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DERIVATIVE INSTRUMENTS - Gross Fair Values and Net Amounts of Contracts (Details) - CL&P - Level 3 - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Current Derivative Assets |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Commodity Supply and Price Risk Management | $ 16.9 | $ 16.3
Netting | (0.5) | (0.5)
Net Amount Recorded as a Derivative | 16.4 | 15.8
Other Long-Term Assets |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Commodity Supply and Price Risk Management | 17.0 | 28.8
Netting | (0.5) | (0.9)
Net Amount Recorded as a Derivative | 16.5 | 27.9
Current Derivative Liabilities |  |
Current and Long-Term Derivative Liabilities |  |
Commodity Supply and Price Risk Management | (84.2) | (81.6)
Netting | 0.0 | 0.0
Net Amount Recorded as a Derivative | (84.2) | (81.6)
Long-Term Derivative Liabilities |  |
Current and Long-Term Derivative Liabilities |  |
Commodity Supply and Price Risk Management | (85.3) | (143.9)
Netting | 0.0 | 0.0
Net Amount Recorded as a Derivative | $ (85.3) | $ (143.9)

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