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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill by segment
Goodwill by segment is as follows:
December 31,
2024		December 31,
2023
 (in millions)
Construction Products$861.2 $516.1 
Engineered Structures480.1 437.6 
Transportation Products19.9 37.0 
$1,361.2 $990.7 
Intangible assets, net
Intangibles, net consisted of the following:
December 31, 2024December 31, 2023
(in millions)
Intangibles with indefinite lives - Trademarks$43.8 $34.9 
Intangibles with definite lives:
Customer relationships169.1142.7
Permits178.1166.9
Other49.62.3
396.8311.9
Less accumulated amortization(102.3)(76.1)
294.5235.8
Intangible assets, net$338.3 $270.7 
Expected future amortization expense of intangibles Expected future amortization expense of intangibles as of December 31, 2024 is as follows:
Amortization Expense
(in millions)
2025$26.7 
202622.7 
202720.5 
202820.5 
202920.1 
Thereafter184.0