Recent Transactions (Rockpoint Transaction) (Narrative) (Details) - USD ($) $ in Millions |
6 Months Ended | |||
|---|---|---|---|---|
Mar. 10, 2017 |
Feb. 27, 2017 |
Jun. 30, 2017 |
Dec. 31, 2016 |
|
| RRLP [Member] | ||||
| Preferred Units [Line Items] | ||||
| Assets | $ 1.8 | $ 1.3 | ||
| Mortgages and loans payable | 635.4 | 480.7 | ||
| Other liabilities | 79.7 | $ 40.1 | ||
| Investment Agreement [Member] | Rockpoint [Member] | ||||
| Preferred Units [Line Items] | ||||
| Incremental closing payments, Limited Partnership interest | $ 150.0 | |||
| Investment Agreement [Member] | Rockpoint [Member] | Minimum [Member] | ||||
| Preferred Units [Line Items] | ||||
| Incremental closing payments, Limited Partnership interest | $ 10.0 | |||
| Investment Agreement [Member] | Rockpoint [Member] | Maximum [Member] | ||||
| Preferred Units [Line Items] | ||||
| Contributed amount to obtain equity units | $ 300.0 |