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Derivative Instruments - Balance Sheeet Offsetting (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Offsetting Derivative Assets
Gross amount recognized on the balance sheet	$ 12.4	$ 41.6
Gross amount not offset on the balance sheet	(4.9)	(4.9)
Net amount	7.5	36.7
Cash collateral received		4.4
Offsetting Derivative Liabilities
Gross amount recognized on balance sheet	11.6	2.4
Gross amount not offset on the balance sheet	(9.0)	(0.5)
Net amount	2.6	1.9
Cash collateral posted	4.1
Cash collateral
Cash collateral in margin account	16.2	16.4
Cash collateral received		4.4
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	$ 0.2
Collateral that would have been required	$ 2.7

X

- Definition

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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