LEASES - TWO CREEKS SOLAR PARK (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) a extension	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Finance lease obligation	$ 31.3	$ 30.7
Two Creeks
Lessee, Lease, Description [Line Items]
Solar land lease acreage | a	900
Lease initial term	30 years
Number of contract extensions | extension	2
Renewal term	10 years
Lease extended term	50 years
Finance lease obligation	$ 11.0
Finance lease obligation at end of life of solar land contract	$ 0.0