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Insider Trading Arrangements - shares
 3 Months Ended
Feb. 29, 2024
Feb. 08, 2024
Jan. 24, 2024
Oct. 31, 2023
Sep. 15, 2023
Mar. 31, 2024
Trading Arrangements, by Individual            
Non-Rule 10b5-1 Arrangement Adopted           false
Non-Rule 10b5-1 Arrangement Terminated           false
Jonathan R. Bennett [Member]            
Trading Arrangements, by Individual            
Material Terms of Trading Arrangement          
On February 8, 2024, Jonathan R. Bennett, Executive Vice President and Head of Group Benefits, adopted a Rule 10b5-1 trading arrangement that is intended to satisfy the affirmative defense of Rule 10b5-1(c) for the potential sale of up to 7,688.108 shares of the Company's common stock between
May 8, 2024 and January 31, 2025 (or the date on which all shares have been sold) subject to certain conditions.
Name           Jonathan R. Bennett
Title           Executive Vice President and Head of Group Benefits
Rule 10b5-1 Arrangement Adopted           true
Adoption Date   February 8, 2024        
Arrangement Duration           268 days
Aggregate Available           7,688.108
Beth A. Costello [Member]            
Trading Arrangements, by Individual            
Material Terms of Trading Arrangement          
On February 8, 2024, Beth A. Costello, Executive Vice President and Chief Financial Officer, adopted a Rule 10b5-1 trading
arrangement that is intended to satisfy the affirmative defense of Rule 10b5-1(c) for the potential exercise of vested stock options and the associated sale of up to 72,076 shares of the Company's common stock between May 8, 2024 and May 8, 2025 (or the date on which all shares have been sold) subject to certain conditions.
Name           Beth A. Costello
Title           Executive Vice President and Chief Financial Officer
Rule 10b5-1 Arrangement Adopted           true
Adoption Date   February 8, 2024        
Arrangement Duration           365 days
Aggregate Available           72,076
Christopher J. Swift [Member]            
Trading Arrangements, by Individual            
Material Terms of Trading Arrangement          
The Rule 10b5-1 trading arrangement adopted by Christopher J. Swift, CEO and Chairman, on September 15, 2023 became fully exercised and therefore terminated on January 24, 2024.
Name           Christopher J. Swift
Title           CEO and Chairman
Rule 10b5-1 Arrangement Adopted           true
Adoption Date         September 15, 2023  
Rule 10b5-1 Arrangement Terminated           true
Termination Date     January 24, 2024      
Adin M. Tooker [Member]            
Trading Arrangements, by Individual            
Material Terms of Trading Arrangement          
The Rule 10b5-1 trading arrangement adopted by Adin M. Tooker, Executive Vice President and Head of Commercial Lines, on October 31, 2023 became fully exercised and therefore terminated on February 29, 2024.
Name           Adin M. Tooker
Title           Executive Vice President and Head of Commercial Lines
Rule 10b5-1 Arrangement Adopted           true
Adoption Date       October 31, 2023    
Rule 10b5-1 Arrangement Terminated           true
Termination Date February 29, 2024          
Tranche One [Member] | Michael R. Fisher [Member]            
Trading Arrangements, by Individual            
Arrangement Duration           259 days
Tranche Two [Member] | Michael R. Fisher [Member]            
Trading Arrangements, by Individual            
Arrangement Duration           137 days