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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Operating Partnership's Equity Interest (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Apr. 30, 2018 | Sep. 30, 2020
Operating Partnership, as General Partner or Managing Member |  |  |
Variable Interest Entity [Line Items] |  |  |
Total Distributions |  | $ 4.3 |
Fund II and Mervyns II |  |  |
Variable Interest Entity [Line Items] |  |  |
Operating Partnership Share of Capital |  |  | 28.33%
Capital Called |  |  | $ 369.6
Unfunded Commitment |  |  | $ 15.7
Equity interest held by Operating Partnership |  |  | 28.33%
Preferred Return |  |  | 8.00%
Total Distributions |  |  | $ 169.8
Fund III |  |  |
Variable Interest Entity [Line Items] |  |  |
Operating Partnership Share of Capital |  |  | 24.54%
Capital Called |  |  | $ 440.3
Unfunded Commitment |  |  | $ 9.7
Equity interest held by Operating Partnership |  |  | 24.54%
Preferred Return |  |  | 6.00%
Total Distributions |  |  | $ 568.8
Fund IV |  |  |
Variable Interest Entity [Line Items] |  |  |
Operating Partnership Share of Capital |  |  | 23.12%
Capital Called |  |  | $ 457.1
Unfunded Commitment |  |  | $ 72.9
Equity interest held by Operating Partnership |  |  | 23.12%
Preferred Return |  |  | 6.00%
Total Distributions |  |  | $ 193.1
Fund V |  |  |
Variable Interest Entity [Line Items] |  |  |
Operating Partnership Share of Capital |  |  | 20.10%
Capital Called |  |  | $ 217.1
Unfunded Commitment |  |  | $ 302.9
Equity interest held by Operating Partnership |  |  | 20.10%
Preferred Return |  |  | 6.00%
Total Distributions |  |  | $ 20.9
Fund II |  |  |
Variable Interest Entity [Line Items] |  |  |
Total Distributions |  | $ 15.0 |
Fund II | Mervyns II |  |  |
Variable Interest Entity [Line Items] |  |  |
Total Distributions | $ 7.5 |  |

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- Definition Limited liability company (LLC) or Limited partnership (LP), Managing member or General partner, Ownership share of capital. + References No definition available. + Details
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