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
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance - January 1 $ 7.8 $ 63.2
Total gains    
Included in earnings 11.2 10.1
Settlements (10.0) (38.8)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Ending balance - March 31 9.0 34.5
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date 3.6 10.1
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance - January 1 (3.4) (9.5)
Total gains    
Included in earnings (5.6) (16.2)
Settlements 2.8 9.5
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Ending balance - March 31 (6.2) (16.2)
Total losses for the period included in earnings attributable to the change in unrealized losses on liabilities still held at the reporting date $ (4.4) $ (16.2)