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, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance - January 1 $ 53.3 $ 69.2 $ 62.4 $ 157.9
Total gains        
Included in earnings 32.4 61.4 60.4 104.7
Settlements (40.6) (46.7) (77.7) (178.7)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance - June 30 45.1 83.9 45.1 83.9
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date 32.4 61.4 60.4 104.7
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance - January 1 (6.8) (1.1) (11.3) (19.5)
Total gains        
Included in earnings (25.2) (14.7) (32.0) (15.8)
Settlements 0 0 11.3 19.5
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance - June 30 (32.0) (15.8) (32.0) (15.8)
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 $ (25.2) $ (14.7) $ (32.0) $ (15.8)