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Investments (Investments Pledged as Collateral) (Details)
$ in Millions
Jun. 30, 2016
USD ($)
Investments Pledged As Collateral [Line Items]  
Securities Pledged As Collateral For Reinsurance Obligations $ 11.4
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies 23.5
Securities Pledged As Collateral 128.4
U.S. Government and Government Agencies [Member]  
Investments Pledged As Collateral [Line Items]  
Securities Pledged As Collateral For Reinsurance Obligations 0.0
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies 23.5
Securities Pledged As Collateral 31.0
Obligations of States and Political Subdivisions [Member]  
Investments Pledged As Collateral [Line Items]  
Securities Pledged As Collateral For Reinsurance Obligations 5.0
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies 0.0
Securities Pledged As Collateral 5.0
Corporate Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Securities Pledged As Collateral For Reinsurance Obligations 4.8
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies 0.0
Securities Pledged As Collateral 4.8
Commercial Mortgage Backed Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Securities Pledged As Collateral For Reinsurance Obligations 0.0
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies 0.0
Securities Pledged As Collateral 1.1
Residential Mortgage Backed Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Securities Pledged As Collateral For Reinsurance Obligations 1.6
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies 0.0
Securities Pledged As Collateral 86.5
Federal Home Loan Bank of Indianapolis [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 63.6
Federal Home Loan Bank of Indianapolis [Member] | U.S. Government and Government Agencies [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 7.5
Federal Home Loan Bank of Indianapolis [Member] | Obligations of States and Political Subdivisions [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 0.0
Federal Home Loan Bank of Indianapolis [Member] | Corporate Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 0.0
Federal Home Loan Bank of Indianapolis [Member] | Commercial Mortgage Backed Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 1.1
Federal Home Loan Bank of Indianapolis [Member] | Residential Mortgage Backed Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 55.0
Federal Home Loan Bank of New York [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 29.9
Federal Home Loan Bank of New York [Member] | U.S. Government and Government Agencies [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 0.0
Federal Home Loan Bank of New York [Member] | Obligations of States and Political Subdivisions [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 0.0
Federal Home Loan Bank of New York [Member] | Corporate Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 0.0
Federal Home Loan Bank of New York [Member] | Commercial Mortgage Backed Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral 0.0
Federal Home Loan Bank of New York [Member] | Residential Mortgage Backed Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLB Collateral $ 29.9