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EMPLOYEE BENEFITS - Schedule of Prepaid Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset $ 1,336.6 $ 1,028.2
Less: Accrued SERP - current portion (24.0) (19.4)
Accrued SERP and PBOP 95.4 123.8
CL&P    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 182.5 129.8
Less: Accrued SERP - current portion (0.4) (0.3)
Accrued SERP and PBOP 5.3 5.6
NSTAR Electric    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 724.7 608.6
Less: Accrued SERP - current portion (0.2) (0.2)
Accrued SERP and PBOP 2.0 1.7
PSNH    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 91.0 59.0
Less: Accrued SERP - current portion (0.4) (0.4)
Accrued SERP and PBOP 4.1 4.2
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 887.7 672.2
Pension Plan | CL&P    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 167.2 127.4
Pension Plan | NSTAR Electric    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 376.9 306.5
Pension Plan | PSNH    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 80.5 56.3
PBOP    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 448.9 356.0
Accrued liability, defined benefit pension plan 0.0 7.6
PBOP | CL&P    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 15.3 2.4
Accrued liability, defined benefit pension plan 0.0 0.0
PBOP | NSTAR Electric    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 347.8 302.1
Accrued liability, defined benefit pension plan 0.0 0.0
PBOP | PSNH    
Defined Benefit Plan Disclosure [Line Items]    
Prepaid asset 10.5 2.7
Accrued liability, defined benefit pension plan 0.0 0.0
SERP    
Defined Benefit Plan Disclosure [Line Items]    
Accrued liability, defined benefit pension plan 119.4 135.6
SERP | CL&P    
Defined Benefit Plan Disclosure [Line Items]    
Accrued liability, defined benefit pension plan 5.7 5.9
SERP | NSTAR Electric    
Defined Benefit Plan Disclosure [Line Items]    
Accrued liability, defined benefit pension plan 2.2 1.9
SERP | PSNH    
Defined Benefit Plan Disclosure [Line Items]    
Accrued liability, defined benefit pension plan $ 4.5 $ 4.6