Financing Agreements (Details) - Affiliated Entity - Voya Financial, Inc. - Reciprocal Loan Agreement - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 01, 2001
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity, as a percent					3.00%
Interest income	$ 0.5	$ 0.2	$ 0.7	$ 0.2