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Segment Information - Financial information for segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Revenues $ 632.0 $ 598.6  
Cost of revenues 506.6 487.0  
Selling, general, and administrative expenses 73.7 69.1  
Gain on disposition of property, plant, equipment, and other assets (3.8) (3.9)  
Gain on sale of businesses (0.3) (7.0)  
Operating profit (loss) 55.8 53.4  
Depreciation, depletion, and amortization 53.6 42.8  
Assets 4,933.9 [1] 3,668.1 [1] $ 4,915.5
Payments to Acquire Productive Assets 34.0 54.4  
Total      
Segment Reporting Information [Line Items]      
Revenues 632.0 598.6  
Corporate      
Segment Reporting Information [Line Items]      
Revenues 0.0 0.0  
Cost of revenues 0.0 0.0  
Selling, general, and administrative expenses 15.4 16.3  
Gain on disposition of property, plant, equipment, and other assets 0.0 0.0  
Gain on sale of businesses 0.0 0.0  
Operating profit (loss) (15.4) (16.3)  
Depreciation, depletion, and amortization 0.4 0.8  
Assets [1] 238.6 210.0  
Payments to Acquire Productive Assets 1.0 0.4  
Construction Products | Total      
Segment Reporting Information [Line Items]      
Revenues 262.8 251.2  
Cost of revenues 217.1 198.3  
Selling, general, and administrative expenses 31.2 28.0  
Gain on disposition of property, plant, equipment, and other assets (3.8) (3.9)  
Gain on sale of businesses 0.0 0.0  
Operating profit (loss) 18.3 28.8  
Depreciation, depletion, and amortization 38.6 30.1  
Assets [1] 3,285.4 2,067.7  
Payments to Acquire Productive Assets 24.4 30.7  
Engineered Structures | Total      
Segment Reporting Information [Line Items]      
Revenues 284.8 231.6  
Cost of revenues 222.6 193.8  
Selling, general, and administrative expenses 23.2 18.5  
Gain on disposition of property, plant, equipment, and other assets 0.0 0.0  
Gain on sale of businesses 0.0 (7.0)  
Operating profit (loss) 39.0 26.3  
Depreciation, depletion, and amortization 12.7 7.9  
Assets [1] 1,252.0 1,084.5  
Payments to Acquire Productive Assets 7.6 21.4  
Transportation Products | Total      
Segment Reporting Information [Line Items]      
Revenues 84.4 115.8  
Cost of revenues 66.9 94.9  
Selling, general, and administrative expenses 3.9 6.3  
Gain on disposition of property, plant, equipment, and other assets 0.0 0.0  
Gain on sale of businesses (0.3) 0.0  
Operating profit (loss) 13.9 14.6  
Depreciation, depletion, and amortization 1.9 4.0  
Assets [1] 157.9 305.9  
Payments to Acquire Productive Assets 1.0 1.9  
Eliminations | Intersegment      
Segment Reporting Information [Line Items]      
Revenues 0.0 0.0  
Cost of revenues 0.0 0.0  
Selling, general, and administrative expenses 0.0 0.0  
Gain on disposition of property, plant, equipment, and other assets 0.0 0.0  
Gain on sale of businesses 0.0 0.0  
Operating profit (loss) 0.0 0.0  
Depreciation, depletion, and amortization 0.0 0.0  
Assets [1] 0.0 0.0  
Payments to Acquire Productive Assets $ 0.0 $ 0.0  
[1] (unaudited)