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Acquisitions and Divestitures - Purchase price allocation (Details) - USD ($)
$ in Millions
 3 Months Ended
Oct. 01, 2024
Mar. 31, 2025
Jun. 30, 2024
Dec. 31, 2024
Business Combination [Line Items]        
Goodwill   $ 1,343.2 [1]   $ 1,361.2
Construction Products        
Business Combination [Line Items]        
Goodwill   843.2   861.2
Engineered Structures        
Business Combination [Line Items]        
Goodwill   480.1   480.1
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
Acquisition price     $ 180.0  
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   743.0    
Goodwill   333.6    
Intangibles   41.0    
Other assets   24.9    
Accounts payable   (17.9)    
Accrued liabilities   (2.5)    
Advance billings   (0.8)    
Other liabilities   (25.3)    
Acquisition price $ 1,200.0 $ 1,192.0    
[1] (unaudited)