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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 01, 2024
Jan. 01, 2023
Jan. 01, 2022
Jan. 01, 2021
Feb. 28, 2025
May 31, 2024
Feb. 29, 2024
May 31, 2023
Feb. 28, 2023
Jan. 31, 2023
May 31, 2022
Feb. 28, 2022
Jan. 31, 2022
May 31, 2021
Feb. 28, 2021
Jan. 31, 2021
Feb. 29, 2020
Jan. 31, 2020
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2014
Stock-based compensation                                                  
Shares tendered by employees to pay employee withholding taxes (in shares)                                           163,812 119,334 133,011  
Performance-based share awards                                                  
Stock-based compensation                                                  
Vesting period                                           3 years 3 years 3 years  
Nonvested Share Units                                                  
Stock-based compensation                                                  
Granted (in shares)                                           307,000 548,000 151,000  
Nonvested shares, share units or DEU                                                  
Stock-based compensation                                                  
Total fair value of shares vested                                           $ 25.4 $ 15.3 $ 18.4  
Nonvested shares or share units outstanding                                                  
Stock-based compensation                                                  
Total unrecognized compensation expense                                           $ 26.1      
Expected weighted average period for recognition of expense                                           2 years 4 months 24 days      
Certain Senior Management | Performance-based share awards                                                  
Stock-based compensation                                                  
Incremental cost                                           $ 4.0      
Vesting Based On Service | Nonvested Shares                                                  
Stock-based compensation                                                  
Granted (in shares)                                           53,000 75,000 87,000  
Vesting Based On Service | Employee | Nonvested Share Units | Incentive Program Bonus Award Fiscal Year Performance                                                  
Stock-based compensation                                                  
Vesting period             3 years   3 years 3 years   3 years     3 years   3 years 3 years 3 years            
Vesting Based On Service | Employee | Nonvested Share Units | Incentive Program Bonus Award Fiscal Year Performance | First Vesting Date                                                  
Stock-based compensation                                                  
Vesting percentage                         33.33%     33.33%                  
Vesting Based On Service | Employee | Nonvested Share Units | Incentive Program Bonus Award Fiscal Year Performance | Second Vesting Date                                                  
Stock-based compensation                                                  
Vesting percentage                         33.33%     33.33%                  
Vesting Based On Service | Employee | Nonvested Share Units | Incentive Program Bonus Award Fiscal Year Performance | Third Vesting Date                                                  
Stock-based compensation                                                  
Vesting percentage                         33.33%     33.33%                  
Vesting Based On Service | Director | Nonvested Share Units | Maximum                                                  
Stock-based compensation                                                  
Vesting period           1 year   1 year     1 year     1 year                      
Vesting Based On Service | Certain Employees | Nonvested Share Units | Subsequent Event                                                  
Stock-based compensation                                                  
Granted (in shares)         61,404                                        
Vesting Based On Performance | Employee | Nonvested Share Units | Incentive Program Bonus Award Fiscal Year Performance                                                  
Stock-based compensation                                                  
Vesting period             2 years                                    
Compounded Annual Book Value Per Share Growth | Nonvested Shares | Performance Based Grants 2018, 2019 and 2020                                                  
Stock-based compensation                                                  
Vesting percentage                                           100.00%      
Vesting Based On Service And Performance | Nonvested Shares                                                  
Stock-based compensation                                                  
Granted (in shares)                                           244,000 300,000 308,000  
Vesting Based On Service And Performance | Certain Senior Management | Nonvested Shares | Subsequent Event                                                  
Stock-based compensation                                                  
Granted (in shares)         289,033                                        
Vesting Based On Service And Performance | Certain Senior Management | Nonvested Share Units | Subsequent Event                                                  
Stock-based compensation                                                  
Granted (in shares)         79,192                                        
2013 Plan                                                  
Stock-based compensation                                                  
Shares authorized (in shares)                                                 7,500,000
Number of share available for future grant (in shares)                                           3,300,000      
2013 Plan | Vesting Based On Service | Certain Senior Management | Nonvested Shares                                                  
Stock-based compensation                                                  
Performance period             3 years   3 years     3 years     3 years   3 years   3 years 3 years 3 years        
2013 Plan | Vesting Based On Service | Certain Senior Management | Nonvested Shares | First Vesting Date                                                  
Stock-based compensation                                                  
Vesting percentage                 33.33%   33.33% 33.33%     33.33%                    
2013 Plan | Vesting Based On Service | Certain Senior Management | Nonvested Shares | Second Vesting Date                                                  
Stock-based compensation                                                  
Vesting percentage                 33.33%   33.33% 33.33%     33.33%                    
2013 Plan | Vesting Based On Service | Certain Senior Management | Nonvested Shares | Third Vesting Date                                                  
Stock-based compensation                                                  
Vesting percentage                 33.33%   33.33% 33.33%     33.33%                    
2013 Plan | Vesting Based On Performance | Certain Senior Management | Nonvested Shares                                                  
Stock-based compensation                                                  
Performance period 3 years 3 years 3 years 3 years                         3 years   3 years 3 years 3 years        
2013 Plan | Vesting Based On Performance | Certain Senior Management | Nonvested Shares | Maximum                                                  
Stock-based compensation                                                  
Vesting percent                                           200.00%