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Debt - Additional Information (Details) - USD ($)
6 Months Ended
May 19, 2022
Jun. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Par Value   $ 1,650,000,000  
FHLB stock   11,300,000 $ 7,900,000
Long-term debt, net, book value   1,942,424,000 $ 1,696,246,000
Estimate of Fair Value Measurement | Asset Pledged as Collateral      
Debt Instrument [Line Items]      
Fair value of pledged assets   $ 638,000,000  
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  
Senior notes | 4.80% Senior Notes Due June 15, 2032      
Debt Instrument [Line Items]      
Debt, principal amount $ 400,000,000    
Interest rate 4.80%    
Par acquired by affiliates $ 150,000,000    
Total proceeds from issuance of debt to parent 395,000,000    
Federal Home Loan Bank Borrowings      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 545,000,000  
Long-term debt, net, book value   $ 0  
Senior Notes Due 2022      
Debt Instrument [Line Items]      
Interest rate   3.80%  
Debt repayment $ 300,000,000