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Revenue and Contracts in Process - Schedule of Infrastructure Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 315.2	$ 317.9
Infrastructure
Disaggregation of Revenue [Line Items]
Revenue	307.5	311.7
Other revenue	0.4	0.0
Total Infrastructure segment revenue	307.9	311.7
Infrastructure | Transportation
Disaggregation of Revenue [Line Items]
Revenue	100.4	41.5
Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue	84.1	91.3
Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue	77.3	112.5
Infrastructure | Healthcare
Disaggregation of Revenue [Line Items]
Revenue	34.3	31.4
Infrastructure | Convention
Disaggregation of Revenue [Line Items]
Revenue	5.5	25.4
Infrastructure | Government
Disaggregation of Revenue [Line Items]
Revenue	2.7	3.7
Infrastructure | Energy
Disaggregation of Revenue [Line Items]
Revenue	2.2	2.7
Infrastructure | Leisure
Disaggregation of Revenue [Line Items]
Revenue	$ 1.0	$ 3.2

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