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Summary of Significant Accounting Policies - Schedule of Gain on Sale of Real Estate (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Dispositions to third parties |  |  |
Gross proceeds | $ 24.0 | $ 52.6 | $ 111.7
Gain on sale of real estate, net | $ 4.2 | $ 8.9 | $ 7.4

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- Definition Dispositions to third parties abstract. + References No definition available. + Details
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- Definition The cash inflow from the sale of real estate from discontinued operations. + References No definition available. + Details
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Namespace Prefix: | srg_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of difference between the carrying amount and the sales price of real estate properties sold as part of discontinued operations. + References No definition available. + Details
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