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Segment Information - Financial information for segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 2,569.9 $ 2,307.9 $ 2,242.8
Cost of revenues 2,054.7 1,864.1 1,831.7
Selling, general, and administrative expenses 320.0 261.1 262.8
Gain on disposition of property, plant, equipment, and other assets (10.3) (28.2) (11.7)
(Gain) loss on sale of businesses 2.1 (6.4) (189.0)
Asset impairment charges 5.8 0.0 0.0
Operating profit (loss) 197.6 217.3 349.0
Depreciation, depletion, and amortization 195.0 159.5 154.1
Assets 4,915.5 3,577.9 3,340.6
Capital Expenditures 189.7 203.5 138.0
Total      
Segment Reporting Information [Line Items]      
Revenues 2,570.0 2,308.3 2,242.8
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Segment Reporting Information [Line Items]      
Revenues 0.0 0.0 0.0
Cost of revenues 0.0 0.0 0.0
Selling, general, and administrative expenses 92.9 62.8 66.0
Gain on disposition of property, plant, equipment, and other assets 0.0 0.0 0.0
(Gain) loss on sale of businesses 0.0 0.0 0.0
Asset impairment charges 0.0    
Operating profit (loss) 92.9 62.8 (66.0)
Depreciation, depletion, and amortization 2.3 5.2 5.1
Assets 269.5 163.2 224.8
Capital Expenditures 2.6 1.9 0.1
Construction Products | Total      
Segment Reporting Information [Line Items]      
Revenues 1,105.1 1,001.3 923.5
Cost of revenues 864.0 783.9 736.3
Selling, general, and administrative expenses 116.2 107.0 100.4
Gain on disposition of property, plant, equipment, and other assets (9.8) (28.2) (9.7)
(Gain) loss on sale of businesses (5.0) 0.0 0.0
Asset impairment charges 5.8    
Operating profit (loss) 133.9 138.6 96.5
Depreciation, depletion, and amortization 134.7 111.7 102.7
Assets 3,304.9 2,043.1 1,895.7
Capital Expenditures 111.7 89.9 84.6
Engineered Structures | Total      
Segment Reporting Information [Line Items]      
Revenues 1,047.3 873.5 1,002.0
Cost of revenues 847.5 718.3 812.4
Selling, general, and administrative expenses 88.4 65.9 73.6
Gain on disposition of property, plant, equipment, and other assets (0.5) 0.0 (2.0)
(Gain) loss on sale of businesses (14.5) (6.4) (189.0)
Asset impairment charges 0.0    
Operating profit (loss) 126.4 95.7 307.0
Depreciation, depletion, and amortization 45.4 26.6 30.5
Assets 1,191.5 1,063.4 956.1
Capital Expenditures 64.4 97.8 44.5
Transportation Products | Total      
Segment Reporting Information [Line Items]      
Revenues 417.6 433.5 317.3
Cost of revenues 343.3 362.3 283.0
Selling, general, and administrative expenses 22.5 25.4 22.8
Gain on disposition of property, plant, equipment, and other assets 0.0 0.0 0.0
(Gain) loss on sale of businesses 21.6 0.0 0.0
Asset impairment charges 0.0    
Operating profit (loss) 30.2 45.8 11.5
Depreciation, depletion, and amortization 12.6 16.0 15.8
Assets 149.6 308.2 264.0
Capital Expenditures 11.0 13.9 8.8
Eliminations | Intersegment      
Segment Reporting Information [Line Items]      
Revenues 0.1 0.4 0.0
Cost of revenues 0.1 0.4 0.0
Selling, general, and administrative expenses 0.0 0.0 0.0
Gain on disposition of property, plant, equipment, and other assets 0.0 0.0 0.0
(Gain) loss on sale of businesses 0.0 0.0 0.0
Asset impairment charges 0.0    
Operating profit (loss) 0.0 0.0 0.0
Depreciation, depletion, and amortization 0.0 0.0 0.0
Assets 0.0 0.0 0.0
Capital Expenditures $ 0.0 $ 0.0 $ 0.0