Quarterly report pursuant to Section 13 or 15(d)

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

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FAIR VALUE MEASUREMENTS (Fair Value of Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents $ 596.9   $ 616.9
Derivative assets 190.8 $ 49.5 37.9
Total Asset 787.7   654.8
Derivative liability 5.8   2.0
Total Liability 5.8   2.0
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents 0.7   66.3
Derivative assets 0.0   0.0
Total Asset 0.7   66.3
Derivative liability 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 596.2   550.6
Derivative assets 0.2   0.0
Total Asset 596.4   550.6
Derivative liability 0.1   0.3
Total Liability 0.1   0.3
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash equivalents 0.0   0.0
Derivative assets 190.6   37.9
Total Asset 190.6   37.9
Derivative liability 5.7   1.7
Total Liability $ 5.7   $ 1.7