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Assets Held For Sale and Asset Restructuring Costs
3 Months Ended
Mar. 31, 2022
Restructuring and Related Activities [Abstract]  
Assets Held For Sale and Asset Restructuring Costs Assets Held For Sale and Asset Restructuring Costs 
2021 Appleton Mill Closure
On June 28, 2021, the Company's Board of Directors approved the permanent closure of the manufacturing facility in Appleton, Wisconsin (the “Appleton Mill”) used in the Technical Products segment. The closure of the facility was substantially complete as of September 30, 2021. In connection with the closure, the Company reduced the carrying value of these assets from the net book value of $43.0 million to an estimated salvage value, which resulted in a non-cash impairment loss of $32.4 million ($24.3 million, net of tax). The salvage value was determined using third-party appraisal estimates based on observable market inputs (Level 2). In addition, the Company recorded $5.0 million of other restructuring charges, including reserves for obsolescence of inventory and environmental exposure, severance costs and a curtailment loss on the pension obligations of the terminated workers. Further, the Company incurred a charge of $2.9 million relating to the loss of certain deferred income tax benefits.

During the third quarter of 2021, the Company initiated a process to market for sale the Appleton Mill ("disposal group"). The contemplated disposal transaction does not constitute a strategic shift in the business that will have a major effect on operations of the Company. The disposal group was measured at the lower of carrying value and fair value (a Level 2 measurement, based on observable market inputs), less costs to sell. As of March 31, 2022, the disposal group of assets of $10.5 million (consisting of property, plant and equipment) was separately reported as Assets held for sale in the Condensed Consolidated Balance Sheet. In addition, an estimated environmental liability of $0.5 million was reported separately as Liabilities of assets held for sale in the Condensed Consolidated Balance Sheet as of March 31, 2022. For the three months ended March 31, 2022, the Company incurred $0.6 million of asset restructuring costs related to the closure and sale of the facility.