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Acquisitions and Divestitures - Purchase price allocation (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 01, 2024
Jun. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2021
Business Combination [Line Items]            
Goodwill     $ 1,348.9 $ 1,361.2    
Purchase price     (17.6) 1,424.2 $ 119.4  
Goodwill recorded, net     (12.3) 397.1 40.4  
Acquisition holdback           $ 15.0
Construction Products            
Business Combination [Line Items]            
Goodwill     848.8 861.2    
Engineered Structures            
Business Combination [Line Items]            
Goodwill     480.2 480.1    
Stavola | Construction Products            
Business Combination [Line Items]            
Cash     0.7      
Receivables, net of allowance     69.2      
Inventories     23.5      
Other current assets     2.6      
Property, plant, and equipment, including mineral reserves     742.6      
Goodwill     339.3      
Intangibles     40.4      
Other assets     23.2      
Accounts payable     (18.0)      
Accrued liabilities     (2.6)      
Advance billings     (0.8)      
Other liabilities     (28.1)      
Purchase price $ 1,200.0   $ 1,192.0      
Stavola | Construction Products | Beneficial use rights            
Business Combination [Line Items]            
Useful life of acquired intangible asset     34 years      
Stavola | Construction Products | Permits            
Business Combination [Line Items]            
Useful life of acquired intangible asset     20 years      
Stavola | Construction Products | Trade names            
Business Combination [Line Items]            
Useful life of acquired intangible asset     5 years      
Ameron | Engineered Structures            
Business Combination [Line Items]            
Receivables, net of allowance       12.0    
Inventories       18.1    
Property, plant, and equipment, including mineral reserves       60.8    
Goodwill       42.3    
Intangible asset       12.8    
Purchase price   $ 180.0        
Ameron | Engineered Structures | Trademarks            
Business Combination [Line Items]            
Trademarks       8.9    
Ameron | Engineered Structures | Customer relationships            
Business Combination [Line Items]            
Intangible asset       25.6    
Lake Point | Construction Products            
Business Combination [Line Items]            
Property, plant, and equipment, including mineral reserves       13.3    
Mineral Reserves       19.1    
Purchase price         $ 65.1  
Goodwill recorded, net       15.6    
Lake Point | Construction Products | Permits            
Business Combination [Line Items]            
Intangible asset       $ 11.5