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COMMITMENTS AND CONTINGENCIES - Schedule of Total Costs Incurred (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Long-term Purchase Commitment [Line Items] |  |  |
Renewable Energy Purchase Contracts | $ 678.1 | $ 609.2 | $ 584.2
Natural Gas Procurement | 1,042.8 | 712.7 | 453.4
Purchased Power and Capacity | 61.6 | 56.4 | 62.7
Peaker CfDs | 13.4 | 24.3 | 22.7
Transmission Support Commitments | 12.7 | 15.4 | 22.1
CL&P |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Renewable Energy Purchase Contracts | 513.2 | 457.1 | 426.3
Purchased Power and Capacity | 57.7 | 53.1 | 59.3
Peaker CfDs | 13.4 | 24.3 | 22.7
Transmission Support Commitments | 5.0 | 6.1 | 8.7
NSTAR Electric |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Renewable Energy Purchase Contracts | 90.8 | 84.7 | 88.8
Purchased Power and Capacity | 3.0 | 3.0 | 3.1
Peaker CfDs | 0.0 | 0.0 | 0.0
Transmission Support Commitments | 5.0 | 6.0 | 8.7
PSNH |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Renewable Energy Purchase Contracts | 74.1 | 67.4 | 69.1
Purchased Power and Capacity | 0.9 | 0.3 | 0.3
Peaker CfDs | 0.0 | 0.0 | 0.0
Transmission Support Commitments | $ 2.7 | $ 3.3 | $ 4.7

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