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Goodwill
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
The Company tests goodwill for impairment annually on October 1, or more frequently should circumstances change or events occur that would more likely than not reduce the fair value of a reporting unit below its carrying value between annual impairment tests. During the second quarter of 2024, the Company identified that indicators of goodwill impairment were present due to macroeconomic conditions at the time, including declines in the Company's publicly quoted share price and increased interest rates, as well as lower than expected operating results. These factors indicated that one or more of the Company's reporting
units may have fallen below their carrying amounts. Management elected to perform a qualitative assessment on all reporting units, and the Company concluded that a further quantitative analysis was required for the Materials Solutions reporting unit.

The Company determined the fair value of the Materials Solutions reporting unit using an equally weighted combination of the discounted cash flow method, a form of the income approach, and the guideline public company method, a form of the market approach. The significant assumptions used under the discounted cash flow method are projected net sales, projected earnings before interest, tax, depreciation and amortization ("EBITDA"), terminal growth rates, and the cost of capital. Projected net sales, projected EBITDA and terminal growth rates were determined to be significant assumptions because they are primary drivers of the projected cash flows in the discounted cash flow fair value model. Cost of capital was also determined to be a significant assumption as it is the discount rate used to calculate the current fair value of those projected cash flows. The Company calculates the discount rate based on a market-participant, risk-adjusted weighted average cost of capital, which considers industry specific rates of return on debt and equity capital for a target industry capital structure, adjusted for risks associated with business size, geography and other factors specific to the reporting unit. A change in the discount rate, as a result of a change in economic conditions or otherwise, could result in the carrying value of the reporting unit exceeding its fair value. For the guideline public company method, significant assumptions relate to the selection of appropriate guideline companies and related valuation multiples used in the market analysis.

Based on the quantitative impairment test, the Company determined that the carrying value of the Materials Solutions reporting unit exceeded its fair value as of June 30, 2024. As a result, the Company recognized a pretax non-cash goodwill impairment charge of $20.2 million in "Goodwill impairment" in the Consolidated Statements of Operations to fully impair the goodwill allocated to the Materials Solutions reporting unit.

The Company completed the Acquisition during the three months ended September 30, 2025, which increased goodwill $85.1 million.

The changes in the carrying amount of goodwill and accumulated impairment losses by reporting segment during the nine months ended September 30, 2025 and the year ended December 31, 2024 are as follows:

(in millions)Infrastructure SolutionsMaterials SolutionsTotal
Balance, December 31, 2023:
Goodwill$48.0 $32.3 $80.3 
Accumulated impairment losses(21.8)(12.2)(34.0)
Net$26.2 $20.1 $46.3 
2024 Activity:
Foreign currency translation$(1.2)$0.1 $(1.1)
Impairment— (20.2)(20.2)
Total 2024 activity
$(1.2)$(20.1)$(21.3)
Balance, December 31, 2024:
Goodwill$46.8 $32.2 $79.0 
Accumulated impairment(21.8)(32.2)(54.0)
Net$25.0 $— $25.0 
2025 Activity:
Foreign currency translation$0.6 $(0.3)$0.3 
Acquisitions— 85.1 85.1 
Total 2025 activity
$0.6 $84.8 $85.4 
Balance, September 30, 2025:
Goodwill$47.4 $117.0 $164.4 
Accumulated impairment(21.8)(32.2)(54.0)
Net$25.6 $84.8 $110.4