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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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