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Revenue - Disaggregation of revenue by customer type and contract type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue
Revenue	$ 1,559.9	$ 1,648.1
Fixed Price
Disaggregation of Revenue
Revenue	701.4	835.7
Unit Price
Disaggregation of Revenue
Revenue	557.3	488.1
Cost Reimbursable
Disaggregation of Revenue
Revenue	301.2	324.3
MSA
Disaggregation of Revenue
Revenue	559.8	490.0
Non-MSA
Disaggregation of Revenue
Revenue	1,000.1	1,158.1
Intersegment eliminations
Disaggregation of Revenue
Revenue	(28.4)	(23.6)
Intersegment eliminations | Fixed Price
Disaggregation of Revenue
Revenue	(25.7)	(19.1)
Intersegment eliminations | Unit Price
Disaggregation of Revenue
Revenue	(1.6)	(3.5)
Intersegment eliminations | Cost Reimbursable
Disaggregation of Revenue
Revenue	(1.1)	(1.0)
Intersegment eliminations | MSA
Disaggregation of Revenue
Revenue		(0.5)
Intersegment eliminations | Non-MSA
Disaggregation of Revenue
Revenue	(28.4)	(23.1)
Utilities | Operating Segment
Disaggregation of Revenue
Revenue	632.9	563.4
Utilities | Operating Segment | Fixed Price
Disaggregation of Revenue
Revenue	112.1	77.9
Utilities | Operating Segment | Unit Price
Disaggregation of Revenue
Revenue	399.1	344.4
Utilities | Operating Segment | Cost Reimbursable
Disaggregation of Revenue
Revenue	121.7	141.1
Utilities | Operating Segment | MSA
Disaggregation of Revenue
Revenue	473.6	452.1
Utilities | Operating Segment | Non-MSA
Disaggregation of Revenue
Revenue	159.3	111.3
Utilities | Intersegment eliminations
Disaggregation of Revenue
Revenue	28.4	23.6
Energy | Operating Segment
Disaggregation of Revenue
Revenue	955.4	1,108.3
Energy | Operating Segment | Fixed Price
Disaggregation of Revenue
Revenue	615.0	776.9
Energy | Operating Segment | Unit Price
Disaggregation of Revenue
Revenue	159.8	147.2
Energy | Operating Segment | Cost Reimbursable
Disaggregation of Revenue
Revenue	180.6	184.2
Energy | Operating Segment | MSA
Disaggregation of Revenue
Revenue	86.2	38.4
Energy | Operating Segment | Non-MSA
Disaggregation of Revenue
Revenue	$ 869.2	$ 1,069.9

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