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Goodwill and Identifiable Intangible Assets, net
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Identifiable Intangible Assets, net Goodwill and Identifiable Intangible Assets, net
Goodwill
The following table shows our goodwill balances by reportable segment. We review goodwill for impairment on a reporting unit basis annually during the fourth quarter of each year and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. The Company performed a quantitative assessment by reporting unit as of October 1, 2023. Based on the results of the quantitative assessment, which indicated a fair value in excess of carrying amount for each of the Company's designated reporting units, we concluded there was no impairment of goodwill. There have been no significant events or circumstances subsequent to the quantitative assessment performed as of October 1, 2023 that have indicated a potential for impairment.
Allocation of Goodwill to Reporting Segment
The following table shows our goodwill balances by reportable segment: 
(In millions)FoodProtectiveTotal
Gross Carrying Value at December 31, 2021$576.6 $1,803.0 $2,379.6 
Accumulated amortization(49.3)(140.9)(190.2)
Carrying Value at December 31, 2021$527.3 $1,662.1 $2,189.4 
Acquisition(1)
5.2 — 5.2 
Currency translation(9.6)(11.0)(20.6)
Gross Carrying Value at December 31, 2022$572.2 $1,792.0 $2,364.2 
Accumulated amortization(49.0)(140.7)(189.7)
Carrying Value at December 31, 2022$523.2 $1,651.3 $2,174.5 
Acquisition(2)
707.4 — 707.4 
Currency translation4.7 6.1 10.8 
Gross Carrying Value at December 31, 2023$1,284.3 $1,798.1 $3,082.4 
Accumulated amortization(3)
(49.1)(140.8)(189.9)
Carrying Value at December 31, 2023$1,235.2 $1,657.3 $2,892.5 
(1)Represents the allocation of goodwill related to our acquisition of Foxpak. See Note 5, "Acquisition and Divestiture Activity," for further details.
(2)Represents amounts allocated to goodwill resulting from acquisitions, primarily for Liquibox. See Note 5, "Acquisition and Divestiture Activity," for further details.
(3)The change in accumulated amortization from December 31, 2022 to December 31, 2023 is due to the impact of foreign currency translation.
As noted above, it was determined under a quantitative assessment that there was no impairment of goodwill. However, if we become aware of indicators of impairment in future periods, we may be required to perform an interim assessment for some or all of our reporting units before the next annual assessment. Examples of relevant factors we consider on an interim basis may include a decrease in expected net earnings, adverse market conditions, a decline in current market multiples, a decline in our common stock price, a significant adverse change in legal factors or business climates, an adverse action or assessment by a regulator, leadership changes, unanticipated competition, strategic decisions made in response to economic or competitive conditions, or a more likely than not expectation that a reporting unit or a significant portion of a reporting unit will be sold or disposed of. In the event that significant adverse changes lead to a decrease in the valuation of one or more of our reporting units, we may have to recognize a non-cash impairment of goodwill, which could have a material adverse effect on our consolidated financial condition and results of operations.
Identifiable Intangible Assets, net
The following tables summarize our identifiable intangible assets, net with definite and indefinite useful lives. As of December 31, 2023, there were no impairment indicators present. 
 December 31, 2023December 31, 2022
(In millions)Gross
Carrying
Value		Accumulated
Amortization		NetGross
Carrying
Value		Accumulated
Amortization		Net
Customer relationships$287.7 $(69.3)$218.4 $99.5 $(47.1)$52.4 
Trademarks and tradenames57.0 (19.4)37.6 30.8 (14.4)16.4 
Software148.2 (112.8)35.4 147.7 (111.3)36.4 
Technology197.5 (60.1)137.4 67.0 (44.3)22.7 
Contracts11.5 (10.2)1.3 11.4 (9.8)1.6 
Total intangible assets with definite lives701.9 (271.8)430.1 356.4 (226.9)129.5 
Trademarks and tradenames with indefinite lives8.9 — 8.9 8.9 — 8.9 
Total identifiable intangible assets, net$710.8 $(271.8)$439.0 $365.3 $(226.9)$138.4 
The following table shows the estimated future amortization expense at December 31, 2023. 
Year
Amount
(In millions)
2024$63.0 
202556.7 
202644.5 
202739.5 
202839.1 
Thereafter187.3 
Total$430.1 
 
Amortization expense was $62.7 million in 2023, $36.1 million in 2022 and $38.8 million in 2021.
The following table shows the remaining weighted average useful life of our definite lived intangible assets as of December 31, 2023. 
 Remaining weighted average useful lives
Customer relationships9.8
Trademarks and tradenames8.3
Software2.1
Technology10.2
Contracts3.8
Total identifiable intangible assets, net with definite lives9.2
Expected future cash flows associated with the Company's intangible assets are not expected to be materially affected by the Company's intent or ability to renew or extend the arrangements. Based on our experience with similar agreements, we expect to continue to renew contracts held as intangibles through the end of the remaining useful lives.