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EMPLOYEE BENEFITS - Schedule of Compensation Expense and Income Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	$ 30.0	$ 27.8	$ 33.4
Future Income Tax Benefit	7.8	7.3	8.7
CL&P
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	9.3	8.7	10.0
Future Income Tax Benefit	2.4	2.3	2.6
NSTAR Electric
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	9.6	8.7	10.7
Future Income Tax Benefit	2.5	2.3	2.8
PSNH
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	3.6	3.0	3.6
Future Income Tax Benefit	$ 0.9	$ 0.8	$ 0.9

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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