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Investments (Investments Pledged as Collateral) (Details) $ in Millions | Mar. 31, 2020 USD ($)
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Financial Instruments Owned and Pledged as Collateral [Line Items] |
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies | $ 27.7
Securities Pledged As Collateral | 428.3
Federal Home Loan Bank of Indianapolis [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 146.8
Federal Home Loan Bank of New York [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 253.8
U.S. Government and Government Agencies [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies | 23.4
Securities Pledged As Collateral | 23.4
U.S. Government and Government Agencies [Member] | Federal Home Loan Bank of Indianapolis [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 0.0
U.S. Government and Government Agencies [Member] | Federal Home Loan Bank of New York [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 0.0
Obligations of States and Political Subdivisions [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies | 4.0
Securities Pledged As Collateral | 4.0
Obligations of States and Political Subdivisions [Member] | Federal Home Loan Bank of Indianapolis [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 0.0
Obligations of States and Political Subdivisions [Member] | Federal Home Loan Bank of New York [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 0.0
Corporate Securities [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies | 0.3
Securities Pledged As Collateral | 0.3
Corporate Securities [Member] | Federal Home Loan Bank of Indianapolis [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 0.0
Corporate Securities [Member] | Federal Home Loan Bank of New York [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 0.0
Commercial Mortgage Backed Securities [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies | 0.0
Securities Pledged As Collateral | 35.2
Commercial Mortgage Backed Securities [Member] | Federal Home Loan Bank of Indianapolis [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 7.1
Commercial Mortgage Backed Securities [Member] | Federal Home Loan Bank of New York [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 28.1
Residential Mortgage Backed Securities [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies | 0.0
Securities Pledged As Collateral | 365.4
Residential Mortgage Backed Securities [Member] | Federal Home Loan Bank of Indianapolis [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | 139.7
Residential Mortgage Backed Securities [Member] | Federal Home Loan Bank of New York [Member] |
Financial Instruments Owned and Pledged as Collateral [Line Items] |
Fixed Income Securities Pledged For FHLB Collateral | $ 225.7

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