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LEASES - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Operating Leases: |  |
Right-of-use-Assets, Net | $ 53.5 | $ 56.9
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Assets | Other Long-Term Assets
Current Portion | $ 9.5 | $ 9.0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Long-Term | $ 44.0 | $ 47.9
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Liabilities | Other Long-Term Liabilities
Total Operating Lease Liabilities | $ 53.5 | $ 56.9
Finance Leases: |  |
Right-of-use-Assets, Net | $ 68.6 | $ 54.5
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property, Plant and Equipment, Net | Property, Plant and Equipment, Net
Current Portion | $ 5.4 | $ 3.8
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Long-Term | $ 67.3 | $ 54.2
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Liabilities | Other Long-Term Liabilities
Total Finance Lease Liabilities | $ 72.7 | $ 58.0
CL&P |  |
Operating Leases: |  |
Right-of-use-Assets, Net | 2.2 | 2.2
Current Portion | 0.8 | 0.6
Long-Term | 1.4 | 1.6
Total Operating Lease Liabilities | 2.2 | 2.2
Finance Leases: |  |
Right-of-use-Assets, Net | 18.3 | 0.0
Current Portion | 1.4 | 0.0
Long-Term | 16.9 | 0.0
Total Finance Lease Liabilities | 18.3 | 0.0
NSTAR Electric |  |
Operating Leases: |  |
Right-of-use-Assets, Net | 27.7 | 22.5
Current Portion | 2.2 | 1.2
Long-Term | 25.5 | 21.3
Total Operating Lease Liabilities | 27.7 | 22.5
Finance Leases: |  |
Right-of-use-Assets, Net | 3.0 | 3.2
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 | 4.7 | 0.0
Current Portion | 1.5 | 0.0
Long-Term | 3.2 | 0.0
Total Operating Lease Liabilities | 4.7 | 0.0
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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