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Investments in and Advances to Unconsolidated Affiliates - Fund Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2017 | Jan. 31, 2017 | Dec. 31, 2016 | Jan. 31, 2016 | Mar. 31, 2017
Mortgages [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Repayments of debt |  |  |  |  | $ 3.5
Fund III [Member] | Cortlandt Towne Center [Member] |  |  |  |  |
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% |
Fund III [Member] | Cortlandt Towne Center [Member] | Mortgages [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Repayments of debt |  |  | $ 32.6 |  |
Partnership Interest [Member] | Fund III [Member] | Cortlandt Towne Center [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal |  |  | $ 8.8 |  |
2819 Kennedy Boulevard [Member] | Fund IV [Member] |  |  |  |  |
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 [Member] | Fund IV [Member] | Mortgages [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Repayments of debt |  | 8.4 |  |  |
2819 Kennedy Boulevard [Member] | Affiliated Entity [Member] | Fund IV [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal |  | 6.2 |  |  |
2819 Kennedy Boulevard [Member] | Partnership Interest [Member] | Fund IV [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal |  | $ 1.4 |  |  |
Arundel Plaza [Member] | Fund III [Member] |  |  |  |  |
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 [Member] | Fund III [Member] | Mortgages [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Repayments of debt | 10.0 |  |  |  |
Arundel Plaza [Member] | Affiliated Entity [Member] | Fund III [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal | 5.3 |  |  |  |
Arundel Plaza [Member] | Partnership Interest [Member] | Fund III [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) on disposal | $ 1.3 |  |  |  |

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