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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]            
Goodwill     $ 1,361.2 $ 990.7    
Purchase price     1,424.2 119.4 $ 75.6  
Goodwill recorded     397.1 40.4 11.6  
Acquisition holdback           $ 15.0
Construction Products            
Business Acquisition [Line Items]            
Goodwill     861.2 516.1    
Engineered Structures            
Business Acquisition [Line Items]            
Goodwill     480.1 437.6    
RAMCO | Construction Products            
Business Acquisition [Line Items]            
Property, plant, and equipment, including mineral reserves       6.4    
Purchase price         $ 77.4  
Goodwill recorded       13.4    
RAMCO | Construction Products | Permits            
Business Acquisition [Line Items]            
Intangible asset       54.2    
Useful life of acquired intangible asset         20 years  
Lake Point | Construction Products            
Business Acquisition [Line Items]            
Property, plant, and equipment, including mineral reserves     13.3      
Mineral Reserves     19.1      
Purchase price       $ 65.1    
Goodwill recorded     15.6      
Lake Point | Construction Products | Permits            
Business Acquisition [Line Items]            
Intangible asset     11.5      
Ameron | Engineered Structures            
Business Acquisition [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 Acquisition [Line Items]            
Trademarks     8.9      
Ameron | Engineered Structures | Customer relationships            
Business Acquisition [Line Items]            
Intangible asset     25.6      
Stavola | Construction Products            
Business Acquisition [Line Items]            
Cash     0.7      
Receivables, net of allowance     69.1      
Inventories     23.2      
Other     2.6      
Property, plant, and equipment, including mineral reserves     743.0      
Goodwill     351.5      
Intangibles     41.0      
Other assets     24.9      
Accounts payable     (17.9)      
Accrued liabilities     (2.4)      
Advance billings     (0.8)      
Other liabilities     (25.3)      
Purchase price $ 1,200.0   $ 1,209.6      
Stavola | Construction Products | Trade names            
Business Acquisition [Line Items]            
Useful life of acquired intangible asset     5 years      
Stavola | Construction Products | Permits            
Business Acquisition [Line Items]            
Useful life of acquired intangible asset     20 years