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DERIVATIVE INSTRUMENTS - BALANCE SHEET OFFSETTING (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Cash collateral    
Cash collateral received in margin accounts $ 14.6  
Cash collateral posted in margin accounts   $ 34.4
Offsetting derivative assets    
Gross amount recognized on the balance sheet 40.1 6.9
Gross amount not offset on the balance sheet (15.6) (1.4)
Net amount 24.5 5.5
Collateral received 14.6  
Offsetting derivative liabilities    
Gross amount recognized on the balance sheet 15.5 28.9
Gross amount not offset on the balance sheet (1.0) (21.4)
Net amount $ 14.5 7.5
Collateral posted   $ 20.0