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Investments (Investments Pledged as Collateral) (Details)
$ in Millions
Sep. 30, 2015
USD ($)
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLBI Collateral $ 64.6
Securities Pledged As Collateral For Reinsurance Obligations 11.7
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies 24.4
Securities Pledged As Collateral 100.7
Outstanding Borrowing With The Federal Home Loan Bank Of Indianapolis 60.0
U.S. Government and Government Agencies [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLBI Collateral 7.7
Securities Pledged As Collateral For Reinsurance Obligations 0.0
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies 24.4
Securities Pledged As Collateral 32.1
Obligations of States and Political Subdivisions [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLBI Collateral 0.0
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]  
Fixed Income Securities Pledged For FHLBI Collateral 0.0
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]  
Fixed Income Securities Pledged For FHLBI Collateral 1.4
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 1.4
Residential Mortgage Backed Securities [Member]  
Investments Pledged As Collateral [Line Items]  
Fixed Income Securities Pledged For FHLBI Collateral 55.5
Securities Pledged As Collateral For Reinsurance Obligations 1.9
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies 0.0
Securities Pledged As Collateral $ 57.4