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Significant Accounting Policies (Narrative) (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2020 USD ($) | Dec. 31, 2020 USD ($) states | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Number of states in which entity is licensed to sell insurance products | states |  | 50 |  |
Fair value of loaned securities |  | $ 0.1 | $ 477.5 |
Minimum |  |  |  |
Number of days past due, non-accrual status |  | 90 days |  |
Securities loaned, cash collateral posted by borrowers as a percent of the market value of loaned securities |  | 102.00% |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products |  | 1.45% | 1.45% | 1.45%
Minimum | Other Investments |  |  |  |
Investment maturity period |  | 3 months |  |
Maximum |  |  |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products |  | 2.60% | 2.60% | 2.60%
Maximum | Other Investments |  |  |  |
Investment maturity period |  | 12 months |  |
Maximum | Cash and Cash Equivalents |  |  |  |
Investment maturity period |  | 3 months |  |
Accounting Standards Update 2016-02 |  |  |  |
New accounting pronouncement, effect of adoption, quantification |  |  | $ 6.0 |
Accounting Standards Update 2018-02 |  |  |  |
New accounting pronouncement, effect of adoption, quantification |  |  |  | $ 128.0
Cash and Cash Equivalents |  |  |  |
Securities loaned, fair value of collateral |  | $ 0.1 | 495.1 |
Other Liabilities |  |  |  |
Securities loaned, fair value of collateral |  | $ 0.1 | $ 495.1 |
Mortgage Loans, Allowance for Credit Losses | Accounting Standards Update 2016-13 |  |  |  |
New accounting pronouncement, effect of adoption, quantification | $ 8.6 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | Accounting Standards Update 2016-13 |  |  |  |
New accounting pronouncement, effect of adoption, quantification | 3.2 |  |  |
Retained Earnings | Accounting Standards Update 2016-13 |  |  |  |
New accounting pronouncement, effect of adoption, quantification | $ (9.3) |  |  |

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