v3.26.3
Equity - Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
May 13, 2026
Mar. 11, 2026
Mar. 03, 2025
Aug. 29, 2024
Mar. 06, 2024
Mar. 01, 2023
Mar. 18, 2022
Mar. 11, 2022
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2021
Restricted stock                                
Stock-based incentive plan awards                                
Compensation expense, net of capitalization                           $ 20.8 $ 19.5  
Restricted stock | Non-employee Director                                
Stock-based incentive plan awards                                
Vesting service period (in years)                           1 year    
Restricted stock | Employees and non-employee Directors                                
Stock-based incentive plan awards                                
Weighted average fair value of shares granted during the year (in dollars per share)                           $ 188.54    
Vesting service period (in years)                           3 years    
Shares of restricted stock awarded during the year, net of forfeitures                           111,354    
2019 Stock Incentive Plan | Time Based Restricted Stock Units                                
Stock-based incentive plan awards                                
Grant date fair value   $ 8.2 $ 7.5   $ 8.2 $ 7.9             $ 6.9     $ 4.3
Awards granted (in units) 3,117 40,099 39,949   53,679 64,852 52,673 52,673               37,976
Weighted average fair value of shares granted during the year (in dollars per share) $ 200.56 $ 189.56 $ 187.78   $ 152.32 $ 121.25 $ 130.84 $ 130.05               $ 112.92
Vesting service period (in years)   3 years 3 years   3 years 3 years             3 years     3 years
LTIP programs                                
Stock-based incentive plan awards                                
Percent of distributions of Operating Partnership that participants are entitled to receive during performance period (in %)                           10.00%    
Compensation expense, net of capitalization                           $ 73.8 $ 39.0  
2021 LTIP program | LTIP Units                                
Stock-based incentive plan awards                                
Performance period (in years)                               3 years
Grant date fair value                           $ 5.7    
LTIP Units Earned                           209,784    
Grant date target value                           $ 12.2    
2021 LTIP program | LTIP Units | Maximum                                
Stock-based incentive plan awards                                
Grant date fair value                               $ 18.4
2022 LTIP program | LTIP Units                                
Stock-based incentive plan awards                                
Performance period (in years)                         3 years      
LTIP Units Earned                           107,462    
Grant date target value                           $ 13.7    
2022 LTIP program | LTIP Units | Maximum                                
Stock-based incentive plan awards                                
Grant date fair value                         $ 20.6      
2023 LTIP program | LTIP Units                                
Stock-based incentive plan awards                                
Performance period (in years)                       3 years        
LTIP Units Earned                           380,344    
Grant date target value                           $ 23.6    
2023 LTIP program | LTIP Units | Maximum                                
Stock-based incentive plan awards                                
Grant date fair value                       $ 42.5        
2024 LTIP program | LTIP Units                                
Stock-based incentive plan awards                                
Performance period (in years)                     3 years          
Grant date target value                           24.5    
2024 LTIP program | LTIP Units | Maximum                                
Stock-based incentive plan awards                                
Grant date fair value                     $ 44.1          
2025 LTIP program | LTIP Units                                
Stock-based incentive plan awards                                
Performance period (in years)                   3 years            
Grant date target value                           30.0    
2025 LTIP program | LTIP Units | Maximum                                
Stock-based incentive plan awards                                
Grant date fair value                   $ 48.0            
2026 LTIP Awards | LTIP Units                                
Stock-based incentive plan awards                                
Performance period (in years)                 3 years              
Grant date target value                           $ 32.9    
2026 LTIP Awards | LTIP Units | Maximum                                
Stock-based incentive plan awards                                
Grant date fair value                 $ 52.6              
2024 OPI LTIP Awards | LTIP Units                                
Stock-based incentive plan awards                                
Grant date fair value       $ 67.4                        
Awards granted (in units)       406,976                        
Weighted average fair value of shares granted during the year (in dollars per share)       $ 165.5                        
Vesting service period (in years)       5 years                        
LTIP Units Earned                           406,976    
Grant date target value                           $ 67.4    
2024 OPI LTIP Awards | Restricted stock                                
Stock-based incentive plan awards                                
Grant date fair value       $ 29.6                        
Awards granted (in units)       178,931                        
Weighted average fair value of shares granted during the year (in dollars per share)       $ 165.5                        
Vesting service period (in years)       4 years