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EMPLOYEE BENEFITS - Schedule of Compensation Expense and Income Tax Benefit (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation Expense | $ 28.2 | $ 33.9 | $ 27.3
Future Income Tax Benefit | 7.3 | 8.9 | 7.0
The Connecticut Light and Power Company |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation Expense | 8.8 | 10.9 | 9.8
Future Income Tax Benefit | 2.3 | 2.9 | 2.5
NSTAR Electric Company |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation Expense | 9.0 | 11.3 | 9.7
Future Income Tax Benefit | 2.3 | 3.0 | 2.5
Public Service Company of New Hampshire |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation Expense | 3.0 | 3.6 | 3.3
Future Income Tax Benefit | $ 0.8 | $ 1.0 | $ 0.8

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