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Investments in and Advances to Joint Ventures - Summary of Preferred investments (Detail) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) ShoppingCenter | Dec. 31, 2018 USD ($) | Dec. 31, 2015 USD ($) ShoppingCenter | Oct. 31, 2014 USD ($) ShoppingCenter
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Preferred Investment, Valuation Allowance | $ (84.5) | $ (72.4) |  |
BRE DDR Retail Holdings Joint Venture Acquisitions [Member] | BRE DDR III [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Unconsolidated Joint Venture Partner Formation Date Month And Year | 2014 |  |  |
Preferred Investment (Principal) | $ 178.9 |  |  | $ 300.0
Preferred Investment, Valuation Allowance | (73.2) |  |  |
Preferred Investment, Net of Reserve | $ 105.7 |  |  |
Properties Owned | ShoppingCenter | 14 |  |  | 70
BRE DDR Retail Holdings Joint Venture Acquisitions [Member] | BRE DDR IV [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Unconsolidated Joint Venture Partner Formation Date Month And Year | 2015 |  |  |
Preferred Investment (Principal) | $ 64.1 |  | $ 82.6 |
Preferred Investment, Valuation Allowance | (11.3) |  |  |
Preferred Investment, Net of Reserve | $ 52.8 |  |  |
Properties Owned | ShoppingCenter | 5 |  | 6 |
BRE DDR Retail Holdings Joint Venture Acquisitions [Member] | BRE DDR III and IV [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Preferred Investment (Principal) | $ 243.0 |  | $ 382.6 |
Preferred Investment, Valuation Allowance | (84.5) |  |  |
Preferred Investment, Net of Reserve | $ 158.5 |  |  |

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