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Related Party Transactions (Star Holdings) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Mar. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2023	Apr. 30, 2023
Selling stockholder sales agreement | Maximum
Related Party Transaction [Line Items]
Aggregate number of shares					1,000,000
Star Holdings | Affiliated entity
Related Party Transaction [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%
Management agreement initial term			3 years
Management fees recorded		$ 6.0		$ 13.2
Star Holdings | Safehold Inc.
Related Party Transaction [Line Items]
Ownership percentage		19.00%		19.00%
Star Holdings | Spinco Manager | Affiliated entity
Related Party Transaction [Line Items]
Annual management fee - Year 1	$ 25.0		$ 25.0
Annual management fee - Year 2	15.0		15.0
Annual management fee - Year 3	10.0		10.0
Annual management fee - Year 4	$ 5.0		$ 5.0
Annual management fee percent of gross book value, year five and thereafter	2.00%		2.00%
Management agreement initial term	1 year
Management agreement renewal term	1 year
Notice required to terminate management agreement without cause	180 days
Percentage approval of independent directors to terminate management agreement without cause	66.70%
Notice required to terminate management agreement with cause	30 days
Termination fee, termination without cause	$ 50.0		$ 50.0
Termination fee due to liquidation of consolidated assets after third anniversary of agreement	0.0		0.0
Termination fee due to reduction in consolidated assets - Year 1	30.0		30.0
Termination fee due to reduction in consolidated assets - Year 2	15.0		15.0
Termination fee due to reduction in consolidated assets - Year 3	$ 5.0		$ 5.0

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Term of management agreement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Fee due in the event the management agreement is terminated in year one based on a reduction in managed assets falling below designated thresholds.

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Fee due in the event the management agreement is terminated in year three based on a reduction in managed assets falling below designated thresholds.

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Fee due in the event the management agreement is terminated by the company without cause prior to the fourth anniversary of the agreement, net of the aggregate amount of management fees paid prior to termination.

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The percentage of gross assets, net of common stock shares owned, used for determining annual fees for managing operations for year five and thereafter per a management agreement.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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