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LEASES - Future Minimum Lease Payments under Long-Term Leases (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Operating Leases
2025	$ 12.5
2026	11.0
2027	7.0
2028	6.6
2029	4.5
Thereafter	26.2
Future lease payments	67.8
Less amount representing interest	11.7
Present value of future minimum lease payments	56.1	$ 53.5
Finance Leases
2025	8.3
2026	7.9
2027	7.9
2028	7.3
2029	7.3
Thereafter	50.5
Future lease payments	89.2
Less amount representing interest	21.5
Present value of future minimum lease payments	67.7	72.7
CL&P
Operating Leases
2025	2.6
2026	2.3
2027	1.8
2028	1.8
2029	0.0
Thereafter	0.0
Future lease payments	8.5
Less amount representing interest	0.8
Present value of future minimum lease payments	7.7	2.2
Finance Leases
2025	2.3
2026	2.4
2027	2.5
2028	2.6
2029	2.6
Thereafter	8.9
Future lease payments	21.3
Less amount representing interest	4.2
Present value of future minimum lease payments	17.1	18.3
NSTAR Electric
Operating Leases
2025	4.9
2026	4.9
2027	2.9
2028	2.6
2029	2.5
Thereafter	22.2
Future lease payments	40.0
Less amount representing interest	10.6
Present value of future minimum lease payments	29.4	27.7
Finance Leases
2025	0.7
2026	0.7
2027	0.7
2028	0.7
2029	0.7
Thereafter	10.2
Future lease payments	13.7
Less amount representing interest	8.8
Present value of future minimum lease payments	4.9	4.9
PSNH
Operating Leases
2025	1.9
2026	1.5
2027	0.1
2028	0.0
2029	0.0
Thereafter	0.0
Future lease payments	3.5
Less amount representing interest	0.2
Present value of future minimum lease payments	3.3	4.7
Finance Leases
Present value of future minimum lease payments	$ 0.0	$ 0.0

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