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Fair Values of Financial Instruments (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Basis_Points
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Expected cost of annual call options 2.10% 2.10% 2.90% 3.10%
Experience study on products with lifetime income benefit riders, period     10 years  
Mean reversion period 8 years 8 years 20 years  
Real Estate Investments | Valuation Technique, Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash flow modeling period 10 years      
Minimum | Measurement Input, Cap Rate | Real Estate Investments | Valuation Technique, Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investments, measurement input 5.00%      
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 $ 627.3      
Deferred policy acquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate $ 274.1      
Minimum | Measurement Input, Discount Rate | Real Estate Investments | Valuation Technique, Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investments, measurement input 6.25%      
Maximum | Measurement Input, Cap Rate | Real Estate Investments | Valuation Technique, Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investments, measurement input 6.25%      
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 $ (546.8)      
Deferred policy acquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate $ (234.3)      
Maximum | Measurement Input, Discount Rate | Real Estate Investments | Valuation Technique, Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investments, measurement input 7.50%      
Average | Measurement Input, Cap Rate | Real Estate Investments | Valuation Technique, Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investments, measurement input 5.72%      
Average | Measurement Input, Discount Rate | Real Estate Investments | Valuation Technique, Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Real estate investments, measurement input 6.97%