Annual report pursuant to Section 13 and 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation) (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability $ 4.3 $ 3.7
Derivative Asset 45.8 91.5
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability 1.1 0.0
Derivative Asset 45.8 91.4
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance - January 1 91.4 49.5
Included in earnings 78.6 428.7
Settlements (124.2) (386.8)
Ending balance - December 31 45.8 91.4
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) on assets still held at the reporting date 45.8 91.4
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance - January 1 0.0 (1.7)
Included in earnings (71.1) (6.1)
Settlements 70.0 7.8
Ending balance - December 31 (1.1) 0.0
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) on liabilities still held at the reporting date $ (1.1) $ 0.0