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, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 272.5 $ 543.4
Derivative assets 72.8 91.5
Assets, Fair Value Disclosure 345.3 634.9
Derivative liability 32.6 3.7
Liabilities, Fair Value Disclosure 32.6 3.7
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0.0 0.8
Derivative assets 0.0 0.0
Assets, Fair Value Disclosure 0.0 0.8
Derivative liability 0.0 0.0
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 272.5 542.6
Derivative assets 0.0 0.1
Assets, Fair Value Disclosure 272.5 542.7
Derivative liability 2.4 3.7
Liabilities, Fair Value Disclosure 2.4 3.7
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0.0 0.0
Derivative assets 72.8 91.4
Assets, Fair Value Disclosure 72.8 91.4
Derivative liability 30.2 0.0
Liabilities, Fair Value Disclosure $ 30.2 $ 0.0