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Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES (Narrative) (Details)

v3.10.0.1
COMMITMENTS AND CONTINGENCIES (Narrative) (Details)
$ in Millions, $ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
CAD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items] Ìý Ìý Ìý Ìý
Loans to and accounts receivable from the Canadian Entities $ 0.0 Ìý $ 51.6 $ 51.6
Cash contribution Ìý $ 19.0 Ìý Ìý
Michigan Electricity Matters [Member] Ìý Ìý Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý Ìý Ìý
Loss Contingency Accrual 10.8 Ìý Ìý $ 13.0
Loss Contingency Accrual, Period Increase (Decrease) $ 2.2 Ìý Ìý Ìý