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Borrowings and Financing Activities - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
May 31, 2024
Apr. 30, 2024
Jan. 31, 2024
Debt Instrument [Line Items]                
Repayments in cash     $ 977,079,000 $ 0 $ 0      
Loss on extinguishment of debt     4,275,000 0 $ 0      
Collateral     6,345,236,000 6,085,654,000        
Residential mortgage loans held for sale | Asset Pledged as Collateral                
Debt Instrument [Line Items]                
Collateral     515,000,000 31,000,000        
Total fixed-maturities available for sale | Fixed maturities AFS and trading securities                
Debt Instrument [Line Items]                
FHLB, collateral pledged     49,000,000 101,000,000        
Senior Notes                
Debt Instrument [Line Items]                
Outstanding borrowings     $ 1,065,337,000 1,417,781,000        
FHLB Advances                
Debt Instrument [Line Items]                
FHLB maturity period     90 days          
FHLB Advances | Minimum                
Debt Instrument [Line Items]                
FHLB, ratio of market value of collateral to advances     1.03          
FHLB Advances | Maximum                
Debt Instrument [Line Items]                
FHLB, ratio of market value of collateral to advances     1.14          
Mortgage Loan Financing Facilities | JP Morgan Master Repurchase Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity               $ 300,000,000
Mortgage Loan Financing Facilities | Goldman Sachs Master Repurchase Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity           $ 200,000,000    
Mortgage Loan Financing Facilities | BMO Master Repurchase Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity             $ 400,000,000  
Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, higher borrowing capacity option     $ 400,000,000          
Fair value of amount outstanding     0          
Revolving Credit Facility | Unsecured Revolving Credit Facility, Expiration Date 2026                
Debt Instrument [Line Items]                
Current borrowing capacity     $ 275,000,000          
Debt instrument maturity month and year     2026-12          
Senior Notes Due 2027 And 2029 | Senior Notes                
Debt Instrument [Line Items]                
Redemption price, percentage of principal amount     100.00%          
Stock retention percentage required in order to make capital stock transactions     80.00%          
Senior Notes due 2029 | Senior Notes                
Debt Instrument [Line Items]                
Basis spread on variable rate     0.30%          
Aggregate principal amount   $ 625,000,000            
Net proceeds received   $ 617,000,000            
Interest rate on senior notes     6.20%          
Outstanding borrowings     $ 617,876,000 0        
Debt instrument maturity date     May 15, 2029          
Senior Notes due 2025 | Senior Notes                
Debt Instrument [Line Items]                
Redemption price, percentage of principal amount   100.40%            
Interest rate on senior notes     6.625%          
Aggregate principal redemption amount   $ 525,000,000            
Repayments in cash   527,000,000            
Loss on extinguishment of debt   $ 4,000,000            
Outstanding borrowings     $ 0 522,343,000        
Senior Notes due 2024 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate on senior notes     4.50%          
Aggregate principal redemption amount $ 450,000,000              
Repayments in cash $ 460,000,000              
Outstanding borrowings     $ 0 449,037,000        
Senior Notes due 2027 | Senior Notes                
Debt Instrument [Line Items]                
Basis spread on variable rate     0.50%          
Interest rate on senior notes     4.875%          
Outstanding borrowings     $ 447,461,000 $ 446,401,000        
Debt instrument maturity date     Mar. 15, 2027