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DERIVATIVE INSTRUMENTS - Gross Fair Values and Net Amounts of Contracts (Details) - CL&P - Level 3 - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Current Derivative Assets |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Commodity Supply and Price Risk Management | $ 15.2 | $ 14.7
Netting | (0.5) | (1.0)
Net Amount Recorded as a Derivative | 14.7 | 13.7
Other Long-Term Assets |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Commodity Supply and Price Risk Management | 37.7 | 46.9
Netting | (1.1) | (0.9)
Net Amount Recorded as a Derivative | 36.6 | 46.0
Current Derivative Liabilities |  |
Current and Long-Term Derivative Liabilities |  |
Commodity Supply and Price Risk Management | (75.9) | (73.5)
Netting | 0.0 | 0.0
Net Amount Recorded as a Derivative | (75.9) | (73.5)
Long-Term Derivative Liabilities |  |
Current and Long-Term Derivative Liabilities |  |
Commodity Supply and Price Risk Management | (188.7) | (235.4)
Netting | 0.0 | 0.0
Net Amount Recorded as a Derivative | $ (188.7) | $ (235.4)

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