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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill by segment Goodwill by segment is as follows:
March 31,
2023		December 31,
2022
 (in millions)
Construction Products$501.9 $483.9 
Engineered Structures437.6 437.6 
Transportation Products37.0 37.0 
$976.5 $958.5 
Intangibles, net
Intangibles, net consisted of the following:
March 31,
2023		December 31,
2022
(in millions)
Intangibles with indefinite lives - Trademarks$34.1 $34.1 
Intangibles with definite lives:
Customer relationships136.9136.9
Permits141.7141.7
Other2.72.7
281.3281.3
Less accumulated amortization(64.5)(59.3)
216.8222.0
Intangible assets, net$250.9 $256.1