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Segment Information - Financial information for segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Revenues $ 549.2 $ 535.8
Operating profit (loss) 75.1 34.7
Total    
Segment Reporting Information [Line Items]    
Revenues 549.2 535.8
Operating profit (loss) 89.5 47.7
Corporate    
Segment Reporting Information [Line Items]    
Revenues 0.0 0.0
Operating profit (loss) (14.4) (13.0)
Construction Products | Total    
Segment Reporting Information [Line Items]    
Revenues 236.1 211.5
Operating profit (loss) 49.5 16.7
Engineered Structures | Total    
Segment Reporting Information [Line Items]    
Revenues 207.7 250.5
Operating profit (loss) 29.9 28.3
Transportation Products | Total    
Segment Reporting Information [Line Items]    
Revenues 105.4 73.8
Operating profit (loss) 10.1 2.7
Aggregates and specialty materials | Construction Products    
Segment Reporting Information [Line Items]    
Revenues 211.0 187.9
Construction site support | Construction Products    
Segment Reporting Information [Line Items]    
Revenues 25.1 23.6
Utility, wind, and related structures | Engineered Structures    
Segment Reporting Information [Line Items]    
Revenues 207.7 190.6
Storage tanks | Engineered Structures    
Segment Reporting Information [Line Items]    
Revenues 0.0 59.9
Inland barges | Transportation Products    
Segment Reporting Information [Line Items]    
Revenues 68.1 47.0
Steel components | Transportation Products    
Segment Reporting Information [Line Items]    
Revenues $ 37.3 $ 26.8