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Investments (Investments Pledged as Collateral) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
Assets Held by Insurance Regulators | $ 25.7
Securities pledged as collateral for reinsurance obligations | 164.9
U.S. Government and Government Agencies [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Assets Held by Insurance Regulators | 22.6
Securities pledged as collateral for reinsurance obligations | 25.6
Obligations of States and Political Subdivisions [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 0.0
Assets Held by Insurance Regulators | 3.1
Securities pledged as collateral for reinsurance obligations | 3.1
Commercial Mortgage Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Assets Held by Insurance Regulators | 0.0
Securities pledged as collateral for reinsurance obligations | 20.3
Residential Mortgage Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Assets Held by Insurance Regulators | 0.0
Securities pledged as collateral for reinsurance obligations | 115.9
Federal Home Loan Bank of New York [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 73.7
Federal Home Loan Bank of New York [Member] | U.S. Government and Government Agencies [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 0.0
Federal Home Loan Bank of New York [Member] | Commercial Mortgage Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 14.1
Federal Home Loan Bank of New York [Member] | Residential Mortgage Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 59.6
Federal Home Loan Bank of Indianapolis [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 65.5
Federal Home Loan Bank of Indianapolis [Member] | U.S. Government and Government Agencies [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 3.0
Federal Home Loan Bank of Indianapolis [Member] | Commercial Mortgage Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 6.2
Federal Home Loan Bank of Indianapolis [Member] | Residential Mortgage Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | $ 56.3

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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75027294&loc=d3e22002-158495 + Details
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