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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash Paid During the Year for: |  |  |
Interest, Net of Amounts Capitalized | $ 783.2 | $ 636.2 | $ 568.7
Income Taxes | 39.2 | 77.9 | 121.6
Non-Cash Investing Activities: |  |  |
Plant Additions Included in Accounts Payable (As of) | 564.1 | 586.9 | 467.9
CL&P |  |  |
Cash Paid During the Year for: |  |  |
Interest, Net of Amounts Capitalized | 176.8 | 167.2 | 161.5
Income Taxes | (44.1) | 117.6 | 38.4
Non-Cash Investing Activities: |  |  |
Plant Additions Included in Accounts Payable (As of) | 139.8 | 131.8 | 110.6
NSTAR Electric |  |  |
Cash Paid During the Year for: |  |  |
Interest, Net of Amounts Capitalized | 182.8 | 152.8 | 141.6
Income Taxes | 31.3 | 23.8 | 74.2
Non-Cash Investing Activities: |  |  |
Plant Additions Included in Accounts Payable (As of) | 178.9 | 184.3 | 120.0
PSNH |  |  |
Cash Paid During the Year for: |  |  |
Interest, Net of Amounts Capitalized | 62.8 | 58.3 | 56.5
Income Taxes | (59.9) | 58.3 | 51.1
Non-Cash Investing Activities: |  |  |
Plant Additions Included in Accounts Payable (As of) | $ 65.9 | $ 76.2 | $ 68.7

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