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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
AP1000
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 10.0	$ 15.0
Standby Letters Of Credit
Loss Contingencies [Line Items]
Letters of credit, outstanding	19.0		$ 17.0
FinancialStandbyLetterOfCreditMember
Loss Contingencies [Line Items]
Letters of credit, outstanding	14.0		$ 3.0
Surety Bond
Loss Contingencies [Line Items]
Surety bond outstanding	$ 35.0