Quarterly report pursuant to Section 13 or 15(d)

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

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FAIR VALUE MEASUREMENTS (Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance $ 174.6 $ 70.2 $ 49.5 $ 30.1
Total gains        
Included in earnings 139.0 54.0 341.8 138.5
Settlements (123.0) (35.2) (200.7) (79.6)
Ending balance - September 30 190.6 89.0 190.6 89.0
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date 15.9 52.9 141.0 63.1
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance (3.0) (20.3) (1.7) 0.0
Total losses        
Included in earnings (3.1) (15.3) (7.4) (35.6)
Settlements 0.4 30.2 3.4 30.2
Ending balance - September 30 (5.7) (5.4) (5.7) (5.4)
Total losses for the period included in earnings attributable to the change in unrealized losses on liabilities still held at the reporting date $ (2.7) $ (10.9) $ (5.7) $ (6.4)