Investments in Unconsolidated Entities and International Investments - Asian Joint Ventures (Details) - Premium Outlets - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Japan \| Mitsubishi Estate Co., Ltd.
Investment in Unconsolidated Entities
Ownership percentage	40.00%	40.00%
Our net Investment in unconsolidated entities, at equity	$ 248.5	$ 221.5
South Korea \| Shinsegae International Co
Investment in Unconsolidated Entities
Ownership percentage	50.00%	50.00%
Our net Investment in unconsolidated entities, at equity	$ 206.8	$ 209.1

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

SIMON PROPERTY GROUP INC. 10-Q