Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES Narrative (Details)

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COMMITMENTS AND CONTINGENCIES Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]    
Loans to and accounts receivable from the Canadian Entities $ 50.1 $ 48.6
Contingent claims 50.0 0.0
Contingent Liabilities recognized in Consolidated Financials 38.5 37.2
Michigan Electricity Matters [Member]    
Loss Contingencies [Line Items]    
Loss Contingency Accrual 13.6  
Fair Value, Inputs, Level 3 [Member]    
Loss Contingencies [Line Items]    
Loans to and accounts receivable from the Canadian Entities 50.1 48.6
Contingent Liabilities recognized in Consolidated Financials $ 38.5 $ 37.2