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Other Investments (Net Lease Venture II) (Details) - iStar Net Lease II LLC (Net Lease Venture II) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Equity interest	51.90%		51.90%
Other income
Schedule of Equity Method Investments [Line Items]
Management fee revenue from related party	$ 0.4	$ 0.4	$ 1.2	$ 1.1

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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