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Significant Accounting Policies (Narrative) (Details) $ in Millions			12 Months Ended
	Jan. 01, 2020 USD ($)	Jan. 01, 2018	Dec. 31, 2019 USD ($) states	Dec. 31, 2018 USD ($)	Dec. 31, 2017
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
Fair value of loaned securities			$ 477.5
Statutory federal income tax rate		21.00%	21.00%	21.00%	35.00%
Minimum
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			1.00%	1.00%	1.00%
Minimum | Other Investments
Investment maturity period			3 months
Maximum
Interest crediting rate, range for fixed index annuities and other deferred annuity products			2.80%	2.80%	2.80%
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			495.1
Other Liabilities
Securities loaned, fair value of collateral			$ 495.1
Effect Due to Change in Allowance for Credit Loss | Retained Earnings | Forecast | Accounting Standards Update 2016-13 | Minimum
New accounting pronouncement, effect of adoption, quantification	$ 5.0
Effect Due to Change in Allowance for Credit Loss | Retained Earnings | Forecast | Accounting Standards Update 2016-13 | Maximum
New accounting pronouncement, effect of adoption, quantification	10.0
Effect Due to Recognition of Expected Lifetime Credit Losses Related to Reinsurance Recoverable/Coinsurance Deposits Balances | Retained Earnings | Forecast | Accounting Standards Update 2016-13 | Minimum
New accounting pronouncement, effect of adoption, quantification	1.0
Effect Due to Recognition of Expected Lifetime Credit Losses Related to Reinsurance Recoverable/Coinsurance Deposits Balances | Retained Earnings | Forecast | Accounting Standards Update 2016-13 | Maximum
New accounting pronouncement, effect of adoption, quantification	$ 3.0

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