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INCOME TAXES - Schedule of Unrecognized Tax Benefits Roll Forward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]      
Beginning Balance $ 81.3 $ 67.1 $ 65.8
Gross Increases - Current Year 14.2 23.4 11.5
Gross Increases - Prior Year 11.0 0.1  
Gross Decreases - Prior Year (0.2) (0.1) (2.4)
Lapse of Statute of Limitations (12.6) (9.2) (7.8)
Ending Balance 93.7 81.3 67.1
CL&P      
Unrecognized Tax Benefits [Roll Forward]      
Beginning Balance 25.8 25.5 26.2
Gross Increases - Current Year 2.9 4.0 3.5
Gross Increases - Prior Year 0.0 0.1  
Gross Decreases - Prior Year (0.2) 0.0 (0.9)
Lapse of Statute of Limitations (6.6) (3.8) (3.3)
Ending Balance $ 21.9 $ 25.8 $ 25.5