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Overview and Summary of Significant Accounting Policies - Unsatisfied Performance Obligation (Details) $ in Millions	Sep. 30, 2023 USD ($)
Engineered Structures | Utility, wind, and related structures
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations, Amount	$ 1,450.8
Revenue, remaining performance obligation expected to be delivered in current year	15.00%
Revenue Remaining Performance Obligation Percentage Year 2	33.00%
Transportation Products | Inland barges
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligations, Amount	$ 240.4
Revenue, remaining performance obligation expected to be delivered in current year	26.00%

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Revenue Remaining Performance Obligation Percentage Year 2

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Revenue, remaining performance obligation expected to be delivered in current year

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

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