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LEASES - Components of Lease Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Lease, Cost [Abstract]      
Amortization of Right-of-use-Assets $ 6.4 $ 4.8 $ 8.3
Interest on Lease Liabilities 2.7 2.0 2.0
Total Finance Lease Cost 9.1 6.8 10.3
Operating Lease Cost 15.2 11.4 11.6
Variable Lease Cost 18.3 69.2 78.1
Total Lease Cost 42.6 87.4 100.0
CL&P      
Lease, Cost [Abstract]      
Amortization of Right-of-use-Assets 1.7 0.0 0.0
Interest on Lease Liabilities 0.8 0.0 0.0
Total Finance Lease Cost 2.5 0.0 0.0
Operating Lease Cost 2.6 0.7 0.3
Variable Lease Cost 18.9 21.9 25.6
Total Lease Cost 24.0 22.6 25.9
NSTAR Electric      
Lease, Cost [Abstract]      
Amortization of Right-of-use-Assets 0.2 0.2 0.2
Interest on Lease Liabilities 0.6 0.6 0.6
Total Finance Lease Cost 0.8 0.8 0.8
Operating Lease Cost 5.3 3.0 2.3
Variable Lease Cost 0.0 0.0 0.0
Total Lease Cost 6.1 3.8 3.1
PSNH      
Lease, Cost [Abstract]      
Amortization of Right-of-use-Assets 0.0 0.0 0.1
Interest on Lease Liabilities 0.0 0.0 0.0
Total Finance Lease Cost 0.0 0.0 0.1
Operating Lease Cost 1.8 0.4 0.1
Variable Lease Cost (0.6)    
Variable Lease Cost   47.3 52.5
Total Lease Cost $ 1.2 $ 47.7 $ 52.7