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Equity (Narrative) (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2023
D
$ / shares
shares
Aug. 31, 2023
USD ($)
shares
Jun. 30, 2023
$ / shares
shares
Mar. 31, 2023
Sep. 30, 2023
item
$ / shares
shares
Sep. 30, 2022
$ / shares
Sep. 30, 2023
item
$ / shares
shares
Sep. 30, 2023
USD ($)
item
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
Dec. 31, 2023
shares
Apr. 30, 2023
USD ($)
$ / shares
Dec. 31, 2022
$ / shares
Aug. 10, 2022
$ / shares
Sep. 30, 2018
shares
Class of Stock [Line Items]                            
Common stock, par value (in dollars per share) | $ / shares         $ 0.01   $ 0.01 $ 0.01     $ 0.01 $ 0.01    
Number of classes of common stock | item         1   1 1            
Cash dividends declared | $               $ 35.3 $ 32.5          
Dividends declared, per share (usd per share) | $ / shares         $ 0.177 $ 0.177   $ 0.531 $ 0.524          
Award vesting period       4 years                    
Public Offering and Private Placement                            
Class of Stock [Line Items]                            
Offering costs | $   $ 6.6                        
Public Offering                            
Class of Stock [Line Items]                            
Proceeds from stock transaction | $   $ 139.1                        
Stock issued (in shares)   6,500,000                        
Primary sales agreement                            
Class of Stock [Line Items]                            
Number of shares sold             0              
MSD Partners | Private Placement                            
Class of Stock [Line Items]                            
Proceeds from private placement offering | $   $ 12.8                        
Stock issued (in shares)   599,983                        
Maximum | Primary sales agreement                            
Class of Stock [Line Items]                            
Aggregate sales price | $                     $ 300.0      
2009 Long Term Incentive Plan                            
Class of Stock [Line Items]                            
Vested shares of common stock issued     24,336                      
Grant date fair value of shares issued | $ / shares     $ 23.58                      
Number of shares available for issuance for future awards (in shares)         435,612   435,612 435,612            
Performance-based awards | Caret Performance Incentive Plan (the "Original Caret Performance Incentive Plan").                            
Class of Stock [Line Items]                            
Previously vested shares subject to additional vesting (as percentage) 25.00%                          
Awards expected to vest within the next year.                   850        
Performance-based awards | Amended Caret Performance Incentive Plan                            
Class of Stock [Line Items]                            
Trigger at average per share price (in dollars per share) | $ / shares $ 60.00                          
Expiration term (in years) 4 years                          
Awards outstanding (in shares)         1,499,382   1,499,382 1,499,382            
Awards granted during the period 76,801                          
Number of awards outstanding then outstanding units (as percentage)               15.41%            
Number of awards outstanding then authorized units (as percentage)               12.50%            
Performance-based awards | Amended Caret Performance Incentive Plan | Minimum                            
Class of Stock [Line Items]                            
Threshold consecutive trading days | D 30                          
Chief Financial Officer | Performance-based awards | Amended Caret Performance Incentive Plan                            
Class of Stock [Line Items]                            
Awards granted during the period 15,000                          
General and Administrative Expense | Performance-based awards | Caret Performance Incentive Plan (the "Original Caret Performance Incentive Plan").                            
Class of Stock [Line Items]                            
Share-based payment arrangement, expense | $               $ 1.0 $ 0.4          
Chief Executive Officer | Public Offering                            
Class of Stock [Line Items]                            
Proceeds from stock transaction | $   $ 1.4                        
Stock issued (in shares)   65,420                        
iStar Inc. | MSD Partners                            
Class of Stock [Line Items]                            
Sale of stock, share price (in dollars per share) | $ / shares                         $ 37.00  
Safehold, Inc. (Old SAFE) | 2017 Equity Incentive Plan                            
Class of Stock [Line Items]                            
Number of shares available for issuance for future awards (in shares)         0   0 0            
Safehold, Inc. (Old SAFE) | Performance-based awards | Caret Performance Incentive Plan (the "Original Caret Performance Incentive Plan").                            
Class of Stock [Line Items]                            
Capital shares reserved for future issuance (in shares)                           1,500,000