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REGULATION - REGULATORY FILINGS (Details) - Natural Gas Distribution $ in Millions |  |  |  |  |  |  | 3 Months Ended | 5 Months Ended | 6 Months Ended
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Jul. 17, 2019 USD ($) | Jul. 02, 2019 USD ($) | Jun. 24, 2019 USD ($) | May 31, 2019 USD ($) | Mar. 29, 2019 USD ($) | Feb. 28, 2019 USD ($) project_component | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($)
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 128.2 |  |  |  |
Energy Efficiency EE |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ (8.8)
BGSS/CIP Filing |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Interim rate increase (decrease), amount |  |  |  |  |  |  |  | $ 10.9 |
Infrastructure Investment Program (IIP) |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Number of project components | project_component |  |  |  |  |  | 2 |  |  |
Investment |  |  |  |  |  | $ 507.0 |  |  |
Program term |  |  |  |  |  | 5 years |  |  |
RAC |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  | $ 1.4 |  |
NJCEP |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  | $ 1.9 |  |
NJ RISE and SAFE II |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | 8.7 |  |  |  |
Investment cost |  |  |  |  | $ 75.0 |  |  |  |
BPU |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 3.5 |  |  |  |  |
Requested return on return, percentage |  |  |  |  | 7.87% |  |  |  |
BGSS |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | (6.8) |  |  |  |  |
BGSS Balancing |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | 15.6 |  |  |  |  |
Conservation Incentive Program |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 12.8 |  |  |  |  |
June 2019 Annual USF Compliance Filing |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 1.2 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 129.8 |  |  |  |  |  |  |
Subsequent Event | NJ RISE and SAFE II |  |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |  |
Revised rate increase (decrease), amount | $ 7.8 |  |  |  |  |  |  |  |

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