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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 | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Jun. 30, 2020 | Jun. 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 |  | $ 362.1 |
Unfunded Commitment |  | $ 0.0 | $ 0.0
Equity interest held by Operating Partnership |  |  | 28.33%
Preferred Return |  |  | 8.00%
Total Distributions |  |  | $ 146.6
Fund III |  |  |
Variable Interest Entity [Line Items] |  |  |
Operating Partnership Share of Capital |  | 24.54% |
Capital Called |  | $ 440.3 |
Unfunded Commitment |  | $ 9.7 | $ 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 | $ 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 |  | $ 213.3 |
Unfunded Commitment |  | $ 306.7 | $ 306.7
Equity interest held by Operating Partnership |  |  | 20.10%
Preferred Return |  |  | 6.00%
Total Distributions |  |  | $ 16.7
Fund II |  |  |
Variable Interest Entity [Line Items] |  |  |
Total Distributions | $ 15.0 |  |

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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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