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Investments in and Advances to Unconsolidated Affiliates - Fund Investments (Details) - USD ($) $ in Millions | 1 Months Ended
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Jun. 30, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Dec. 31, 2016 | Jan. 31, 2016
Cortlandt Towne Center |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Consideration received |  |  |  | $ 57.8 | $ 107.3
Proceeds from sale of equity method investments |  |  |  | 25.2 |
Gain (loss) on disposal |  |  |  | $ 36.0 | $ 65.4
Percentage of disposition |  |  |  | 35.00% | 65.00%
Cortlandt Towne Center | Mortgages |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Repayments of debt |  |  |  | $ 32.6 |
Partnership Interest | Cortlandt Towne Center |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal |  |  |  | $ 8.8 |
2819 Kennedy Boulevard | Fund IV |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Consideration received |  |  | $ 19.0 |  |
Proceeds from sale of equity method investments |  |  | 10.6 |  |
Gain (loss) on disposal |  |  | 6.3 |  |
2819 Kennedy Boulevard | Fund IV | Mortgages |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Repayments of debt |  |  | 8.4 |  |
2819 Kennedy Boulevard | Affiliated Entity | Fund IV |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal |  |  | 6.2 |  |
2819 Kennedy Boulevard | Partnership Interest | Fund IV |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal |  |  | $ 1.4 |  |
Arundel Plaza | Fund III |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Consideration received |  | $ 28.8 |  |  |
Proceeds from sale of equity method investments |  | 18.8 |  |  |
Gain (loss) on disposal |  | 8.2 |  |  |
Arundel Plaza | Fund III | Mortgages |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Repayments of debt |  | 10.0 |  |  |
Arundel Plaza | Affiliated Entity | Fund III |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal |  | 5.3 |  |  |
Arundel Plaza | Partnership Interest | Fund III |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal |  | $ 1.3 |  |  |
1701 Belmont Avenue | Fund IV |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Consideration received | $ 5.6 |  |  |  |
Proceeds from sale of equity method investments | 2.7 |  |  |  |
Gain (loss) on disposal | 3.3 |  |  |  |
1701 Belmont Avenue | Fund IV | Mortgages |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Repayments of debt | 2.9 |  |  |  |
1701 Belmont Avenue | Affiliated Entity | Fund IV |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal | 3.3 |  |  |  |
1701 Belmont Avenue | Partnership Interest | Fund IV |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal | $ 0.8 |  |  |  |

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