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Segment Information - Financial information for segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Revenues $ 591.7 $ 603.9 $ 1,725.7 $ 1,742.5
Operating profit (loss) 48.4 49.0 174.5 140.9
Total        
Segment Reporting Information [Line Items]        
Revenues 591.7 603.9 1,725.7 1,742.5
Operating profit (loss) 63.1 65.7 220.3 186.5
Corporate        
Segment Reporting Information [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Operating profit (loss) (14.7) (16.7) (45.8) (45.6)
Construction Products | Total        
Segment Reporting Information [Line Items]        
Revenues 262.1 244.2 763.0 701.6
Operating profit (loss) 30.3 27.6 114.2 72.4
Engineered Structures | Total        
Segment Reporting Information [Line Items]        
Revenues 222.5 277.0 637.2 796.1
Operating profit (loss) 18.7 37.1 70.3 106.9
Transportation Products | Total        
Segment Reporting Information [Line Items]        
Revenues 107.1 82.7 325.5 244.8
Operating profit (loss) 14.1 1.0 35.8 7.2
Aggregates and specialty materials | Construction Products        
Segment Reporting Information [Line Items]        
Revenues 227.8 216.8 665.9 620.9
Construction site support | Construction Products        
Segment Reporting Information [Line Items]        
Revenues 34.3 27.4 97.1 80.7
Utility, wind, and related structures | Engineered Structures        
Segment Reporting Information [Line Items]        
Revenues 222.5 211.2 637.2 608.5
Storage tanks | Engineered Structures        
Segment Reporting Information [Line Items]        
Revenues 0.0 65.8 0.0 187.6
Inland barges | Transportation Products        
Segment Reporting Information [Line Items]        
Revenues 67.3 50.9 207.9 151.7
Steel components | Transportation Products        
Segment Reporting Information [Line Items]        
Revenues $ 39.8 $ 31.8 $ 117.6 $ 93.1