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Senior Notes and Long-Term Debt - Long-Term Debt (Detail) - USD ($)
12 Months Ended
Nov. 02, 2022
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Redemption price, percentage   100.00%  
Total corporation subordinated debt   $ 2,066,200,000 $ 1,145,700,000
Long-Term Debt Qualifying as Risk-Based Capital   1,648,500,000 799,800,000
Corporation Subordinated Notes      
Debt Instrument [Line Items]      
Total corporation subordinated debt   $ 2,066,200,000 1,145,700,000
Corporation-Subordinated 3.95% Notes due Oct. 2025      
Debt Instrument [Line Items]      
Interest rate   3.95%  
Total corporation subordinated debt   $ 720,100,000 796,200,000
Corporation Subordinated 3.375% Notes due May 2032      
Debt Instrument [Line Items]      
Interest rate   3.375%  
Total corporation subordinated debt   $ 349,700,000 349,500,000
Debt instrument, basis spread on variable rate   1.131%  
Corporation Subordinated Notes 6.125% Due November 2032      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,000,000,000    
Interest rate 6.125% 6.125%  
Redemption price, percentage 100.00%    
Total corporation subordinated debt   $ 996,400,000 0
Subordinated Debt | Interest Rate Swaps      
Debt Instrument [Line Items]      
Increases in the carrying values of notes outstanding covered by interest-rate swap contracts   $ (29,300,000) $ 46,900,000