XML 30 R104.htm IDEA: XBRL DOCUMENT v2.4.1.9
Investments (Commercial Mortgage Loan Portfolio By Property Type By Geographic Region Within The U.S. And By U.S. State) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net $ 5,321.1us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet $ 5,405.1us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Commercial mortgage loans, Percentage 100.00%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans 100.00%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
California [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 1,434.2us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_CaliforniaMember		 1,455.5us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_CaliforniaMember
Commercial mortgage loans, Percentage 27.00%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_CaliforniaMember		 26.90%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_CaliforniaMember
Texas [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 623.4us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_TexasMember		 618.8us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_TexasMember
Commercial mortgage loans, Percentage 11.70%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_TexasMember		 11.50%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_TexasMember
Florida [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 309.4us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_FloridaMember		 331.6us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_FloridaMember
Commercial mortgage loans, Percentage 5.80%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_FloridaMember		 6.10%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_FloridaMember
Georgia [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 306.6us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_GeorgiaMember		 310.7us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_GeorgiaMember
Commercial mortgage loans, Percentage 5.80%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_GeorgiaMember		 5.80%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_GeorgiaMember
Other States [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 2,647.5us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_OtherStatesMember		 2,688.5us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ sfg_InvestmentDomesticStatesAxis
= sfg_OtherStatesMember
Commercial mortgage loans, Percentage 49.70%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_OtherStatesMember		 49.70%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ sfg_InvestmentDomesticStatesAxis
= sfg_OtherStatesMember
Pacific [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 1,914.6us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_PacificMember		 [1] 1,910.1us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_PacificMember		 [1]
Commercial mortgage loans, Percentage 36.00%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_PacificMember		 [1] 35.30%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_PacificMember		 [1]
South Atlantic [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 1,065.5us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_SouthAtlanticMember		 [1] 1,090.0us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_SouthAtlanticMember		 [1]
Commercial mortgage loans, Percentage 20.00%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_SouthAtlanticMember		 [1] 20.20%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_SouthAtlanticMember		 [1]
West South Central [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 676.9us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_WestSouthCentralMember		 [1] 672.8us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_WestSouthCentralMember		 [1]
Commercial mortgage loans, Percentage 12.70%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_WestSouthCentralMember		 [1] 12.40%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_WestSouthCentralMember		 [1]
Mountain [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 606.5us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_MountainMember		 [1] 611.4us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_MountainMember		 [1]
Commercial mortgage loans, Percentage 11.40%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_MountainMember		 [1] 11.30%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_MountainMember		 [1]
East North Central [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 466.0us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_EastNorthCentralMember		 [1] 473.8us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_EastNorthCentralMember		 [1]
Commercial mortgage loans, Percentage 8.80%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_EastNorthCentralMember		 [1] 8.80%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_EastNorthCentralMember		 [1]
Middle Atlantic [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 215.3us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_MiddleAtlanticMember		 [1] 223.0us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_MiddleAtlanticMember		 [1]
Commercial mortgage loans, Percentage 4.00%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_MiddleAtlanticMember		 [1] 4.10%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_MiddleAtlanticMember		 [1]
West North Central [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 140.1us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_WestNorthCentralMember		 [1] 186.9us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_WestNorthCentralMember		 [1]
Commercial mortgage loans, Percentage 2.60%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_WestNorthCentralMember		 [1] 3.50%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_WestNorthCentralMember		 [1]
East South Central [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 188.7us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_EastSouthCentralMember		 166.6us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_EastSouthCentralMember		 [1]
Commercial mortgage loans, Percentage 3.60%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_EastSouthCentralMember		 [1] 3.10%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_EastSouthCentralMember		 [1]
New England [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 47.5us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_NewEnglandMember		 [1] 70.5us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ invest_InvestmentGeographicRegionAxis
= sfg_NewEnglandMember		 [1]
Commercial mortgage loans, Percentage 0.90%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_NewEnglandMember		 [1] 1.30%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ invest_InvestmentGeographicRegionAxis
= sfg_NewEnglandMember		 [1]
Retail [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 2,627.1us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_RetailMember		 2,629.2us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_RetailMember
Commercial mortgage loans, Percentage 49.40%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_RetailMember		 48.60%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_RetailMember
Office [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 1,013.4us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_OfficeMember		 982.4us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_OfficeMember
Commercial mortgage loans, Percentage 19.10%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_OfficeMember		 18.20%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_OfficeMember
Industrial [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 1,001.5us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_IndustrialMember		 1,008.7us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_IndustrialMember
Commercial mortgage loans, Percentage 18.80%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_IndustrialMember		 18.70%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_IndustrialMember
Hotels And Motels [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 165.7us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_HotelsAndMotelsMember		 276.3us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_HotelsAndMotelsMember
Commercial mortgage loans, Percentage 3.10%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_HotelsAndMotelsMember		 5.10%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_HotelsAndMotelsMember
Commercial [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net 213.6us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_CommercialMember		 218.6us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_CommercialMember
Commercial mortgage loans, Percentage 4.00%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_CommercialMember		 4.00%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_CommercialMember
Apartment And Other [Member]    
Commercial Mortgage Loans [Line Items]    
Commercial mortgage loans, net $ 299.8us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_ApartmentAndOtherMember		 $ 289.9us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_ApartmentAndOtherMember
Commercial mortgage loans, Percentage 5.60%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_ApartmentAndOtherMember		 5.40%sfg_MortgageLoansOnRealEstateCommercialAndConsumerAsPercentageOfTotalCommercialMortgageLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sfg_ApartmentAndOtherMember
[1]

Geographic regions obtained from the American Council of Life Insurers Mortgage Loan Portfolio Profile.