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Investments (Investments Pledged as Collateral) (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Available-for-sale Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Assets Held by Insurance Regulators | $ 25.2
Securities pledged as collateral for reinsurance obligations | 371.6
U.S. Government and Government Agencies [Member] |
Debt Securities, Available-for-sale [Line Items] |
Assets Held by Insurance Regulators | 20.1
Securities pledged as collateral for reinsurance obligations | 20.1
Obligations of States and Political Subdivisions [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 0.0
Assets Held by Insurance Regulators | 5.1
Securities pledged as collateral for reinsurance obligations | 5.1
Residential Mortgage Backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Assets Held by Insurance Regulators | 0.0
Securities pledged as collateral for reinsurance obligations | 303.1
Commercial Mortgage Backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Assets Held by Insurance Regulators | 0.0
Securities pledged as collateral for reinsurance obligations | 43.3
Federal Home Loan Bank of New York [Member] | Available-for-sale Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 214.4
Federal Home Loan Bank of New York [Member] | U.S. Government and Government Agencies [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 0.0
Federal Home Loan Bank of New York [Member] | Residential Mortgage Backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 178.1
Federal Home Loan Bank of New York [Member] | Commercial Mortgage Backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 36.3
Federal Home Loan Bank of Indianapolis [Member] | Available-for-sale Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 132.0
Federal Home Loan Bank of Indianapolis [Member] | U.S. Government and Government Agencies [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 0.0
Federal Home Loan Bank of Indianapolis [Member] | Obligations of States and Political Subdivisions [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 0.0
Federal Home Loan Bank of Indianapolis [Member] | Residential Mortgage Backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 125.0
Federal Home Loan Bank of Indianapolis [Member] | Commercial Mortgage Backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | $ 7.0

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