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Investments in Affiliates - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investment in various real estate joint ventures		$ 169.6	$ 167.6
Undistributed earnings of investments in affiliates		10.6	9.2
Dividends and distributions from unconsolidated affiliates		6.1	12.4	$ 51.1
Impairment of equity method investment	$ 188.6	0.0	0.0	$ 188.6
Kukui'iula
Schedule of Equity Method Investments [Line Items]
Investment in various real estate joint ventures		$ 118.7	$ 116.2
Equity method ownership percentage (in percent)		62.00%
Kukui'iula | Weighted average discount rate
Schedule of Equity Method Investments [Line Items]
Weighted average discount rate (percent)	18.00%			18.00%

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