Basis of Presentation (Details) - property |
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| Basis of Presentation | |||
| Total number of joint venture properties | 88 | ||
| Number of joint venture properties managed by the entity | 50 | ||
| Number of International joint venture properties | 29 | ||
| Number of joint venture properties managed by others | 38 | ||
| Simon Property Group, L.P | |||
| Ownership interest: | |||
| Ownership interest in the Operating Partnership (as a percent) | 85.30% | 85.40% | |
| Simon Property Group, L.P | Weighted average | |||
| Ownership interest: | |||
| Ownership interest in the Operating Partnership (as a percent) | 85.30% | 86.60% | |
| Wholly owned properties | |||
| Basis of Presentation | |||
| Number of properties | 144 | ||
| Partially owned properties | |||
| Basis of Presentation | |||
| Number of properties | 22 | ||