Acquisitions, Dispositions, and Deconsolidations - Infrastructure Segment Narrative (Details)		9 Months Ended
May 27, 2021 USD ($) company	Sep. 30, 2021 segment
Business Acquisition [Line Items]
Number of reportable operating segments \| segment		3
Customer relationships and contracts
Business Acquisition [Line Items]
Weighted-average original useful life		11 years
Banker Steel Acquisition
Business Acquisition [Line Items]
Percentage of business acquired	100.00%
Gross consideration	$ 145,000,000.0
Long-term debt, less current portion	6,300,000
Cash acquired from acquisition	$ 25,000,000.0
Number of reportable operating segments \| company	6
Intangibles, net	$ 61,400,000
Goodwill, expected tax deductible amount	0
Banker Steel Acquisition \| Trade names
Business Acquisition [Line Items]
Indefinite-lived intangible assets	$ 7,400,000
Indefinite-lived intangible assets, useful life	15 years
Banker Steel Acquisition \| Customer relationships and contracts
Business Acquisition [Line Items]
Finite-lived intangibles	$ 34,100,000
Weighted-average original useful life	18 years
Banker Steel Acquisition \| Customer Contracts
Business Acquisition [Line Items]
Finite-lived intangibles	$ 17,900,000
Weighted-average original useful life	2 years
Banker Steel Acquisition \| Leasehold Interests
Business Acquisition [Line Items]
Finite-lived intangibles	$ 2,000,000
Banker Steel Acquisition \| Sellers' Notes
Business Acquisition [Line Items]
Face amount	49,600,000
Banker Steel Acquisition \| Revolving Credit Facility
Business Acquisition [Line Items]
Face amount	64,100,000
Banker Steel Acquisition \| Term Loan
Business Acquisition [Line Items]
Face amount	110,000,000
DBMG
Business Acquisition [Line Items]
Acquisition related costs	$ 2,200,000

Acquired Indefinite-lived Intangible Assets, Weighted Average Useful Life

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Face (par) amount of debt instrument at time of issuance.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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