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Other Investments (Net Lease Venture II) (Details) - Net Lease Venture II - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |
Equity interest | 51.90% |
Other income |  |
Schedule of Equity Method Investments [Line Items] |  |
Management fee revenue from related party | $ 0.4 | $ 0.4

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