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Debt - 2017 Financings (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 15, 2018 USD ($) | Apr. 30, 2018 USD ($) community | Aug. 31, 2017 USD ($) community | Jul. 31, 2017 USD ($) community loan_portfolio | Dec. 31, 2018 USD ($) community | Dec. 31, 2018 USD ($) community | Dec. 31, 2017 USD ($) community | Jun. 30, 2017 USD ($) community | Jun. 30, 2011 USD ($)
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 communities securing mortgage notes | community |  |  |  |  |  |  | 13 |  |
First Mortgage Financing |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  | 4.55% |  | 4.81% | 5.08% | 5.08% |  |  |
Debt maturity period |  |  |  | 10 years |  |  |  |  |
Percentage bearing fixed interest |  | 60.00% | 60.00% | 70.00% | 65.00% | 65.00% |  |  |
Percentage bearing variable interest |  | 40.00% | 40.00% | 30.00% | 35.00% | 35.00% |  |  |
First Mortgage Financing | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate basis |  | 1.89% | 2.415% | 2.44% | 2.16% |  |  |  |
First Mortgage Financing | 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% |
First Mortgage Financing | Mortgage Debt Due April 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 188.1 |  |  |  |  |
First Mortgage Financing | Mortgage Debt Due January 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 13.6 |  |  |  |  |
First Mortgage Financing | Mortgage Debt Due August 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  | $ 389.9 |  |  |  |  |  |
First Mortgage Financing | Mortgage Debt Due May 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  | $ 228.9 |  |  |  |  |  |
Secured Debt | Non-Recourse First Mortgages |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Number of communities securing debt | community |  | 11 | 51 | 22 | 28 | 28 |  |  |
Number of debt instruments refinanced | loan_portfolio |  |  |  | 2 |  |  |  |  |
Proceeds from debt refinancing |  |  | $ 975.0 | $ 221.3 |  |  |  |  |
Convertible notes payable |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 316.3 |  |
Convertible notes payable | Convertible Senior Notes Due June 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 316.3
Interest rate |  |  |  |  |  |  |  |  | 2.75%
Extinguishment of debt | $ 316.3 |  |  |  |  |  |  |  |
One Half Principal, Maturing in 2024 | First Mortgage Financing |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  | 4.43% |  |  |  |  |  |
One Half Principal, Maturing in 2027 | First Mortgage Financing |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  | 4.47% |  |  |  |  |  |

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