SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) number in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items]
Number of natural gas distribution services customers	2.2		2.2
Segment Reporting, Disclosure of Major Customers	0	0	0	0
Capital Expenditures Incurred but Not yet Paid			$ 1.7	$ 11.5
Operating Lease, Right-of-Use Asset	$ 35.8		35.8		$ 32.0
Operating Lease, Liability	$ 35.7		$ 35.7		$ 32.0