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LEASES - Future Minimum Rental Payments under Capital Leases (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Capital Leased Assets [Line Items]  
2019 $ 3.4
2020 3.4
2021 2.9
2022 1.5
2023 0.7
Thereafter 13.9
Future minimum lease payments 25.8
Less amount representing interest 13.8
Present value of future minimum lease payments 12.0
CL&P  
Capital Leased Assets [Line Items]  
2019 2.0
2020 2.0
2021 1.5
2022 0.0
2023 0.0
Thereafter 0.0
Future minimum lease payments 5.5
Less amount representing interest 1.0
Present value of future minimum lease payments 4.5
NSTAR Electric  
Capital Leased Assets [Line Items]  
2019 0.5
2020 0.5
2021 0.5
2022 0.6
2023 0.6
Thereafter 13.4
Future minimum lease payments 16.1
Less amount representing interest 12.4
Present value of future minimum lease payments 3.7
PSNH  
Capital Leased Assets [Line Items]  
2019 0.1
2020 0.1
2021 0.1
2022 0.1
2023 0.1
Thereafter 0.5
Future minimum lease payments 1.0
Less amount representing interest 0.1
Present value of future minimum lease payments $ 0.9