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Intangible Assets, Goodwill and Other
6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure Goodwill and Intangibles
Changes in the carrying amounts of goodwill and intangible assets allocated to the pulp and paperboard segment as follows:
Pulp and Paperboard
GoodwillIntangiblesTotal
Balance as of December 31, 2023
35.1 6.4 41.5 
Recognized goodwill13.7 — 13.7 
  Amortization— (1.1)(1.1)
Balance as of June 30, 2024
$48.8 $5.4 $54.1 
Intangible assets consisted of $5.4 million customer relationships. Outstanding definite-lived intangible assets are amortized over their useful lives of 10 years.
The gross book value and accumulated amortization of definite lived intangible assets at June 30, 2024 was $34.9 million and $29.5 million. The gross book value and accumulated amortization of definite lived intangible assets at December 31, 2023 was $34.9 million and $28.4 million.