LEASES - RIGHT OF USE ASSETS (Details) $ in Millions	Dec. 31, 2019 USD ($)
Right of use assets
Total finance lease right of use asset	$ 30.0
Two Creeks Solar Project
Right of use assets
Under finance lease	10.8
Accumulated amortization	(0.1)
Total finance lease right of use asset	10.7
Badger Hollow Solar Farm I
Right of use assets
Under finance lease	19.5
Accumulated amortization	(0.2)
Total finance lease right of use asset	$ 19.3