Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Fair Value of Assets and Liabilities) (Details)

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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Fair Value of Assets and Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 135.0 $ 177.0
Derivative Asset 59.4 33.1
Loans to and accounts receivable from the Canadian Entities 49.0 48.6
Total Asset 243.4 258.7
Derivative Liability 9.1 0.5
Contingent Liabilities recognized in Consolidated Financials 37.5 37.2
Total Liability 46.6 37.7
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 90.0 177.0
Derivative Asset 0.0 0.0
Loans to and accounts receivable from the Canadian Entities 0.0 0.0
Total Asset 90.0 177.0
Derivative Liability 0.0 0.0
Contingent Liabilities recognized in Consolidated Financials 0.0 0.0
Total Liability 0.0 0.0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 45.0 0.0
Derivative Asset 0.0 1.5
Loans to and accounts receivable from the Canadian Entities 0.0 0.0
Total Asset 45.0 1.5
Derivative Liability 0.0 0.0
Contingent Liabilities recognized in Consolidated Financials 0.0 0.0
Total Liability 0.0 0.0
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0.0 0.0
Derivative Asset 59.4 31.6
Loans to and accounts receivable from the Canadian Entities 49.0 48.6
Total Asset 108.4 80.2
Derivative Liability 9.1 0.5
Contingent Liabilities recognized in Consolidated Financials 37.5 37.2
Total Liability $ 46.6 $ 37.7