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INVESTMENTS - NARRATIVE (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
mortgage_loan
loan
state
investment
Dec. 31, 2021
USD ($)
investment
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Premium deficiencies adjustments to present value of future profits   $ (7,300,000)    
Reduction to deferred acquisition costs due to unrealized gains that would result in premium deficiency if unrealized gains were realized   (132,200,000)    
Adjustment to insurance liabilities $ 0 (25,500,000)    
Increase to deferred tax assets due to unrealized gains that would result in premium deficiency if unrealized gains were realized   35,800,000    
Debt securities, available-for-sale at amortized cost 23,384,200,000 21,867,600,000    
Amortized cost 23,384,200,000      
Estimated fair value 20,353,400,000 24,805,400,000   $ 21,293,100,000
Amortized cost of fixed maturity investments not accruing investment income 1,000,000      
Carrying value of fixed maturity investments not accruing investment income 0      
Net realized investment gains (losses) (135,400,000) 19,100,000 $ (36,200,000)  
Change in allowance for credit losses and impairments of other investments $ (52,600,000) $ 12,200,000 (18,500,000)  
Number of investments in default or considered nonperforming | investment 0 0    
Value of available for sale securities sold $ 1,651,500,000 $ 493,500,000 507,100,000  
Estimated fair value $ 6,018,800,000      
Percent of fixed maturities 29.60%      
Number of additional states greater than specified percentage of mortgage loan balance | state 0      
Assets held by insurance regulators $ 37,200,000 38,800,000    
Commercial Portfolio Segment        
Debt Securities, Available-for-sale [Line Items]        
Number of mortgage loans in foreclosure | mortgage_loan 0      
Carrying value of loans $ 1,232,200,000      
Residential Portfolio Segment | Financial Asset, Past Due        
Debt Securities, Available-for-sale [Line Items]        
Number of mortgage loans noncurrent | loan 3      
Carrying value of loans $ 600,000      
Residential Portfolio Segment | Financial Asset, Past Due | Foreclosure        
Debt Securities, Available-for-sale [Line Items]        
Number of mortgage loans noncurrent | loan 2      
Carrying value of loans $ 500,000      
Minimum        
Debt Securities, Available-for-sale [Line Items]        
Percentage of mortgage loan balance 6.00%      
California        
Debt Securities, Available-for-sale [Line Items]        
Percentage of mortgage loan balance 16.00%      
Maryland        
Debt Securities, Available-for-sale [Line Items]        
Percentage of mortgage loan balance 10.00%      
GEORGIA        
Debt Securities, Available-for-sale [Line Items]        
Percentage of mortgage loan balance 7.00%      
WISCONSIN        
Debt Securities, Available-for-sale [Line Items]        
Percentage of mortgage loan balance 7.00%      
Corporate securities        
Debt Securities, Available-for-sale [Line Items]        
Gross realized losses on sale $ 70,900,000 19,500,000 16,200,000  
Other Investments        
Debt Securities, Available-for-sale [Line Items]        
Gross realized losses on sale 9,100,000 900,000 1,800,000  
Residential Mortgage | Total amortized cost        
Debt Securities, Available-for-sale [Line Items]        
Mortgage loans 187,700,000      
Residential Mortgage | Estimated fair value        
Debt Securities, Available-for-sale [Line Items]        
Mortgage loans 190,700,000      
Non-agency residential mortgage-backed securities        
Debt Securities, Available-for-sale [Line Items]        
Gross realized losses on sale 16,500,000      
States and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Gross realized losses on sale 7,500,000      
Total fixed maturities, available for sale        
Debt Securities, Available-for-sale [Line Items]        
Gross realized losses on sale 104,000,000.0 20,400,000 53,700,000  
Fixed indexed annuities - embedded derivative        
Debt Securities, Available-for-sale [Line Items]        
Increase (decreases) in fair value of certain fixed maturity investments with embedded derivatives (45,900,000) (4,000,000) (100,000)  
Reinsurance Contract | Embedded derivative related to modified coinsurance agreement        
Debt Securities, Available-for-sale [Line Items]        
Increase (decreases) in fair value of certain fixed maturity investments with embedded derivatives (16,100,000) (3,100,000) 2,600,000  
Marketable Securities        
Debt Securities, Available-for-sale [Line Items]        
Net realized investment gains (losses) (9,600,000) 24,200,000 (15,100,000)  
Equity Securities        
Debt Securities, Available-for-sale [Line Items]        
Net realized investment gains (losses) (11,200,000) (10,200,000) (5,100,000)  
Fixed Maturities        
Debt Securities, Available-for-sale [Line Items]        
Amortized cost 23,384,200,000 21,867,600,000    
Estimated fair value $ 20,353,400,000 24,805,400,000    
Continuous unrealized loss position 20.00%      
Commercial mortgage-backed securities        
Debt Securities, Available-for-sale [Line Items]        
Gross realized losses on sale     26,100,000  
Estimated fair value $ 2,222,400,000      
Percent of fixed maturities 10.90%      
Asset-backed securities        
Debt Securities, Available-for-sale [Line Items]        
Gross realized losses on sale     $ 9,600,000  
Estimated fair value $ 1,287,000,000      
Percent of fixed maturities 6.30%      
NAIC        
Debt Securities, Available-for-sale [Line Items]        
Percentage of available-for-sale debt securities 3.30%      
Amortized cost $ 771,700,000      
Estimated fair value $ 672,800,000      
Available-for-sale securities, percentage of amortized cost 87.00%      
Below-investment Grade        
Debt Securities, Available-for-sale [Line Items]        
Debt securities, available-for-sale at amortized cost $ 1,410,400,000      
Percentage of available-for-sale debt securities 6.00%      
Estimated fair value $ 1,318,500,000      
Available-for-sale securities, percentage of amortized cost 93.00%      
Continuous unrealized loss position 20.00%      
Below-investment Grade | Fixed Maturities        
Debt Securities, Available-for-sale [Line Items]        
Amortized cost $ 1,410,400,000 1,795,000,000    
Estimated fair value 1,318,500,000 1,974,900,000    
Below-investment Grade | Commercial mortgage-backed securities        
Debt Securities, Available-for-sale [Line Items]        
Amortized cost 93,300,000 83,600,000    
Estimated fair value 75,100,000 84,700,000    
Below-investment Grade | Asset-backed securities        
Debt Securities, Available-for-sale [Line Items]        
Amortized cost 123,200,000 145,900,000    
Estimated fair value $ 103,900,000 $ 146,500,000