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Business and Organization - Merger Transactions (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) director shares | Aug. 10, 2022 USD ($) $ / shares shares | Feb. 28, 2022 USD ($) shares | Mar. 31, 2023 USD ($) shares | Mar. 31, 2024 USD ($)
Merger |  |  |  |  |
Number of directors from Old SAFE entity on new post-merger board | director | 3 |  |  |  |
Number of directors from iStar entity on new post-merger board | director | 2 |  |  |  |
Number of management members from both Old SAFE and iStar entities on new post-merger board | director | 2 |  |  |  |
Caret Units |  |  |  |  |
Merger |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares |  |  | 28,571 |  |
Expected proceeds from sale of shares under purchase commitment related to merger |  |  | $ 5.0 |  |
MSD Partners | Caret Units |  |  |  |  |
Merger |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares |  | 100,000 |  |  |
Expected proceeds from sale of shares under purchase commitment related to merger |  | $ 20.0 |  |  |
Purchase price adjustment credit on the sale of shares | $ 0.6 |  |  |  |
Star Holdings |  |  |  |  |
Merger |  |  |  |  |
Stated interest on term loan | 8.00% |  |  | 8.00% |
Term on loan | 4 years |  |  |  |
Principal amount of term loan | $ 115.0 |  |  | $ 115.0 |
Star Holdings |  |  |  |  |
Merger |  |  |  |  |
Cash received in spin off transaction | $ 50.0 |  |  | $ 50.0 |
Shares in Old SAFE received in spin off transaction | shares | 13,500,000 |  |  | 13,500,000 |
Star Holdings | Morgan Stanley Bank |  |  |  |  |
Merger |  |  |  |  |
Bank debt | $ 140.0 |  |  | $ 140.0 |
Number of SAFE shares pledged as security on bank debt | shares | 13,500,000 |  |  | 13,500,000 |
Star Holdings | SOFR | Morgan Stanley Bank |  |  |  |  |
Merger |  |  |  |  |
Basis point spread on variable interest rate (percent) | 3.00% |  |  |  |
Star Holdings | Spinco Manager | Affiliated entity |  |  |  |  |
Merger |  |  |  |  |
Annual management fee paid in Year 1 |  |  |  |  | $ 25.0
Annual management fee - Year 2 | $ 15.0 |  |  | $ 15.0 |
Annual management fee - Year 3 | 10.0 |  |  | 10.0 |
Annual management fee - Year 4 | $ 5.0 |  |  | $ 5.0 |
Annual management fee percent of gross book value, year five and thereafter | 2.00% |  |  | 2.00% |
iStar Inc. | MSD Partners |  |  |  |  |
Merger |  |  |  |  |
Number of shares to be sold under purchase commitment related to merger | shares |  | 5,405,406 |  | 5,405,406 |
Expected proceeds from sale of shares under purchase commitment related to merger |  | $ 200.0 |  |  |
Sale of stock, share price (in dollars per share) | $ / shares |  | $ 37.00 |  |  |

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