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INCOME TAXES - Temporary Differences That Give Rise To Accumulated Deferred Income Tax Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Deferred Tax Assets: |  |
Employee Benefits | $ 228.9 | $ 270.8
Derivative Liabilities | 53.8 | 76.8
Regulatory Deferrals - Liabilities | 529.5 | 390.7
Allowance for Uncollectible Accounts | 125.5 | 104.1
Tax Effect - Tax Regulatory Liabilities | 762.9 | 783.4
Net Operating Loss Carryforwards | 16.7 | 7.5
Purchase Accounting Adjustment | 62.0 | 67.2
Other | 176.6 | 196.6
Total Deferred Tax Assets | 1,955.9 | 1,897.1
Less: Valuation Allowance | 82.8 | 61.5
Net Deferred Tax Assets | 1,873.1 | 1,835.6
Deferred Tax Liabilities: |  |
Accelerated Depreciation and Other Plant-Related Differences | 4,793.7 | 4,426.0
Property Tax Accruals | 95.3 | 88.1
Regulatory Amounts: |  |
Regulatory Deferrals - Assets | 1,251.9 | 1,260.3
Tax Effect - Tax Regulatory Assets | 271.7 | 257.8
Goodwill-related Regulatory Asset - 1999 Merger | 76.8 | 81.4
Employee Benefits | 305.5 | 174.7
Derivative Assets | 10.5 | 14.9
Other | 135.6 | 129.5
Total Deferred Tax Liabilities | 6,941.0 | 6,432.7
CL&P |  |
Deferred Tax Assets: |  |
Employee Benefits | 25.3 | 23.9
Derivative Liabilities | 53.8 | 76.8
Regulatory Deferrals - Liabilities | 146.6 | 90.9
Allowance for Uncollectible Accounts | 60.5 | 48.8
Tax Effect - Tax Regulatory Liabilities | 324.6 | 328.2
Net Operating Loss Carryforwards | 0.0 | 0.0
Purchase Accounting Adjustment | 0.0 | 0.0
Other | 109.5 | 103.9
Total Deferred Tax Assets | 720.3 | 672.5
Less: Valuation Allowance | 63.3 | 44.5
Net Deferred Tax Assets | 657.0 | 628.0
Deferred Tax Liabilities: |  |
Accelerated Depreciation and Other Plant-Related Differences | 1,602.0 | 1,509.5
Property Tax Accruals | 40.7 | 40.5
Regulatory Amounts: |  |
Regulatory Deferrals - Assets | 406.4 | 438.3
Tax Effect - Tax Regulatory Assets | 185.6 | 181.4
Goodwill-related Regulatory Asset - 1999 Merger | 0.0 | 0.0
Employee Benefits | 45.0 | 3.5
Derivative Assets | 10.5 | 14.9
Other | 6.8 | 2.0
Total Deferred Tax Liabilities | 2,297.0 | 2,190.1
NSTAR Electric |  |
Deferred Tax Assets: |  |
Employee Benefits | 57.4 | 40.3
Derivative Liabilities | 0.0 | 0.0
Regulatory Deferrals - Liabilities | 285.7 | 215.4
Allowance for Uncollectible Accounts | 20.7 | 21.5
Tax Effect - Tax Regulatory Liabilities | 241.8 | 254.3
Net Operating Loss Carryforwards | 0.0 | 0.0
Purchase Accounting Adjustment | 0.0 | 0.0
Other | 20.5 | 21.7
Total Deferred Tax Assets | 626.1 | 553.2
Less: Valuation Allowance | 0.0 | 0.0
Net Deferred Tax Assets | 626.1 | 553.2
Deferred Tax Liabilities: |  |
Accelerated Depreciation and Other Plant-Related Differences | 1,643.7 | 1,553.7
Property Tax Accruals | 41.3 | 33.7
Regulatory Amounts: |  |
Regulatory Deferrals - Assets | 407.9 | 337.6
Tax Effect - Tax Regulatory Assets | 10.7 | 10.9
Goodwill-related Regulatory Asset - 1999 Merger | 65.9 | 69.9
Employee Benefits | 140.8 | 107.1
Derivative Assets | 0.0 | 0.0
Other | 16.7 | 19.8
Total Deferred Tax Liabilities | 2,327.0 | 2,132.7
PSNH |  |
Deferred Tax Assets: |  |
Employee Benefits | 11.6 | 14.1
Derivative Liabilities | 0.0 | 0.0
Regulatory Deferrals - Liabilities | 42.1 | 24.3
Allowance for Uncollectible Accounts | 7.9 | 6.2
Tax Effect - Tax Regulatory Liabilities | 97.8 | 100.9
Net Operating Loss Carryforwards | 0.0 | 0.0
Purchase Accounting Adjustment | 0.0 | 0.0
Other | 21.3 | 22.9
Total Deferred Tax Assets | 180.7 | 168.4
Less: Valuation Allowance | 0.0 | 0.0
Net Deferred Tax Assets | 180.7 | 168.4
Deferred Tax Liabilities: |  |
Accelerated Depreciation and Other Plant-Related Differences | 523.8 | 482.9
Property Tax Accruals | 6.7 | 6.3
Regulatory Amounts: |  |
Regulatory Deferrals - Assets | 165.2 | 198.4
Tax Effect - Tax Regulatory Assets | 7.9 | 8.3
Goodwill-related Regulatory Asset - 1999 Merger | 0.0 | 0.0
Employee Benefits | 18.7 | 0.7
Derivative Assets | 0.0 | 0.0
Other | 21.2 | 9.8
Total Deferred Tax Liabilities | $ 743.5 | $ 706.4

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