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Benefit Plans - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Adjustment to pension benefit plans, net of taxes | $ 216,000 | $ (2,151,000) | $ (716,000)
Value of life insurance contracts | 3,937,000 | 3,420,000 |
Annual maximum contribution limit under Health Care Spending Account plan | 3,100 |  |
Annual maximum contribution limit under Dependent Care Spending Account plan | 5,000 |  |
Employer contributions to deferral plan | $ 3,902,000 | 3,003,000 | 2,822,000
Health care cost trend rate assumed, next fiscal year | 8.00% |  |
Ultimate health care cost trend rate | 4.50% |  |
Actuarial gain (loss), discount rate change | $ (1,188,000) | 116,372,000 |
Actuarial gain (loss), data and other changes | (1,993,000) | (12,422,000) |
Actuarial gain (loss), mortality change | (168,000) | 4,000 |
Defined benefit plan, accumulated benefit obligation | 270,209,000 | 259,838,000 |
Unrecognized pensions and other postretirement benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Regulatory liabilities | 20,196,000 | 14,307,000 |
Other comprehensive income (loss), defined benefit plan, gain (loss) arising during period | 20,196,000 | 14,307,000 |
Unrecognized pensions and other postretirement benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Regulatory assets | 24,593,000 | 45,799,000 |
Other comprehensive income (loss), defined benefit plan, gain (loss) arising during period | (24,552,000) | (45,743,000) |
Other comprehensive (income) loss, defined benefit plan, prior service cost (credit) | 41,000 | 56,000 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 297,834,000 | 289,123,000 | 383,838,000
Net periodic pension cost | 8,588,000 | 4,268,000 | 8,068,000
Total investments made to fund SERP | 11,145,000 | 11,712,000 |
Executive Supplemental Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 43,001,000 | 39,455,000 |
Net periodic pension cost | 3,257,000 | 4,400,000 | 4,456,000
Adjustment to pension benefit plans, net of taxes | 314,000 | 1,640,000 | $ 901,000
Total investments made to fund SERP | $ 6,843,000 | $ 6,395,000 |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Period for performance standards | 3 years |  |
Minimum | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost, expected return on plan assets | 6.00% | 6.50% | 6.50%
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Period for performance standards | 5 years |  |
Maximum | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost, expected return on plan assets | 6.75% | 6.75% | 6.75%
CTWS Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase to company sponsored savings plan | 1.50% |  |
Executives and Non-employee Directors | Deferred compensation arrangement with individual, by type of compensation, pension and other postretirement benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Deferrals by executives and non-employee directors | $ 8,148,000 | $ 6,197,000 |
Executives and Non-employee Directors | Deferred compensation arrangement with individual, by type of compensation, pension and other postretirement benefits | Connecticut Water Company |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Deferrals by executives and non-employee directors | $ 6,223,000 | $ 4,508,000 |

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