Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of assets pledged to secure a debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value amount of debt instrument that was repurchased.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates.

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Financing Agreements - Long-term Debt (Details) - USD ($) $ in Millions				12 Months Ended
	Jul. 12, 2019	Jan. 23, 2018	May 16, 2013	Dec. 31, 2018	Dec. 31, 2019	Nov. 01, 2019	Jul. 05, 2017	Mar. 17, 2015	Jun. 16, 2007
Debt Instrument [Line Items]
Revolving lines of credit, capacity					$ 5,036.0
Total				$ 3,137.0	3,043.0
Current portion of long-term debt				1.0	1.0
Long-term debt				3,136.0	3,042.0
1.00% Windsor Property Loan
Debt Instrument [Line Items]
Cash collateral balance required or remaining					$ 5.0
Senior Notes
Debt Instrument [Line Items]
Annual interest rate on loan								1.875%
Senior Notes \| 2.9% Senior Notes, due 2018
Debt Instrument [Line Items]
Annual interest rate on loan					2.90%
Senior Notes \| 5.5% Senior Notes, due 2022
Debt Instrument [Line Items]
Repayments of long-term debt	$ 97.0			125.0
Total				$ 96.0	$ 0.0
Annual interest rate on loan				5.50%	5.50%
Repurchase amount				$ 141.0
Senior Notes \| 3.125% Senior Notes, due 2024
Debt Instrument [Line Items]
Total				$ 396.0	$ 397.0
Annual interest rate on loan				3.125%	3.125%		3.125%
Amount of unsecured notes issued							$ 400.0
Senior Notes \| 3.65% Senior Notes, due 2026
Debt Instrument [Line Items]
Total				$ 496.0	$ 496.0
Annual interest rate on loan				3.65%	3.65%
Senior Notes \| 5.7% Senior Notes, due 2043
Debt Instrument [Line Items]
Total				$ 395.0	$ 395.0
Annual interest rate on loan				5.70%	5.70%
Senior Notes \| 4.8% Senior Notes, due 2046
Debt Instrument [Line Items]
Total				$ 297.0	$ 297.0
Annual interest rate on loan				4.80%	4.80%
Junior Subordinated Notes \| 4.7% Fixed-to-Floating Rate Junior Subordinated Notes, due 2048
Debt Instrument [Line Items]
Total				$ 344.0	$ 345.0
Annual interest rate on loan		4.70%		4.70%	4.70%
Amount of unsecured notes issued		$ 350.0
Description of variable rate basis		LIBOR
Basis spread		2.084%
Junior Subordinated Notes \| 5.65% Fixed-to-Floating Rate Junior Subordinated Notes, due 2053
Debt Instrument [Line Items]
Total				$ 739.0	$ 739.0
Annual interest rate on loan			5.65%	5.65%	5.65%
Amount of unsecured notes issued			$ 750.0
Description of variable rate basis			LIBOR
Basis spread			3.58%
Debentures \| 7.25% Voya Holdings Inc. debentures, due 2023
Debt Instrument [Line Items]
Total				$ 138.0	$ 139.0
Annual interest rate on loan				7.25%	7.25%
Debentures \| 7.63% Voya Holdings Inc. debentures, due 2026
Debt Instrument [Line Items]
Total				$ 138.0	$ 138.0
Annual interest rate on loan				7.63%	7.63%
Debentures \| 6.97% Voya Holdings Inc. debentures, due 2036
Debt Instrument [Line Items]
Total				$ 79.0	$ 79.0
Annual interest rate on loan				6.97%	6.97%
Debentures \| Voya Holdings Debentures
Debt Instrument [Line Items]
Total				$ 358.0	$ 358.0
Notes Payable \| 8.42% Equitable of Iowa Companies Capital Trust II Notes, due 2027
Debt Instrument [Line Items]
Total				$ 14.0	$ 14.0
Annual interest rate on loan				8.42%	8.42%
Property Loan \| 1.00% Windsor Property Loan
Debt Instrument [Line Items]
Total				$ 5.0	$ 4.0
Annual interest rate on loan				1.00%	1.00%
Amount of unsecured notes issued									$ 10.0
Revolving Credit Agreement
Debt Instrument [Line Items]
Revolving lines of credit, capacity						$ 500.0
Minimum net worth required for compliance						$ 6,150.0