REVENUE - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Contract with customer, liability, revenue recognized	$ 383.3	$ 340.8	$ 839.7	$ 950.0
Favorable (unfavorable) impacts of net revenue recognized	36.9	51.7	95.1	71.1
Favorable (unfavorable) impacts of changes in contract estimates	(17.2)	123.3	39.4	137.7
Favorable (unfavorable) impacts of cost estimate revisions	(73.3)	$ 115.5		$ 118.7
Favorable updates across the project portfolio	56.1
Aggregate transaction price allocated to order backlog	16,440.0		16,440.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01
Disaggregation of Revenue [Line Items]
Aggregate transaction price allocated to order backlog	$ 4,043.0		$ 4,043.0
Remaining performance obligation (percent)	24.60%		24.60%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Aggregate transaction price allocated to order backlog	$ 5,405.8		$ 5,405.8
Remaining performance obligation (percent)	75.40%		75.40%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Disaggregation of Revenue [Line Items]
Aggregate transaction price allocated to order backlog	$ 6,991.2		$ 6,991.2

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained.

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