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Equity (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Mar. 31, 2023
USD ($)
D
$ / shares
shares
Aug. 31, 2023
USD ($)
shares
Jun. 30, 2023
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
Mar. 31, 2024
USD ($)
item
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
Dec. 31, 2023
$ / 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 | item         1        
Cash dividends declared         $ 12.7 $ 11.1      
Dividends declared, per share (usd per share) | $ / shares         $ 0.177 $ 0.177      
401(K) Plan                  
Employer gross contributions         $ 0.4        
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) | shares   6,500,000              
Primary sales agreement                  
Class of Stock [Line Items]                  
Number of shares sold | shares         0        
MSD Partners | Private Placement                  
Class of Stock [Line Items]                  
Proceeds from private placement offering   $ 12.8              
Stock issued (in shares) | 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          
Per share grant date fair value of awards granted during period | $ / shares       $ 28.89          
Number of shares available for issuance for future awards (in shares) | shares         89,998        
Cost not yet recognized, amount         $ 12.5        
Period over which costs expected to be recognized         2 years 2 months 12 days        
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   $ 8.1      
Trigger at average per share price (in dollars per share) | $ / shares $ 60.00                
Expiration term (in years) 4 years                
Awards outstanding (in shares) | shares         1,395,082        
Awards granted during the period | shares 76,801                
Number of awards outstanding of then-outstanding units (as percentage)         14.50%        
Number of awards outstanding of then-authorized units (as percentage)         11.60%        
Cost not yet recognized, amount         $ 6.1        
Period over which costs expected to be recognized         3 years        
Performance-based awards | Amended Caret Performance Incentive Plan | Minimum                  
Class of Stock [Line Items]                  
Threshold consecutive trading days | D 30                
Director | 2009 Long Term Incentive Plan                  
Class of Stock [Line Items]                  
Vested shares of common stock issued | shares     24,336            
Grant date fair value of shares issued | $ / shares     $ 23.58            
Chief Financial Officer | Performance-based awards | Amended Caret Performance Incentive Plan                  
Class of Stock [Line Items]                  
Awards granted during the period | shares 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         $ 0.5        
Chief Executive Officer | Public Offering                  
Class of Stock [Line Items]                  
Proceeds from stock transaction   $ 1.4              
Stock issued (in shares) | shares   65,420              
Safehold, Inc. (Old SAFE) | 2017 Equity Incentive Plan                  
Class of Stock [Line Items]                  
Number of shares available for issuance for future awards (in shares) | 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) | shares                 1,500,000