Goodwill and Identifiable Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Net Carrying Amount of Goodwill by Segment

Changes in the net carrying amount of goodwill by segment were as follows:

(in millions)	ACCO Brands Americas			ACCO Brands International			Total
Balance at December 31, 2023	$	383.6		$	206.4		$	590.0
Goodwill impairment		(127.5	)		—			(127.5	)
Foreign currency translation		(1.5	)		(9.7	)		(11.2	)
Balance at June 30, 2024	$	254.6		$	196.7		$	451.3

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 June 30, 2024 and December 31, 2023, were as follows:

	June 30, 2024							December 31, 2023
(in millions)	Gross Carrying Amounts		Accumulated Amortization			Net Book Value		Gross Carrying Amounts		Accumulated Amortization			Net Book Value
Indefinite-lived intangible assets:
Trade names(1)	$	101.2	$	(44.5	)	$	56.7	$	295.1	$	(44.5	)	$	250.6
Amortizable intangible assets:
Trade names(2)		639.8		(148.9	)		490.9		497.1		(142.0	)		355.1
Customer and contractual relationships		357.0		(226.4	)		130.6		362.4		(221.3	)		141.1
Vendor relationships		82.4		(19.5	)		62.9		82.4		(16.7	)		65.7
Patents		8.0		(5.4	)		2.6		8.2		(5.0	)		3.2
Subtotal		1,087.2		(400.2	)		687.0		950.1		(385.0	)		565.1
Total identifiable intangibles	$	1,188.4	$	(444.7	)	$	743.7	$	1,245.2	$	(429.5	)	$	815.7

(1)Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased.

(2)Reflects the change of two indefinite-lived trade names from indefinite-lived intangibles to amortizable intangible assets as of June 1, 2024.

Estimated Amortization Expense for Future Periods

Estimated amortization expense for amortizable intangible assets, as of June 30, 2024, for the current year and the next five years is as follows:

(in millions)	2024		2025		2026		2027		2028		2029
Estimated amortization expense(3)	$	45.1	$	45.7	$	43.6	$	41.2	$	39.0	$	37.2

(3)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.