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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
Mar. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items] Ìý Ìý
Loans to and accounts receivable from the Canadian Entities $ 49.0 $ 48.6
Contingent Liabilities recognized in Consolidated Financials 37.5 37.2
Michigan Electricity Matters [Member] Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý
Loss Contingency Accrual 13.6 Ìý
Fair Value, Inputs, Level 3 [Member] Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý
Loans to and accounts receivable from the Canadian Entities 49.0 48.6
Contingent Liabilities recognized in Consolidated Financials $ 37.5 $ 37.2