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Acquisitions, Dispositions and Other Significant Transactions - 2017 HCP Master Lease Transaction (Details) $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 01, 2018 community | Jan. 01, 2018 USD ($) community | Nov. 02, 2017 USD ($) community joint_venture | Dec. 31, 2017 USD ($) joint_venture | Dec. 31, 2017 joint_venture
RIDEA Ventures |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership Percentage |  |  |  | 10.00% | 10.00%
Number of joint ventures | joint_venture |  |  |  |  | 2
Master Lease Transactions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total communities disposed of |  |  | 35 |  |
RIDEA Ventures Restructuring |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of communities acquired |  |  | 4 |  |
Payments to acquire joint ventures | $ |  |  | $ 239.5 |  |
Number of communities management is retained |  |  | 18 |  |
RIDEA Ventures Restructuring | 37 Communities Disposed Of Through Management Termination |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of communities disposed of |  |  | 37 |  |
RIDEA Ventures Restructuring | RIDEA Ventures |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership Percentage |  |  | 10.00% |  |
Number of joint ventures | joint_venture |  |  | 2 | 2 |
Proceeds from sale of joint venture interest | $ |  |  | $ 94.7 |  |
Number of communities managed |  |  | 59 |  |
HCP, Inc. | Master Lease Transactions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of communities acquired |  |  | 2 |  |
Payments to acquire joint ventures | $ |  |  | $ 35.4 |  |
Number of communities leased |  |  | 43 |  |
HCP, Inc. | RIDEA Ventures Restructuring | RIDEA Ventures |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of joint ventures | joint_venture |  |  |  | 1 |
Proceeds from sale of joint venture interest | $ |  |  |  | $ 32.1 |
Forecast | Master Lease Transactions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of communities disposed of | 33 |  |  |  |
Subsequent event | Master Lease Transactions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Annual rent reduction | $ |  | $ 2.5 |  |  |
Number of communities with rent reduction |  | 2 |  |  |

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