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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Credit Concentrations in Industry Sectors) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Net Total $ (374.0) $ (160.9)
Cash collateral held 16.2 28.4
United States Financial Institutions And Investment Banking Entities [Member]    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Credit concentrations [1] (251.1) (147.1)
Cash collateral held 16.2 28.4
Non United States Financial Institutions [Member]    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Credit concentrations (149.9) (54.2)
Other [Member]    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Credit concentrations $ 27.0 $ 40.4
[1] Includes $16.2 million and $28.4 million held of cash collateral at September 30, 2015 and December 31, 2014, respectively.