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COMMITMENTS AND CONTINGENCIES - Spent Nuclear Fuel Obligations - Yankee Companies (Details) - Yankee Companies - USD ($)
$ in Millions
Jun. 08, 2022
Mar. 25, 2021
Loss Contingencies [Line Items]    
Damages sought $ 33.1  
CYAPC, YAEC, and MYAPC    
Loss Contingencies [Line Items]    
Damages sought   $ 120.4