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Equity (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
D
$ / shares
shares
May 31, 2024
$ / shares
shares
Aug. 31, 2023
USD ($)
shares
Jun. 30, 2023
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
class
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Apr. 30, 2023
USD ($)
$ / 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  
Number of classes of common stock | class           1        
Cash dividends declared | $           $ 50.9 $ 48.0 $ 43.6    
Dividends declared, per share (usd per share) | $ / shares           $ 0.708 $ 0.708 $ 0.701    
Award vesting period           4 years        
Dividends, ordinary income amount, percent           4.795%        
Dividends, return of capital for tax reporting, percent           95.205%        
401(K) Plan                    
Employer gross contributions | $           $ 0.7        
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              
MSD Partners | Private Placement                    
Class of Stock [Line Items]                    
Proceeds from private placement offering | $     $ 12.8              
Stock issued (in shares)     599,983              
Maximum                    
401(K) Plan                    
Employer match as a percentage of participant's contributions           50.00%        
Maximum employer match as a percent of employee's compensation           10.00%        
Maximum | Primary sales agreement                    
Class of Stock [Line Items]                    
Aggregate sales price | $                 $ 300.0  
Minimum                    
401(K) Plan                    
Length of continuous service required for eligibility           3 months        
2009 Long Term Incentive Plan                    
Class of Stock [Line Items]                    
Aggregate grant date fair value of awards granted during period | $         $ 25.0 $ 8.9        
Per share grant date fair value of awards granted during period | $ / shares         $ 28.89          
Shares of common stock issued           262,635        
Number of shares available for issuance for future awards (in shares)           1,055,711        
Shares authorized for award (in shares)   1,000,000                
Awards granted during the period           441,233        
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%                  
Performance-based awards | Amended Caret Performance Incentive Plan                    
Class of Stock [Line Items]                    
Estimated grant date fair value | $ $ 8.1       $ 8.1          
Trigger at average per share price (in dollars per share) | $ / shares $ 60                  
Expiration term (in years) 4 years                  
Awards outstanding (in shares)           1,371,254        
Awards granted during the period 76,801                  
Number of awards outstanding of then-outstanding units (as percentage)           14.40%        
Number of awards outstanding of then-authorized units (as percentage)           11.40%        
Cost not yet recognized, amount | $           $ 3.1        
Period over which costs expected to be recognized           2 years 3 months        
Performance-based awards | Amended Caret Performance Incentive Plan | Minimum                    
Class of Stock [Line Items]                    
Threshold consecutive trading days | D 30                  
Directors | 2009 Long Term Incentive Plan                    
Class of Stock [Line Items]                    
Per share grant date fair value of awards granted during period | $ / shares   $ 20.78                
Shares of common stock issued   32,300   24,336            
Grant date fair value of shares issued | $ / shares       $ 23.58            
Award vesting period   1 year                
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 | $           $ 0.9 $ 1.5 $ 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]                    
Number of shares sold 5,405,406                  
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        
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