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DERIVATIVE INSTRUMENTS - Schedule of Gross Fair Value of Contracts (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Level 2 | Current Derivative Liabilities    
Current and Long-Term Derivative Liabilities    
Commodity Supply and Price Risk Management $ 0.0 $ (3.3)
Netting 0.0 0.1
Net Amount Recorded as a Derivative 0.0 (3.2)
The Connecticut Light and Power Company | Level 3 | Current Derivative Assets    
Current and Long-Term Derivative Assets    
Commodity Supply and Price Risk Management 14.7 13.7
Netting (1.0) (0.4)
Net Amount Recorded as a Derivative 13.7 13.3
The Connecticut Light and Power Company | Level 3 | Long-Term Derivative Assets    
Current and Long-Term Derivative Assets    
Commodity Supply and Price Risk Management 46.9 58.7
Netting (0.9) (1.8)
Net Amount Recorded as a Derivative 46.0 56.9
The Connecticut Light and Power Company | Level 3 | Current Derivative Liabilities    
Current and Long-Term Derivative Liabilities    
Commodity Supply and Price Risk Management (73.5) (68.8)
Netting 0.0 0.0
Net Amount Recorded as a Derivative (73.5) (68.8)
The Connecticut Light and Power Company | Level 3 | Long-Term Derivative Liabilities    
Current and Long-Term Derivative Liabilities    
Commodity Supply and Price Risk Management (235.4) (294.5)
Netting 0.0 0.0
Net Amount Recorded as a Derivative $ (235.4) $ (294.5)