Senior Secured Loan (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($) property land_parcel	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of properties \| property	220
Improved land parcels [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of properties \| land_parcel	19
Senior Secured Loan Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, term	2 years
Loan, stated interest rate	8.00%
Purchase price	$ 39.1
Non-cash repayment of senior secured loan	39.1
Loan outstanding, net of deferred income	15.9	$ 54.5
Loan, deferred income	0.1	0.5
Interest receivable	$ 0.3	$ 0.4
Senior Secured Loan Receivable [Member] \| Improved land parcels [Member] \| Real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of properties \| land_parcel	7
Senior Secured Loan Receivable [Member] \| Improved land parcels [Member] \| Real estate one [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of properties \| property	1
Senior Secured Loan Receivable [Member] \| Improved land parcels [Member] \| Real estate two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of properties \| property	2

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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The number of real estate properties owned as of the balance sheet date.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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