Unusual or Infrequently Occurring Items	3 Months Ended
Mar. 31, 2026
Unusual or Infrequent Items, or Both [Abstract]
Business Insurance Recoveries	INSURANCE RECOVERY In connection with the acquisition of a paperboard manufacturing facility and associated business, we obtained representation and warranty insurance, subject to exclusions, a policy limit of $105 million, and certain other terms and conditions, to cover losses resulting from a breach of representations and warranties warranties in the Asset Purchase Agreement made by Graphic Packaging International, LLC, a wholly owned subsidiary of Graphic Packaging Holding Company. We have notified the insurance carriers of alleged breaches of certain representations and warranties contained in the Asset Purchase Agreement. In July and November 2025, we submitted claims to the insurance carriers for losses arising of the alleged breaches. During the quarter ended March 31, 2026, we received a partial settlement of $17.5 million related to these claims, of which $5.6 million was related to reimbursable costs and recorded within "Cost of Sales" and $11.9 million related to other breaches and reported within "Other operating charges, net" in our Consolidated Statements of Operations. This recovery is in addition to the recovery of $23 million received in the fourth quarter of 2025.

In connection with the acquisition of a paperboard manufacturing facility and associated business, we obtained representation and warranty insurance, subject to exclusions, a policy limit of $105 million, and certain other terms and conditions, to cover losses resulting from a breach of representations and warranties warranties in the Asset Purchase Agreement made by Graphic Packaging International, LLC, a wholly owned subsidiary of Graphic Packaging Holding Company. We have notified the insurance carriers of alleged breaches of certain representations and warranties contained in the Asset Purchase Agreement. In July and November 2025, we submitted claims to the insurance carriers for losses arising of the alleged breaches. During the quarter ended March 31, 2026, we received a partial settlement of $17.5 million related to these claims, of which $5.6 million was related to reimbursable costs and recorded within "Cost of Sales" and $11.9 million related to other breaches and reported within "Other operating charges, net" in our Consolidated Statements of Operations. This recovery is in addition to the recovery of $23 million received in the fourth quarter of 2025.