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LEASES - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Operating Leases: |  |
Right-of-use-Assets, Net | $ 56.1 | $ 53.5
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Assets | Other Long-Term Assets
Current Portion | $ 10.4 | $ 9.5
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Long-Term | $ 45.7 | $ 44.0
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Liabilities | Other Long-Term Liabilities
Total Operating Lease Liabilities | $ 56.1 | $ 53.5
Finance Leases: |  |
Right-of-use-Assets, Net | $ 61.9 | $ 68.6
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property, Plant and Equipment, Net | Property, Plant and Equipment, Net
Current Portion | $ 5.6 | $ 5.4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Long-Term | $ 62.1 | $ 67.3
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Liabilities | Other Long-Term Liabilities
Total Finance Lease Liabilities | $ 67.7 | $ 72.7
CL&P |  |
Operating Leases: |  |
Right-of-use-Assets, Net | 7.7 | 2.2
Current Portion | 2.2 | 0.8
Long-Term | 5.5 | 1.4
Total Operating Lease Liabilities | 7.7 | 2.2
Finance Leases: |  |
Right-of-use-Assets, Net | 16.6 | 18.3
Current Portion | 1.5 | 1.4
Long-Term | 15.6 | 16.9
Total Finance Lease Liabilities | 17.1 | 18.3
NSTAR Electric |  |
Operating Leases: |  |
Right-of-use-Assets, Net | 29.4 | 27.7
Current Portion | 3.7 | 2.2
Long-Term | 25.7 | 25.5
Total Operating Lease Liabilities | 29.4 | 27.7
Finance Leases: |  |
Right-of-use-Assets, Net | 2.8 | 3.0
Current Portion | 0.0 | 0.0
Long-Term | 4.9 | 4.9
Total Finance Lease Liabilities | 4.9 | 4.9
PSNH |  |
Operating Leases: |  |
Right-of-use-Assets, Net | 3.3 | 4.7
Current Portion | 1.7 | 1.5
Long-Term | 1.6 | 3.2
Total Operating Lease Liabilities | 3.3 | 4.7
Finance Leases: |  |
Right-of-use-Assets, Net | 0.0 | 0.0
Current Portion | 0.0 | 0.0
Long-Term | 0.0 | 0.0
Total Finance Lease Liabilities | $ 0.0 | $ 0.0

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