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Equity (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 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 | Sep. 30, 2024 USD ($) item $ / shares shares | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2024 USD ($) item $ / shares shares | Sep. 30, 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 | $ 0.01 |
Number of classes of common stock | item |  |  |  |  |  | 1 |  | 1 |  |  |  |
Cash dividends declared | $ |  |  |  |  |  |  |  | $ 38.1 | $ 35.3 |  |  |
Dividends declared, per share (usd per share) | $ / shares |  |  |  |  |  | $ 0.177 | $ 0.177 | $ 0.531 | $ 0.531 |  |  |
401(K) Plan |  |  |  |  |  |  |  |  |  |  |  |
Employer gross contributions | $ |  |  |  |  |  |  |  | $ 0.5 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  | 1,054,098 |  | 1,054,098 |  |  |  |
Shares authorized for award (in shares) |  | 1,000,000 |  |  |  |  |  |  |  |  |  |
Cost not yet recognized, amount | $ |  |  |  |  |  | $ 8.6 |  | $ 8.6 |  |  |  |
Period over which costs expected to be recognized |  |  |  |  |  |  |  | 1 year 9 months 18 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 |  |  |  |  |  |  |
Trigger at average per share price (in dollars per share) | $ / shares | $ 60.00 |  |  |  |  |  |  |  |  |  |  |
Expiration term (in years) | 4 years |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  |  |  |  |  | 1,371,254 |  | 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 | $ |  |  |  |  |  | $ 3.5 |  | $ 3.5 |  |  |  |
Period over which costs expected to be recognized |  |  |  |  |  |  |  | 2 years 6 months |  |  |  |
Performance-based awards | Amended Caret Performance Incentive Plan | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days | D | 30 |  |  |  |  |  |  |  |  |  |  |
Directors |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 1 year |  |  |  |  |  |  |  |  |  |
Directors | 2009 Long Term Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  | 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 | 15,000 |  |  |  |  |  |  |  |  |  |  |
General and Administrative Expense | Caret Units | Caret Performance Incentive Plan (the "Original Caret Performance Incentive Plan"). |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense | $ |  |  |  |  |  | $ 0.3 | $ 0.5 | $ 0.6 | $ 1.0 |  |  |
Chief Executive Officer | Public Offering |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock transaction | $ |  |  | $ 1.4 |  |  |  |  |  |  |  |  |
Stock issued (in 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) |  |  |  |  |  | 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

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