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Debt - 2018 Financings (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) community | Aug. 31, 2017 community | Jul. 31, 2017 community | Dec. 31, 2018 USD ($) community loan_portfolio | Dec. 31, 2018 USD ($) community | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) community
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payments of debt restructuring |  |  |  |  | $ 11.7 | $ 12.4 |
Non-Recourse First Mortgages |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 307.4 |  | $ 78.9 |
Number of loan portfolios | loan_portfolio |  |  |  | 11 |  |  |
Repayment of debt |  |  |  | $ 171.4 |  |  |
Mortgages notes payable |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage bearing fixed interest | 60.00% | 60.00% | 70.00% | 65.00% | 65.00% |  |
Interest rate | 4.55% |  | 4.81% | 5.08% | 5.08% |  |
Percentage bearing variable interest | 40.00% | 40.00% | 30.00% | 35.00% | 35.00% |  |
Mortgages notes payable | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate basis | 1.89% | 2.415% | 2.44% | 2.16% |  |  |
Mortgages notes payable | Non-Recourse Supplemental Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount | $ 247.6 |  |  | $ 327.0 | $ 327.0 |  | $ 54.7
Number of communities securing debt | community |  |  |  |  |  |  | 7
Interest rate |  |  |  |  |  |  | 4.69%
Mortgages notes payable | Mortgage Debt Due May 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extinguishment of debt | $ 43.0 |  |  |  |  |  |
Mortgages notes payable | Mortgage Debt Due January 2019 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 60.4 |  |  |
Secured Debt | Non-Recourse First Mortgages |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of communities securing debt | community | 11 | 51 | 22 | 28 | 28 |  |
HCP, Inc. |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of communities acquired | community | 5 |  |  |  |  |  |

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