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Business - Joint Venture Transactions (Details) $ in Millions |  | 9 Months Ended
--- | --- | ---
Nov. 01, 2017 USD ($) property agreement | Sep. 30, 2017
RIDEA I |  |
Variable Interest Entity [Line Items] |  |
Ownership percentage (as a percent) |  | 90.00%
RIDEA III |  |
Variable Interest Entity [Line Items] |  |
Ownership percentage (as a percent) |  | 90.00%
CCRC JV | SHOP |  |
Variable Interest Entity [Line Items] |  |
Investment ownership percentage |  | 49.00%
Master Lease Transactions | Affiliated Entity | Subsequent Event | RIDEA I |  |
Variable Interest Entity [Line Items] |  |
Percentage of interest acquired | 10.00% |
Master Lease Transactions | Affiliated Entity | Subsequent Event | RIDEA III |  |
Variable Interest Entity [Line Items] |  |
Percentage of interest acquired | 10.00% |
Master Lease Transactions | Affiliated Entity | Assets Leased to Others | RIDEA Facilities | Subsequent Event |  |
Variable Interest Entity [Line Items] |  |
Number of properties | 58 |
Number of assets under management agreement | 2 |
Master Lease Transactions | Affiliated Entity | SHOP | Assets Leased to Others | RIDEA Facilities | Subsequent Event |  |
Variable Interest Entity [Line Items] |  |
Number of properties | 36 |
Base management fee, percentage of gross revenue | 5.00% |
Percentage of annual increase in management fee | 1.00% |
Management fee annual rent increase period | 2 years |
Number of assets to be sold | 4 |
Total consideration for disposition of real estate | $ | $ 239 |
Number of assets under management agreement | 18 |
Number of management agreement with termination rights | agreement | 7 |
Management agreements with termination rights period | 10 years |
Master Lease Transactions | Affiliated Entity | Maximum | SHOP | Assets Leased to Others | RIDEA Facilities | Subsequent Event |  |
Variable Interest Entity [Line Items] |  |
Base management fee, percentage of gross revenue | 7.00% |
Master Lease Transactions | Affiliated Entity | CCRC JV | SHOP |  |
Variable Interest Entity [Line Items] |  |
Investment ownership percentage |  | 49.00%
Ownership interest held by Parent |  | 51.00%

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