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Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions		1 Months Ended
	Mar. 31, 2023 item	Mar. 31, 2023 USD ($) item $ / shares	Jan. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)
Stock-based compensation
Aggregate grant date fair value of awards granted during period		$ 25.0
Per share grant date fair value of awards granted during period | $ / shares		$ 28.89
Award vesting period		4 years
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Allowance for credit losses
Amount of allowance for credit losses on net investment in sales-type leases			$ 0.4	$ 0.4
Amount of allowance for credit losses on ground lease receivables			$ 0.2	$ 0.2
Star Holdings
Loan receivable
Term on loan	4 years
Star Holdings | Affiliated entity
Loan receivable
Term on loan	4 years
iStar Merger
Equity investments
Number of equity investments acquired | item	2	2

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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