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Fair Values of Financial Instruments (Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) Basis_Points | Dec. 31, 2021 USD ($)
Fair Value Disclosures [Abstract] |  |
FHLB common stock | $ 18.0 |
Equity method investments, fair value | 717.9 | $ 520.1
Short-term loans, fair value | 320.0 | 320.0
COLI, fair value | $ 387.7 | $ 384.3
Measurement Input, Discount Rate | Minimum |  |
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 | $ 578.3 |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | $ 229.0 |
Measurement Input, Discount Rate | Maximum |  |
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 | $ (499.4) |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate | $ (193.5) |
Real Estate Investments | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash flow modeling period | 10 years |
Real Estate Investments | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Fair Value, Measurements, Recurring | Measurement Input, Residual Capitalization Rate | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate investments, measurement input | 4.75% |
Real Estate Investments | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Fair Value, Measurements, Recurring | Measurement Input, Residual Capitalization Rate | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate investments, measurement input | 6.50% |
Real Estate Investments | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Fair Value, Measurements, Recurring | Measurement Input, Residual Capitalization Rate | Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate investments, measurement input | 5.47% |
Real Estate Investments | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate investments, measurement input | 6.00% |
Real Estate Investments | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate investments, measurement input | 7.75% |
Real Estate Investments | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate | Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate investments, measurement input | 6.72% |

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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123599499&loc=d3e63345-112809 + Details
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