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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

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