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Other Investments - Other Real Estate Equity Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2016
Unconsolidated entity |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Real estate transaction price | $ 34.3 |  |  |  |  |  |
Payments to acquire land and develop asset | 7.3 |  |  |  |  |  |
Assumption of loan in acquisition transaction | $ 27.0 |  |  |  |  |  |
Other Real Estate Equity Investments | Minimum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity interest (percent) |  | 16.00% |  | 16.00% |  |  |
Other Real Estate Equity Investments | Maximum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity interest (percent) |  | 95.00% |  | 95.00% |  |  |
Other Real Estate Equity Investments | Operating properties |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments |  | $ 60.3 |  | $ 60.3 |  | $ 65.6 |
Other Real Estate Equity Investments | Land assets |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments |  | $ 42.7 |  | $ 42.7 |  | 65.3 |
Other Real Estate Equity Investment Aug 2018 |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity interest (percent) |  | 50.00% |  | 50.00% |  |  |
Loans receivable, carrying value |  | $ 32.4 |  | $ 32.4 |  | 30.5 |
Interest income |  | $ 0.7 | $ 0.4 | $ 2.1 | $ 0.4 |  |
Other Real Estate Equity Investment Dec 2016 |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity interest (percent) |  | 50.00% |  | 50.00% |  |  | 50.00%
Interest income |  |  | $ 0.5 | $ 0.6 | $ 1.5 |  |
Amount of loan funded |  |  |  |  |  | $ 27.0 |

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