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DERIVATIVE INSTRUMENTS - BALANCE SHEET OFFSETTING (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Cash collateral    
Cash collateral posted in margin accounts $ 28.3 $ 2.7
Cash collateral received in margin accounts   0.2
Offsetting derivative assets    
Gross amount recognized on the balance sheet 15.7 15.9
Gross amount not offset on the balance sheet (5.7) (4.0)
Net amount 10.0 11.9
Collateral received   0.2
Offsetting derivative liabilities    
Gross amount recognized on the balance sheet 31.6 7.9
Gross amount not offset on the balance sheet (23.9) (4.9)
Net amount 7.7 3.0
Collateral posted $ 18.2 $ 1.1