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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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