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Other Investments - Other Real Estate Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Other Real Estate Equity Investments | Minimum
Schedule of Equity Method Investments [Line Items]
Equity interest (percent)	20.00%
Other Real Estate Equity Investments | Maximum
Schedule of Equity Method Investments [Line Items]
Equity interest (percent)	95.00%
Other Real Estate Equity Investments | Operating properties
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 60.0		$ 61.7
Other Real Estate Equity Investments | Land assets
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 36.7		42.9
Other Real Estate Equity Investment Aug 2018
Schedule of Equity Method Investments [Line Items]
Equity interest (percent)	50.00%
Loans receivable, carrying value	$ 33.0		$ 33.0
Interest income	$ 0.7	$ 0.7

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