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LEASES - Components of Lease Cost (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Lease, Cost [Abstract] |  |  |
Amortization of Right-of-use-Assets | $ 8.3 | $ 4.6 | $ 2.6
Interest on Lease Liabilities | 2.0 | 3.9 | 1.4
Total Finance Lease Cost | 10.3 | 8.5 | 4.0
Operating Lease Cost | 11.6 | 12.2 | 11.1
Variable Lease Cost | 78.1 | 61.0 | 57.8
Total Lease Cost | 100.0 | 81.7 | 72.9
CL&P |  |  |
Lease, Cost [Abstract] |  |  |
Amortization of Right-of-use-Assets | 0.0 | 0.5 | 0.7
Interest on Lease Liabilities | 0.0 | 0.1 | 0.3
Total Finance Lease Cost | 0.0 | 0.6 | 1.0
Operating Lease Cost | 0.3 | 0.3 | 0.6
Variable Lease Cost | 25.6 | 16.2 | 12.2
Total Lease Cost | 25.9 | 17.1 | 13.8
NSTAR Electric |  |  |
Lease, Cost [Abstract] |  |  |
Amortization of Right-of-use-Assets | 0.2 | 0.2 | 0.2
Interest on Lease Liabilities | 0.6 | 0.6 | 0.6
Total Finance Lease Cost | 0.8 | 0.8 | 0.8
Operating Lease Cost | 2.3 | 2.3 | 2.1
Variable Lease Cost | 0.0 | 0.0 | 0.0
Total Lease Cost | 3.1 | 3.1 | 2.9
PSNH |  |  |
Lease, Cost [Abstract] |  |  |
Amortization of Right-of-use-Assets | 0.1 | 0.1 | 0.1
Interest on Lease Liabilities | 0.0 | 0.0 | 0.0
Total Finance Lease Cost | 0.1 | 0.1 | 0.1
Operating Lease Cost | 0.1 | 0.1 | 0.1
Variable Lease Cost | 52.5 | 44.8 | 45.6
Total Lease Cost | $ 52.7 | $ 45.0 | $ 45.8

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- Definition Finance Lease, Cost + References No definition available. + Details
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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
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- Definition Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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