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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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