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Debt - Additional Information (Details)
6 Months Ended
Mar. 29, 2024
USD ($)
extension_option
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Instrument [Line Items]      
Activity-based common stock ownership percentage   0.041  
FHLB stock   $ 36,400,000 $ 22,300,000
Short-term debt, face amount   663,225,000  
Estimate of Fair Value Measurement | Asset Pledged as Collateral      
Debt Instrument [Line Items]      
Fair value of pledged assets   1,400,000,000  
Federal Home Loan Bank Borrowings      
Debt Instrument [Line Items]      
Short-term debt, face amount   $ 180,000,000 0
Line of Credit      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 1,000,000,000    
Potential maximum borrowing capacity $ 1,250,000,000    
Number of extension options | extension_option 2    
Extension term 1 year    
Junior Subordinated Debentures Due 2056      
Debt Instrument [Line Items]      
Interest rate   4.25%  
Senior Notes      
Debt Instrument [Line Items]      
Optional redemption, period from issuance date   5 years  
Federal Home Loan Bank Borrowings      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 640,000,000  
Long-term line of credit   $ 303,000,000 $ 138,000,000