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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash Paid During the Year for: |  |  |
Interest, Net of Amounts Capitalized | $ 568.7 | $ 518.0 | $ 532.4
Income Taxes | 121.6 | 48.9 | 56.0
Non-Cash Investing Activities: |  |  |
Plant additionsincluded in accounts payable (as of) | 467.9 | 367.2 | 379.4
The Connecticut Light and Power Company |  |  |
Cash Paid During the Year for: |  |  |
Interest, Net of Amounts Capitalized | 161.5 | 149.0 | 144.6
Income Taxes | 38.4 | 10.9 | 80.6
Non-Cash Investing Activities: |  |  |
Plant additionsincluded in accounts payable (as of) | 110.6 | 101.8 | 111.3
NSTAR Electric Company |  |  |
Cash Paid During the Year for: |  |  |
Interest, Net of Amounts Capitalized | 141.6 | 129.4 | 121.9
Income Taxes | 74.2 | 110.7 | 77.9
Non-Cash Investing Activities: |  |  |
Plant additionsincluded in accounts payable (as of) | 120.0 | 103.2 | 116.4
Public Service Company of New Hampshire |  |  |
Cash Paid During the Year for: |  |  |
Interest, Net of Amounts Capitalized | 56.5 | 54.5 | 56.9
Income Taxes | 51.1 | 34.2 | 3.4
Non-Cash Investing Activities: |  |  |
Plant additionsincluded in accounts payable (as of) | $ 68.7 | $ 33.3 | $ 49.9

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