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Significant Accounting Policies (Narrative) (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) states | Dec. 31, 2017 USD ($) | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |  |  |
Number of states in which entity is licensed to sell insurance products | states |  |  | 50 |  |
Number of days past due, non-accrual status |  |  | 90 days |  |
Statutory federal income tax rate | 21.00% |  | 21.00% | 35.00% | 35.00%
Minimum |  |  |  |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products |  |  | 1.00% | 1.00% | 1.00%
Maximum |  |  |  |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products |  |  | 3.30% | 3.30% | 3.30%
Maximum | Cash and Cash Equivalents |  |  |  |  |
Investment maturity period (less than) |  |  | 3 months |  |
Accounting Standards Update 2016-09 |  |  |  |  |
New accounting pronouncement, effect of adoption, quantification |  |  | $ 2.8 | $ 2.7 |
Accounting Standards Update 2018-02 |  |  |  |  |
New accounting pronouncement, effect of adoption, quantification |  |  | $ 128.0 | $ 128.0 |
Forecast | Accounting Standards Update 2016-02 |  |  |  |  |
New accounting pronouncement, effect of adoption, quantification |  | $ 3.7 |  |  |

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