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LEASES - RIGHT OF USE ASSETS (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Operating lease right of use assets $ 44.7 $ 49.0  
Finance lease      
Lessee, Lease, Description [Line Items]      
Long-term power purchase commitment 140.3   $ 140.3
Accumulated amortization (123.7)   (120.9)
Total finance lease right of use asset/capital lease asset $ 16.6   $ 19.4