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Fair Values of Financial Instruments (Narrative) (Details) $ in Millions | 9 Months Ended
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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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