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Other Investments - Other Real Estate Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity interest (as a percent)		50.00%		50.00%
Other Real Estate Equity Investments | Minimum
Schedule of Equity Method Investments [Line Items]
Equity interest (as a percent)	31.00%		31.00%
Other Real Estate Equity Investments | Maximum
Schedule of Equity Method Investments [Line Items]
Equity interest (as a percent)	95.00%		95.00%
Other Real Estate Equity Investments | Operating Properties
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 61.3		$ 61.3		$ 61.7
Other Real Estate Equity Investments | Land Assets
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 30.4		$ 30.4		$ 42.9
Other Real Estate Equity Investment Aug 2018
Schedule of Equity Method Investments [Line Items]
Equity interest (as a percent)	50.00%		50.00%		50.00%
Loans receivable, carrying value	$ 33.0		$ 33.0		$ 33.0
Interest income	$ 0.6	$ 0.7	$ 1.8	$ 2.1

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