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Acquisitions and Divestitures - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 24, 2026
USD ($)
Oct. 01, 2024
USD ($)
Aug. 26, 2024
USD ($)
Jul. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2025
USD ($)
numberOfBusinessesAcquired
businesses_divested
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
businesses_divested
Dec. 31, 2021
USD ($)
Jun. 17, 2025
USD ($)
Segment Reporting Information [Line Items]                    
Debt issuance costs           $ 0.8 $ 23.3 $ 2.0    
Contingent Consideration, Asset           2.2        
Purchase price           (17.6) 1,424.2 119.4    
Goodwill recorded, net           (12.3) 397.1 40.4    
Revenues           2,883.4 2,569.9 2,307.9    
Operating profit (loss)           341.9 197.6 217.3    
Acquisition holdback                 $ 15.0  
Goodwill           1,348.9 1,361.2      
(Gain) loss on sale of businesses           $ 14.7        
Difference between holdback settlement and amount accrued at acquisition               $ 5.0    
Number of Divestitures | businesses_divested           0   0    
Holdback payment from acquisition           $ 0.0 0.0 $ (10.0)    
Number of Acquisitions | numberOfBusinessesAcquired           0        
Steel components                    
Segment Reporting Information [Line Items]                    
(Gain) loss on sale of businesses             21.6      
Asphalt and other non-operating facility                    
Segment Reporting Information [Line Items]                    
Selling price of business             27.3      
(Gain) loss on sale of businesses             (12.5)      
Revolving credit facility | Revolving credit facility                    
Segment Reporting Information [Line Items]                    
Debt issuance costs             1.9      
Borrowings under revolving credit facility         $ 160.0     60.0    
Term Loan                    
Segment Reporting Information [Line Items]                    
Long-term debt, gross   $ 700.0       $ 536.5 700.0     $ 698.3
Term Loan | Revolving credit facility                    
Segment Reporting Information [Line Items]                    
Debt issuance costs           0.8 7.0      
Senior Notes due 2032                    
Segment Reporting Information [Line Items]                    
Debt issuance costs     $ 8.2              
Unsecured Debt | Senior Notes due 2032                    
Segment Reporting Information [Line Items]                    
Long-term debt, gross     $ 600.0     600.0 600.0      
Interest rate     6.875%              
Construction Products                    
Segment Reporting Information [Line Items]                    
Goodwill           848.8 861.2      
Engineered Structures                    
Segment Reporting Information [Line Items]                    
Goodwill           480.2 480.1      
Transportation Products                    
Segment Reporting Information [Line Items]                    
Goodwill           19.9 19.9      
Transportation Products | Steel components                    
Segment Reporting Information [Line Items]                    
Revenues             87.8 153.3    
Operating profit (loss)             (19.5) 11.0    
Selling price of business             55.0      
Transportation Products | Steel components | Combined Proceeds                    
Segment Reporting Information [Line Items]                    
Selling price of business             110.0      
Transportation Products | Steel components | Seller's Note                    
Segment Reporting Information [Line Items]                    
Selling price of business             25.0      
Transportation Products | Steel components | Earnout Receivable                    
Segment Reporting Information [Line Items]                    
Selling price of business             30.0      
Transportation Products | Inland barges                    
Segment Reporting Information [Line Items]                    
Revenues           383.3 329.8      
Operating profit (loss)           60.8 49.7      
Transportation Products | Inland barges | Subsequent Event                    
Segment Reporting Information [Line Items]                    
Selling price of business $ 450.0                  
Lake Point | Construction Products                    
Segment Reporting Information [Line Items]                    
Purchase price               $ 65.1    
Goodwill recorded, net             15.6      
Mineral Reserves             19.1      
Property, plant, and equipment, including mineral reserves             13.3      
Lake Point | Construction Products | Permits                    
Segment Reporting Information [Line Items]                    
Intangible asset             11.5      
Stavola                    
Segment Reporting Information [Line Items]                    
Revenues             78.2      
Operating profit (loss)             4.5      
Stavola | Construction Products                    
Segment Reporting Information [Line Items]                    
Business Acquisition, Transaction Costs             25.5      
Purchase price   $ 1,200.0       1,192.0        
Property, plant, and equipment, including mineral reserves           742.6        
Goodwill           339.3        
Inventories           23.5        
Receivables, net of allowance           69.2        
Cash Acquired from Acquisition           $ 17.6        
Stavola | Construction Products | Permits                    
Segment Reporting Information [Line Items]                    
Useful life of acquired intangible asset           20 years        
Stavola | Construction Products | Beneficial use rights                    
Segment Reporting Information [Line Items]                    
Useful life of acquired intangible asset           34 years        
Stavola | Construction Products | Trade names                    
Segment Reporting Information [Line Items]                    
Useful life of acquired intangible asset           5 years        
Ameron | Engineered Structures                    
Segment Reporting Information [Line Items]                    
Purchase price         $ 180.0          
Property, plant, and equipment, including mineral reserves             60.8      
Intangible asset             12.8      
Goodwill             42.3      
Inventories             18.1      
Receivables, net of allowance             12.0      
Ameron | Engineered Structures | Trademarks                    
Segment Reporting Information [Line Items]                    
Trademarks             8.9      
Ameron | Engineered Structures | Customer relationships                    
Segment Reporting Information [Line Items]                    
Intangible asset             $ 25.6      
Aggregates, Phoenix | Construction Products                    
Segment Reporting Information [Line Items]                    
Purchase price       $ 35.0