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Share-Based Payments (Summary of the Company's Employee Restricted Stock Shares, Restricted Stock Units and Performance Shares (Details) - $ / shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of shares to be awarded at the end of each performance period 0.00%    
Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of shares to be awarded at the end of each performance period 150.00%    
Employee restricted stock units      
Restricted Awards      
Restricted (in shares) 4,991,040    
Granted (in shares) 2,192,898    
Forfeited (in shares) (176,745)    
Performance adjustment (in shares) 0    
Released (in shares) (2,949,003)    
Restricted (in shares) 4,058,190 4,991,040  
Weighted Average Grant Date Fair Value      
Restricted (in dollars per share) $ 99.48    
Granted (in dollars per share) 102.64 $ 119.71 $ 81.82
Forfeited (in dollars per share) 103.88    
Performance adjustment (in dollars per share) 0.00    
Released (in dollars per share) 96.05    
Restricted (in dollars per share) $ 103.48 $ 99.48  
Employee performance shares and performance units      
Restricted Awards      
Restricted (in shares) 2,061,174    
Granted (in shares) 749,174    
Forfeited (in shares) (33,358)    
Performance adjustment (in shares) (64,007)    
Released (in shares) (610,290)    
Restricted (in shares) 2,102,693 2,061,174  
Weighted Average Grant Date Fair Value      
Restricted (in dollars per share) $ 97.44    
Granted (in dollars per share) 103.27 $ 121.29 81.43
Forfeited (in dollars per share) 104.22    
Performance adjustment (in dollars per share) 95.81    
Released (in dollars per share) 95.81    
Restricted (in dollars per share) $ 99.93 $ 97.44  
Assurance IQ | Employee restricted stock units      
Restricted Awards      
Restricted (in shares) 19,036    
Granted (in shares) 0    
Forfeited (in shares) (2,713)    
Released (in shares) (12,222)    
Restricted (in shares) 4,101 19,036  
Weighted Average Grant Date Fair Value      
Restricted (in dollars per share) $ 87.67    
Granted (in dollars per share) 0.00 $ 0 $ 0
Forfeited (in dollars per share) 87.67    
Released (in dollars per share) 87.67    
Restricted (in dollars per share) $ 87.67 $ 87.67