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Insider Trading Arrangements - shares
 3 Months Ended
Nov. 21, 2023
Oct. 31, 2023
Dec. 31, 2023
Trading Arrangements, by Individual      
Material Terms of Trading Arrangement    
On October 31, 2023, Adin M. Tooker, Executive Vice President, Middle & Large Commercial, Global Specialty and Sales and Distribution, 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 7,643.967 shares of the Company's common stock on February 29, 2024. This 10b5-1 plan is effective through October 31, 2024.
On November 21, 2023, Michael R. Fisher, Executive Vice President and Property and Casualty Chief Underwriting Officer, 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 (i) up to 4,088 shares of the Company's common stock between March 1, 2024 and November 15, 2024 and (ii) up to 4,088 shares of the Company's common stock between July 1, 2024 and November 15, 2024, subject to certain conditions. This 10b5-1 plan is effective through November 15, 2024.
Non-Rule 10b5-1 Arrangement Adopted     false
Rule 10b5-1 Arrangement Terminated     false
Non-Rule 10b5-1 Arrangement Terminated     false
Adin M. Tooker [Member]      
Trading Arrangements, by Individual      
Name     Adin M. Tooker
Title     Executive Vice President, Middle & Large Commercial, Global Specialty and Sales and Distribution
Rule 10b5-1 Arrangement Adopted     true
Adoption Date   October 31, 2023  
Arrangement Duration     245 days
Aggregate Available     7,643.967
Michael R. Fisher [Member]      
Trading Arrangements, by Individual      
Name     Michael R. Fisher
Title     Executive Vice President and Property and Casualty Chief Underwriting Officer
Rule 10b5-1 Arrangement Adopted     true
Adoption Date November 21, 2023    
Tranche One [Member] | Michael R. Fisher [Member]      
Trading Arrangements, by Individual      
Arrangement Duration     259 days
Aggregate Available     4,088
Tranche Two [Member] | Michael R. Fisher [Member]      
Trading Arrangements, by Individual      
Arrangement Duration     137 days
Aggregate Available     4,088