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Other Investments (Safehold Inc) (Details) - USD ($) shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Safehold Inc. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of shares owned (in shares) |  | 13.5 |  | 13.5 |
Equity interest |  | 18.90% |  | 18.90% |
Safehold Inc. | Maximum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Beneficial ownership percentage under which restrictive voting requirements no longer apply | 7.50% |  |  |  |
Percentage of ownership threshold under which registration rights will terminate. | 2.00% |  |  |  |
Safehold Management Services |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Management fees |  | $ 3.8 | $ 7.2 | $ 10.0 | $ 7.2
Safehold Management Services | Affiliated entity |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Annual management fee - Year 1 | $ 25.0 |  |  |  |
Annual management fee - Year 2 | 15.0 |  |  |  |
Annual management fee - Year 3 | 10.0 |  |  |  |
Annual management fee - Year 4 | $ 5.0 |  |  |  |
Annual management fee percent of gross book value, year five and thereafter | 2.00% |  |  |  |
Notice required to terminate management agreement with cause | 30 days |  |  |  |
Percentage approval of independent directors to terminate management agreement without cause | 66.70% |  |  |  |
Termination fee, termination without cause | $ 50.0 |  |  |  |
Termination fee due to liquidation of consolidated assets after third anniversary of agreement | 0.0 |  |  |  |
Termination fee due to reduction in consolidated assets - Year 1 | 30.0 |  |  |  |
Termination fee due to reduction in consolidated assets - Year 2 | 15.0 |  |  |  |
Termination fee due to reduction in consolidated assets - Year 3 | $ 5.0 |  |  |  |
Safehold Management Services | Affiliated entity | Minimum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Notice required to terminate management agreement without cause | 180 days |  |  |  |

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