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Compensation Plans - Senior Executive Compensation Plan (Details) - USD ($)
shares in Thousands, $ in Millions
1 Months Ended
Dec. 31, 2022
Dec. 31, 2021
May 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options, outstanding (in shares)     5,065
Other shares issuable (in shares)     1,232
Potential maximum increase to common shares outstanding from outstanding awards (in shares)     20,185
Restricted stock units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value $ 13.1 $ 8.2  
Vesting period (in years) 3 years 3 years  
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value $ 13.1 $ 8.2  
Service period (in years) 3 years 3 years  
ROTE threshold level 7.50% 7.50%  
Target level of ROTE 10.00% 10.00%  
Performance Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target level of ROTE 7.50% 7.50%  
Percentage of targedt PSUs 75.00% 75.00%  
Performance Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target level of ROTE 15.00% 15.00%  
Percentage of targedt PSUs 150.00% 150.00%  
Restricted stock with future service required      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non option equity, outstanding (in shares)     1,811
RSUs with future service required      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non option equity, outstanding (in shares)     3,699
RSU with no future service required      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non option equity, outstanding (in shares)     10,189
Senior Executives | Leadership Contunity Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value   $ 25.0  
Service period (in years)   5 years  
Holding period   3 years