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Derivative Instruments - Balance Sheet Offsetting (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Derivative Assets |  |
Gross amount recognized on the balance sheet | $ 15.9 | $ 12.4
Gross amount not offset on the balance sheet | (4.0) | (4.9)
Net amount | 11.9 | 7.5
Cash collateral received | 0.2 |
Offsetting Derivative Liabilities |  |
Gross amount recognized on balance sheet | 7.9 | 11.6
Gross amount not offset on the balance sheet | (4.9) | (9.0)
Net amount | 3.0 | 2.6
Cash collateral posted | 1.1 | 4.1
Cash collateral |  |
Cash collateral in margin account | 2.7 | 16.2
Cash collateral received | $ 0.2 |
Credit Risk Related Contingent Features |  |
Aggregate fair value of derivative instruments with credit risk-related contingent features that were in a liability position |  | 3.7
Collateral that would have been required |  | $ 2.7

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