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Operating Leases - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) lease	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Rental income	$ 76.8	$ 60.9
Weighted average remaining lease term	80 years 8 months 12 days
Operating lease costs	$ 0.9	0.6
Cash paid for operating lease liabilities	$ 0.4	$ 0.3
Chicago Illinois Office
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	6 years
Arizona
Lessee, Lease, Description [Line Items]
Number of parcels of land | lease	3

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Number of separate real estate development properties located on land subject to ground leases.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Publisher FASB
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- Definition

Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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