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Other Investments - Other Real Estate Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2016
Other Real Estate Equity Investments | Minimum
Schedule of Equity Method Investments [Line Items]
Equity interest (percent)	16.00%
Other Real Estate Equity Investments | Maximum
Schedule of Equity Method Investments [Line Items]
Equity interest (percent)	95.00%
Other Real Estate Equity Investment Aug 2018
Schedule of Equity Method Investments [Line Items]
Equity interest (percent)	50.00%
Loans receivable, carrying value	$ 31.2		$ 30.5
Interest income	$ 0.7
Other Real Estate Equity Investment Dec 2016
Schedule of Equity Method Investments [Line Items]
Equity interest (percent)	50.00%
Interest income	$ 0.5	$ 0.5
Commitment to provide loan				$ 27.0
Amount of loan funded	27.0		27.0
Operating properties | Other Real Estate Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	62.4		65.6
Land assets | Other Real Estate Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 44.7		$ 65.3

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