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Fair Values of Financial Instruments (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) Basis_Points
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash flow modeling period	10 years
Maximum | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points	100
Fixed index annuities embedded derivative, adjustment due to change in discount rate	$ (562.4)
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate	$ (239.8)
Minimum | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points	(100)
Fixed index annuities embedded derivative, adjustment due to change in discount rate	$ 619.5
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate	$ 274.2

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Amount of change in the fair value of fixed index embedded derivative liabilities due to a change in the discount rate.

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Value of input used to measure embedded derivative liability.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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