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Other Investments (Net Lease Venture II) (Details) - iStar Net Lease II LLC (Net Lease Venture II) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity interest | 51.90% |  | 51.90% |
Other income |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee revenue from related party | $ 0.4 | $ 0.4 | $ 1.2 | $ 1.1

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