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EMPLOYEE BENEFITS - Share-Based Payments Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted in incentive plan (up to) (in shares) 7,400,000    
Shares available for issuance under incentive plan (in shares) 3,790,353 4,587,376  
Shares outstanding (in shares) 455,620    
Weighted average grant date fair value of restricted stock units (in dollars per share) $ 65.20    
Total unrecognized compensation expense $ 31.2    
Period for recognition 1 year 9 months 3 days    
Tax effect on total share-based payments (in percentage) 26.00%    
Excess stock benefit $ (2.3) $ (0.5) $ 2.1
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in dollars per share) $ 57.93 $ 76.42 $ 85.96
Shares outstanding (in shares)   326,581  
Weighted average shares outstanding (in dollars per share) $ 65.29 $ 80.76  
Restricted stock units available (in shares) 280,938    
Restricted stock unit fully vested (in shares) 259,822    
Additional restricted stock unit expected to vest (in shares) 432,839    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in dollars per share) $ 55.87 $ 83.39 $ 83.34
Shares outstanding (in shares) 737,738 485,480  
Weighted average shares outstanding (in dollars per share) $ 69.12 $ 85.20  
Restricted stock units available (in shares) 72,723    
Weighted average grant date fair value of restricted stock units (in dollars per share) $ 84.87    
Restricted stock unit fully vested (in shares) 126,454    
CL&P      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation expense $ 5.5    
Period for recognition 1 year 9 months 3 days    
Excess stock benefit $ (0.8) $ (0.2) $ 0.7
NSTAR Electric      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation expense $ 8.8    
Period for recognition 1 year 9 months 7 days    
Excess stock benefit $ (0.8) (0.2) 0.8
PSNH      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation expense $ 2.0    
Period for recognition 1 year 9 months 3 days    
Excess stock benefit $ (0.3) $ (0.1) $ 0.3
Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of graded vesting schedule under long-term incentive program 3 years    
Board Members      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of graded vesting schedule under long-term incentive program 1 year