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DERIVATIVE INSTRUMENTS - BALANCE SHEET OFFSETTING (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Cash collateral |  |
Cash collateral in margin account | $ 6.8 | $ 16.2
Cash collateral received in margin account | 0.1 |
Offsetting Derivative Assets |  |
Gross amount recognized on the balance sheet | 23.0 | 12.4
Gross amount not offset on the balance sheet | (3.7) | (4.9)
Net amount | 19.3 | 7.5
Collateral received | 0.1 |
Offsetting Derivative Liabilities |  |
Gross amount recognized on the balance sheet | 4.9 | 11.6
Gross amount not offset on the balance sheet | (3.6) | (9.0)
Net amount | $ 1.3 | 2.6
Collateral posted |  | 4.1
Credit Risk Related Contingent Features |  |
Aggregate fair value of all derivative instruments with specific credit risk-related contingent fearures in a net liability position |  | 3.7
Additional collateral that would have been required |  | $ 2.7

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