Property Dispositions - Narratives (Details) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2020 USD ($)	Mar. 31, 2020 USD ($) property	Mar. 31, 2019 USD ($) property	Dec. 31, 2019 property
Properties disposed of by sale
Discontinued Operation Additional Disclosures
Number of properties sold | property		4	1
Proceeds from the sale of properties	$ 103.5	$ 105.2	$ 4.9
Gain (loss) on sale of real estate, net of tax		11.8	$ 0.9
Gain on sales of real estate, applicable tax		0.1
Properties disposed of by sale | Noncontrolling interests
Discontinued Operation Additional Disclosures
Proceeds from the sale of properties		4.7
Gain (loss) on sale of real estate, net of tax		$ 0.6
Asset held for sale, not in discontinued operations
Discontinued Operation Additional Disclosures
Number of real estate properties (property) | property				1