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Strategic Transformation and Restructuring, Impairment and Other Asset Charges
 12 Months Ended
Dec. 31, 2021
Restructuring and Related Activities [Abstract]  
Strategic Transformation and Restructuring, Impairment and Other Asset Charges Strategic Transformation and Restructuring, Impairment and Other Asset ChargesIn 2018, the Company made several strategic decisions to divest of underperforming manufacturing sites or product lines, including to close certain of its subsidiaries, close and sell its manufacturing sites and relocate the product lines manufactured at each of these sites to other Company locations; exit the oil, gas and water well product lines; and sell certain assets. These actions, which have subsequently been incorporated into the Company's Simplify, Focus and Grow Strategic Transformation ("SFG") initiative beginning in 2019, generally include facility rationalization, asset impairment, workforce reduction and the associated costs of organizational integration activities. The Company has incurred $13.4 million of incremental costs for the SFG initiative in 2021, which are recorded in "Selling, general and administrative expenses" in the Consolidated Statements of Operations. In addition, the Company periodically sells or disposes of its assets in the normal course of its business operations as they are no longer needed or used and may incur gains or losses on these disposals. Certain of the costs associated with these decisions are separately identified as restructuring. The Company reports asset impairment charges and gains or losses on the sales of property and equipment collectively, with restructuring charges in "Restructuring, impairment and other asset charges, net" in the Consolidated Statements of Operations. The Company incurred costs for these activities of $2.5 million, $8.1 million and $3.2 million in 2021, 2020 and 2019, respectively.
The restructuring, asset impairment charges and net gain on sale of property and equipment incurred in 2021, 2020 and 2019 are as follows:

Years Ended December 31,
(in millions)202120202019
Restructuring related charges:
Costs associated with closing Tacoma$1.6 $0.9 $— 
Costs associated with closing Enid0.7 2.5 — 
Costs associated with closing Mequon0.6 3.3 — 
Costs associated with closing Albuquerque— 1.3 — 
Costs associated with closing AMM— 0.3 1.3 
Costs associated with exiting the wood pellet business— — 0.5 
Workforce reductions at multiple sites— 1.3 1.1 
Other restructuring charges— 0.3 — 
Total restructuring related charges2.9 9.9 2.9 
Asset impairment charges:
Airplane impairment charges— 2.3 0.3 
Goodwill impairment charges— 1.6 — 
Other impairment charges0.2 0.5 — 
Total asset impairment charges0.2 4.4 0.3 
Gain on sale of property and equipment, net:
Gain on sale of property and equipment, net(0.6)(6.2)— 
Total gain on sale of property and equipment, net(0.6)(6.2)— 
Restructuring, impairment and other asset charges, net$2.5 $8.1 $3.2 

Restructuring charges by segment are as follows:

Years Ended December 31,
(in millions)202120202019
Infrastructure Solutions$2.4 $6.2 $2.9 
Materials Solutions0.5 3.6 — 
Corporate— 0.1 — 
Total restructuring related charges$2.9 $9.9 $2.9 

Impairment charges by segment are as follows:

Years Ended December 31,
(in millions)202120202019
Infrastructure Solutions$— $1.9 $— 
Materials Solutions0.2 (0.2)0.3 
Corporate— 2.7 — 
Total impairment charges$0.2 $4.4 $0.3 

The net gain on sale of property and equipment by segment are as follows:

Years Ended December 31,
(in millions)202120202019
Infrastructure Solutions$(0.5)$(1.5)$— 
Materials Solutions(0.1)(4.7)— 
Total gain on sale of property and equipment, net$(0.6)$(6.2)$— 

Restructuring charges accrued, but not paid, were $1.2 million and $1.1 million as of December 31, 2021 and December 31, 2020, respectively.
In late 2018, it was determined that AMM did not meet the desired performance metrics, and the decision was made to close this site. Documents were filed by the Company in the German court system in December 2018 to begin the process of liquidating AMM. Essentially all of the assets were liquidated prior to December 31, 2019, with the exception of the sale of its land and building, which were included in assets held for sale and valued at $0.3 million in the Consolidated Balance Sheets at December 31, 2019 and sold in January 2020. Losses on the liquidation are included in "Restructuring, impairment and other asset charges, net" in the Consolidated Statement of Operations for the year ended December 31, 2020. The sale of AMM's land and building was completed in January 2020 and the resulting gain on sale of fixed assets of $0.7 million was recorded in "Restructuring, impairment and other asset charges, net" in the Consolidated Statements of Operations during the first quarter of 2020.

On October 21, 2019, the Company announced the closing of its Albuquerque, New Mexico location. The decision to close the site was based in part on market conditions and manufacturing facility underutilization. The marketing and manufacturing of products previously produced by the site were transferred to other Company facilities. The site was closed as of March 31, 2020. The site's land, building and leasehold improvements, which were included in assets held for sale and valued at $2.8 million in the Consolidated Balance Sheets as of December 31, 2019, were sold in the third quarter of 2020 for $3.2 million. The resulting $0.4 million gain was recorded in "Restructuring, impairment and other asset charges, net" in the Consolidated Statements of Operations during the third quarter of 2020.

In late 2019, the oil and gas drilling product lines produced at the Enid, Oklahoma location were impaired and discontinued. The remaining assets were sold in the third quarter of 2020 for $1.1 million, which is reported in "Other (expenses) income, net" in the Consolidated Statements of Operations. Additional restructuring costs of $0.7 million were incurred during 2021. Enid's land and building assets totaling $5.1 million are included in "Assets held for sale" in the Consolidated Balance Sheets at December 31, 2021 and December 31, 2020.

In June 2020, the Company announced the closing of the Mequon site in order to simplify and consolidate operations. The Mequon facility ceased production operations in August 2020, and the sale of the land and building for $8.5 million was completed in December 2020. The Company recorded a gain on the sale of $4.7 million, which was recorded in "Restructuring, impairment and other asset charges, net" in the Consolidated Statements of Operations during the fourth quarter of 2020. Charges primarily related to production facility transition activities of $0.6 million were incurred during 2021.

In October 2020, the Company closed a transaction for the sale of water well assets of the Company's Enid location, which included equipment, inventories and intangible assets. The purchase price for this transaction was approximately $6.9 million, net of purchase price adjustments completed in January 2021 whereby the Company had an obligation to pay the buyer $1.1 million. This obligation is included in "Other current liabilities" in the Consolidated Balance Sheets at December 31, 2020. The Company recorded a $0.5 million gain on the sale of this business in the fourth quarter of 2020 in "Other (expenses) income, net" in the Consolidated Statements of Operations.

In January 2021, the Company announced plans to close the Tacoma facility in order to simplify and consolidate operations. The Tacoma facility ceased manufacturing operations at the end of 2021. The transfer of the manufacturing and marketing of the Tacoma product lines to other facilities within the Infrastructure Solutions segment is expected to be completed during early 2022. In conjunction with this action, the Company recorded $0.9 million of restructuring related charges during the fourth quarter of 2020 in "Restructuring, impairment and other asset charges, net" in the Consolidated Statements of Operations. Additional restructuring charges of $1.6 million were incurred during 2021 primarily associated with severance and retention costs.