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Equity (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
D
$ / shares
shares
Aug. 31, 2023
USD ($)
shares
Jun. 30, 2023
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
class
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Apr. 30, 2023
USD ($)
$ / 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    
Number of classes of common stock | class         1          
Cash dividends declared | $         $ 48.0 $ 43.6 $ 37.0      
Dividends declared, per share (usd per share) | $ / shares         $ 0.708 $ 0.701 $ 0.67224      
Award vesting period       4 years            
401(K) Plan                    
Employer gross contributions | $         $ 0.2          
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                
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         433,481          
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 $ 60.00                  
Expiration term (in years) 4 years                  
Awards outstanding (in shares) | shares         1,496,982          
Awards granted during the period | shares 76,801                  
Number of awards outstanding of then-outstanding units (as percentage)         15.40%          
Number of awards outstanding of then-authorized units (as percentage)         12.50%          
Cost not yet recognized, amount | $         $ 6.5          
Period over which costs expected to be recognized         3 years 3 months          
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 | $         $ 1.5 $ 0.4 $ 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                
iStar Inc. | MSD Partners                    
Class of Stock [Line Items]                    
Number of shares sold | shares 5,405,406                  
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) | 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