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LEASES - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Operating Leases: |  |
Right-of-use-Assets, Net | $ 47.2 | $ 55.2
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Assets | Other Long-Term Assets
Current Portion | $ 10.0 | $ 9.5
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Long-Term | $ 37.2 | $ 45.7
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Liabilities | Other Long-Term Liabilities
Total Operating Lease Liabilities | $ 47.2 | $ 55.2
Finance Leases: |  |
Right-of-use-Assets, Net | $ 58.0 | $ 60.5
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property, Plant and Equipment, Net | Property, Plant and Equipment, Net
Current Portion | $ 3.9 | $ 5.0
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Current Liabilities | Other Current Liabilities
Long-Term | $ 55.4 | $ 57.6
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Long-Term Liabilities | Other Long-Term Liabilities
Total Finance Lease Liabilities | $ 59.3 | $ 62.6
The Connecticut Light and Power Company |  |
Operating Leases: |  |
Right-of-use-Assets, Net | 0.1 | 0.3
Current Portion | 0.1 | 0.2
Long-Term | 0.0 | 0.1
Total Operating Lease Liabilities | 0.1 | 0.3
Finance Leases: |  |
Right-of-use-Assets, Net | 0.0 | 0.7
Current Portion | 0.0 | 1.4
Long-Term | 0.0 | 0.0
Total Finance Lease Liabilities | 0.0 | 1.4
NSTAR Electric Company |  |
Operating Leases: |  |
Right-of-use-Assets, Net | 24.3 | 23.6
Current Portion | 1.1 | 0.7
Long-Term | 23.2 | 22.9
Total Operating Lease Liabilities | 24.3 | 23.6
Finance Leases: |  |
Right-of-use-Assets, Net | 3.3 | 3.5
Current Portion | 0.0 | 0.0
Long-Term | 4.9 | 4.8
Total Finance Lease Liabilities | 4.9 | 4.8
Public Service Company of New Hampshire |  |
Operating Leases: |  |
Right-of-use-Assets, Net | 0.3 | 0.3
Current Portion | 0.0 | 0.0
Long-Term | 0.3 | 0.3
Total Operating Lease Liabilities | 0.3 | 0.3
Finance Leases: |  |
Right-of-use-Assets, Net | 0.7 | 0.8
Current Portion | 0.1 | 0.1
Long-Term | 0.6 | 0.7
Total Finance Lease Liabilities | $ 0.7 | $ 0.8

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