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DERIVATIVE INSTRUMENTS - BALANCE SHEET OFFSETTING (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Cash collateral
Cash collateral in margin account	$ 24.7	$ 16.4
Cash collateral received		4.4
Offsetting Derivative Assets
Gross amount recognized on the balance sheet	15.7	41.6
Gross amount not offset on the balance sheet	(3.0)	(4.9)
Net amount	12.7	36.7
Collateral received		4.4
Offsetting Derivative Liabilities
Gross amount recognized on the balance sheet	6.1	2.4
Gross amount not offset on the balance sheet	(3.1)	(0.5)
Net amount	3.0	1.9
Collateral posted	0.1
Credit Risk Related Contingent Features
Aggregate fair value of all derivative instruments with specific credit risk-related contingent fearures in a net liability position	2.3	$ 0.2
Additional collateral that would have been required	$ 0.8

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- 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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