Facility Due May 2024

Debt Instrument [Line Items]

Maximum consolidated leverage ratio

3.75

4.75

3.75

Cash and cash equivalents of the loan parties

$ 100,000,000

Capitalized bank, legal and other fees

$ 3,200,000

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

Debt Instrument [Line Items]

Interest coverage ratio

3

Secured Debt | Senior Secured Credit Facility Due March 2026

Debt Instrument [Line Items]

Maximum consolidated leverage ratio

4

Secured Debt | Senior Secured Credit Facility Due March 2026 | London Interbank Offered Rate (LIBOR)

Debt Instrument [Line Items]

Basis spread on variable rate (percent)

2.25%

Senior Secured Credit Facility Due January 2022

Debt Instrument [Line Items]

Debt instrument, term

5 years

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

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 500,000,000

$ 500,000,000

Increase in aggregate revolving credit commitment

$ 100,000,000

Euro Term Loan A | Secured Debt

Debt Instrument [Line Items]

Debt instrument, face amount

$ 320,800,000

€ 300,000,000

AUD Term Loan A | Secured Debt

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 60,400,000

$ 80,000,000

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

Debt Instrument [Line Items]

Total debt

$ 0

92,500,000

$ 100,000,000

Senior Secured Credit Facility Due March 2026 | Secured Debt

Debt Instrument [Line Items]

Consolidated leverage ratio

3.8

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

Debt Instrument [Line Items]

Total debt

$ 0

375,000,000

Stated interest rate (percent)

5.25%

5.25%

Repayments of outstanding borrowings

$ 178,000,000

Aggregate redemption price

$ 390,600,000

Redemption price, principal

375,000,000

Redemption price, call premium

9,800,000

Redemption price, accrued and unpaid interest

$ 5,800,000

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

Debt Instrument [Line Items]

Debt instrument, face amount

575,000,000

Total debt

$ 575,000,000

$ 0

Capitalized bank, legal and other fees

$ 8,200,000

Stated interest rate (percent)

4.25%

4.25%

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

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 600,000,000

Total debt

$ 153,000,000

Amount available for borrowings under Senior Secured Revolving Credit Facilities

434,500,000

Letters of credit outstanding

$ 12,500,000

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

Debt Instrument [Line Items]

Consolidated leverage ratio (including share repurchases and dividends)

3.25

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 March 2026 - Secured Debt	Mar. 15, 2021	Nov. 10, 2020
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 March 2026	9 Months Ended
	Sep. 30, 2021
> 4.50 to 1.00
Debt Instrument [Line Items]
Undrawn fee (percent)	0.50%
≤ 4.50 to 1.00 and > 4.00 to 1.00
Debt Instrument [Line Items]
Undrawn fee (percent)	0.375%
≤ 4.00 to 1.00 and > 3.50 to 1.00
Debt Instrument [Line Items]
Undrawn fee (percent)	0.35%
≤ 3.50 to 1.00 and > 3.00 to 1.00
Debt Instrument [Line Items]
Undrawn fee (percent)	0.30%
≤ 3.00 to 1.00 and > 2.00 to 1.00
Debt Instrument [Line Items]
Undrawn fee (percent)	0.25%
≤ 2.00 to 1.00
Debt Instrument [Line Items]
Undrawn fee (percent)	0.20%
Applicable Rate on Euro/AUD/CDN Dollar Loans | > 4.50 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2.50%
Applicable Rate on Euro/AUD/CDN Dollar Loans | ≤ 4.50 to 1.00 and > 4.00 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2.25%
Applicable Rate on Euro/AUD/CDN Dollar Loans | ≤ 4.00 to 1.00 and > 3.50 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2.00%
Applicable Rate on Euro/AUD/CDN Dollar Loans | ≤ 3.50 to 1.00 and > 3.00 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.75%
Applicable Rate on Euro/AUD/CDN Dollar Loans | ≤ 3.00 to 1.00 and > 2.00 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.50%
Applicable Rate on Euro/AUD/CDN Dollar Loans | ≤ 2.00 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.25%
Applicable Rate on Base Rate Loans | > 4.50 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.50%
Applicable Rate on Base Rate Loans | ≤ 4.50 to 1.00 and > 4.00 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.25%
Applicable Rate on Base Rate Loans | ≤ 4.00 to 1.00 and > 3.50 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.00%
Applicable Rate on Base Rate Loans | ≤ 3.50 to 1.00 and > 3.00 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.75%
Applicable Rate on Base Rate Loans | ≤ 3.00 to 1.00 and > 2.00 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.50%
Applicable Rate on Base Rate Loans | ≤ 2.00 to 1.00
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.25%

Leases (Lease Expense) (Details

Leases (Lease Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease cost	$ 8.1	$ 6.7	$ 22.3	$ 21
Sublease income	(0.9)	(0.2)	(1.5)	(0.9)
Total lease cost	$ 7.2	$ 6.5	$ 20.8	$ 20.1

Leases (Other Information) (Det

Leases (Other Information) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating cash flows from operating leases	$ 23.8	$ 21.5
Right-of-use assets obtained in exchange for lease obligations:	$ 15	$ 3.3
Weighted average remaining lease term, operating leases (in years)	6 years 1 month 24 days
Weighted average discount rate, operating leases (as a percentage)	5.10%

Leases (Future Minimum Lease Pa

Leases (Future Minimum Lease Payments) (Details) $ in Millions	Sep. 30, 2021USD ($)
Leases [Abstract]
2021	$ 6.9
2022	24.1
2023	18.3
2024	14.8
2025	12
2026	9.4
Thereafter	24.2
Total minimum lease payments	109.7
Less imputed interest	17.4
Future minimum payments for leases, net of sublease rental income and imputed interest	$ 92.3

Pension and Other Retiree Ben_3

Pension and Other Retiree Benefits (Net Periodic Benefit Expense) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to defined benefit plans for 2021		$ 22.8		$ 22.8
Contributions by company to date				16.4
Pension | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost		0	$ 0.4	0.5		$ 1.2
Interest cost		1.2	1.5	3.4		4.4
Expected return on plan assets		(2.9)	(2.8)	(8.5)		(8.5)
Amortization of net loss (gain)		0.9	0.8	2.7		2.4
Amortization of prior service cost		0	0.1	0.1		0.3
Curtailment loss				1.4	[1]	0
Net periodic benefit cost (income)	[2]	(0.8)	0	(0.4)		(0.2)
Pension | International
Defined Benefit Plan Disclosure [Line Items]
Service cost		0.4	0.4	1.2		1.1
Interest cost		1.5	2.4	4.7		7.2
Expected return on plan assets		(4.7)	(4.7)	(14.5)		(13.8)
Amortization of net loss (gain)		1.7	1.3	5.3		3.7
Amortization of prior service cost		0.1	0.1	0.2		0.2
Curtailment loss				0		0
Net periodic benefit cost (income)	[2]	(1)	(0.5)	(3.1)		(1.6)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost		0	0	0		0
Interest cost		0	0	0		0.1
Expected return on plan assets		0	0	0		0
Amortization of net loss (gain)		(0.1)	(0.1)	(0.3)		(0.4)
Amortization of prior service cost		0	0	0		0
Curtailment loss				0		0
Net periodic benefit cost (income)	[2]	$ (0.1)	$ (0.1)	$ (0.3)		$ (0.3)
[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 of net periodic benefit cost (income), other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income.

Stock-Based Compensation (Share

Stock-Based Compensation (Share-based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 3.2	$ 1.8	$ 12.2	$ 5.2
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	0.6	0.5	2.9	2.1
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	0.9	1.3	4.3	4.3
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 1.7	$ 0	$ 5	$ (1.2)

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 3.2	$ 1.8	$ 12.2	$ 5.2
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.6	0.5	2.9	2.1
Stock options granted in period (shares)	4,773
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.9	1.3	4.3	4.3
Equity instruments other than options granted in period (shares)	22,288
Restricted stock units | Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 0.2	1	0.4	1
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income)	$ 1.7	$ 0	$ 5	$ (1.2)
Equity instruments other than options granted in period (shares)	2,864

Stock-Based Compensation (Unrec

Stock-Based Compensation (Unrecognized Compensation Expense) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense	$ 3.9
Weighted Average Years Expense To Be Recognized Over	1 year 10 months 24 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense	$ 4.3
Weighted Average Years Expense To Be Recognized Over	1 year 8 months 12 days
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense	$ 10.7
Weighted Average Years Expense To Be Recognized Over	1 year 9 months 18 days

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 44.7	$ 36.8
Work in process	4.3	3.5
Finished goods	364.9	264.8
Total inventories	$ 413.9	$ 305.1

Goodwill and Identifiable Int_3

Goodwill and Identifiable Intangible Assets (Goodwill) (Details) $ in Millions	Dec. 17, 2020USD ($)reportingUnit	Jun. 30, 2021reportingUnit	Mar. 31, 2021USD ($)	Sep. 30, 2021USD ($)	May 31, 2021USD ($)	Dec. 31, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of reporting units | reportingUnit	3	3
Goodwill, accumulated impairment losses					$ 0	$ 215.1
Goodwill [Roll Forward]
Balance at December 31, 2020			$ 827.4	$ 827.4
Acquisitions				(12.5)
Foreign currency translation				(10.7)
Balance at September 30, 2021				804.2
Working capital adjustment			(18.2)
Purchase accounting adjustments			3.7
PowerA
Goodwill [Roll Forward]
Balance at September 30, 2021	$ 71.1
ACCO Brands North America
Goodwill [Roll Forward]
Balance at December 31, 2020			461.2	461.2
Acquisitions				(14.5)
Foreign currency translation				0
Balance at September 30, 2021				446.7
ACCO Brands EMEA
Goodwill [Roll Forward]
Balance at December 31, 2020			188.2	188.2
Acquisitions				2
Foreign currency translation				(10.2)
Balance at September 30, 2021				180
ACCO Brands International
Goodwill [Roll Forward]
Balance at December 31, 2020			$ 178	178
Acquisitions				0
Foreign currency translation				(0.5)
Balance at September 30, 2021				$ 177.5

Goodwill and Identifiable Int_4

Goodwill and Identifiable Intangible Assets (Acquired Finite-Lived Intangibles) (Details) - USD ($) $ in Millions	Jun. 01, 2021	Sep. 30, 2021	Dec. 17, 2020
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	30 years
PowerA
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles			$ 235.4
PowerA | Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles			21.6
Finite-lived intangible asset, useful life		15 years
PowerA | Customer and contractual relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles			128.6
Finite-lived intangible asset, useful life		15 years
PowerA | Vendor Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles			82.4
Finite-lived intangible asset, useful life		15 years
PowerA | 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 Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	Jun. 01, 2021	Sep. 30, 2021	Dec. 17, 2020
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	30 years
PowerA
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles			$ 235.4
PowerA | Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles			21.6
Finite-lived intangible asset, useful life		15 years
PowerA | Customer and contractual relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles			128.6
Finite-lived intangible asset, useful life		15 years
PowerA | Vendor Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangibles			82.4
Finite-lived intangible asset, useful life		15 years
PowerA | 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_6

Goodwill and Identifiable Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		$ 835.4	$ 816.9
Amortizable intangible assets, Accumulated Amortization		(292)	(262.9)
Amortizable intangible assets, Net Book Value		543.4	554
Total identifiable intangibles, Gross Carrying Amounts		1,255.9	1,284.4
Total identifiable intangibles, Accumulated Amortization		(336.5)	(307.4)
Total identifiable intangibles, Net Book Value		919.4	977
Trade Names
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		375.7	343.5
Amortizable intangible assets, Accumulated Amortization		(107.2)	(97.7)
Amortizable intangible assets, Net Book Value		268.5	245.8
Customer and contractual relationships
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		368.7	376.8
Amortizable intangible assets, Accumulated Amortization		(177.4)	(162.9)
Amortizable intangible assets, Net Book Value		191.3	213.9
Vendor Relationships
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		82.4	87.7
Amortizable intangible assets, Accumulated Amortization		(4.6)	(0.2)
Amortizable intangible assets, Net Book Value		77.8	87.5
Patents
Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amounts		8.6	8.9
Amortizable intangible assets, Accumulated Amortization		(2.8)	(2.1)
Amortizable intangible assets, Net Book Value		5.8	6.8
Trade Names
Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross carrying amount		420.5	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		$ 376	$ 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_7

Goodwill and Identifiable Intangible Assets (Estimated Amortization Expense) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangibles		$ 11.6	$ 7.9	$ 35.2	$ 24.1
Estimated amortization expense, 2021	[1]	47.1		47.1
Estimated amortization expense, 2022	[1]	43.9		43.9
Estimated amortization expense, 2023	[1]	41.5		41.5
Estimated amortization expense, 2024	[1]	39.8		39.8
Estimated amortization expense, 2025	[1]	38.1		38.1
Estimated amortization expense, 2026	[1]	$ 35.8		$ 35.8
[1]	Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events.

Goodwill and Identifiable Int_8

Goodwill and Identifiable Intangible Assets - Change to Trade Names (Details) - USD ($)	Jun. 01, 2021	May 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of indefinite-lived trade names		$ 0
Tilibra Trade Name
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	30 years

Restructuring (Restructuring Ch

Restructuring (Restructuring Charges and Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021		Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period				$ 9.3		$ 11.8
Provision	$ 0.3		$ 0.5	4.2		7.3
Cash Expenditures				(9.1)		(9.4)
Non-cash Items/ Currency Change				0.4		(0.5)
Balance at End of Period	4.8		9.2	4.8		9.2
Employee termination costs
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period				8.1		10.7
Provision				3.8		6.7
Cash Expenditures				(8)		(8.4)
Non-cash Items/ Currency Change				(0.1)		(0.1)
Balance at End of Period	3.8	[1]	8.9	$ 3.8	[1]	8.9
Payment period for restructuring costs				9 months
Termination of lease agreements
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period				$ 1		0.6
Provision				0.3		0.1
Cash Expenditures				(0.9)		(0.5)
Non-cash Items/ Currency Change				0.6		0
Balance at End of Period	1	[2]	0.2	$ 1	[2]	0.2
Payment period for restructuring costs				9 months
Other
Restructuring Reserve [Roll Forward]
Balance at Beginning of Period				$ 0.2		0.5
Provision				0.1		0.5
Cash Expenditures				(0.2)		(0.5)
Non-cash Items/ Currency Change				(0.1)		(0.4)
Balance at End of Period	$ 0		$ 0.1	$ 0		$ 0.1
[1]	(1) We expect the remaining $3.8 million employee termination costs to be substantially paid in the next nine months.
[2]	(2) We expect the remaining $1.0 million lease termination costs to be substantially paid in the next nine months.

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Mar. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2012
Income Tax Examination [Line Items]
Income tax expense	$ 10		$ 6.8		$ 5.8	$ 13.7
Income before income tax	$ 30.2		$ 25.6		$ 54.2	$ 45.9
Effective rate (percent)	33.10%		26.60%		10.70%	29.80%
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					2017
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Income Tax Examination [Line Items]
Income tax expense		$ 3.1
Income tax examination, interest expense					$ 0.3	$ 0.3
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Minimum
Income Tax Examination [Line Items]
Penalty rate	75.00%				75.00%
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 2008 to 2010
Income Tax Examination [Line Items]
Additional reserve from a prior period			$ 1.2	$ 5.6
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
Potential tax adjustment related to related to acquisition purchase price							$ 43.3
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007 | Maximum
Income Tax Examination [Line Items]
Penalty rate	150.00%				150.00%
Foreign Tax Authority | Canada Revenue Agency | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year					2017
Foreign Tax Authority | Federal Ministry of Finance, Germany | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year					2016
Foreign Tax Authority | Swedish Tax Agency (Skatteverket) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year					2016
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC) | Earliest Tax Year
Income Tax Examination [Line Items]
Open tax year					2019
Foreign Tax Authority | Other Noncurrent Liabilities | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007 to 2010
Income Tax Examination [Line Items]
Unrecognized tax benefits	$ 27.3				$ 27.3
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

Earnings per Share (Details)

Earnings per Share (Details) - shares	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items]
Common stock outstanding (in shares)	95,700,000	94,500,000		95,700,000	94,500,000
Common stock repurchases (shares)	0	0	2,690,292	0	2,700,000
Shares related to tax withholding for share-based compensation (in shares)				100,000	200,000
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted-average number of common shares outstanding - basic (in shares)	95,600,000	94,500,000		95,400,000	95,000,000
Weighted-average number of common shares outstanding - diluted (in shares)	97,300,000	95,600,000		97,000,000	96,200,000
Potentially dilutive shares excluded from computation of dilutive earnings per share (in shares)	8,000,000	8,000,000		8,000,000	7,500,000
Stock options
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Incremental dilutive common shares (in shares)	200,000	0		100,000	100,000
Restricted stock units
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Incremental dilutive common shares (in shares)	1,500,000	1,100,000		1,500,000	1,100,000

Derivative Financial Instrume_3

Derivative Financial Instruments (Narrative) (Details) - Foreign exchange contracts - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives not designated as hedging instruments
Derivative [Line Items]
U.S. dollar equivalent notional value	$ 93.1	$ 164.7
Cash Flow Hedging | Derivatives designated as hedging instruments
Derivative [Line Items]
U.S. dollar equivalent notional value	$ 133.8	$ 134.3

Derivative Financial Instrume_4

Derivative Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 21.8	$ 33.8
Derivative Liabilities	17.1	38.3
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	5.1	0.1
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0.1	5
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0.4	1.6
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0.7	1.2
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	16.3	32.1
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 16.3	$ 32.1

Derivative Financial Instrume_5

Derivative Financial Instruments (Effect of Derivative Instruments) (Details) - Foreign exchange contracts - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Cost of products sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)	$ (0.5)	$ 1.3	$ 2.3	$ (1.2)
Derivatives not designated as hedging instruments | Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Income	0.3	2.8	0.3	(2.4)
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI (Effective Portion)	$ 3.9	$ (2.1)	$ 7.3	$ 0.3

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	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Foreign currency contracts, assets	$ 21.8	$ 33.8
Foreign currency contracts, liabilities	$ 17.1	$ 38.3

Fair Value of Financial Instr_4

Fair Value of Financial Instruments Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt	$ 1,130.1	$ 1,136.6
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of total debt	$ 1,173.2	$ 1,146.9

Fair Value of Financial Instr_5

Fair Value of Financial Instruments (Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 17, 2020
Contingent Consideration [Roll Forward]
Change in fair value	$ 4.9	$ 0	$ 16.5	$ 0
PowerA
Contingent Consideration [Roll Forward]
Additional earnout (up to)					$ 55
Balance at December 31, 2020			18.2
Change in fair value			16.5
Balance at September 30, 2021	$ 34.7		$ 34.7

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Rollforward) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	$ 742.7
Other comprehensive income (loss) before reclassifications, net of tax	(10)
Amounts reclassified from accumulated other comprehensive income, net of tax	8.8
Balance at end of period	785
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	(564.2)
Balance at end of period	(565.4)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	(3.1)
Other comprehensive income (loss) before reclassifications, net of tax	5
Amounts reclassified from accumulated other comprehensive income, net of tax	1.7
Balance at end of period	3.6
Foreign Currency Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	(318.8)
Other comprehensive income (loss) before reclassifications, net of tax	(18.6)
Amounts reclassified from accumulated other comprehensive income, net of tax	0
Balance at end of period	(337.4)
Unrecognized Pension and Other Post-retirement Benefit Costs
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at start of period	(242.3)
Other comprehensive income (loss) before reclassifications, net of tax	3.6
Amounts reclassified from accumulated other comprehensive income, net of tax	7.1
Balance at end of period	$ (231.6)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold		$ (369.5)			$ (317)			$ (1,018.2)	$ (845.8)
Income tax (expense) benefit		(10)			(6.8)			(5.8)	(13.7)
Net income		20.2	$ 48.6	$ (20.4)	18.8	$ 5.4	$ 8	48.4	32.2
Income before income tax		30.2			25.6			54.2	45.9
Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net income		(1.6)			(2.4)			(8.8)	(4)
Unrecognized Pension and Other Post-retirement Benefit Costs | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit		0.7			0.6			2.3	1.3
Net income		(1.9)			(1.6)			(7.1)	(4.9)
Amortization of actuarial loss	[1]	(2.5)			(2)			(7.7)	(5.7)
Amortization of prior service cost	[1]	(0.1)			(0.2)			(1.7)	(0.5)
Income before income tax		(2.6)			(2.2)			(9.4)	(6.2)
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		0.5			(1.3)			(2.3)	1.2
Income tax (expense) benefit		(0.2)			0.5			0.6	(0.3)
Net income		$ 0.3			$ (0.8)			$ (1.7)	$ 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	Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Unearned revenue associated with outstanding contracts	$ 2.5	$ 3

Revenue Recognition (Unearned R

Revenue Recognition (Unearned Revenue) (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2021USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognized	$ 0.4	$ 2.1
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	$ 2.1	$ 2.1
Expected timing of satisfaction	12 months	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unearned revenue	$ 0.4	$ 0.4
Expected timing of satisfaction	12 months	12 months

Revenue Recognition (Schedule o

Revenue Recognition (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales		$ 526.7	$ 444.1	$ 1,455	$ 1,195.1
Product and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Net sales		515.4	431.1	1,416	1,148.5
Product and services transferred over time
Disaggregation of Revenue [Line Items]
Net sales		11.3	13	39	46.6
ACCO Brands North America
Disaggregation of Revenue [Line Items]
Net sales		287.5	238.5	771.4	638
ACCO Brands North America | United States
Disaggregation of Revenue [Line Items]
Net sales		253.9	203.5	685.5	562.5
ACCO Brands North America | Canada
Disaggregation of Revenue [Line Items]
Net sales		33.6	35	85.9	75.5
ACCO Brands EMEA
Disaggregation of Revenue [Line Items]
Net sales	[1]	161.1	136.4	475	352.2
ACCO Brands International
Disaggregation of Revenue [Line Items]
Net sales		78.1	69.2	208.6	204.9
ACCO Brands International | Australia/N.Z.
Disaggregation of Revenue [Line Items]
Net sales		35.3	31.7	96.8	83.6
ACCO Brands International | Latin America
Disaggregation of Revenue [Line Items]
Net sales		30.8	27.5	72.2	90.8
ACCO Brands International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Net sales		$ 12	$ 10	$ 39.6	$ 30.5
[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		9 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)segment	Sep. 30, 2020USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment			3
Net sales	$ 526.7	$ 444.1	$ 1,455	$ 1,195.1
ACCO Brands North America
Segment Reporting Information [Line Items]
Net sales	287.5	238.5	771.4	638
ACCO Brands EMEA
Segment Reporting Information [Line Items]
Net sales	161.1	136.4	475	352.2
ACCO Brands International
Segment Reporting Information [Line Items]
Net sales	$ 78.1	$ 69.2	$ 208.6	$ 204.9

Information on Business Segme_4

Information on Business Segments (Operating Income by Segment) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Segment Reporting Information [Line Items]
Operating income	[1]	$ 38.6	$ 34.3	$ 87.4		$ 70.2
Change in fair value of contingent consideration		(4.9)	0	(16.5)		0
Interest expense		11.2	10.2	36		28.7
Interest income		(0.6)	(0.2)	(1.2)		(0.8)
Non-operating pension income		(2.3)	(1.4)	(5.6)		(4.4)
Other expense, net		0.1	0.1	4		0.8
Income before income tax		30.2	25.6	54.2		45.9
Operating Segment
Segment Reporting Information [Line Items]
Operating income		55.3	43.3	138.5	[1]	100	[1]
Corporate
Segment Reporting Information [Line Items]
Operating income		(11.8)	(9)	(34.6)	[1]	(29.8)	[1]
ACCO Brands North America | Operating Segment
Segment Reporting Information [Line Items]
Operating income		34.6	22.9	87.7	[1]	67.9	[1]
ACCO Brands EMEA | Operating Segment
Segment Reporting Information [Line Items]
Operating income		13.4	16.7	40.1	[1]	26.9	[1]
ACCO Brands International | Operating Segment
Segment Reporting Information [Line Items]
Operating income		$ 7.3	$ 3.7	$ 10.7	[1]	$ 5.2	[1]
[1]	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			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Loss Contingencies [Line Items]
Income tax expense	$ 10		$ 6.8	$ 5.8	$ 13.7
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Loss Contingencies [Line Items]
Brazil Tax Credits		$ 9.1
Income tax expense		$ 3.1