Investments in Partially Owned Entities - Partially Owned Property Income Statement Schedule (Parenthetical) (Details) - Unconsolidated Non-VIE $ in Millions	Sep. 30, 2017 USD ($)
Legacy JV [Member]
Liquidation Value Preferred Interests	$ 37.4
PARTIALLY OWNED PROPERTIES
Joint venture ownership percentage owned by company	60.00%
Residual JV [Member]
PARTIALLY OWNED PROPERTIES
Joint venture ownership percentage owned by company	60.00%