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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