Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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-Name Regulation S-X (SX)

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-Name Regulation S-X (SX)

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-Name Accounting Standards Codification

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-SubTopic 10

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Insurance Subsidiaries - Dividends Restrictions and Approved Distributions (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended			0 Months Ended		1 Months Ended	0 Months Ended	1 Months Ended		0 Months Ended
	May 08, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 19, 2014	Dec. 22, 2014	Dec. 31, 2013	Jun. 24, 2014	Jun. 30, 2014	May 31, 2014	Dec. 09, 2014
Statutory Accounting Practices [Line Items]
Dividends Paid		$ 10.1us-gaap_DividendsCommonStockCash	$ 5.2us-gaap_DividendsCommonStockCash	$ 0us-gaap_DividendsCommonStockCash
Contributions from (distributions to) participants in consolidated investment entities	1,400.0	1,624.9	1,197.3	1,262.0
Voya Insurance and Annuity Company
Statutory Accounting Practices [Line Items]
Dividends Paid					409.0
Voya Insurance and Annuity Company \| Iowa
Statutory Accounting Practices [Line Items]
Dividends Permitted Without Approval		394.1	216.3	0			216.3
Dividends Paid		216.0	0		216.0
Return of Capital Distributions		0	230.0
Voya Retirement Insurance and Annuity Company \| Connecticut
Statutory Accounting Practices [Line Items]
Dividends Permitted Without Approval		321.8	371.4	264.1			371.4
Dividends Paid	174.0	371.0	264.0		281.0	90.0	90.0
Return of Capital Distributions		0	0
Security Life of Denver Insurance Company (SLD) \| Colorado
Statutory Accounting Practices [Line Items]
Dividends Permitted Without Approval		111.6	32.5	0			32.5
Dividends Paid			0					32.0	32.0
Return of Capital Distributions		0	447.0
ReliaStar Life Insurance Company (RLI) \| Minnesota
Statutory Accounting Practices [Line Items]
Dividends Permitted Without Approval		194.2	194.0	0			194.0
Dividends Paid		193.0	0							193.0
Return of Capital Distributions		0	583.0
Principal Insurance Subsidiaries
Statutory Accounting Practices [Line Items]
Dividends Paid					690.0
Negative unassigned funds account, balance reset				0
No Further Extraordinary Distributions Approved before June 26, 2013
Statutory Accounting Practices [Line Items]
Dividends Permitted Without Approval			264.1				264.1
No Further Extraordinary Distributions Approved before May 8, 2014
Statutory Accounting Practices [Line Items]
Dividends Permitted Without Approval		281.4
No Further Extraordinary Distributions Approved before December 9, 2014
Statutory Accounting Practices [Line Items]
Dividends Paid											90.0
No Further Extraordinary Distributions Approved Before May 19, 2015
Statutory Accounting Practices [Line Items]
Dividends Permitted Without Approval		231.8
No Further Extraordinary Distributions Approved before December 22, 2015
Statutory Accounting Practices [Line Items]
Dividends Permitted Without Approval		$ 90.0
Insurance Laws Applicable to Insurance Subsidiaries in Connecticut, Indiana. Iowa, and Minnesota
Statutory Accounting Practices [Line Items]
Percentage threshold of dividends paid in previous twelve months to earned statutory surplus of prior year end, requiring approval of payment of dividends if exceeded		10.00%
Insurance Laws Applicable to Insurance Subsidiaries in Colorado
Statutory Accounting Practices [Line Items]
Percentage threshold of dividends paid in previous twelve months to earned statutory surplus of prior year end, requiring approval of payment of dividends if exceeded		10.00%
Insurance Laws Applicable to Insurance Subsidiaries in New York
Statutory Accounting Practices [Line Items]
Percentage threshold of dividends paid in previous twelve months to earned statutory surplus of prior year end, requiring approval of payment of dividends if exceeded		10.00%