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Agricultural Land Sale (Details) $ in Millions		1 Months Ended	2 Months Ended	12 Months Ended
	Dec. 17, 2018 USD ($) a	Feb. 28, 2019 USD ($) a	Jan. 31, 2019	Dec. 31, 2019 USD ($) a	Dec. 31, 2018 USD ($) a	Dec. 31, 2020 USD ($)
Real Estate [Line Items]
Contingency reserves				$ 62.0		$ 62.0
Deferred revenue				$ 67.6		66.9
EMI
Real Estate [Line Items]
Ownership interest held (percent)			50.00%
Maui | EMI
Real Estate [Line Items]
Area of land sold (acres) | a					41,000
Not Discontinued Operations | Maui | Maui Diversified Agriculture
Real Estate [Line Items]
Ownership interest held (percent)	100.00%
Not Discontinued Operations | Maui | EMI
Real Estate [Line Items]
Ownership interest held (percent)		50.00%
Not Discontinued Operations | Mahi Pono Holdings, LLC | Maui
Real Estate [Line Items]
Area of land sold (acres) | a	41,000	800		41,000
Proceeds from sale	$ 261.6	$ 2.7
Contingency reserves	$ 19.5
Gross profit				$ 6.7	$ 162.2
Not Discontinued Operations | Mahi Pono Holdings, LLC | Maui | State Water Leases
Real Estate [Line Items]
Deferred revenue				$ 62.0		$ 62.0

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