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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 | 6 Months Ended
--- | --- | ---
Apr. 30, 2018 | Jun. 30, 2019
Fund II and Mervyns II |  |
Variable Interest Entity [Line Items] |  |
Operating Partnership Share of Capital |  | 28.33%
Capital Called |  | $ 347.1
Unfunded Commitment |  | $ 15.0
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 |  | $ 426.3
Unfunded Commitment |  | $ 23.7
Equity interest held by Operating Partnership |  | 24.54%
Preferred Return |  | 6.00%
Total Distributions |  | $ 554.8
Fund IV |  |
Variable Interest Entity [Line Items] |  |
Operating Partnership Share of Capital |  | 23.12%
Capital Called |  | $ 425.4
Unfunded Commitment |  | $ 104.6
Equity interest held by Operating Partnership |  | 23.12%
Preferred Return |  | 6.00%
Total Distributions |  | $ 147.4
Fund V |  |
Variable Interest Entity [Line Items] |  |
Operating Partnership Share of Capital |  | 20.10%
Capital Called |  | $ 118.3
Unfunded Commitment |  | $ 401.7
Equity interest held by Operating Partnership |  | 20.10%
Preferred Return |  | 6.00%
Total Distributions |  | $ 2.0
Fund II |  |
Variable Interest Entity [Line Items] |  |
Total Distributions | $ 15.0 |
Operating Partnership, as General Partner or Managing Member |  |
Variable Interest Entity [Line Items] |  |
Total Distributions | $ 4.3 |

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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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