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Segment Information - Financial information for segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 2,883.4 $ 2,569.9 $ 2,307.9
Cost of revenues 2,236.2 2,054.7 1,864.1
Selling, general, and administrative expenses 307.1 320.0 261.1
Other operating (income) expense (1.8) (2.4) (34.6)
Operating profit (loss) 341.9 197.6 217.3
Depreciation, depletion, and amortization 223.0 195.0 159.5
Assets 4,985.2 4,915.5 3,577.9
Capital Expenditures 165.6 189.7 203.5
Total      
Segment Reporting Information [Line Items]      
Revenues 2,883.4 2,570.0 2,308.3
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 64.1 92.9 62.8
Other operating (income) expense 0.0 0.0 0.0
Operating profit (loss) (64.1) (92.9) (62.8)
Depreciation, depletion, and amortization 1.7 2.3 5.2
Assets 290.1 269.5 163.2
Capital Expenditures 1.8 2.6 1.9
Construction Products | Total      
Segment Reporting Information [Line Items]      
Revenues 1,310.2 1,105.1 1,001.3
Cost of revenues 1,005.7 864.0 783.9
Selling, general, and administrative expenses 130.0 116.2 107.0
Other operating (income) expense (15.2) (9.0) (28.2)
Operating profit (loss) 189.7 133.9 138.6
Depreciation, depletion, and amortization 164.7 134.7 111.7
Assets 3,281.9 3,304.9 2,043.1
Capital Expenditures 113.0 111.7 89.9
Engineered Structures | Total      
Segment Reporting Information [Line Items]      
Revenues 1,189.9 1,047.3 873.5
Cost of revenues 925.3 847.5 718.3
Selling, general, and administrative expenses 95.7 88.4 65.9
Other operating (income) expense (1.3) (15.0) (6.4)
Operating profit (loss) 170.2 126.4 95.7
Depreciation, depletion, and amortization 49.1 45.4 26.6
Assets 1,245.2 1,191.5 1,063.4
Capital Expenditures 46.1 64.4 97.8
Transportation Products | Total      
Segment Reporting Information [Line Items]      
Revenues 383.3 417.6 433.5
Cost of revenues 305.2 343.3 362.3
Selling, general, and administrative expenses 17.3 22.5 25.4
Other operating (income) expense 14.7 21.6 0.0
Operating profit (loss) 46.1 30.2 45.8
Depreciation, depletion, and amortization 7.5 12.6 16.0
Assets 168.0 149.6 308.2
Capital Expenditures 4.7 11.0 13.9
Eliminations | Intersegment      
Segment Reporting Information [Line Items]      
Revenues 0.0 (0.1) (0.4)
Cost of revenues 0.0 (0.1) (0.4)
Selling, general, and administrative expenses 0.0 0.0 0.0
Other operating (income) expense 0.0 0.0 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