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Investments in Unconsolidated Joint Ventures - Narrative (Details) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) joint_venture	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Ownership percentage					20.00%
Number of joint ventures | joint_venture					3
Institutional Investor JV
Schedule of Equity Method Investments [Line Items]
Joint venture, initial term				5 years
Size of partnership				$ 312.5
Joint Venture
Schedule of Equity Method Investments [Line Items]
Maximum borrowing limit	$ 201.0
Non-recourse guarantee, term	two
Maximum exposure					$ 85.2
Joint Venture | LIBOR
Schedule of Equity Method Investments [Line Items]
Basis spread on variable rate	3.50%
Property management expenses | Joint Venture
Schedule of Equity Method Investments [Line Items]
Management fee income					$ 5.8	$ 3.6	$ 1.9
J.P. Morgan JV
Schedule of Equity Method Investments [Line Items]
Ownership percentage					20.00%
Size of partnership		$ 625.0	$ 253.1

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