Quarterly report pursuant to Section 13 or 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
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance - January 1 $ 7.7 $ 33.0 $ 63.2 $ 57.7
Total gains        
Included in earnings 15.0 62.6 28.1 124.6
Settlements (12.3) (41.1) (80.9) (127.8)
Transfers into Level 3 0.0 0.0 0.0 0.0
Transfers out of Level 3 0.0 0.0 0.0 0.0
Ending balance - September 30 10.4 54.5 10.4 54.5
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date 12.2 62.6 22.7 124.6
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance - January 1 (8.0) (20.2) (9.5) (1.0)
Total gains        
Included in earnings (13.7) 2.3 (45.4) (17.9)
Settlements 20.9 0.0 54.1 1.0
Transfers into Level 3 0.0 0.0 0.0 0.0
Transfers out of Level 3 0.0 0.0 0.0 0.0
Ending balance - September 30 (0.8) (17.9) (0.8) (17.9)
Total gains (losses) for the period included in earnings attributable to the change in unrealized losses on liabilities still held at the reporting date $ (0.5) $ 2.3 $ (0.8) $ (17.9)