Related Party Transactions - Operating Agreements and Investment Advisory and Other Fees (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Earning related to agreements	$ 724.6	$ 765.3	$ 784.1
Commissions collected	175.4	229.7	244.9
Voya Investment Management LLC
Related Party Transaction [Line Items]
Expenses incurred	57.6	51.5	50.2
Earning related to agreements	33.3	35.0	31.9
Voya Services Company
Related Party Transaction [Line Items]
Asset management, administrative and accounting services fees	264.7	235.1	197.7
US Insurance Company and Affiliates
Related Party Transaction [Line Items]
Expenses incurred	44.5	26.7	26.9
Voya Institutional Plan Services, LLC (VIPS)
Related Party Transaction [Line Items]
Earning related to agreements	5.4	7.5	8.1
Voya Financial Advisors, Inc
Related Party Transaction [Line Items]
Commission expenses incurred	73.4	74.0	71.6
Voya Insurance and Annuity Company (VIAC) and ReliaStar Life Insurance Company of New York (RLNY), and Affiliated Companies \| DSL
Related Party Transaction [Line Items]
Commissions collected	175.4	229.7	244.9
VIAC, VIPS, ReliaStar Life Insurance Company and Security Life of Denver Insurance Company \| DSL
Related Party Transaction [Line Items]
Expenses incurred	123.2	206.5	231.5
ReliaStar Life Insurance Company \| DSL
Related Party Transaction [Line Items]
Expenses incurred	2.9	2.8	3.3
Voya Investments, LLC and Voya Investment Management, LLC, and Affiliated Companies \| DSL
Related Party Transaction [Line Items]
Asset management, administrative and accounting services fees	69.8	67.8	45.5
Voya Investors Trust \| DSL
Related Party Transaction [Line Items]
Due from affiliates	29.7	30.1
Affiliated entity \| Voya Financial Partners, LLC (VFP)
Related Party Transaction [Line Items]
Distribution revenues	25.4	26.1	24.7
Affiliated entity \| DSL
Related Party Transaction [Line Items]
Earning related to agreements	$ 350.3	$ 379.7	$ 414.3

Amount of commission revenue from buying and selling securities on behalf of customers.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 05
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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