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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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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Other Investments, Short Term Loans, Fair Value Disclosure

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Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Value of input used to measure embedded derivative liability.

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Fair value portion of investments accounted under the equity method.

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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).

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