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DERIVATIVE INSTRUMENTS - Gross Fair Values and Net Amounts of Contracts (Details) - CL&P - Level 2 - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Current Derivative Assets |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Commodity Supply and Price Risk Management | $ 15.5 | $ 16.4
Netting | (0.4) | (0.5)
Net Amount Recorded as a Derivative | 15.1 | 15.9
Long-Term Derivative Assets |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Commodity Supply and Price Risk Management | 2.5 | 13.6
Netting | (0.2) | (0.5)
Net Amount Recorded as a Derivative | 2.3 | 13.1
Current Derivative Liabilities |  |
Current and Long-Term Derivative Liabilities |  |
Commodity Supply and Price Risk Management | (77.5) | (81.9)
Netting | 0.0 | 0.0
Net Amount Recorded as a Derivative | (77.5) | (81.9)
Long-Term Derivative Liabilities |  |
Current and Long-Term Derivative Liabilities |  |
Commodity Supply and Price Risk Management | (12.5) | (68.0)
Netting | 0.0 | 0.0
Net Amount Recorded as a Derivative | $ (12.5) | $ (68.0)

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