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Investments - Loans by U.S. Region (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 100.00%voya_LoansPercentOfGeographicRegionToTotalLoans 100.00%voya_LoansPercentOfGeographicRegionToTotalLoans
Loans Receivable, Gross, Commercial, Real Estate $ 3,666.1us-gaap_LoansReceivableCommercialRealEstate $ 3,514.1us-gaap_LoansReceivableCommercialRealEstate
Pacific    
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 23.60%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= us-gaap_PacificDestinationMember		 22.80%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= us-gaap_PacificDestinationMember
Loans Receivable, Gross, Commercial, Real Estate 865.2us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= us-gaap_PacificDestinationMember		 802.6us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= us-gaap_PacificDestinationMember
South Atlantic    
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 22.50%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_SouthAtlanticMember		 21.20%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_SouthAtlanticMember
Loans Receivable, Gross, Commercial, Real Estate 824.1us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_SouthAtlanticMember		 746.5us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_SouthAtlanticMember
Middle Atlantic    
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 14.00%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_MiddleAtlanticMember		 14.40%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_MiddleAtlanticMember
Loans Receivable, Gross, Commercial, Real Estate 514.1us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_MiddleAtlanticMember		 505.8us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_MiddleAtlanticMember
East North Central    
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 9.90%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_EastNorthCentralMember		 10.10%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_EastNorthCentralMember
Loans Receivable, Gross, Commercial, Real Estate 364.9us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_EastNorthCentralMember		 355.3us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_EastNorthCentralMember
West South Central    
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 12.10%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_WestSouthCentralMember		 12.80%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_WestSouthCentralMember
Loans Receivable, Gross, Commercial, Real Estate 442.4us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_WestSouthCentralMember		 448.4us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_WestSouthCentralMember
Mountain    
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 7.80%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_MountainMember		 7.80%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_MountainMember
Loans Receivable, Gross, Commercial, Real Estate 284.8us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_MountainMember		 274.0us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_MountainMember
New England    
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 2.10%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_NewEnglandMember		 2.10%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_NewEnglandMember
Loans Receivable, Gross, Commercial, Real Estate 77.2us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_NewEnglandMember		 74.8us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_NewEnglandMember
West North Central    
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 5.90%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_WestNorthCentralMember		 6.30%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_WestNorthCentralMember
Loans Receivable, Gross, Commercial, Real Estate 216.5us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_WestNorthCentralMember		 219.6us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_WestNorthCentralMember
East South Central    
Open Option Contracts Written [Line Items]    
Loans by region percentage of total loans 2.10%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_EastSouthCentralMember		 2.50%voya_LoansPercentOfGeographicRegionToTotalLoans
/ invest_InvestmentGeographicRegionAxis
= voya_EastSouthCentralMember
Loans Receivable, Gross, Commercial, Real Estate $ 76.9us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_EastSouthCentralMember		 $ 87.1us-gaap_LoansReceivableCommercialRealEstate
/ invest_InvestmentGeographicRegionAxis
= voya_EastSouthCentralMember