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Revenue and Contracts in Process - Schedule of Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total revenue	$ 274.2	$ 315.2
Infrastructure
Segment Reporting Information [Line Items]
Total revenue	264.9	307.9
Life Sciences
Segment Reporting Information [Line Items]
Total revenue	3.1	1.0
Spectrum
Segment Reporting Information [Line Items]
Total revenue	$ 6.2	$ 6.3

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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